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Observation-Corrected Precipitation Estimates in GEOS-5Several GEOS-5 applications, including the GEOS-5 seasonal forecasting system and the MERRA-Land data product, rely on global precipitation data that have been corrected with satellite and or gauge-based precipitation observations. This document describes the methodology used to generate the corrected precipitation estimates and their use in GEOS-5 applications. The corrected precipitation estimates are derived by disaggregating publicly available, observationally based, global precipitation products from daily or pentad totals to hourly accumulations using background precipitation estimates from the GEOS-5 atmospheric data assimilation system. Depending on the specific combination of the observational precipitation product and the GEOS-5 background estimates, the observational product may also be downscaled in space. The resulting corrected precipitation data product is at the finer temporal and spatial resolution of the GEOS-5 background and matches the observed precipitation at the coarser scale of the observational product, separately for each day (or pentad) and each grid cell.
Document ID
20150000725
Document Type
Technical Memorandum (TM)
Authors
Reichle, Rolf H.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Liu, Qing
(Science Systems and Applications, Inc. Greenbelt, MD, United States)
Date Acquired
January 23, 2015
Publication Date
December 1, 2014
Subject Category
Earth Resources And Remote Sensing
Meteorology And Climatology
Report/Patent Number
GSFC-E-DAA-TN19768
NASA/TM-2014-104606/Vol 35
Funding Number(s)
CONTRACT_GRANT: NNG12HP06C
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Data Assimilation
Precipitation
GEOS-5

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