A Backscattering Model of Rain-Affected Sea Surface With Two-Scale Method

作者：Hongxia Ye, Chenyu Guo · 发表于：IEEE Transactions on Geoscience and Remote Sensing · 年份：2024 · DOI：10.1109/tgrs.2024.3428470 · 被引用次数：6 · 研究领域：Ocean Waves and Remote Sensing、Coastal and Marine Dynamics、Soil Moisture and Remote Sensing

Rainfall changes the geometric undulation of wind-driven sea surface, thereby altering the traditional relationship between wind vector and backscattering coefficient, which poses some challenges for microwave remote sensing measurement and inversion. This article proposes a new sea spectrum model based on the wind-driven Apel spectrum combining some correction factors of rain-generated ring waves, rain-induced damping, and rain-induced roughness. Then, this new spectrum is used to compute the backscattering coefficients using a two-scale method (TSM) with approximate cutoff wavenumber in the Ku-band. Comparison with the observational data of HY-2B scatterometer indicates that the simulated results after rainfall correction are more consistent with satellite observation. The simulation error for vertical polarization decreases from 2.574 to 1.9200 dB, while the error for horizontal polarization decreases from 3.2965 to 2.8153 dB. In addition, the comparison with the empirical geophysical model function (GMF) models also confirmed the accuracy and reliability of the new spectrum of rain-impacted sea surface.