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Validation of the “HY-2” altimeter wet tropospheric path delay correction based on radiosonde data
作者姓名:WANG Jin  ZHANG Jie  FAN Chenqing  WANG Jing
作者单位:Ocean University of China, Qingdao 266003, China;Qingdao University, Qingdao 266071, China;The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Ocean University of China, Qingdao 266003, China
基金项目:The Marine Public Welfare Project of China under contract No. 201105032-1; the National High-Tech Project of China under contract No. 2013AA09A505.
摘    要:Wet tropospheric path delay (PD) is a highly variable term for the altimeter measurement of a sea surface height, caused by the refraction effect of atmospheric water vapor and cloud liquid water. In order to esti- mate PD values, the "HY-2" system includes a calibration microwave radiometer (CMR) operating at 18.7, 23.8 and 37 GHz. The PD data of the CMR were compared and validated by coincident radiosonde profiles from ten globally distributed radiosonde stations during October 2011 to August 2012. The temporal interval was 1 h. In order to avoid land contamination, different spatial intervals between these two data sets were tested. The empirical fit function of PD uncertainty and spatial interval was found and extrapolated to the ideal situation that the data of CMR and radiosonde were totally coincident. The stability of the brightness temperature of the CMR and its impact on the PD correction was also studied. Consequently, the uncertainty of the PD algorithm of the CMR was estimated to be 2.1 cm.

关 键 词:路径延迟  探空资料  对流层  校正  验证  高度表  PD算法  无线电探空仪
收稿时间:3/5/2013 12:00:00 AM
修稿时间:2013/10/25 0:00:00

Validation of the “HY-2” altimeter wet tropospheric path delay correction based on radiosonde data
WANG Jin,ZHANG Jie,FAN Chenqing,WANG Jing.Validation of the “HY-2” altimeter wet tropospheric path delay correction based on radiosonde data[J].Acta Oceanologica Sinica,2014,33(5):48-53.
Authors:WANG Jin  ZHANG Jie  FAN Chenqing and WANG Jing
Affiliation:1.Ocean University of China, Qingdao 266003, China;Qingdao University, Qingdao 266071, China2.The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China3.Ocean University of China, Qingdao 266003, China
Abstract:Wet tropospheric path delay (PD) is a highly variable term for the altimeter measurement of a sea surface height, caused by the refraction effect of atmospheric water vapor and cloud liquid water. In order to estimate PD values, the "HY-2" system includes a calibration microwave radiometer (CMR) operating at 18.7, 23.8 and 37 GHz. The PD data of the CMR were compared and validated by coincident radiosonde profiles from ten globally distributed radiosonde stations during October 2011 to August 2012. The temporal interval was 1 h. In order to avoid land contamination, different spatial intervals between these two data sets were tested. The empirical fit function of PD uncertainty and spatial interval was found and extrapolated to the ideal situation that the data of CMR and radiosonde were totally coincident. The stability of the brightness temperature of the CMR and its impact on the PD correction was also studied. Consequently, the uncertainty of the PD algorithm of the CMR was estimated to be 2.1 cm.
Keywords:path delay  "HY-2" satellite  radiosonde  microwave radiometer  brightness temperature
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