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Earth System- 29992 > Cryosphere 2- connections > Flashcards

Cryosphere 2- connections Flashcards

1
Q

how thick was the ice sheet over Scandinavia and UK?

A

Sacndinavia-2.5km
UK- 1km

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2
Q

What was the extent of the laurentide at the LGM?

A

Past Newyork and midwest towards the rockies

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3
Q

What does LGM stand for?

A

Last Glacial Maximum

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4
Q

Why hasnt japan even had glaciation?

A

even though bay water can freeze and receive 5m snow due to latitudinal position this is overcome in summer

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5
Q

Who was reposible for the first evidence of a quaternary ice sheets?

A

Louis Agassiz - perched boulders (erractics which couldnt have been placed by flood)

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6
Q

What is glacial erratic deposition?

A

Boulder plucked from bedrock or fall from nunatak which can very carried 10’s-100km’s and then deposited when glacier retreats

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7
Q

What is an erratic?

A

a rock that has been deposited in an area in which its own minerology doesn’t match the area of deposition

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8
Q

What is an example of erratics in birmingham?

A

Cotteridge park

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9
Q

What allowed the quaternary ice sheets to grow?

A

positive feedback from albedo

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10
Q

Where did the LGM stop?

A

Walsall/ Dudley

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11
Q

What is provenance?

A

the source/ origin of an erratic

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12
Q

What was the extent of the Devensian till sheet defined as by Powell 2000?

A

a line from north Dudley, through Walsall to Sutton Coldfield

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13
Q

What are the glacial depositional landforms?

A

Lateral, medial, terminal, ground, end and recessional moraines
Outwash
Drumlin

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14
Q

What are 2 examples of erosional and directional indicators of glaciation?

A

Striations
Gauges

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15
Q

What are striations?

A

scratch marks on the rock surface formed by fine grain material scraping surface.

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16
Q

What are gauges?

A

when large cobble size material is pressed onto rock with great pressure this shatters bedrock

17
Q

What is isostatic depression?

A

when overlying weight of ice causes rock to dip down

18
Q

What is isostatic rebound?

A

when ice retreats the ground will slowly start to rise again

19
Q

Where is a present day example of isostatic rebound?

A

James Bay Canada

20
Q

Why might relative sea level next to ice sheets be higher?

A

ice sheets are so big they can have their own gravitational pulling up the surrounding ocean

21
Q

What will variations in O18 be like on 41Ka cycle and 100ka?

A

frequent fluctuations for 41
large peak and trough 100ka

22
Q

How did co2 ppm over last 5 million years due to sediment cores?

A

330-400ppm to 270-280ppm

23
Q

What has happened to glacial severity over last 0.7Ma?

A

have become more severe

24
Q

How do the Milankovitch cycles interact with each other?

A

100ka super cycle with 41 and 23ka cycles nested in between

25
Q

How long was the quaternary?

A

2.6million years

Earth System- 29992 (24 decks)

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