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On performance of CryoSat-2 altimeter data in deriving marine gravity over the Bay of Bengal

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Abstract

CryoSat-2 was launched successfully in April 2010 and thus has long exceeded its design life, so it is necessary to assess the reliability of gravity anomalies derived from CryoSat-2 altimeter data beyond its nominal lifetime. CryoSat-2 altimeter data in four different periods is used to derive 1′ × 1′ gravity anomalies within the Bay of Bengal (BOB) and its adjoining areas (80°–100°E, 0°–23°N). The accuracies of gravity anomalies in different periods are assessed in comparison with processed ship-borne gravity anomalies, revealing that the gravity anomalies derived from CryoSat-2 altimetry data in different periods have similar accuracies. The amount of geodetic mission data acquired by the CryoSat-2 altimeter exceeds that recorded by all other altimeters. Thus, we determine the gravity anomalies within the BOB and adjoining areas by using data from January 2011 to May 2020 to evaluate the gravity anomaly derivation performance of all available CryoSat-2 altimeter data, and establish the 1′ × 1′ BOBGA1.0 marine gravity model. In this work, the performance of BOBGA1.0 at different distances from the coast and at different water depths is evaluated by comparisons with ship-borne gravity anomalies and the SIO V28.1 marine gravity model. The role of CryoSat-2 in deriving gravity anomalies is further assessed by a comparison with other satellite altimeters. We conclude that CryoSat-2 altimetry data can reliably be used to derive gravity anomalies and that high-resolution and high-accuracy CryoSat-2 altimetry data play a major role in gravity anomaly derivation worldwide.

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Data availability

The data presented in this study are available on request from the corresponding author.

Code availability

The code presented in this study are available on request from the corresponding author.

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Acknowledgements

We are highly grateful to AVISO for providing the CryoSat-2 altimeter data, and NCEI for providing ship-borne gravity. We are also thankful to Professors Sandwell and Smith for the global marine gravity model V28.

Funding

This study was supported by the National Natural Science Foundation of China (Grant Nos. 41774001, 41874091), SDUST Research Fund (Grant No. 2014TDJH101), and Autonomous and Controllable Special Project for Surveying and Mapping of China (Grant No. 816-517).

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Authors and Affiliations

  1. College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao, 266590, China

    Hui Ji, Xin Liu, Chengcheng Zhu, Jiajia Yuan & Jinyun Guo

  2. Department of Navigation Engineering, Naval University of Engineering, Wuhan, 430033, China

    Bing Ji

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  1. Hui Ji
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  2. Xin Liu
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  3. Chengcheng Zhu
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  4. Jiajia Yuan
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  5. Bing Ji
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Contributions

Conceptualization, XL, BJ and JG; Data curation, CZ and JY; Funding acquisition, XL and JG; Investigation, HJ, XL, CZ and JY; Methodology, HJ and XL; Project administration, XL and JG; Resources, HJ and JY; Software, HJ, CZ and JY; Supervision, XL, BJ and JG.; Validation, CZ, YY and BJ; Writing—original draft, HJ.; Writing—review & editing, HJ, CZ and JG. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Xin Liu or Jinyun Guo.

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Ji, H., Liu, X., Zhu, C. et al. On performance of CryoSat-2 altimeter data in deriving marine gravity over the Bay of Bengal. Mar Geophys Res 42, 39 (2021). https://doi.org/10.1007/s11001-021-09461-x

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