GSC 110 Lecture Notes - Lecture 31: Cesare Emiliani, Ice Core, Foraminifera
2 Jan 2020
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Lecture 31: climate & sea level change ii. Impacts growth of continental ice sheets, ice gets lighter having more o-16, ocean gets heavier having more o-18. O-18 in ice: cooler temperature would decrease amount of heavy oxygen that reaches land (less. O-18 in ice: general cooling trend last 100k years. Speleothems: analyze o & c isotopes & trace element differences, thinner/thicker bands. 30 my ago: last 40-50 my have been cooling, last 1 my and to now went back and forth, last big glacial period was wisconsin glaciation (before that, illinoian) "greenland: from 1300-mid 1800s, climate in northern hemisphere was colder than present, known as the little ice age, many issues of stress, disease, famine. Synopsis of the current climate regime: earth"s climate is variable, currently we are in an interglacial cycle (during an ice house) when temperatures are abnormally warmer than quaternary (2 my) average.
