Global warming and Precipitation

Global warming from greenhouse gases affects rainfall patterns in the world differently than that from solar heating, according to a study.
The scientists, led by Jian Liu (Chinese Academy of Sciences) and Bin Wang (International Pacific Research Center, University of Hawaii at Manoa), showed that global rainfall has increased less over the present-day warming period than during the Medieval Warm Period, even though temperatures are higher today than they were then.
As a result of global warming, precipitation is likely to increase in high latitudes and the tropics and to decrease in already dry subtropical regions.

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http://phys.org/news/2013-01-greenhouse-gases-solar-complexity-global.html
http://www.nature.com/nature/journal/v493/n7434/full/nature11784.html

 doi:10.1038/nature11784

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