Lecture 14 Flashcards Preview

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Flashcards in Lecture 14 Deck (19):
1

What is a cryosphere?

Frozen ground, glacier, snow, sea ice, ice sheets, permafrost

2

What four aspects of the cryosphere impact climate change?

High surface reflectivity (albedo)
All three phases of water exist here
High latent heat exchange
Ocean circulation controls

3

What two factors does thermohaline circulation take into account?

Temperature and salt

4

What does the term eustatic refer to?

Volume of water

5

What is the steric effect?

Temperature volume

6

What gets released when permafrost melts?

Greenhouse gasses are released

7

Give an example of a positive feedback loop

Melting sea ice -> lower albedo -> warming water ->

8

What are paraglacial environments?

Cold environments where freeze thaw processes dominate

9

True or false:
50% of the earths surface is considered paraglacial

False, 25% of the earths surface is

10

What is permafrost?

Perennially frozen ground (year round) and it does not require water

11

What is the active layer?

The top layer of permafrost that melts seasonally

12

What is cryoturbation?

The freeze thaw mixing of soil.

13

What are the three types of permafrost distribution?

Continuous
Discontinuous
Sporadic

14

What are the four main paraglacial processes?

Ground ice
Frost action
Thermokarst
Mass wasting

15

What are ice wedges?

Ice growth in an active layer due to ground expansion seasonally. These form polygons on the surface

16

What is a pingo?

A large conical mound with a frozen core, typically there is exposed ice at the top that gets melted and forms a crater. This forms over a talik

17

What is patterned ground a result of?

Frost

18

What is a feature of termokarst?

Thaw lakes

19

What does periglacial mean?

A cold environment adjusting to modern post-glacial climate and geomorphic processes