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Comparison of monthly means of global total column water vapor retrieved from independent satellite observations
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Titel: |
Comparison of monthly means of global total column water vapor retrieved from independent satellite observations |
In: | Journal of Geophysical Research: Atmospheres, 115, 2010, D23 |
veröffentlicht: |
American Geophysical Union (AGU)
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ISSN: |
0148-0227 |
DOI: | 10.1029/2010jd013946 |
Zusammenfassung: | <jats:p>Two independent data sets of monthly means of total column water vapor (TCWV) have been compared. The first data set is the European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT) Satellite Application Facility on Climate Monitoring's (CM‐SAF) Hamburg Ocean Atmosphere Parameters and Fluxes from Satellite Data (HOAPS) product, which is based on passive microwave observations from the Special Sensor Microwave/Imager (SSM/I). It is available over oceans only and includes the TCWV also from cloudy scenes. The second one relies on Global Ozone Monitoring Experiment/Scanning Imaging Absorption Spectrometer for Atmospheric Cartography (GOME/SCIAMACHY) measurements, which are carried out in the visible part of the solar spectrum and present a partly cloud corrected climatology that is available over land and ocean. The comparison is performed for the period 1996 to 2005 for ice‐free ocean areas. This comparison helps to analyze the potential of the two data sets to provide an independent merged TCWV data set for all surface types in the future. A systematic difference or bias is observed between both data sets, with lower TCWV for GOME/SCIAMACHY. The dominating cause (80–90%) for the difference in monthly averages is the cloud correction approach used within the GOME/SCIAMACHY retrieval scheme. We show that the bias contains a pronounced seasonal component and relies on cloud properties such as the cloud water path.</jats:p> |
Format: | E-Article |
Quelle: | American Geophysical Union (AGU) (CrossRef) |
Sprache: | Englisch |