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Some measurements were taken 2 pac download in 2 pac download daylight, others in darkness. "Even though models predict a close link between atmospheric and surface 2 pac download temperatures, there has been a large difference in the actual measurements," says Steven C. Sherwood, associate professor of geology and geophysics at Yale, and lead author of the study. "This has muddied the interpretation of reported warming." Most scientists have concluded the surface warming has partly resulted from a buildup of greenhouse gases in the atmosphere. The key to the error in climate change estimates lay in instrument design, according to this study. With exposed sensors, measurements taken in daylight read too warm, and while solar heating had a measurable impact on the earlier designs, the effect became negligible in more recent designs. "It's like being outside on a hot day -- it feels hotter when you are standing in the direct sun than when you are standing in the shade," says Sherwood.
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