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Production of long-term global water vapor and liquid water data set using ultra-fast methods to assimilate multi-satellite and radiosonde observationsDuring the next decade, many programs and experiments under the Global Energy and Water Cycle Experiment (GEWEX) will utilize present day and future data sets to improve our understanding of the role of moisture in climate, and its interaction with other variables such as clouds and radiation. An important element of GEWEX will be the GEWEX Water Vapor Project (GVaP), which will eventually initiate a routine, real-time assimilation of the highest quality, global water vapor data sets including information gained from future data collection systems, both ground and space based. The comprehensive global water vapor data set being produced by METSAT Inc. uses a combination of ground-based radiosonde data, and infrared and microwave satellite retrievals. This data is needed to provide the desired foundation from which future GEWEX-related research, such as GVaP, can build. The first year of this project was designed to use a combination of the best available atmospheric moisture data including: radiosonde (balloon/acft/rocket), HIRS/MSU (TOVS) retrievals, and SSM/I retrievals, to produce a one-year, global, high resolution data set of integrated column water vapor (precipitable water) with a horizontal resolution of 1 degree, and a temporal resolution of one day. The time period of this pilot product was to be det3ermined by the availability of all the input data sets. January 1988 through December 1988 were selected. In addition, a sample of vertically integrated liquid water content (LWC) was to be produced with the same temporal and spatial parameters. This sample was to be produced over ocean areas only. Three main steps are followed to produce a merged water vapor and liquid water product. Input data from Radiosondes, TOVS, and SSMI/I is quality checked in steps one and two. Processing is done in step two to generate individual total column water vapor and liquid water data sets. The third step, and final processing task, involves merging the individual output products to produce the integrated water vapor product. A final quality control is applied to the merged data sets.
Document ID
19940030993
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Vonderhaar, T. H. (METSAT, Inc. Fort Collins, CO, United States)
Reinke, Donald L. (METSAT, Inc. Fort Collins, CO, United States)
Randel, David L. (METSAT, Inc. Fort Collins, CO, United States)
Stephens, Graeme L. (METSAT, Inc. Fort Collins, CO, United States)
Combs, Cynthia L. (METSAT, Inc. Fort Collins, CO, United States)
Greenwald, Thomas J. (METSAT, Inc. Fort Collins, CO, United States)
Ringerud, Mark A. (METSAT, Inc. Fort Collins, CO, United States)
Wittmeyer, Ian L. (METSAT, Inc. Fort Collins, CO, United States)
Date Acquired
September 6, 2013
Publication Date
July 1, 1993
Subject Category
Meteorology And Climatology
Report/Patent Number
NASA-CR-195981
NAS 1.26:195981
REPT-93-103
Accession Number
94N35499
Funding Number(s)
CONTRACT_GRANT: NASW-4715
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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