Abstract
This paper analyzes the sea surface backward thermal radiation data in the China Sea observed by the mmwave channel of FY3 MWRI, explains the reason for which the analysis method combined with multiple mmwave channels is conducive to wind inversion, uses the complex model of the two-scale randomly rough surface with foam scattering layer to calculate the backward heat emission, analyzes the different response characteristics of the thermal radiation characteristics of each channel with the change of the sea surface wind speed, and establishes the wind speed inversion model applying to the microwave radiometer, achieving better results than in previous studies. The sea surface medium-low wind speed precision standard deviation of new model reaches 1.2 m/s (0 - 15 m/s); the inversion strong wind data are consistent with the island fixed buoys data, and the global sea surface wind speed image schematic diagram is given.
Highlights
Throughout the world, many measuring methods for the sea surface wind field based on the satellite have been put into use, such as active radar and the common scatterometer (e.g. Seasat, ERS-I and II, ADEOS), and have achieved great success
In this study, basing on the sea surface wind speed inversion model, we analyze the differences of backward heat radiation on the sea surface received by each channel with the change of the wind speed, set the channel configuration, establish the regression analysis method with new model coefficient, propose the wind reversion method, achieving a better result, and provide a schematic diagram for global sea surface wind speed
This paper first introduced the development of the sea surface wind speed model inversed using a satellite-borne scatterometer and microwave radiometer and wind inversion problems throughout the world, as well as the preparation of the data source, including the introduction of the MWRI instrument and verification of the buoy
Summary
Throughout the world, many measuring methods for the sea surface wind field based on the satellite have been put into use, such as active radar and the common scatterometer (e.g. Seasat, ERS-I and II, ADEOS), and have achieved great success. Based on the research of Jin Yaqiu et al, it can be observed that the heat radiation effect received by the microwave radiometer [4] tends to saturate due to the disturbance from the foam scattering layer in strong wind areas. In this study, basing on the sea surface wind speed inversion model, we analyze the differences of backward heat radiation on the sea surface received by each channel with the change of the wind speed, set the channel configuration, establish the regression analysis method with new model coefficient, propose the wind reversion method, achieving a better result, and provide a schematic diagram for global sea surface wind speed. We verify the accuracy and practicability of the model, providing a new concept for China to use a satellite-borne microwave radiometer to measure global sea surface wind speed [8] [9] [10]
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