First Three Years of the Microwave Radiometer aboard Envisat: In-Flight Calibration, Processing, and Validation of the Geophysical Products

The Envisat microwave radiometer is designed to correct the satellite altimeter data for the excess path delay resulting from tropospheric humidity. Neural networks have been used to formulate the inversion algorithm to retrieve this quantity from the measured brightness temperatures. The learning d...

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Bibliographic Details
Published inJournal of atmospheric and oceanic technology Vol. 23; no. 6; pp. 802 - 814
Main Authors Obligis, E, Eymard, L, Tran, N, Labroue, S, Femenias, P
Format Journal Article
LanguageEnglish
Published Boston American Meteorological Society 01.06.2006
Subjects
Calibration
Earth Sciences
Environmental Sciences
Geophysics
Global Changes
Meteorology
Ocean circulation
Physics
Radiation
Radiative transfer
Remote sensing
Sciences of the Universe
Standard deviation
Statistical methods
Studies
Surface roughness
Temperature
Time series
Troposphere
Water
Weather forecasting
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Summary:The Envisat microwave radiometer is designed to correct the satellite altimeter data for the excess path delay resulting from tropospheric humidity. Neural networks have been used to formulate the inversion algorithm to retrieve this quantity from the measured brightness temperatures. The learning database has been built with European Centre for Medium-Range Weather Forecasts (ECMWF) analyses and simulated brightness temperatures by a radiative transfer model. The in-flight calibration has been performed in a consistent way by adjusting measurements on simulated brightness temperatures. Finally, coincident radiosonde measurements are used to validate the Envisat wet-tropospheric correction, and this comparison shows the good performances of the method. [PUBLICATION ABSTRACT]
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ISSN:0739-0572
1520-0426
DOI:10.1175/JTECH1878.1