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Massive Flood Caused Climate Change?
Via the Sun Valley News, Monga Bay.com and Eureka Alert, comes a fascinating story about a study funded by NASA, National Defense Science and Engineering Graduate Fellowship, and the National Science Foundation.
The group used an atmosphere-ocean coupled climate model known as GISS Model E-R to simulate the climate impact of a massive freshwater flood into the North Atlantic that happened about 8,200 years ago after the end of the last Ice Age. As retreating glaciers opened a route for two ancient meltwater lakes known as Agassiz and Ojibway to suddenly and catastrophically drain from the middle of the North American continent.
At approximately the same time, climate records show that the Earth experienced its last abrupt climate shift. Scientists believe that the massive freshwater pulse interfered with the ocean’s overturning circulation, which distributes heat around the globe. According to the record of what are known as climate proxies, average air temperatures apparently dropped fell as much as several degrees in some areas of the Northern Hemisphere.
Climate researchers use these proxies–chemical signals locked in minerals and ice bubbles as well as pollen and other biological indicators–as indirect measures of temperature and precipitation patterns in the distant past. Because GISS Model E-R incorporates the response of these proxies in its output, the authors of the PNAS study were able to compare their results directly to the historical record.
http://myopiczeal.blogsome.com/2006/01/10/massive-flood-caused-climate-change/trackback/
