Retrieval of Mean Square Slopes of Sea Waves, Surface Wind Speed, Total Water Vapor Content and Total Cloud Liquid Water Content in Hagibis Typhoon Area from Satellite Active and Passive Microwave Data

摘要

Probing of the typhoon Hagibis in stage of maximum intensification with satellite active and passive microwave sensors onboard GPM (Global Precipitation Measurements), GCOM-W1, Meteor-M No. 2-2 and Sentinel-1 satellites permitted retrieving the ocean surface and atmospheric parameters and investigate evolution of their spatial structure. Wind speed W, cloud liquid water content Q and total atmospheric water vapor content V were estimated from GMI and AMSR2 data with original algorithm based on total atmospheric absorption at frequency of 10.65 GHz τ(10). Mean square slope (mss) was retrieved from Ku-band channel of DPR radar. The location of typhoon center was traced due to the difference of retrieved parameters between the eye and surrounding area. Hagibis warm core was found by MTVZA-GY radiometer at several frequencies at oxygen absorption band. The position of the sharp gradient zones in V, Q and τ(10) fields served as an indicator of the change of typhoon area and structure. The calm cloudless region in the western Japan Sea was used as the reference area for matching to zero level of the retrieved wind speed and mss.