逆大气压校正结果对海况偏差的影响

基于最小二乘法原理,利用Jason-1高度计交叉点数据分析两种逆大气压校正结果对SSB的影响。结果表明,传统IB模型校正SSH后得到的SSB模型和MOG2D模型校正SSH后得到的SSB模型在SWH,U的大部分区域内符合较好,MOG2D校正结果对于SSB的影响主要集中在SWH大于6 m和U大于10 m/s的强海况海域,最大差异值可达2.6 cm。通过计算上述强海况海域交叉点不符值的RMS,MOG2D校正结果得到的RMS相比传统IB校正结果减小1.4 mm。并且采用MOG2D校正结果的SSB可解释方差值增大3.14 cm²,说明MOG2D校正结果对于建立SSB参数模型更有效,特别在强海况海域其影响不可忽略。

Effects of Inverted Barometer Correction Results on Sea State Bias

This paper used crossover data of Jason-1 altimeter after applying the least square method to analyze the effects of two inverted barometer model correction results on sea state bias (SSB).The results demonstrated that the SSB deriving from the conventional inverted barometer model and MOG2D inverted barometer model had better consistency in most domain of significant wave height (SWH) and wind speed (U),but there existed distinct differences in such strong sea state as SWH>6 m,U>10 m/s,and the maximum was 2.6 cm.The RMS of crossover differences in the certain strong sea state domain was calculated,and the value of MOG2D correction result was smaller of 1.4 mm than the convention IB correction result.Besides,the explained variance of SSB derived from MOG2D Model was larger of 3.14 cm2 than the convention IB Model.Therefore,MOG2D correction result is more effective than the conventional IB model to establish SSB parametric model and its effects in the strong sea state cannot be neglected.