| Liu Qiankun,Xu Ke,Jiang Maofei,Wang Jiaming. 2020. Preliminary marine gravity field from HY-2A/GM altimeter data. Acta Oceanologica Sinica, 39(7):127－134 |
| Preliminary marine gravity field from HY-2A/GM altimeter data |
| HY-2A/GM高度计数据反演的初步海洋重力场 |
| Received:October 22, 2019 |
| DOI：10.1007/s13131-020-1610-4 |
| Key words:HY-2A radar altimeter geodetic mission marine gravity anomaly inversion |
| 中文关键词: HY-2A 雷达高度计 大地测量任务 海洋重力异常 反演 |
| 基金项目:The National Natural Science Foundation of China under contract No. 41906199; the Youth Innovation Project of National Space Science Center of Chinese Academy of Sciences under contract No. E0PD40012S. |
| Author Name | Affiliation | E-mail | | Liu Qiankun | The CAS Key Laboratory of Microwave Remote Sensing, National Space Science Center, Chinese Academy of Sciences (CAS), Beijing 100190, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | Xu Ke | The CAS Key Laboratory of Microwave Remote Sensing, National Space Science Center, Chinese Academy of Sciences (CAS), Beijing 100190, China | xuke@mirslab.cn | | Jiang Maofei | The CAS Key Laboratory of Microwave Remote Sensing, National Space Science Center, Chinese Academy of Sciences (CAS), Beijing 100190, China | | | Wang Jiaming | The CAS Key Laboratory of Microwave Remote Sensing, National Space Science Center, Chinese Academy of Sciences (CAS), Beijing 100190, China
University of Chinese Academy of Sciences, Beijing 100049, China | |
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| Abstract: |
| HY-2A (Haiyang-2A), launched in 2011, is the first ocean dynamic environment satellite of China and is equipped with a radar altimeter as one of the primary payloads. HY-2A shifted the drift orbit in March 2016 and has been accumulating geodetic mission (GM) data for more than three years with 168-day cycle. In this paper, we present the preliminary gravity field inverted by the HY-2A/GM data from March 2016 to December 2017 near Taiwan (21°–26°N, 119°–123°E). The gravity anomaly is computed by Inverse Vening Meinesz (IVM) formula with a one-dimensional FFT method during remove-restore procedure with the EGM2008 gravity model as the reference field. For comparison, CryoSat-2 altimeter data are used to inverse the gravity field near Taiwan Island by the same method. Comparing with the gravity field derived from CryoSat-2, a good agreement between the two data sets is found. The global ocean gravity models and National Geophysical Data Center (NGDC) shipboard gravity data also are used to assess the performance of HY-2A/GM data. The evaluations show that HY-2A and CryoSat-2 are at the same level in terms of gravity field recovery and the HY-2A/GM altimeter-derived gravity field has an accuracy of 2.922 mGal. Therefore, we can believe that HY-2A will be a new reliable data source for marine gravity field inversion and has the potentiality to improve the accuracy and resolution of the global marine gravity field. |
| 中文摘要: |
| 海洋二号A星（HY-2A）于2011年发射升空，是中国第一颗海洋动力环境卫星，并配备了雷达高度计作为主要载荷之一。 HY-2A于2016年3月转入漂移轨道，并且已经以168天的重访周期积累了三年以上的大地测量任务（GM）数据。本文介绍了2016年3月至2017年12月台湾附近（21°-26°N，119°-123°E）的HY-2A / GM数据反演的初步重力场。在以EGM2008模型作为参考模型的移去-恢复过程中，通过逆Vening Meinesz公式和一维FFT方法计算出了重力异常。为了进行比较，使用CryoSat-2高度计数据通过相同的方法反演台湾附近的重力场。与从CryoSat-2导出的重力场进行比较，发现两个数据集之间有很好的一致性。全球海洋重力模型和国家地球物理数据中心（NGDC）船上重力数据也被用于评估HY-2A / GM数据的性能。评估显示，HY-2A和CryoSat-2在重力场恢复方面处于同一水平，且HY-2A/GM高度计所得的重力场的精度为2.922mGal。因此，我们可以相信，HY-2A将是一种新的可靠的海洋重力场反演数据源，并具有提高全球海洋重力场的精度和分辨率的潜力。 |
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