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首页> 外文期刊>Ocean Science Journal >Comparison of Measurements from Pressure-recording Inverted Echo Sounders and Satellite Altimetry in the North Equatorial Current Region of the Western Pacific
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Comparison of Measurements from Pressure-recording Inverted Echo Sounders and Satellite Altimetry in the North Equatorial Current Region of the Western Pacific

机译：基于北赤道电流区域的压力记录倒回波探测仪和卫星高度测量的比较

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摘要

An array of 5 pressure-recording inverted echo sounders (PIESs) was deployed along the Jason-2 214 ground track in the North Equatorial Current (NEC) region of the western Pacific Ocean for about 2 years from June 2012. Round-trip acoustic travel time from the bottom to the sea surface and bottom pressure measurements from PIES were converted to sea level anomaly (SLA). AVISO along-track mono-mission SLA (Mono-SLA), reference mapped SLA (Ref-MSLA), and up-to-date mapped SLA (Upd-MSLA) products were used for comparison with PIES-derived SLA (eta (tot)). Comparisons of eta (tot) with Mono-SLA revealed that hump artifact errors significantly contaminate the Mono-SLA. Differences of eta (tot) from both Ref-MSLA and Upd-MSLA decreased as the hump errors were reduced in mapped SLA products. Comparisons of Mono-SLA measurements at crossover points of ground tracks near the observation sites revealed large differences though the time differences of their measurements were only 1.53 and 4.58 days. Comparisons between Mono-SLA and mapped SLA suggested that mapped SLA smooths out the hump artifact errors by taking values between the two discrepant Mono-SLA measurements at the crossover points. Consequently, mapped SLA showed better agreement with eta (tot) at our observation sites. AVISO mapped sea surface height (SSH) products are the preferable dataset for studying SSH variability in the NEC region of the western Pacific, though some portions of hump artifact errors seem to still remain in them.
机译：沿着西太平洋北赤道电流（NEC）地区的北赤道电流（NEC）地面轨道部署了一系列5个压力记录倒回呼回声（PIES），从2012年6月开始左右2年。往返声学旅行从底部到海上表面和底部压力测量的时间转化为海平面异常（SLA）。 Aviso沿着轨道单音任务SLA（MONO-SLA），参考映射SLA（REF-MSLA）以及最新的映射SLA（UPD-MSLA）产品用于与Pies-errived SLA（ETA（Tot）进行比较）））。 ETA（TOT）与MONO-SLA的比较显示，驼峰伪影误差显着污染了单反SLA。随着映射SLA产品的驼峰误差降低，ETA（TOT）从ref-MSLA和UPD-MSLA的差异降低。观察位点附近的地面轨道交叉点的单反SLA测量的比较显示出大的差异，但其测量的时间差仅为1.53和4.58天。 Mono-SLA与映射SLA之间的比较建议，映射SLA通过在交叉点处的两种差异单SLA测量值之间取得值来平滑驼峰伪像错误。因此，映射SLA与我们观察点的ETA（TOT）更好地表明。 Aviso映射的海面高度（SSH）产品是在西太平洋的NEC地区学习SSH变异的优选数据集，尽管驼峰伪像错误似乎仍然存在。

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