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Politics : Politics of Energy
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To: Brumar89 who wrote (14671)12/5/2009 9:18:04 PM
From: RetiredNow  Read Replies (1) of 86356
 
climatescience.gov

Scientists extensively use mathematical models of Earth’s climate, executed on the most powerful computers available, to examine hypotheses about past and present-day climates. Development of climate models is fully consistent
with approaches being taken in many other fields of science dealing with very complex systems. These climate simulations provide a framework within which enhanced understanding of climate-relevant processes, along with improved observations, are merged into coherent projections of future climate change. This report describes the models and their ability to simulate current climate...

Climate sensitivity in models is subjected to tests using observational constraints. Tests include climate response to volcanic eruptions; aspects of internal climate variability that provide information on the strength of climatic “restoring forces”; the response to the 11-year cycle in solar irradiance; paleoclimatic information, particularly from the peak of the last Ice Age some 20,000 years ago; aspects of the seasonal cycle; and the magnitude of observed warming over the past century. Because each test is subject to limitations in data and complications from feedbacks in the system, they do not provide definitive tests of models’ climate sensitivity in isolation. Studies in which multiple tests of model climate responses are considered simultaneously are essential when analyzing these constraints on sensitivity.
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