Apr 21, 2009 | 11
In one of the oddities of parsing the regional effects of global climate change, researchers have noted that the U.S. Southeast has seen average high temperatures dip by as much as 0.38 degrees Fahrenheit (0.21 degrees Celsius) over the course of the 20th century. Curious, atmospheric scientist Robert Portmann of the National Oceanic and Atmospheric Administration (NOAA) and his colleagues decided to take a look at what might be causing it.
Their findings, published yesterday in the Proceedings of the National Academy of Sciences USA: that increasing spring rainfall during May and June each year in parts of the southeastern U.S. appeared to be keeping down average high temperatures, based on a study of thousands of readings from weather stations in the Global Historical Climatology Network Daily system.
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