Abstract
A method for improvement of ocean wind speed estimation accuracy by taking into account the relation between wind speed and wind direction is proposed. Brightness temperature observed with microwave radiometer onboard satellite is modified with microwave radiometer derived wind direction proposed by Frank Wentz. Using the modified brightness temperature, more precise wind speed is estimated. Experiments with AMSR-E and NCEP GDAS data show improvements of wind speed estimation in comparison to the existing method based on the geophysical model of Frank Wentz together with the retrieval algorithm of Akira Shibata.
Highlights
By comparing the observed brightness temperature affected by the relative wind direction with the observed brightness temperature not affected, the effect of the relative wind direction on the observed brightness temperature was found
In the case of the data used in this study, it was found that the estimation accuracy of the wind speed changed by using the model in which the proposed relative winds direction affects the luminance temperature
When the estimation accuracy of the relative wind direction estimated at the same time was relatively good, the estimation accuracy of the wind speed was improved
Summary
It is known that the estimation accuracy of the wind speed changes due to the influence of the relative wind direction in the marine physical quantity cage determination using microwaves. Observation of atmosphere, ocean, and land with multi-wavelength microwave radiometer is introduced [5] At this time, the influence of the relative wind direction was taken into consideration. Arai and Sakakibara proposed a method using the Wentz algorithm using improved simulated annealing for the radiometer ASMR-E [6] This made it possible to simultaneously estimate various marine physical quantities, which led to an improvement in the estimation structure. Experiments with AMSR-E and NCEP GDAS data show improvements of wind speed estimation in comparison to the existing method based on the geophysical model of Frank Wentz together with the retrieval algorithm of Akira Shibata.
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