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Improved Microwave Ocean Emissivity and reflectivity Models Derived from Two-Scale Roughness Theory

Advances in Atmospheric Sciences 2023年第10期40卷 1923-1938页

作者： Lingli HE Fuzhong WENG Chinese Academy of Meteorological Sciences Beijing 100081China University of Chinese Academy of Sciences Beijing 100049China CMA Earth System Modeling and Prediction Centre Beijing 100081China

The Geometrical Optics(GO)approach and the FAST Emissivity Model(FASTEM)are widely used to estimate the surface radiative components in atmospheric radiative transfer simulations,but their applications are limited in specific *** this study,a two-scale reflectivity model(TSRM)and a two-scale emissivity model(TSEM)are developed from the two-scale roughness *** GO which only computes six non-zero elements in the reflectivity matrix,The TSRM includes 16 elements of Stokes reflectivity matrix which are important for improving radiative transfer simulation accuracy in a scattering *** covers the frequency range from L-to *** dependences of all TSRM elements on zenith angle,wind speed,and frequency are derived and analyzed in *** a set of downwelling radiances in microwave frequencies,the reflected upwelling brightness temperature(BTs)are calculated from both TSRM and GO and compared for analyzing their *** TSRM not only includes the effects of GO but also accounts for the small-scale Bragg scattering effect in an order of several degrees in Kelvins in brightness ***,the third and fourth components of the Stokes vector can only be produced from the *** the emitted radiation,BT differences in vertical polarization between a TSEM and FASTEM are generally less than 5 K when the satellite zenith angle is less than 40°,whereas those for the horizontal component can be quite significant,greater than 20 K.

关键词： emissivity microwave remote sensing reflectivity matrix two-scale roughness theory

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