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Flashcards in Unit 7 (Kognity Only) Deck (174):
1

Mitigation

A human intervention to reduce sources or enhance the sinks of greenhouse gasses. It involves anthropocentric intervention reducing the forcing of the climate system

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Geo-engineering

Carbon dioxide being removed from the atmosphere

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Reducing energy use

Reducing consumption and therefore fossil fuels can reduce emissions. eg: hybrid and electric vehicles

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Substitute fossil fuels which can provide for transport include:

Biodiesel (made from rapeseed, palm, or sunflower oil), Bioethanol (Made from crops being fermented to produce it, EG: sugar can, maize, or sorghum) - in brazil, bioethanol from sugar cane is used as fuel for vehicles, and car companies have developed 100% ethanol engines

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Issues with growing biofuels

Cost of land and reduction of land to supply food which increases food cost, production of them can potentially cause pollution from the use of fertilisers and pesticides and compete for limited water resources. The cultivation of biofuels may require clearance of natural vegetation, destruction of ecosystems and loss of biodiversity

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Best management practices to reduce GHG emissions from farming

Use less fertiliser, adding nitrification inhibitors to the fertiliser to reduce production of nitrous oxide, recude methane generation from livestock, collecting and utilising methane emissions from biodegradation of animal waste as a source of energy, cultivating rice varieties

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Using fertiliser can reduce....

Nitrous oxide (N2O) emissions. Fertilisers should only be applied when required and when there is maximum uptake. Or when there is low risk of run-off in dryer conditions

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Reducing methane generation from livestock by:

Selective breeding to have cattle produce less methane, or changing the feedstock

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Cultivating rice varieties can apply when

The rice can be grown in drier conditions with higher yields which will reduce methane emissions

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Geo-engineering

manipulating the earth’s environmental systems to counteract impacts of climate change

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Geo-engineering methods do not address

The causes of climate change, but could be used to complement GHG emission reduction strategies. Little is known about their effectiveness since most have not been tested

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Two key approaches to geo-engineering

Carbon dioxide removal from the atmosphere, solar radiation management

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Carbon dioxide removal methods

Carbon capture and storage, ocean absorption, Use of biomass, UN-REDD, land use management

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Carbon dioxide removal (CDR)

Methods are unproven and it is likely to be a slow process taking decades to stabilise atmospheric levels

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Land use management

Used to protect and enhance plants that absorb CD, reducing atmospheric levels.

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Carbon sinks can be protected and enhanced by

Afforestation of land, restoration such as reforestation of degraded land, reduced deforestation, use of farming practices which encourages retention of carbon stores within the soil as organic matter.

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No tillage is recommended because

Tillage disturbs the soil, increases erosion and loss of organic matter

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UN-REDD

A collaborative programme to reduce emissions from deforestation and forest degradation set up by the UN in 2008. It recognises the economic value of forests as carbon since, and the potential of indigenous people to effectively manage the forest

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The UN-REDD supports developing countries to:

Reduce GHG emissions from forests, invest in low carbon energy sources

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Use of biomass

When plant organisms die, the biomass degrades releasing carbon dioxide. An alternative is to harvest and use the biomass to generate fuel (replacing fossil fuels) or to bury the material

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Carbon capture and storage (CCS)

Removes carbon dioxide from the atmosphere either chemically to form carbonates or by compression and transport to a site of permanent storage. They are likely to be expensive and are under investigation

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Carbon capture and storage approach techniques

Aire could be filtered through absorbent material that removes the CD. Storage could be underground sites such as geological foundations that previously contained oil or gas reservoirs

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Ocean absorption

CD is absorbed by photosynthetic phytoplankton in the ocean. Then the carbon moves through the food web and when organisms die they sink to the lower layers. Then they enter storage within the sediments. This absorption of carbon dioxide from the atmosphere and its movement into deep ocean is known as the biological pump

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The biological pump could be further enhanced by:

Fertilising the oceans with nitrates, phosphates, and iron, to encourage photosynthesis by phytoplankton. Or, increasing upwellings eg: using mechanical pumps to move cold nutrient rich waters from lower lawyers to the surface, encouraging photosynthesis and enhancing CD uptake. Consequences are unknown

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Solar radiation management (SRM)

Theoretical and focus on increasing the reflection of sunlight back into space, reducing total solar radiation absorbed by the earth

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Examples of increasing reflection from the earth’s surface

Painting rooftops with white reflective paint, growing plants with high reflectivity (Genetically engineered crops/grasses with high albedo), covering areas with reflective material (covering deserts with reflective plastic sheets

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Other options for solar radiation management (SRM)

Use solar deflectors in space, enhance the reflectivity of clouds by increasing particles that attract water molecules, use aerosols to increase the albedo effect (however the effect and impact on the stratospheric ozone are unknown for this)

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International collaboration

Vital for effective mitigation and adaption globally. However compliance to international agreements relies on good will and self-policing. Regional and national legislation are often more effective with clear monitoring and enforcement

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International Panel on Climate Change (IPCC)

Set up by the United Nations environmental programme (UNEP) and World meteorological organisation (WMO) in 1988.

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The aim of the IPPC

Provide a scientific view of the current knowledge and understanding of CC and its impacts. It involves sciences and governments from across the world, hence their work has wide ownership to help influence national policies

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United Nations framework convention on climate change (UNFCCC)

Signed by 154 Nations during the earth summit in Rio in 1992. It came into force in 1994 with the aim of stabilising atmospheric gas levels, providing a framework for protocol agreements. Parties meet each year to discuss process and set targets.

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Kyoto meeting of the UNFCCC

Took place in 1997 and led to the Kyoto protocol which set targets on GHG emissions coming into force in 2005

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Kyoto Protocol 2005 targets:

Overall global reduction of about 5% of CD emissions of 1990 levels by 2012. Individual targets for each country by 2012

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Pros of Kyoto Protocol

Sets targets to reduce GHG which causes global warming and CC, provides forums to share data and practices, counties can opt to reduce GHG emissions in other countries (where it may be cheaper) and reduce overall levels, established the adaption fund that financially supports vulnerable communities in developing countries with adaption, Nations can use cap/trade, emission trading to buy and sell

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Cons of Kyoto Protocol

Goals for 2012 were not met, viewed by some nations as reducing rate of industrial development and economic growth by increasing production cost, developing countries who are large emitters were excluded (China, India), some organisations argue that ar gets were not stringent enough to reduce risk of CC, not all countries ratified any of the protocols and did not need to cut emissions, decisions require consensus

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National adaption programs of action (NAPA)

The UNFCCC requires LEDCs to produce a NAPA highlighting areas most vulnerable to CC and where adaption is most required. Selected projects are financially assisted

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Political commitment to take action and reduce levels driven by

Public opinion of the environment and understanding of climate change, effect on industrial and economic growth, dependence on income from export of fossil fuels, politicians

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Environmental lobby groups

Raise environmental awareness through public awareness campaigns and mobilise the public to influence governmental decisions.

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Advocates of fossil fuels

May petition politicians with their perspective to avaoid change

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The cost of abatement

Could reduce growth rates

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Politicians

Keen to be viewed favourable to win another term in office and usually favour decisions with short term benefits.

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Tackling climate issues requires

Action over long term which means that benefits can be difficult to measure

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Adoption of mitigation and adaption strategies can be impended by:

Insufficient knowledge of impacts, poor integration into policy and planning at national to local level, poor communication, limited regulation and accountability, inertia and procrastination, insufficient funds and technology, political instability

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Poor communication and sharing of information results in

Governmental departments working in isolation from each other on a common project (Eg: essential infrastructure improvements involving energy, water, and transport)

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The impacts of climate change are

Not evenly distributed

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Some of the most vulnerable countries

Have the least resources which makes adaption difficult (EG: Bangladesh is a low lying coastal area)

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Strategies to overcome the barriers to mitigation and adaption

Sharing knowledge, education/public awareness campaigns, efficient communication, consideration of mitigation and adaption as complementary, governments, businesses, and communities to work together and support action, setting achievable and timely goals, sufficient financials, access to technology and expertise

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Commitment at all levels

Mitigation and adaption strategies need to be fully embedded into the political and economic decision making processes from national to local levels

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The capacity to take on climate change action

Varies from country to country and is limited in developing countries by access to the required funds, technology, and expertise meaning wealthier countries need to help poorer countries with support to deal with climate change

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Adaption (IPCC definition)

The process of adjustment to actual or expected climate and its effects

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Natural systems (Adaption)

Human intervention may facilitate adjustment to expected climate and its effects

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Human systems (Adaption)

Seeks to moderate or avoid harm or exploit beneficial opportunities

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Mitigation and adaption contrast

Mitigation addresses the causes of climate change by reducing emissions of GHG, adaption is focused on dealing with their effects

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Adaption strategies are necessary to

Minimise negative effects and take advantage of any new favourable conditions

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The long residence period of GHGs in the atmosphere mean

That even if GHG emissions were dramatically cut, past emissions will continue to influence climate

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Differences between mitigation and adaption

Effects of mitigation can be seen on a global scale with adaption being at a local level. Success of mitigation is easy to mesure whearas success of adaption is more complex

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Measuring mitigation

Through reduced levels of atmospheric GHG

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Through effective adaptation

We can develop the resilience of our infrastructure and built environment to climate change.

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Regulation

Used to implement adaption and to have contingency plans for extreme events. Early warning systems give local people time to prepare (EG: cyclone, evacuate and find shelter)

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Adaption mesures are categorised

Based on sectors

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Sectors of adaption

Water resources, agriculture and fisheries, Ecosystems, coastal/low lying areas, health, weather, migration

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Weather

Seed clouds to encourage rainfall, plant trees to encourage more rainfall

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Water resources

Reduce demand with conservation strategies, improve water supplies through the use of desalinisation plants, increase reservoirs, harvest run-off more effectively

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Flood risk

Plan water catchment and run-off to minimise flooding, ban building on river flood plains or in areas prone to flooding, modify infrastructure and buildings such as adapting sewage to prevent overflow or building with garages or on stilts, use of flood barriers to drain or diverts water, SUDs (sustainable urban draining) in planning regulations

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Agriculture

Using cops that reflect changing conditions, change to crops with high yield, alter time of planting and harvesting to match change in conditions, employ water conservation techniques to maximise use of limited water (micro-irrigation), increase retention of soil moisture reducing erosion via use of terracing and wind breaks, store rainwater, breed drought tolerant crops

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Crops that reflect changing conditions

Salt resistant, flood resistant, pest resistant, need less water, grow at higher temperatures

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Fisheries

Reduce collapse of fish stocks by reducing intensity, reducing catches, and making fishermen seek employment in other areas

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Ecosystems

Adjust to biome shifts by expanding conservation towards the poles, develop forest fire management (wind breaks to prevent spreading), connecting protected areas with corridors allowing movement of species adapting to changes, protect vulnerable zones like coral reeds and mangroves including pollution and over exploitation prevention

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It has been predicted the the Carteret Islands off Papua New Guinea

Will be submerged by 2020, making residents relocate to other areas

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Health

Improve public health programs, vaccinate against waterborne disease (Typhoid), vaccinate for other diseases such as cholera and polio, be prepared for treatment of likely injuries from climate events, mother and surveillance that raises an alarm at increased risk of health issues

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Coastal systems and low lying areas

Improve management of rising sea level and storm surges , ban on developments in LLA, contingency planning for humans, Building and re-enforcing sea wall and coastal defences, move dangerous facilities way from LLA eg: nuclear power stations, managed retreat which may involve compensation and relocation of residents

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Sea walls and coastal defences

Groynes and beach replenishment programs which dissipate energy and impact of incoming waves

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Water vapour, positive feedback

Higher surface temperature - increased evaporation from oceans and surface waters - more water vapour - enhanced green house effect (if temperatures rise, more water evaporates)

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Water is a

Green house gas, meaning it increases temperature

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Ice albedo

Ice and snow have a reflective surface meaning they have a high albedo. If temperatures increase, they melt, reducing the amount of solar radiation reflected back into space

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Dark surfaces

Replace ice and snow and increase absorption of sunlight and contribute to global warming. Higher temperatures result in more ice and snow melting

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Methane

GHG

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Permafrost

Increase in temperature results in melting of permafrost which releases methane

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Carbon dioxide solubility

If temperatures increase, the solubility of carbon dioxide i the oceans decrease. The release of CD into the atmosphere results in further warming

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Plant photosynthesis (Negative feedback)

If temperatures increase the levels of plant photosynthesis rise with more CD absorbed. This reduction in atmospheric levels results in global temperature reduction

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Cloud cover leads to

Positive or negative feedback depending on the temperature (altitude) and optical properties (particle size, solid or liquid)

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Cloud cover negative feedback

Dominates in low clouds that reflect some of the incoming solar radiation back into space increasing heat loss and causing global cooling

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Cloud cover positive feedback

Dominates in high cloud cover that acts as a blanket retaining heat radiated from the earth’s surface, increasing the temperature

84

Fossil Fuels are formed from

Dead plants and animals under pressure over millions of years. They provide a finite source of energy and if use continues they will eventually become exhausted

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Advantages of fossil fuels

High energy content, currently relatively abundant, relatively cheap, infrastructure is set up for its use in most countries (eg: road and rail links and connection to the electricity grid)

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Disadvantages of fossil fuels

Finite (not sustainable), extraction destroys habitats and reduces biodiversity in certain areas, combustion of FFs produces GHG, Transport FFs product emissions of CD, NOx, SO2, and particulates, Power plants require large supplies of water which reduces other uses and impacts aquatic ecosystems, discharge of waste water can result in thermal pollution of aquatic ecosystems

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Coal is....

A hard solid that contains carbon, hydrogen, nitrogen, and sulphur compounds. It is the most abundant fossil fuel

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Coal is obtained from...

Deep mines or open mines

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Limitations of mining

Hazardous to human heath (exposure to coal dust leading to bronchitis and “black lung disease”), a dangerous occupation with thousands of deaths each year, contaminates aquatic systems with toxic metals (acid mine drainage), burning of coal produces ask containing metal oxides and alkali requiring disposal

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Locations where Coal is found

The largest reserves are in China, USA, Russia, and India. With China, USA, and India being that top producers

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Oil locations

Largest reserves are in Saudi, Venezuela, Canada, Iran, and Alaska. The top producers include Saudi, Russia, and the US

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Oil refineries seperate oil into different products that include:

Residue containing bitumen used in road building, fuel oil for ships and power stations, diesel for cars and lorries, kerosene used by aircrafts, gasoline for cars, various chemicals and plastics and fertilisers

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Oil limitations

Waste from the refinery process includes slurry containing metals and toxic compounds, offshore extraction resulted in the Gulf of Mexico spill, drilling can pollute underground aquifers, transport through tanker ships, pipes, trucks, and rain can result in spills accidentally affecting marine life.

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Oil usually...

Is pumped from underground reservoirs

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Positive of oil

Produces less emissions of CD, NOx, SO2 and particulates than burning coal but significantly more than natural gas

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Natural gas

Comprised of mostly methane but also ethane, butane, propane, and pentane. It has lower nitrogen and sulphur content than oil or coal resulting in less harmful emissions (producing less CD, NOx, and SO2 and particulates than other fossil fuels.)

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Largest reserves of natural gas

Russia, Iran, Qatar, and Turkmenistan. Top producers being US, Russia, and Iran

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Fracking

Has been expanded to obtain shale gas (in the US this contributes to a third of gas production). Fracking can potentially contaminate groundwater, pollute surface waters with waste products, contribute to seismic activity

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Disadvantage of natural gas

Leaks can be difficult to detect because the natural gas is odourless, colourless, and tasteless. Therefore, hydrogen sulphide is often added to aid leak detection

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Nuclear power plants are concentrated in

North America, europe and parts of Asia

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In France (Nuclear Power)

75% of electricity is generated from Nuclear Power

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Uranium is mines in

Kazakhstan, Canada, Australia, Namibia, and the US

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Nuclear power generation

The ore is processed and purified prior to forming fuel used in a nuclear reactor. Neutrons start a chain reaction where energy is produced from the splitting of uranium atoms (nuclear fusion) Heat generated turns water into steam which is fed through a pipe to a stream turbine. The streams rotates blades within the turbine generating electricity

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Used nuclear fuel

Generates a lot of heat and contains highly radioactive material hence is usually stored in lead containers, immersed in cooling ponds

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Dispersal of radioactive materials is caused by

Chemical corrosion of the container, microbial action, geological change (EG: earthquake or volcanic activity), human activity (EG: terrorism), contamination of groundwater

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Radioactive waste management

RW is generated at all stages of the nuclear fuel cycle, the time to decay ranges from seconds to years. The main route of disposal by most countries is underground repositories

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Low level waste

Filtered and hen disposed of into the environment (EG: through atmospheric emissions or waste water discharge)

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Solid waste disposal

such as paper towels and gloves used on site are buried underground, other waste material is stored in lead covered stainless steel containers

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Nuclear power is sometimes referred to as....

A ‘clean’ energy source because it provides few emissions that contribute to GHGs, acid rain, or urban pollution

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Advocates for nuclear fuel (including technocentric) will argue that tech will

Provide a solution to the radioactive waste created, provide a replacement for Uranium as a fission material that produces less radioactive waste and is more abundant

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Advantages nuclear power

Do not produce CD emissions, reducing risk of climate change, causes less deaths compared to fossil fuels (EG: coal mining accidents, premature death related to pollution)

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Disadvantages of nuclear power

Generation of nuclear waste with high radioactive levels that will last for thousands of years, risk of nuclear accidents, potential use of radioactive material from power stations for nuclear weapons, high capital cost and decommissioning cost (when power plant is closed and dismantled)

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Renewable sources of energy

Hydropower, solar, biomass, geothermal, wave, tidal

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Advantages of renewable energy

Improvements to local air quality (less production of primary pollutants such as SO2 and NOx and secondary pollutants such as ozone), reduced GHG emissions (CO2), employment opportunities, improves energy security

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Factors to accelerate growth of renewable energy

Decline in fossil fuel reserves forcing prices up, techno developments improving efficiency of renewable energy and capital cost, governmental support through economic incentives (subsidies), increase awareness of environmental impact of using fossil fuels (CC), need to meet international targets (Reduce CD emissions)

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Solar power - the factors influencing the amount of solar radiation that reaches the planet surface include:

Tilting of the earth reflecting the season (EG: highest radiation occurs during the summer months), amount of clouds cover

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Two types of solar panels include

Solar thermal panels (heat water and buildings), Photovoltaic panels (converts sunlight to electricity)

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Solar thermal panels

Fitted onto the roof of buildings. Air can be warmed and then passed back into the building. Water can be heated then either stored until required (hot water) or stored to transmit its heat (eg: internal wall). The heat form water is released during the night to maintain room temperature

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Photovoltaic Panels

Efficiency ranges from 10-20%. Cost of production and installation is relatively high, although running costs are low. Manufacture of solar panels produce pollutants such as CD when setting up but no emissions when running, Panels called Heliostat can track the sun’s movement maximising electricity

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Advantages of solar power

Silent, can be used in remote areas, low running cost, sunlight is free, once operational does not produce particulates that contribute to urban air pollution, acid rain, or climate change

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Disdvantages of solar power

Needs sunlight which varies regionally and is weather dependent, relatively high capital cost, production of panels creates pollution, no electricity is produced at night meaning electricity produces Ned’s storing for when required

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Wind power

Wind turbines that produce electricity are called aero-generators, they usually have fewer blade than the traditional windmill, and therefore require stronger winds to get started. Int he northern hemisphere, higher energy demand during winter is matched by a greater number of windy days and higher wind speeds (UK for example)

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Ideal conditions for wind power (choosing where to cite them)

Top of hills here they could be considered to be visually intrusive and a blot on the landscape. Opponents also cite noice produced and interception of bird migratory routes.

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Advantages wind power

Renewable (inexhaustible), sustainable, large (abundant) supply available, can be used in remote areas, does not pollute, operational cost is low

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Disadvantages wind power

Wind dependent which varies from place to place and can be unpredictable, noise pollution, aesthetically displeasing, can kill birds/bats, high capital cost (manufacturing and installation), electricity needs storing until required

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Offshore wind power

Although wind farms can be sited offshore where winds are stronger, there are other concerns: visual impact on seascape, corrosion of the aero generation, aerogenerator vibration impact on sea life, disruption to shipping routes, reduced fishing grounds, potential impact on seabirds

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Hydropower producers

China, Brazil, and Canada. Paraguay generates most of its electricity from hydropower via the Itaipu and Yacyreta Dam shared with Brazil and Argentina

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Hydropower

The most renewable source of energy currently, energy obtained from the movement of water has historically been used to drive a variety of machinery from grinding flour to sawing wood. HEP is produced when flowing water drives turbines connected to a generator which converts mechanical into electrical energy

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HEP schemes

Associated with building reservoirs for water resources. The dam wall built to maintain water in the reservoir also raises the height of the water prior to reaching the turbines which increases the amount of power generated from the falling water.

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Hydropower advantages

Sustainable energy, low running cost contributes to economic development, dam construction increases water resources and reduces risk of downstream food, does not produce urban air pollutants, the reservoir can provide an ecosystem for fisheries and offer recreational activity (water sports)

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Hydropower disadvantages

High capital cost, Dam construction leads to displacement of peoples potential seismic activity, loss of habitat / species biodiversity, situation in the reservoir and loss of sediment downstream, disruption of migratory route for river organisms, decomposition of the biota flooded to create the reservoir can result in emissions of methane and CD

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Geothermal energy

Energy from the interior of the earth that sometimes leaks through faults and fractures to the surface of the earth. Groundwater heated by it can reach the earth’s surface as hot springs and geysers. It can heat buildings and generate electricity

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Enhanced geothermal systems

Created when holes are drilled into heated areas called ‘hot dry rock’ through which pressurised water is passed and collected as steam used to drive turbines that generate electricity

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Advantages geothermal energy

Cheap to operate, low emissions of carbon dioxide and other GHGs, reliable supply in some areas, sustainable energy supply

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Disadvantages geothermal energy

High capital cost (drilling can be expensive), poisonous gases from within the earth can be released (methane, hydrogen sulphide, ammonia, CD - but quantities are low compared to FF use), historically limited to areas near volcanic activity (boundary or tectonic plates)

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Energy security

“Uninterrupted availability of energy sources at an affordable price’ They are not distributed equally around the world with some regions having large fossil fuel deposits

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Fossil Fuel exporters

Saudi, Russia, Canada. Countries which produce surplus electricity such as Paraguay sell electricity from hydropower to Brazil and Argentina. Some countries rely on imports to meet their needs such as when consumption exceeds national production. This makes them vulnerable to political changes in the exporting nation

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Energy security depends on

Adequate supply of energy which matches demand, reliable supply not interrupted by conflict, affordable supply to ensure access to all

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A reduction in energy supply effects

Everyday activities, transport, industry, national economy

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Threats to energy security

Political instability / conflict in an exporting country, accidents or natural disasters, exhaustion of resource, risk of terror attacks on source or supply infrastructure

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Risk of threats to energy security can be reduced by

Reducing imports and becoming more self-sufficient in energy supply (diversifying sources of energy to find FF alternative, exploiting indigenous resources, reducing demand by increasing energy conservation measures), reducing reliance on one or two exporting countries and using more countries to spread the risk

142

Iceland facts

Aim of using renewable resources to become energy independent by 2050, electricity form heat and transport comes from renewables. 20% hydro, 66% geo (most homes heated by geo), investing in wind power, FFs are used for vehicles boats and sometimes industrial. They plan to replace imported FFs with hydrogen fuel cells

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Factors affecting energy choices

Availability, sustainability, scientific / technical development, cultural, political, economic, and environmental

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Energy availability

Depending on location. Topography (hillsides for wind, rivers for hydro), Geology (some countries have an abundance of fossil fuels or relatively easy access to geothermal power)

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Energy sustainability

Many countries are beginning to consider energy choices over long term and investing in renewables that will not run our like non renewable FFs

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Scientific and technological developments

Increasing the choices of affordable alternatives (eg: technology has decreased cost of photovoltaic panels), new options in the future

147

Cultural attitudes

Some communities have a more nature centred EVS and are more proactive in changing behaviour to reduce energy and polluting less

148

Politics

Some national governments have greater political will than others to improve long term energy security and make dramatic changes to policies that alter energy sources and individual lifestyles. Governments often make decisions that reflect changing values of the population they represent. International agreements may be responded to by governments (eg: emission targets)

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Economics

Energy sources need to be economically visible as they must be affordable to all to ensure full access. Economic weather of a country may limit the choice of energy sources

150

Environmental impact

There is a general drive by countries to reduce GHGs such as CD and move away from coal and oil to less pollutant resources such as wind and solar

151

In addition to sun emitted and the orientation of the earth, other factors affect our climate including

Atmospheric and ocean circulation systems, concentration of greenhouse gases, volcanic activity, feedback cycles

152

More radiation reaches

The equator than the polar regions. Therefore, temperature is higher in the equator and lowest at the pole. The energy from the equator is transferred towards the poles through atmospheric and ocean circulation systems

153

Ocean circulation systems are caused by

Winds and difference in water temperature and salinity

154

Wind occurs as a result of differences in air pressure

Low pressure occurs when air is warmed - it expands and rises forming clouds. High pressure is related when a reduction in temperature cools the air which contracts becoming denser and descends which results in clearer skies and calmer weather conditions. Movement of air from high to low air creates wind (Replacing rising air)

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Volcanic activity

Has a short term effect on climate. Emissions from volcanics include ash and gases such as sulphur dioxide. The latter reacts in the atmosphere forming a sulphate aerosol which reflects solar radiation into space causing global cooling

156

A rise in the concentration of GHGs in the atmosphere:

increases the amount of energy absorbed raising global temperatures. Evidence is found within direct temperature measurements and deep sea sediments and ice cores shaken from the Antarctic, Greenland, and mountain glaciers

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Climate

“Average” weather over the long term - often regionally

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Weather

Short term conditions (day to day) at a local level. Changes are often presented as statistics and trends can be used to predict future climate

159

Factors outside earth affecting climate

Solar radiation emission form the sun, tilting and orbit of the earth

160

Factors within the earth affecting climate

Atmospheric and ocean circulation systems, volcanic activity, feedback cycles, GHGs that trap heat and warm the land, oceans, and atmosphere

161

Solar radiation from the sun

Drives the earth’s climate and changes the amount of energy reaching the earth’s surface depending on energy emissions and position of the earth in relation. It has changed in the past with a cycle of 11 years with periods of low and high emission. This variation has a minimum impact on climate with no recent significant changes

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When the northern hemisphere tilts 23.5º north towards the sun

It absorbs more sunlight and energy resulting in summer season, The southern hemisphere is tilted away from the sun leading to winter there, with little light reaching the South Pole

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When the Southern Hemisphere is tilted 23.5º towards the sun

It is winter in the north making it dark in the North Pole until spring, Summer is resulted from more sunlight and solar energy

164

The earth’s eccentricity

The orbit of the earth around the sun is not circular, but is elliptical. The variation in the earth's eccentricity has a cycle of 100,000 years. Elliptical orbit means the distance of the earth from the sun varies through the year, with the closest point currently occurring in January. Nevertheless, there is little change in the amount of energy reaching the earth.

165

The Milankovitch cycle

The cycles of axial tilt, precession and eccentricity. They all influence the amount of sunlight reaching the earth. It contributes to the earth’s fluctuation between glacial (ice age) and interglacial periods

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Tipping point

The threshold at which a sudden and irreversible change occurs

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Climate change is expected to result in

Uneven rainfall with increased precipitation in high latitudes and decrease precipitation in mid/dry latitudes

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El Niño

The act if the climate in one part of the world can influencing climate in another via atmospheric and ocean circulation systems. El Niño events in the equatorial Pacific Ocean influence weather in North America and Europe.

169

El Niño events

Occur every 2-7 years and can last from a few months to more than a year

170

A change in water temperature and surface winds in the Eastern Pacific

Contributes to an increase in surface water temperatures, reduction in nutrients released from deep waters, adversely affecting primary production and fisheries.

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El Niño events develop when: (Water)

Warm surface water in the Western Pacific Ocean extends eastwards resulting in warmer temperature in the Eastern Pacific Ocean and lower pressure above South America. Rising moist air results in rainfall and flood risks in the region.

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El Niño events develop when: (Air)

Air flows from the WPO (high pressure, descending air) to the EPO (low pressure, rising air). West air mass is now drier East Asia and Australia experience less rainfall / risk of drought

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In the absence of El Niño: (Water)

In the WPO, high surface water temperatures cause evaporation resulting in development of low pressure. This leads to heavy rainfall over East Asia and parts of Australia.
In the EPO, upwellings bring cold deep waters to the surface, lowering surface water temperature resulting in high pressure.

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In the absence of El Niño: (Air)

Offshore winds from South America, (land to sea) contribute to dry weather conditions. The difference in atmospheric pressure between the West/East Pacific ocean results in air moving from East (high pressure, descending warm air) to West (low pressure, rising air)