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In "hydrology, moisture recycling or precipitation recycling refer to the process by which a portion of the "precipitated "water that "evapotranspired from a given area contributes to the precipitation over the same area. Moisture recycling is thus a component of the "hydrologic cycle. The ratio of the locally derived precipitation () to total precipitation () is known as the recycling ratio, : .

The recycling ratio is a diagnostic measure of the potential for interactions between "land surface hydrology and regional "climate.[1] [2] [3][4] "Land use changes, such as "deforestation or "agricultural intensification, have the potential to change the amount of precipitation that falls in a region. The recycling ratio for the entire world is one, and for a single point is zero. Estimates for the recycling ratio for the "Amazon basin range from 24% to 56%, and for the "Mississippi basin from 21% to 24%.[5]

The concept of moisture recycling has been integrated into the concept of the "precipitationshed. A precipitationshed is the upwind ocean and land surface that contributes evaporation to a given, downwind location's precipitation. In much the same way that a watershed is defined by a topographically explicit area that provides surface runoff, the precipitationshed is a statistically defined area within which evaporation, traveling via moisture recycling, provides precipitation for a specific point.


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  1. ^ Koster, R.; Jouzel, J.; Suozzo, R.; Russell, G.; Broecker, W.; Rind, D.; Eagleson, P. (February 1986). "Global sources of local precipitation as determined by the Nasa/Giss GCM". Geophysical Research Letters. 13 (2): 121–124. "doi:10.1029/GL013i002p00121. 
  2. ^ Trenberth, Kevin E. (May 1999). "Atmospheric Moisture Recycling: Role of Advection and Local Evaporation". Journal of Climate. 12 (5): 1368–1381. "doi:10.1175/1520-0442(1999)012%3c1368:amrroa%3e2.0.co;2. 
  3. ^ Brubaker, Kaye L.; Entekhabi, Dara; Eagleson, P. S. (June 1993). "Estimation of Continental Precipitation Recycling". Journal of Climate. 6 (6): 1077–1089. "doi:10.1175/1520-0442(1993)006%3c1077:eocpr%3e2.0.co;2. 
  4. ^ van der Ent, Rudi J.; Savenije, Hubert H. G.; Schaefli, Bettina; Steele-Dunne, Susan C. (1 September 2010). "Origin and fate of atmospheric moisture over continents". Water Resources Research. 46 (9): W09525. "doi:10.1029/2010WR009127. "ISSN 1944-7973. 
  5. ^ Moisture recycling Archived January 16, 2006, at the "Wayback Machine.


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