کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4372753 | 1303077 | 2009 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Precipitation on land versus distance from the ocean: Evidence for a forest pump of atmospheric moisture
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کلمات کلیدی
Hydrology - آبشناسی یا هیدرولوژیEvaporation - تبخیرTranspiration - تعرقAfforestation - جنگل کاری یا احداث جنگل Deforestation - جنگلزداییRunoff - رونابAridity - سرگیجهLeaf area index - شاخص سطح برگWater resources - منابع آبSustainability - پایداریWater cycle - چرخه آبAtmospheric circulation - گردش خون جوی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
بوم شناسی، تکامل، رفتار و سامانه شناسی
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چکیده انگلیسی
Flux of oceanic moisture brought inland by winds has been conventionally considered as a geophysical parameter practically unaffected by vegetation; accordingly, models predict only slight post-deforestation precipitation reductions. Here we show that the dependence of annual precipitation on distance x from the ocean differs markedly between the world's forested and non-forested continent-scale regions. In the non-forested regions precipitation declines exponentially with distance from the ocean with an established global mean e-folding length of l â¼Â 600 km. In contrast, in the forest-covered regions precipitation does not decrease or even grow along several thousand kilometers inland. Using a novel physical mechanism involving the non-equilibrium distribution of atmospheric water vapor it is explained how the high transpiration fluxes developed by forests enable them to pump atmospheric moisture from the ocean to any distance inland to compensate for the gravitational runoff of water. Our results indicate that forest cover plays a major role in the atmospheric circulation and water cycling on land. This suggests a good potential for forest-mediated solutions of the global desertification and water security problems.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecological Complexity - Volume 6, Issue 3, September 2009, Pages 302-307
Journal: Ecological Complexity - Volume 6, Issue 3, September 2009, Pages 302-307
نویسندگان
Anastassia M. Makarieva, Victor G. Gorshkov, Bai-Lian Li,