A DUAL-FREQUENCY METHOD OF ELIMINATING LIQUID WATER RADIATION TO REMOTELY SENSE CLOUDY ATMOSPHERE BY GROUND-BASED MICROWAVE RADIOMETER

作者：Li, Jiangman^*; Guo, Lixin; Lin, Leke; Zhao, Yiyang; Zhao, Zhenwei; Shu, Tingting; Han, Hengmin

来源：Progress in Electromagnetics Research-PIER, 2013, 138: 629-645.

DOI：10.2528/PIER13010201

• TEMPERATURE
• VAPOR
• HUMIDITY
• FIELD
• RETRIEVALS
• ACCURACY
• PATH

Ground-based microwave radiometer is the main device to remotely sense atmosphere passively which can detect the water vapor density, temperature, integral water vapor, etc. Because of the influence of cloud liquid water on the brightness temperature measured by microwave radiometer, the cloud needs to be modeled to retrieve the parameters of cloudy atmosphere. However, the difference between the cloud model and actual cloud may bring on some error in retrieval. Based on the relation between absorption coefficient of liquid water and frequency, a dual-frequency method of eliminating liquid water radiation which is not based on modeling cloud is put forward to retrieve the parameters of cloudy atmosphere. Historical radiosonde data are employed in the calculation of retrieval coefficients to profile the water vapor of cloudy atmosphere. The simulation and experiment results show that the dual-frequency method can eliminate the radiation of liquid water effectively and has a higher precision than conventional method. The integral water vapor in cloudy atmosphere is also retrieved by the dual-frequency method, and the precision is comparable with the method of modeling cloud.

• 出版日期2013
• 单位西安电子科技大学