Climate Change [GHGs; CO2 Concentration]
1. Are glacial cycles are ultimately paced by astronomical forcing?
2. Role of CO2 in glacial cycles: Were the concentrations of GHGs were both increasing as well as decreasing over the last glacial cycle?
3. Whether CO2 remained to be the primary driver of the ice-ages?
4. Whether CO2 remains to be largely a consequence rather than cause of past climate change?
5. Whether climate models have also predicted the dominant contribution of GHGs (apart from ice albedo) to ice-age cooling?
6. Whether global temperature closely tracked the enhancement in CO2 concentration over the last deglaciation? CO2 did not initiate deglacial warming?
Suresh Kumar Govindarajan
Professor (HAG) IIT Madras
https://home.iitm.ac.in/gskumar/
https://iitm.irins.org/profile/61643
27-July-2024
It is difficult to conclude only one statement whether CO2 is consequence or cause as it maybe both.
Glacial cycles are mainly driven by Milankovitch cycles. during the last glacial cycle, CO2 levels fluctuaed, decreasing in glacial periods and increasing during interglacial periods. While CO2 significantly influenced temperature changes, it was not the primary driver of ice ages. Instead, it interacted with astronomical forcing and other factors, such as ice albedo. climate models indicate that GHG alongside ice albedo were crucial in ice-age cooling. During the last deglaciationglobal temperatures closely followed CO2 levels, but CO2 did not initiate the warming it amplified changes driven by other factors.
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