Module 9 Notes
Module 9 Notes Geoscience 115
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This 2 page Class Notes was uploaded by Hannah James on Sunday September 6, 2015. The Class Notes belongs to Geoscience 115 at University of Wisconsin - Madison taught by Philip Brown in Spring 2014. Since its upload, it has received 18 views. For similar materials see Science Behind the News- The World Around Us in Geology at University of Wisconsin - Madison.
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Date Created: 09/06/15
Geoscience Module 9 Global Warming Pass the Ice 0 There are signs that we are on the verge of dangerousand possibly catastrophic warming 0 Possibly because of carbon emissions changing the atmosphere 0 Some scientists say that climate is less stable than we once predicted and changes rapidly on its own 0 Recent studies have found that then lower atmosphere has shown no temperature change in from the 70 s to the 90 s and the stratosphere cooled 06 degrees per decade 0 So how does the climate warm without the atmosphere warming scientists said we don t know 0 However a recent report negated this and showed that the atmosphere increased in temperature almost as much as the surface 0 While climate often varies slightly from year to year it has been shown that recent variations seem to be upward 0 The greenhouse effect starts with light and its wavelengths difference between adjacent waves 0 Hotter objects emit shorter more energetic wavelengths colder longer 0 Sun emits lots of UV and visible light wavelengths which are absorbed by earth I Some of it is reemitted back to space but the earth is cooler so it is long infrared wavelengths 0 While the sun s shorter wavelengths pierce the atmosphere the longer wavelengths from earth are trapped by greenhouse gases water vapor methane and carbon dioxide 39 Carbon emissions is increasing the levels of carbon dioxide in the atmosphere 0 Climate can change erratically 0 Data shows that in the younger days that followed the ice age 13000 years ago the climate cooled as much as 5 degrees in five years I This occurred in Greenland and it s unclear if it occurred in other areas 0 Evidence shows is occurred at least in Antarctica too O The temperature then suddenly cooled 39 Showed that this rapid warming occurred because of changes in ocean circulation 0 Melted fresh water from the area went into the ocean preventing the downturn of cold salty ocean water to the sea oor and disturbing the ow of heat to Greenland and Northern Europe 0 Scientists now consider land and ocean changes as well as atmospheric changes when discussing global warming 0 Changing forested area to farmland would greatly warm our climate 0 Deforestation would also greatly reduce rainfall because so much of is it caused by plant transpirationeVaporative cooling 0 So trends in plant life could better explain long term climate change in the past because atmosphere changes too rapidly to explain the long term variations
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