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| 基于近30 a多源卫星高度计数据的东中国海潮汐信息提取 |
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李谦慧1, 何宜军1,2, 李秀仲1,2,3
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1.南京信息工程大学 海洋科学学院, 江苏 南京 210044;2.自然资源部空间海洋遥感与应用重点实验室, 北京 100081;3.南京信大安全应急管理研究院有限公司, 江苏 南京 210044
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| 摘要: |
| 我国HY-2B卫星已成功运行3 a多,本文首次将HY-2B测高数据用于计算潮汐。将HY-2B与相同时间段的Jason-3在东中国海分别进行潮汐信息提取,验证了其结果的一致性。建立了基于10颗国内外卫星高度计(TOPEX/Poseidon、Jason-1、Jason-2、Jason-3、ENVISAT、ERS-1、ERS-2、Sentinel-3A、Sentinel-3B、HY-2B)数据的时间序列,得到东中国海近30 a时间序列的较高空间分辨率网格化海面高度。利用该数据提取了东中国海12个分潮(O1、K1、Q1、P1、M2、S2、N2、K2、SA、SSa、Mm、Mf)的潮汐调和常数,并将4个主要分潮M2、S2、K1、O1的调和常数与验潮站进行对比,均方根误差分别为6.74 cm、3.98 cm、2.37 cm、1.81 cm,总体均方根误差为8.32 cm;同时,采用除HY-2B之外的剩余9颗国外卫星高度计数据和TPXO9潮汐模型结果分别与验潮站对比,结果显示,加入HY-2B后的10颗卫星高度计反演潮汐结果准确度最高,与不使用HY-2B卫星数据相比,全日潮有较大改善,K1和O1向量均方根误差分别降低19.93%和17.35%,4个主要分潮总体均方根误差降低3.5%。此外,通过与FVCOM模式结果对比分析,4个主要分潮的调和常数与模式结果的总体均方根误差为8.86 cm。另一方面,空间分辨率也有所提高,达到了0.1°×0.1°。最后,给出了4个主要分潮同潮图。在潮差较大的朝鲜半岛西侧,加入HY-2B后的同潮图可显示出2.1 m的M2等振幅线与0.75 m的S2等振幅线,与该海域实际观测结果一致,说明HY-2B在近海潮汐信息提取中有相当重要的作用。 |
| 关键词: 多源卫星高度计 东中国海 潮汐调和分析 均方根误差 |
| DOI：10.11759/hykx20220121002 |
| 分类号:P733 |
| 基金项目:新概念雷达海洋动力参数遥感基础理论及应用研究(41620104003);国家卫星海洋应用中心海洋卫星业务应用项目“中国近海潮汐数据处理软件研制”;国家自然科学基金青年基金(41706202);江苏省研究生科研与实践创新计划项目SJKY19_0951 |
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| Tidal information extraction in the East China Sea based on multisource satellite altimeter data in approximately 30 years |
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LI Qian-hui1, HE Yi-jun1,2, LI Xiu-zhong1,2,3
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1.School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, China;2.Key Laboratory of Space Ocean Remote Sensing and Applications, National Satellite Ocean Application Service, Beijing 100081, China;3.Nanjing Xinda Institute of Safety and Emergency Management, Nanjing 210044, China
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| Abstract: |
| The HY-2B satellite of China has been in operation for more than three years. In this study, the HY-2B altimetry data are used to analyze tides for the first time. First, the tidal information of the East China Sea obtained from HY-2B and Jason-3 in the same period is extracted, and the consistency of the results is verified. Then, the time series of ten satellite altimeter data (i.e., TOPEX/Poseidon, Jason-1, Jason-2, Jason-3, ENVISAT, ERS-1, ERS-2, Sentinel-3A, Sentinel-3B, and HY-2B) is established to obtain the high spatial–resolution gridded sea surface height of the East China Sea in approximately 30 years. Using those data, 12 constituents (i.e., O1, K1, Q1, P1, M2, S2, N2, K2, SA, SSa, Mm, and Mf) in the East China Sea are extracted using the tidal harmonic analysis method. Moreover, the harmonic constants of four major constituents (i.e., M2, S2, K1, and O1) are compared with those of the tide gage stations. The root mean square errors of M2, S2, K1, and O1 are 6.74, 3.98, 2.37, and 1.81 cm, respectively, and the overall root mean square error is 8.3177 cm. At the same time, nine satellite altimeter data, except for the HY-2B data and TPXO9 tide model results, are compared with the results of the tide gage stations. Results showed that the tidal inversion results of ten satellite data, including the HY-2B altimeter data, are highly accurate. These results indicate a considerable improvement in the diurnal tide compared with not using the HY-2B satellite data. The root mean square error of the K1 and O1 constituents decreased by 19.93% and 17.35%, respectively. The overall root mean square error of the four main tidal components decreased by 3.5%. Furthermore, compared with the results of the FVCOM model, the overall root mean square error is 8.86 cm for the harmonic constant results of the four main tidal components. The spatial resolution is also improved to 0.1°×0.1°.Finally, the four major cotidal charts in the East China Sea are given. The tidal range on the west side of the Korean Peninsula is large. The cotidal charts obtained by adding HY-2B can show the 2.1-m M2 iso-amplitude line and 0.75-m S2 iso-amplitude line, which is consistent with the actual observation results in this sea area. Furthermore, the HY-2B satellite altimeter data have a significant role in offshore tidal information extraction. |
| Key words: multisource satellite altimeter East China Sea tidal harmonic analysis root mean square |
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