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Large-scale deforestation in tropical rainforests can dramatically reduce rainfall rates both locally and thousands of kilometres away, according to a study published in Nature yesterday (5 September). This could have a potentially devastating impact on communities living in or close to the Amazon and Congo rainforests.
This drop occurs because deforestation reduces the natural recycling of moisture from soils, through vegetation, and into the atmosphere, from where it returns as rainfall.
When forests are replaced by pasture or crops, this water recycling process changes, "leading to reduced atmospheric humidity and potentially suppressing precipitation", according to researchers from the University of Leeds and the Centre for Ecology and Hydrology, in the United Kingdom.
To measure this activity, researchers combined satellite data on vegetation with data on the direction of prevailing winds. They combined this with satellite data on precipitation to determine whether the air's increased exposure to vegetation had an effect on rainfall.
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Explanation:
The drop occurs because deforestation reduces the natural recycling of moisture from soils ,through vegetation and into the atmosphere from where it returns as rainfall they combined this with satelite data on precipitation to determine whether the air increased exposure to vegetation had an effect on rainfall..
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