Improving High-Frequency Marine Gravity Anomaly Recovery: The Efficacy of SWOT Wide-Swath Altimetry

被引:0
作者
Wang, Jianbo [1 ,2 ]
Xu, Yongsheng [3 ,4 ,5 ]
Zhang, Qingjun [6 ]
Wang, Yan [7 ]
Zhu, Chengcheng [8 ]
Xu, Huan [9 ]
Zhang, Liqiang [6 ]
机构
[1] Jiangsu Ocean Univ, Sch Marine Technol & Geomat, Lianyungang 222005, Peoples R China
[2] Jiangsu Marine Resources Dev Inst, Lianyungang 222005, Peoples R China
[3] Chinese Acad Sci, Inst Oceanol, Ctr Ocean Mega Sci, Lab Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China
[4] Lab Ocean & Climate Dynam, Laoshan Lab, Qingdao 266237, Peoples R China
[5] Univ Chinese Acad Sci, Coll Marine Sci, Beijing 100049, Peoples R China
[6] Chinese Acad Space Technol, Inst Remote Sensing Satellite, Beijing 100094, Peoples R China
[7] Jiangsu Ocean Univ, Sch Marine Technol & Geomat, Lianyungang 222005, Peoples R China
[8] Shandong Jianzhu Univ, Sch Surveying & Geoinformat, Jinan 250101, Peoples R China
[9] Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
基金
中国国家自然科学基金;
关键词
Gravity; Accuracy; Satellites; Altimetry; Surface topography; Sea surface; Noise; CryoSat-2; data; inverse Vening-Meinesz (IVM) method; marine gravity in high frequency; shipborne gravimetry; SWOT L2 KaRIn beta data;
D O I
10.1109/LGRS.2024.3431694
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
For the traditional 1-D nadir altimetry measurements, the spatial resolution of the sea surface height (SSH) measurements is restricted. However, the new wide-swath altimeters like Surface Water and Ocean Topography (SWOT) are anticipated to enhance spatial resolution and thereby improve the accuracy of derived marine gravity anomalies, particularly in high-frequency signals. The study investigates the efficacy of L2 KaRIn Beta data of SWOT in recovering high-frequency marine gravity signals. CryoSat-2 data was used for comparison. The first-order difference of shipborne gravity data along ship tracks was used as the reference to investigate the high-frequency accuracy of gravity derived from SWOT and CryoSat-2 at different point spacings, respectively. The research results show that compared to CryoSat-2 satellite data, when the point spacing is less than 2 km or greater than 6 km, the accuracy improvement is relatively small, less than 3.0%. However, within the 2-4 km range, the accuracy improvement ranges from 6.8% to 7.9%. When the point spacing is between 4 and 6 km, the accuracy improvement ranges from 5.0% to 6.7%. Therefore, when the point spacing is greater than 2 km and less than 6 km, the accuracy improvement is obvious. The results show that SWOT wide-range altimeter satellite has obviously improved the accuracy of traditional altimeter gravity inversion in high frequency (especially in the range of 2-6 km).
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页数:5
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