EAPS 10400 Lecture Notes - Lecture 7: James Croll, Longwave, Ocean Acidification

• School: Purdue University
• Department: Earth Atmospheric and Planetary Sciences
• Course: EAPS 10400
• Professor: Greg Michalski

Document Summary

Lecture 7 notes- global warming: greenhouse effect, measures rate of change, greenhouse gases in the atmosphere are driving global warming, baseline period- average global temperature 1951-1980, since 1970s steady global rise in temperature (increasing temp) +0. 6 c: carbon dioxide, major role in rising temperatures, shortwave radiation- visible light. 30: the sour(cid:272)e of i(cid:374)(cid:272)reased co(cid:1006) i(cid:374) us (cid:272)o(cid:373)(cid:271)ustio(cid:374) of fossil fuels, power cars, heat our homes, etc. All the above: absorbs infrared radiation, contributes 2/3 of the greenhouse effect, acts as a positive feedback when warming occurs: 4% more water vapor than in 1970. Important greenhouse gases: methane- greenhouse gas produced by decomposition of organic matter in the absence of oxygen, growing rice, from livestock. Lots of fossil fuels from human beings and deforestation. Alter global climate for 1-2 years: sunspots- dark cooler spots on su(cid:374)"s surface that are typically surrounded by hotter and brighter spots (cid:272)alled (cid:862)aureoles(cid:863, sunspot cycle, high- insolation, 11 year cycles.