Discuss and compare the physical drivers of sea level rise under anthropogenic climate change? Ho...
Discuss and compare the physical drivers of sea level rise under anthropogenic climate change? How do the timescales differ between each process you have identified? How do these processes compare to those occurring over geological time scales?
Homework Answers
Answer 1. There are two main physical reasons for the sea level rise:
1. Thermal expansion of sea water due to warming of sea water.
2. Melting of polar ice caps.
The heating in both the cases is induced by the Greenhouse effect which causes a global rise in temperature.
Answer 2. Satellite altimetry data and tide gauge had analysed that in the previous century around 1/3rd of the sea level rose due to thermal expansion and 2/3rd rose due to contribution by ice. The data for changes in sea level for both the physical factors is collectively analysed because the addition of water is variable at different places due to these factors.
Answer 3. In the past there has been considerable warming than today. This has caused more rise in sea level than what earth is witnessing today.
In mid pliocene global mean sea level was around 10-30 m higher than today
Sea level during last interglacial period (~125000 yr ago) was around 6-9 m higher than today.
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Discuss and compare the physical drivers of sea level rise under anthropogenic climate change? Ho...
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