Evaluation of HY-2A satellite-borne water vapor radiometer with shipborne GPS and GLONASS observations over the Indian Ocean

Evaluation of HY-2A satellite-borne water vapor radiometer with shipborne GPS and GLONASS observations over the Indian Ocean
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印度洋上空 HY-2A 星载水汽辐射计与船载 GPS 和 GLONASS 观测的评估

DOI:
10.1007/s10291-019-0876-5
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发表时间:
2019-06
期刊:
影响因子:
4.9
通讯作者:
Zhilu Wu
Zhilu Wu
中科院分区:
工程技术1区
文献类型:
--
作者:
Yang Liu;Yanxiong Liu;Guanxu Chen;Zhilu Wu

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中国“海洋- 2a”(HY-2A)测高卫星配备了一个校准微波辐射计(CMR),用于校正雷达测高观测中的大气水汽路径延迟。为了评估星载CMR,我们利用船载GPS和GLONASS在印度洋进行了为期两个月的巡航,获取了1Hz高频可降水量(PWV)。这种对星载辐射计进行的公海评估不受沿海土地造成的卫星足迹污染的影响,这种污染不可避免地发生在陆基或沿海站。分析了船载GNSS运动精确点定位检索的PWV估计和误差,并与cmr检索的PWV进行了比较。结果表明,舰载GNSS运动精确点定位可获得不确定度约为2.8mm的船舶PWV。当HY-2A星下点与船舶交叉时,HY-2A cmr反演的PWV值与GNSS PWV值吻合较好,差值约为0.8mm,说明HY-2A卫星可以为气象和大气研究提供高精度的可降水量测量。
The Chinese Haiyang-2A (HY-2A) altimetry satellite is equipped with a calibration microwave radiometer (CMR) for correcting atmospheric water vapor path delay in radar altimeter observations. To evaluate the satellite-borne CMR, we retrieved 1Hz high-frequency precipitable water vapor (PWV) using shipborne GPS and GLONASS from a two-month cruise in the Indian Ocean. This open-sea evaluation of the satellite-borne radiometer is free of the contamination of the satellite footprints induced by coastal lands, which occurs inevitably in ground-based or coastal stations. The estimates and errors of the retrieved PWV from shipborne GNSS kinematic precise point positioning were analyzed and then compared to the CMR-retrieved PWV. The results show that the shipborne GNSS kinematic precise point positioning can obtain marine PWV with an uncertainty of about 2.8mm. When the HY-2A sub-satellite point and the ship cross, the HY-2A CMR-retrieved PWV is in good agreement with the GNSS PWV with the difference of about 0.8mm, which demonstrates that the HY-2A satellite can contribute high-precision precipitable water vapor measurements to weather and atmospheric studies.
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