Human impacts on the atmosphere Flashcards Preview

ENVS2- the atmosphere > Human impacts on the atmosphere > Flashcards

Flashcards in Human impacts on the atmosphere Deck (16):
1

Greenhouse gas effect

Longwave Infrared radiation is absorbed by greenhouse gases
Natural effect

2

Enhanced greenhouse gas effect

Human activities releasing lots of extra greenhouse gases making the earth too warm.
Some greenhouse gases are only released via human activities

3

Greenhouse gases

Carbon dioxide
Methane
Nitrous oxides
Chlorofluorocarbons (CFCs)
Tropospheric ozone

4

Carbon dioxide

Deforestation
Incomplete combustion of fossil fuels in car engines

5

Methane

Anaerobic respiration by in paddy fields, landfill sites, livestock intestines
Leaks in natural gas pockets, gas pipes
Coal mine ventilation

6

Nitrous oxides

chemical reactions occur at high temperatures in engines and power stations and are released into the air

7

CFCs

Aerosol propellants
Fire extinguishers
Refrigerants
Solvents
Expanded foam plastics

8

photochemical breakdown of O2 and resulting reaction with monoatomic oxygen

Tropospheric ozone

9

Consequences of global climate change

Sea level rise
Changed wind patterns
Changed precipitation patterns
Ocean current changes
Ecological changes

10

Sea level rise

Thermal expansion-slower process
Melting land ice- faster process, will dilute salinity and remove habitats
Melting sea ice- no effect as its already in the sea

11

Wind patterns

Stronger
More volatile

12

Precipitation patterns

Increased precipitation rates
Presently cooler areas get less rain
Presently dry areas get more rain

13

Ocean current changes

El Nino
La Nina
North Atlantic conveyor

14

El nino

Stronger
More frequent

15

Normal currents exaggerated, exaggerating the natural climate.
Australia gets flooded while North America gets drought

La nina

16

Reversal of the normal ocean currents.
South America doesn't get the usual algae blooms, so the food web collapses.

El nino