lecture 12

Question 1

Sea Ice

Answer 1

Forms from cold sea water, (different from glaciers, ice sheets and icebergs which forms from accumulated snow)

Question 2

Why is sea ice important

Answer 2

Has a high albedo, Provides habitat, affects navigable waters and access to natural resources etc…

Question 3

Effects of salinity on freezing temp

Answer 3

Freezing temp of water decreases

Question 4

How sea ice is formed (types of ice)

Answer 4

Small ice crystals grow - Frazil ice(grease ice) -> small pancake ice -> medium pancake ice -> Large Pancake ice -> Pack ice

Question 5

What is brine

Answer 5

Salt in seawater is not incorporate in ice crystals so pockets of brine can be trapped in the ice

Question 6

First year sea ice

Answer 6

Formed over one winter then completely melts in summer, weaker, more brine so saltier

Question 7

Multi - year sea ice

Answer 7

Sea ice that lasted more than a year, stronger, less brine so fresher

Question 8

Compression ridges

Answer 8

Due to collisions between blocks of ice, keel below surface thicker than sail above

Question 9

Leads

Answer 9

Linear breaks in sea ice caused by stretching

Question 10

Polynas

Answer 10

Rounder areas of open water caused by winds, or melting of sea ice by warm water underneath

Question 11

Will there be more multi-year ice in the arctic or antarctic

Answer 11

Arctic