ATMOSPHERIC PARAMETERS OVER THE MARGINAL ICE ZONE RETREIVAL FROM ANSR/AMSR-E DATA

a direct radiative transfer model, 478 radiosondes complimented by the cloud liquid water content profiles and the underlying surface temperatures and emissivities were used to simulate the brightness temperatures tbs over the marginal ice zone at adeos-ii amsr and aqua amsr-e frequencies. the precipitable water v varied from 0.63 to 18.5kg/m2, the total cloud liquid water content q￡0.25kg/m2 and sst￡1°c. the mean experimental values of emissivity and its fluctuations for several types of the first-year ice at ice temperature of 263 to 271k were used in a model. the sea surface emissivity was computed taking into account wind action. 10 values of ice concentration c uniformly distributed from 0.0 to 1.0 were selected for each radiosonde. the radiometer noises of 0.5k were added to the modeled tbs. standard regression techniques were applied to retrieve v, q and c from the simulated tbs with vertical and horizontal polarization at 18.7, 23.8 and 36.5ghz. the retrieval errors increase from ？0.5 to ？1.7kg/m2 for v and from ？0.02 to ？0.06 kg/m2 for q with the increase of c from 0.0-0.3 to 0.7-1.0. the algorithms were used to retrieve v, q and c in the okhotsk sea from the tbs measured by amsr-e