| 摘要: |
| 利用Cryosat-2数据计算南海高空间分辨率高精度重力异常,对Cryosat-2 level 2 SIR_GDR-2A数据进行轨迹分析和交叉点分析。基于测高数据集(第1～4周期),借助加权最小范数最小二乘解计算网格剩余垂线偏差分量,然后计算中国南海海域(4°～24°,105°～120°)2′×2′重力异常。结果表明,Cryosat-2数据轨迹密度高且分布均匀规则,交叉点不符值均方根值为15.9 cm,略高于同步时间段的Jason-2 GDR数据。与船测重力相比,中国南海海域(4°～24°,105°～120°)2′×2′重力异常误差为4.5×10-5 m·s-2。 |
| 关键词: 卫星测高 Cryosat-2 逆Vening-Meinesz公式 重力异常 |
| DOI：10.3969/j.issn.1673-5005.2015.03.009 |
| 分类号::P 228.3 |
| 基金项目:海洋公益性行业科研专项(201305032)；中欧龙计划合作项目(ID.10466) |
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| Calculation and analysis of 2′×2′ gravity anomalies over the South China Sea based on Cryosat-2 satellite altimeter data |
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WAN Jianhua1, LI Jiajun1, LIU Shanwei1, YANG Jungang2
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(1.School of Geosciences in China University of Petroleum, Qingdao 266580, China;2.First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China)
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| Abstract: |
| The gravity anomaly of the South China Sea was calculated with high spatial resolution and precision using the Cryosat-2 data. The tracks and crossover points of the Cryosat-2 satellite altimetry level 2 SIR_GDR_2A data were analyzed. The component of grid residual vertical deflection was calculated with the weighted minimum least squares solution method using the cycle1-cycle4 data, then the gravity anomalies in 2′×2′ grid over the South China Sea between 4°-24° latitude and 105°-120° longitude were determined. The results show that the Cryosat-2 data have a high track density, and are distributed regularly and uniformly with a 15.9 cm RMS value of crossover point differences, which is slightly higher than the synchronous Jason-2 GDR data. Compared with the post-processed shipboard gravimetry, the root mean square value of the gravity anomaly in 2′×2′ grid over the South China Sea is 4.5×10-5 m·s-2. |
| Key words: satellite altimetry Cryosat-2 inverse Vening-Meinesz formula gravity anomaly |
