2014, Volume 16, Issue 6
Strategic Study of CAE >> 2014, Volume 16, Issue 6
Comparison of wind speed from 3 main payloads of HY-2 satellite
National Satellite Ocean Application Service，100081 Beijing，China
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Abstract
Sea surface wind speed has a very important role in the transfer of kinetic energy in the ocean, and the exchange of the matter and energy in the air-sea surface. There are three payloads on HY-2 satellite which can be used to detect the sea surface wind speed. The payloads are radar altimeter, microwave scatterometer and scanning microwave radiometer. The difference is that altimeter can measure the wind speed at the nadir point of the HY-2 satellite, microwave scatterometer can detect the wide swath wind field, and radiometer can measure the wide swath wind speed only. In order to analyze the capacity of the three payloads, in this study, the Usagi Typhoon is selected for comparing the ability of the three payloads to measure the wind speed. It turned out that when the wind speed is smaller than 20 m/s, the wind from altimeter is much the same as from microwave scatterometer. The standard deviation is less than 2 m/s. But when speed is between 20 m/s and 35 m/s, the wind speed of altimeter is close to the radiometer. Only the scanning microwave radiometer can be able to detect the wind speed larger than 35 m/s. Before using it to measure the wind speed larger than 35 m/s, we have to assess the accuracy of measurement.
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References
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