CAS ES 351 Chapter Notes - Chapter 13: Ice Rafting, Last Glacial Maximum, Jet Stream
26 Apr 2019
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Document Summary
The last glacial maximum was how it was because of lower co2, larger ice sheets, and changes in seasonal insolation. Summer and winter insolation levels were the same 21,000 years ago as they were today but the ice was so large because it was lagging the lower summer insolation from thousands of years earlier. Because seasonal insolation was the same as today, the only thing to explain the conditions were larger ice sheets and lower greenhouse gases. Climap: climate mapping and prediction project reconstructed the surface of earth at the. ~this recreated world was almost 4 degrees colder than today. ~sea ice was more extensive in this model. ~low latitude ocean temps were only slightly colder than they are today. ~the main reason for uncertainty in ice limits was the scarcity of organic carbon in the cold dry arctic. ~this estimated ice sheets to be very large and thick. ~ice sheets were also very high (split jet streams)
