Lecture 14

Question 1

How do we measure sea ice extent(Direct measurement)

Answer 1

By people or remote instruments, e.g. buoys, only get measurements in a few places at a time

Question 2

How do we measure sea ice extent(Submarines)

Answer 2

Submarines have used sound waves to measure thickness under the ice in the arctic

Question 3

How do we measure sea ice extent(satelites)

Answer 3

Using passive microwaves

Question 4

How do we measure sea ice extent(satelites)

Answer 4

Radio waves can measure sea ice volume, measures changes in height compared to ocean water

Question 5

Seasonal cycle in sea ice extent(how does the graph of Sea ice extent(y) look with months(x)

Answer 5

Antarctic - decreases in winter months, then increases toward spring/summer
Arctic - Increases in winter months and decreases toward spring/summer

Question 6

How is sea ice extent changing over time in antarctic and arctic

Answer 6

Antarctic(southern hemisphere) - increasing, arctic - decreasing

Question 7

Does melting sea ice contribute to sea level rise

Answer 7

No it is already in the water