Lecture 16: Natural Forces of Climate Change
Lecture 16: Natural Forces of Climate Change GC 170A
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This 2 page Class Notes was uploaded by Gigi on Thursday October 29, 2015. The Class Notes belongs to GC 170A at University of Arizona taught by E. Bigio in Fall 2015. Since its upload, it has received 31 views. For similar materials see INTRO TO GLOBAL CHANGE in Global Studies at University of Arizona.
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Date Created: 10/29/15
Lecture 16 Natural Causes of Climate Change Thursday October 29 2015 11E1E time of growth castles built 9001300 AD Warmer Evidence from northern Europe such as Vikings settled in Greenland for 400 years and archaeologists dig up the remains In the southwest droughts amp low stream ow in CO river Native Americans dispersed since droughts made it difficult to sustain large communities LinielceAge cooler temperatures glacial advances 14001800 AD Holland had more continuous frozen ice Ice ages are related to changes in earthsun distance in uenced by a combo of reduced sunspot activity amp increased volcanic activity Natural in uences on past climate changes 0 Volcanic Eruptions 0 Changes in solar radiation striking the earth 0 Changes in the earthsun distance 0 Sunspots M l E Can inject large amounts of ash into the atmosphere Large explosive volcanic eruptions located near the equator cool the global climate for 12 years How do they cool the climate 1 Emit lots of black ash and 02 gas which reaches the stratosphere remains there for 12 years 2 502 gas converts to sulfate aerosols which are very re ective Ireflect incoming solar radiation cooling the surface How do volcanic eruptions affect the earth 5 climate 1 Sulfate aerosols are fine particles 2 They re ect solar radiation 3 Cools the earth surface 4 Lasts 12 years Volcanoes near the equator 0 Upper level winds Hadley cell circulation transports the sulfate aerosols to cover both hemispheres spreads aerosols N amp S large impact on global climate Volcanoes at higher altitudes o Winds transport the ash amp gases to cover a smaller area less impact Ol ll IOA Q I O I o q III 1 Cooler global temps for 12 years narrow rings 2 Cold snaps for 12 weeks frost rings Sunsp s 0 Output of energy from the sun varies slightly over time More sunspotsmore solar radiation How do sunspots affect the energy budget 1 More solar radiation is absorbed at surface 2 Earth39s surface temperature increases 3 Earth emits more long wave radiation 4 Earth39s temperature increases slightly for about 10 years
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