Tropical Cyclone Sea Surface Wind Field Inversion And Preliminary Application Based On Microwave Scatterometer And Infrared Spin-scan Radiometer

The typhoon is a tropical cyclone with a sustained wind speed of 32.7 meters per second or more at the center of the Pacific Northwest,it's a powerfully destructive weather system,often brings serious casualties and economic losses to coastal areas.China is near by the Pacific Northwest and has a vast coastline.It is one of the countries most affected by typhoons in the world.Reliable ocean surface wind forecast is extremely important for navigation and offshore operations,the acquisition of typhoon sea surface wind farm has greater significance for disaster warning.Using remote sensing satellite data to monitor the sea surface has become an important technology.The microwave scatterometer mounted on the HY-2 satellite can acquire a wind field 10 meters away from the sea.However,its low time resolution does not meet the need for continuous monitoring of the sea surface wind field in a given sea area.Static meteorological satellite FY-2 cloud image with high time resolution but the data is cloud top wind farm,which has certain limitations.In this study,the data from the HY-2 microwave scatterometer and data from the FY-2 infrared scanning radiometer were used to study the inversion method of the typhoon sea surface wind field.Firstly,the sea surface wind speed data and cloud top brightness temperature data are obtained by preprocessing the wind field data obtained from the two satellites.Secondly,the correlation between wind speed data and brightness temperature data was analyzed.Through regression analysis,it was proved that the both have good positive correlation and meet the fitting needs.Then,the data was substituted into four single-factor regression models to determine the linear regression model with the highest correlation coefficient as the model type for this inversion,and an inversion model for the typhoon sea surface wind field was established.Finally,the typhoon sea gale area and wind circle radius were extracted from the sea surface wind field obtained by inversion,and experiments were performed using Typhoon Usagi,Fitow and Nari.The results show that the inversion model of the typhoon sea surface wind field is effective and can be used to invert the sea surface wind field with high time resolution.The inversion error of the tested wind speed is about 2 m/s.In this paper,the method of extracting large wind zone and wind circle radius based on continuous sea surface wind field successfully extracts the large wind zone and wind circle radius at each moment,and provides auxiliary decision-making basis for related departments to carry out antidisaster reduction work.