GRG 366C Lecture 2 Notes
GRG 366C Lecture 2 Notes GRG 366C
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This 2 page Class Notes was uploaded by Cassidy Schap on Sunday September 27, 2015. The Class Notes belongs to GRG 366C at University of Texas at Austin taught by Thoralf Meyer in Summer 2015. Since its upload, it has received 27 views. For similar materials see Comparative Ecosystems in Geography at University of Texas at Austin.
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Date Created: 09/27/15
Lecture 02 Climate Absorption incoming radiation hits a molecule producing an excited state It is reradiated at a longer wavelength 0 Re ection radiation bounces off a surface complex process The process has a direction 0 Perfect re ector incoming angle equals outgoing angle 0 Scattering another form of re ection differs from re ection because there is no direction Potentially re ected in every direction 0 Raleigh scattering matter 01 lt incoming radiation 02 N Mie scattering matter incoming radiation aerosols particles Unselective scattering matter 10times gt incoming radiation water vapor Atmosphere closes down in certain parts of the spectrum Atmo is composed of different chemicals Visible light reaches the surface of the earth and is reradiated in the form of heat 0 Short wave in long wave out o Atm is full of components H20 02 03 N20 etc that re ect and scatter the reradiated heat 0 Radiation from the sun in converted to long wave radiation by earth and radiated back 0 The mols and atoms form a heating blanket Without it temp of the earth would be 30 degrees cooler and uninhabitable 0 Water wouldn t be available except in the form of ice 0 Life not possible 0 Greenhouse gasses are not necessarily a bad thing Atmo is layered tropo strato meso thermo Meteors burn up somewhere in the meso The areas between the tropic of cancer and the tropic of Capricorn are called the paleotropics and neotropics biogeographical term Oceans carry moisture onto the air current which causes a rain shadow effet on the leeward side of mountains rain shadow effect 0 PET potential evapotrans o In a biome where water is not limited rainforest tropical swamp PET actual ET 0 In a biome where water is limited desert savanna PET gt Actual ET Amount of precipitation received over an area depends on topography prevailing winds proximity to ocean general latitude 3 diff kinds of air movements cells over the earth to measure average temp you have to be aware of the hourto hourdaybyday changes as well day night today yesterday also account for seasonal changessun is in diff places causes dif tempsrainfall also take el nino effect into account over the paci cocean currents reverse move in opposite direction causing cold water to be where warm currents usually are and vice versa fucks up lots of ecosystem stuff like upwelling on coasts which fucks up shingclimate study the chemical comp of air bubbles trapped in ice to examine the differences in oxygen and coZ these levels change bc vegetation changes during an ice age period there is signi cantly less vegetation thus the levels of coZ are higher oxygen levels are lower Tundra treeless biome in the far north Consists of boggy plains covered by lichens and mosses rarely taller than 12 in Permafrost and little precip leads to water limitations Harsh cold winters Extremely short summers Little precipitation rain or snow 4 10 inches Low species diversity High organic content in soil but slow nutrient cycle due to climate Observed min temp and observed max temp are v different Water availability is often low bc it is frozen due to low temps Maybe melted from may to September when temps are at peak highs Other 8 months producer side of biome shuts down due to lack of water Permafrost prevents a lot of decomp Amount of organic material in the soil is v high bc decomp process is v slow
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