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Testing gridded NWS 1-day observed precipitation analysis in a daily irrigation scheduler

Agricultural Sciences 2013年第12期4卷 621-627页

作者： gretchen f. sassenrath J. M. Schneider A. M. Schmidt J. Q. Corbitt J. M. Halloran R. Prabhu Biological Systems Engineering University of Nebraska Lincoln USA Department of.Agricultural and Biological Engineering Mississippi State University Mississippi USA Southeast Agricultural Research Center Kansas State University Parsons USA USDA Agricultural Research Service Crop Production Systems Research Unit Stoneville USA USDA Agricultural Research Service Grazinglands Research Laboratory El Reno USA USDA Agricultural Research Service New England Plant Soil and Water Research Laboratory University of Maine Orono USA

One of.the inputs required by daily decision support tools f.r scheduling irrigation is the amount of.water supplied by rainf.ll. In-f.eld measurements of.daily precipitation are expensive or laborious, while measurements f.om gauges within a f.w kilometers are f.equently not representative due to the high spatiotemporal variability of.precipitation. Online radarbased precipitation analyses f.om NOAA’s National Weather Service (NWS) have obvious potential to provide the needed data, but are known to have varying degrees of.accuracy with location and conditions. The NWS precipitation analysis is computed on a 4 km × 4 km grid, so dif.erences should also be expected between the product and individual gauge measurements under each grid cell. In order to test the utility of.the NWS precipitation analysis in a daily irrigation scheduler, daily data were gathered in July 2012 f.om 18 weather stations under 2 NWS precapitation analysis grid cells across instru-mented research and production f.elds in the Mississippi Delta. Dif.erences between individual station measurements and the NWS precipitation analysis are examined, and root-zone daily soil water def.cits computed using both station data and the NWS precipitation analysis. Sub-grid spatial variability between gauge locations, and dif.erences in precipitation between gauges and the gridded NWS analysis, are f.und to be similar to those reported elsewhere. Dif.erences between time series of.soil water def.cit computed using the two dif.erent precipitation data sources are noted, but prove to be of.limited impact on the decision to irrigate or not to irrigate. It is also noted that prof.le-f.lling rainf.lls limit the impact of.accumulating error, resetting the modeled soil water to “f.ll”. Given the Delta-local practice of.irrigating to replace f.ll evapotranspirational water used, use of.the NWS daily precipitation analysis data as input f.r a daily irrigation scheduler is judged not only acceptable, but also pref.rabl

关键词： Irrigation Daily Precipitation Scheduler Gridded Radar

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