Physics – Geophysics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.h14a..02j&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #H14A-02
Physics
Geophysics
[0933] Exploration Geophysics / Remote Sensing, [1816] Hydrology / Estimation And Forecasting, [1855] Hydrology / Remote Sensing, [3360] Atmospheric Processes / Remote Sensing
Scientific paper
Satellites provide the only viable source from which precipitation can be measured over much of the planet, including almost all of the earth that is covered by water. But because these remotely-sensed quantities are indirect measurements of precipitation at the surface that are based primarily upon variations in the radiative characteristics of hydrometeors and clouds in the atmosphere, the accuracy of the estimates must be assessed routinely by comparing them with direct measurements at the earth’s surface. To that end, the International Precipitation Working Group which is administered by the World Meteorological Organization has directed a coordinated validation program to routinely assess the accuracy of precipitation estimates that are derived from satellite data. At the present time, routine assessments are made over Australia, Japan, much of South America, western Europe, and the U. S. In this presentation, the validation results over the U.S. are revealed. Because the U.S. has a relatively dense rain gauge network, robust validation statistics on daily precipitation totals provide reliable assessments of satellite algorithm performance by region, season, and atmospheric regime. And because the U.S. also has a national radar composite product, assessments at sub-daily time scales (hourly) can be performed. Results are presented in both forms, i.e., on daily totals and for individual satellite swaths as matched with radar.
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