For Microwave Humidity and Temperature sounder(MWHTS) measurements over the ocean, a cloud filtering method is presented to filter out cloud-and precipitation-affected observations by analyzing the sensitivity of the ...For Microwave Humidity and Temperature sounder(MWHTS) measurements over the ocean, a cloud filtering method is presented to filter out cloud-and precipitation-affected observations by analyzing the sensitivity of the simulated brightness temperatures of MWHTS to cloud liquid water, and using the root mean square error(RMSE)between observation and simulation in clear sky as a reference standard. The atmospheric temperature and humidity profiles are retrieved using MWHTS measurements with and without filtering by multiple linear regression(MLR),artificial neural networks(ANN) and one-dimensional variational(1DVAR) retrieval methods, respectively, and the effects of the filtering method on the retrieval accuracies are analyzed. The numerical results show that the filtering method can improve the retrieval accuracies of the MLR and the 1DVAR retrieval methods, but have little influence on that of the ANN. In addition, the dependencies of the retrieval methods upon the testing samples of brightness temperature are studied, and the results show that the 1DVAR retrieval method has great stability due to that the testing samples have great impact on the retrieval accuracies of the MLR and the ANN, but have little impact on that of the 1DVAR.展开更多
A single-channel (9.5 mm) airborne microwaveradiometer with one antenna is developed. The retrievalmethods and primary observation results of cloud liquidwater and super-cooled cloud liquid water are discussed. Theair...A single-channel (9.5 mm) airborne microwaveradiometer with one antenna is developed. The retrievalmethods and primary observation results of cloud liquidwater and super-cooled cloud liquid water are discussed. Theaircraft experiments show that the cloud liquid water andsuper-cooled liquid water can be sensitively monitored atsome level of accuracy by the radiometer. The results ofcloud liquid water content are reasonable and correspondwell with the surface radar echo intensity. The design of theairborne radiometer and its retrieval methods are feasible,giving it application value.展开更多
基金Key Fostering Project of National Space Science Center,Chinese Academy of Sciences(Y62112f37s)National 863 Project of China(2015AA8126027)
文摘For Microwave Humidity and Temperature sounder(MWHTS) measurements over the ocean, a cloud filtering method is presented to filter out cloud-and precipitation-affected observations by analyzing the sensitivity of the simulated brightness temperatures of MWHTS to cloud liquid water, and using the root mean square error(RMSE)between observation and simulation in clear sky as a reference standard. The atmospheric temperature and humidity profiles are retrieved using MWHTS measurements with and without filtering by multiple linear regression(MLR),artificial neural networks(ANN) and one-dimensional variational(1DVAR) retrieval methods, respectively, and the effects of the filtering method on the retrieval accuracies are analyzed. The numerical results show that the filtering method can improve the retrieval accuracies of the MLR and the 1DVAR retrieval methods, but have little influence on that of the ANN. In addition, the dependencies of the retrieval methods upon the testing samples of brightness temperature are studied, and the results show that the 1DVAR retrieval method has great stability due to that the testing samples have great impact on the retrieval accuracies of the MLR and the ANN, but have little impact on that of the 1DVAR.
文摘A single-channel (9.5 mm) airborne microwaveradiometer with one antenna is developed. The retrievalmethods and primary observation results of cloud liquidwater and super-cooled cloud liquid water are discussed. Theaircraft experiments show that the cloud liquid water andsuper-cooled liquid water can be sensitively monitored atsome level of accuracy by the radiometer. The results ofcloud liquid water content are reasonable and correspondwell with the surface radar echo intensity. The design of theairborne radiometer and its retrieval methods are feasible,giving it application value.
