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Sea Surface Heights and Marine Gravity Determined from SARAL/AltiKa Ka-band Altimeter Over South China Sea

机译:海面高度和海洋重力从南海南海的Saral / Altika Ka Band高度测定

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摘要

SARAL/AltiKA (SRL) is the first altimetry satellite with a Ka-band altimeter. To validate the advantages of the Ka-band altimeter over traditional Ku-band altimeters in marine geodetic applications, a comprehensive analysis is carried out over the South China Sea (SCS) (0-30 degrees N, 105-125 degrees E) from three aspects, namely the influence of load on waveforms, the precision of sea surface heights (SSHs), and the precision of altimeter-derived marine gravity field. Coastal waveforms of SRL, Jason-2, and CryoSat-2 are separately compared with corresponding ocean-type waveforms. The radius of coastal influence on SSHs of SRL/exact repeat mission (SRL/ERM) is the smallest, being about 3 km. Crossover discrepancies, global mean sea surface models, and tide gauge data are used to assess the precision of altimetric SSHs. Compared with the SSH precision of Ku-band Jason-2/ERM, the SSH precision of Ka-band SRL/ERM is 4.6% higher over the SCS and 10% higher in offshore areas. Gridded gravity anomalies are derived from measurements of SRL/drifting phase (SRL/DP) and CryoSat-2 through the inverse Vening-Meinesz formula, respectively. According to the assessment by shipborne gravity data and global marine gravity models, the precision of SRL/DP-derived gravity is higher than that of CryoSat-2-derived gravity over the SCS, especially in offshore areas. In some cycles, ground tracks of SRL/ERM have large drifting of more than 10 km from nominal tracks. The results show that the Ka-band altimeter of SRL has better precision in SSHs and marine gravity recovery than the Ku-band altimeter over the SCS, particularly in offshore areas.
机译:SARAL/AltiKA(SRL)是第一颗装有Ka波段高度计的测高卫星。为了验证Ka波段高度计在海洋大地测量应用中优于传统Ku波段高度计的优势,从三个方面对南海(0-30°N,105-125°E)进行了综合分析,即载荷对波形的影响、海面高度(SSH)的精度和高度计导出的海洋重力场的精度。分别将SRL、Jason-2和CryoSat-2的海岸波形与相应的海洋型波形进行了比较。SRL/精确重复任务(SRL/ERM)对SSHs的海岸影响半径最小,约为3km。交叉差异、全球平均海面模型和潮汐计数据用于评估高度SSH的精度。与Ku波段Jason-2/ERM的SSH精度相比,Ka波段SRL/ERM的SSH精度比SCS高4.6%,在近海地区高10%。网格重力异常分别由SRL/漂移相(SRL/DP)和CryoSat-2的测量通过Vening-Meinesz逆公式导出。根据舰载重力数据和全球海洋重力模型的评估,在南海,尤其是近海地区,SRL/DP衍生重力的精度高于CryoSat-2衍生重力。在某些循环中,SRL/ERM的地面轨道与标称轨道之间存在超过10km的大漂移。结果表明,在南海地区,尤其是近海地区,SRL的Ka波段高度计比Ku波段高度计在SSHs和海洋重力恢复方面具有更好的精度。

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