Biology 2485B Lecture Notes - Lecture 11: Milankovitch Cycles, Dome C, Ice Core
11 Apr 2018
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Document Summary
Reading-reading history in the world"s longest ice core (p. 430-431: snow fall compresses into ice sheets ice sheets trap air bubbles, dust particles can mine to see clues for climate history. Ice at the bottom of the core is the oldest. Ratio is temperature dependent: air bubbles researchers can quantify atmospheric concentrations of co2, methane, nitrous oxide, findings: Temperature is correlated with co2 concentrations and nitrous oxide. Temperature varies with swings in solar radiation (caused by milankovitch cycles) When greenhouse gases concentrations are high temperature concentrations is high (vise versa: need to bring ghg emissions down, toda(cid:455)"s (cid:272)o2, (cid:373)etha(cid:374)e, (cid:374)itrous o(cid:454)ide (cid:272)o(cid:374)(cid:272)e(cid:374)trations in atmosphere are higher than ever been. Atmospheric concentrations of co2 & methane rise and fall in tight correlation with temperature. Variation in tilt & variation in orbit. If you were to combine precession+ obliquity+ eccentricity= solar forcing. If you see higher solar forcing see gradual increase in temp.
