Global marine gravity anomalies recovered from multi-beam laser altimeter data of ICESat-2

doi:10.11947/j.AGCS.2024.20230207

Abstract

Abstract: Satellite altimetry is one of the crucial techniques for the recovery of marine gravity anomalies. The along-track altimeter data is commonly used, while the cross-track data from conventional altimetry missions is not used to recover marine gravity anomalies due to the long time intervals or sparse ground-track spacing, which limits the improvement of the gravity anomaly model. The ICESat-2 laser altimetry mission operates with three pairs of laser beams, each pair separated by 3 km, which provides the possibility of using the cross-track altimeter data. The cross-track data processing method is presented and global marine gravity anomaly models (named IS2Gra_alo and IS2Gra_alo_acr) are recovered from the along-track altimeter data and the combination of along-track and cross-track altimeter data, respectively. The root mean square (RMS) of the difference between IS2Gra_alo_acr and global shipborne gravity is 5.54 mGal, which is 0.16 mGal better than that of IS2Gra_alo. According to the difference between ICESat-2 gravity models and released global gravity anomaly models, the RMS derived by IS2Gra_alo_acr is at least 0.10 mGal better than that of IS2Gra_alo. The above results confirm that the accuracy of the gravity model recovered from along-track data is improved by incorporating cross-track data, and the ICESat-2 altimeter data is reliable for the recovery of global marine gravity anomalies. Additionally, the combination of different cross-track and along-track altimeter data is discussed for the accuracy of the gravity model recovered from ICESat-2. The accuracy of the gravity model is able to be improved by incorporating the appropriate cross-track altimeter data with the along-track altimeter data. This research provides a reference for the recovery of marine gravity anomalies from the future altimeter data of the SWOT altimetry mission and the two-satellite tandem mode altimetry of China.

Key words: ICESat-2, satellite laser altimetry, marine gravity anomaly, deflection of the vertical, sea surface height

CLC Number:

P228

LI Zhen, GUO Jinyun, SUN Zhongmiao, JIA Yongjun, HUANG Lingyong, SUN Heping. Global marine gravity anomalies recovered from multi-beam laser altimeter data of ICESat-2[J]. Acta Geodaetica et Cartographica Sinica, 2024, 53(2): 252-262.

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