Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2017, Vol. 14, No. 1, pp. 207-215
Atmospheric total water vapor content retrieval using satellite microwave radiometer measurements of AMSR2
E.V. Zabolotskikh
1 , B. Chapron
2 1 Russian State Hydrometeorological University, Saint Petersburg, Russia
2 IFREMER, Brest, France
Accepted: 21.11.2016
DOI: 10.21046/2070-7401-2017-14-1-207-215
The method of integrated water vapor content retrieval over open ocean from the data of Advanced Microwave Scanning Radiometer 2 (AMSR2) onboard GCOM-W1 satellite is presented. The method is based on the numerical modeling of the brightness temperatures of non-precipitating ocean-atmosphere system. Neural Network approach is used for the inverse problem solution. Before use measured brightness temperatures are corrected to adjust model values to measured ones. This adjustment is based on the comparison of the AMSR2 measurements and brightness temperature calculations for the database of cloudless radiosounding measurements. The validation is fulfilled using independent radiosounding data from small island stations. The retrieval accuracy proved to be 1.14 kg/m2 for the tropical radiosounding station and 0.86 kg/m2 for polar stations. The total retrieval accuracy proved to be equal to the one calculated using model data – 1 kg/m2.
Keywords: integrated water vapor content, numerical modeling, brightness temperature, satellite passive microwave radiometers, Neural Network retrieval algorithms, AMSR2
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