cheapbag214s
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 Posted: Sun 19:17, 01 Sep 2013 Post subject: Irrigation hiding climate change effects in some r |
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Irrigation hiding climate change effects in some regions,[link widoczny dla zalogowanych]
Expanded irrigation might mitigate the effects of climate change in some areas,[link widoczny dla zalogowanych], a new study has revealed.
But some major groundwater aquifers,[link widoczny dla zalogowanych], a source of irrigation water,[link widoczny dla zalogowanych], are projected to dry up in coming decades from continuing overuse,[link widoczny dla zalogowanych], and when they do,[link widoczny dla zalogowanych], people may face the double whammy of food shortages and higher temperatures.
important question for the future is what happens to the climate if the water goes dry and the cooling disappears? How much warming is being hidden by irrigation? asked Michael Puma at Columbia University Earth Institute and its affiliated NASA Goddard Institute for Space Studies. On one hand,[link widoczny dla zalogowanych], earth oceans and vegetation have been absorbing a growing share of emissions with declining rates of absorption. But humans are also cooling the planet to some degree, by releasing air-polluting particles that lower temperatures by reflecting the sun energy back into space.
Mr. When the soil is wet,[link widoczny dla zalogowanych], part of the sun energy is diverted from warming the soil to vaporizing its moisture,[link widoczny dla zalogowanych], creating a cooling effect.
The study suggests that irrigation may be altering the pattern of the Asian monsoon,[link widoczny dla zalogowanych], the rains that feed nearly half of the world population.
study points to the importance of including irrigation in regional and global climate models so that we can anticipate precipitation and temperature impacts,[link widoczny dla zalogowanych], and better manage our land, water and food in stressed environments,[link widoczny dla zalogowanych], Mr. Lall said.
The study is published in the Journal of Geophysical Research,[link widoczny dla zalogowanych]. ANI) Ends NM
Keywords: climate change,[link widoczny dla zalogowanych], irrigation methods
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