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

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Abstract

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 1 Hz 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 2.8 mm. 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 0.8 mm, which demonstrates that the HY-2A satellite can contribute high-precision precipitable water vapor measurements to weather and atmospheric studies.

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Acknowledgements

We would like to thank the National Satellite Ocean Application Service for providing the HY-2A data and South China Sea Institute of Oceanology for the research vessel cruise. Dr. Liwen Dai and Dr. Xianglin Liu contributed the NavCom and Fugro PPP results, respectively. This study is supported by National Natural Science Foundation of China (Grant No. 41876106) and Basic Scientific Fund for National Public Research Institutes of China (2018Q04). Mr. Zhilu Wu is financially supported by China Scholarship Council (CSC. File No. 201706710115).

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Authors and Affiliations

  1. First Institute of Oceanography, Ministry of Natural Resources, Qingdao, 266061, China

    Yang Liu, Yanxiong Liu, Guanxu Chen & Zhilu Wu

  2. School of Geodesy and Geomatics, Wuhan University, Wuhan, 430079, China

    Guanxu Chen

  3. School of Earth Sciences and Engineering, Hohai University, Nanjing, 211100, China

    Zhilu Wu

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  1. Yang Liu
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Liu, Y., Liu, Y., Chen, G. et al. Evaluation of HY-2A satellite-borne water vapor radiometer with shipborne GPS and GLONASS observations over the Indian Ocean. GPS Solut 23, 87 (2019). https://doi.org/10.1007/s10291-019-0876-5

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