Tuesday, May 26, 2015

California - Why So Dry?

California Drought Caused By Climate Change

Human released greenhouse gas pollution changes the climatic system through a variety of mechanisms. Trade winds and jet streams change their patterns of movement, and the distribution of moisture in the air changes, with precipitation either lacking more than usual or being more abundant than usual. The patterns of movement of major air masses and the increased bifurcation of air masses into more wet than usual and more dry than usual can result in long periods where region experiences excess precipitation or a lack of precipitation. When the latter happens, there can be a drought.

Increasingly, the California drought is being seen as an effect of climate change. Air masses that should have contributed precipitation in the form of mountain snow, which in turn feed the western ground water system, have been kept away. Increased temperature has increased evaporation. Other factors related to climate change have contributed. The result is an historic drought over California that shows at present no sign of stopping any time soon. There was hope that last winter there would be additional precipitation, and there was some, but not enough. Read More

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