Lecture 25

Question 1

How do we measure sea level

Answer 1

satellite radar(measured relative to center of earth)
Tide gauges(measure relative to local land surface

Question 2

Isostatic(local) sea level varies because

Answer 2

movement of land surface, atmospheric pressure, ocean currents and temp

Question 3

Eustatic(global) sea level varies due to

Answer 3

Change in volume of ocean water, change in volume of ocean basins due to plate tectonics

Question 4

Isostatic sea level change from ground water withdrawal

Answer 4

Removing water causes rock/sediment to compact and subside

Question 5

Factors affecting ice sheets and shelves

Answer 5

Greenland affected by increasing air and ocean temperatures

Antarctica mainly affected by increasing ocean temperatures