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首页> 外文期刊>Journal of oceanography >Comparisons of sea surface height variability observed by pressure-recording inverted echo sounders and satellite altimetry in the Kuroshio Extension
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Comparisons of sea surface height variability observed by pressure-recording inverted echo sounders and satellite altimetry in the Kuroshio Extension

机译：通过黑潮延伸段中的压力记录倒置回波测深仪和卫星测高仪观察到的海面高度变化的比较

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Satellite-measured along-track and gridded sea surface height (SSH) anomaly products from AVISO are compared with in situ SSH anomaly measurements from an array of 43 pressure-recording inverted echo sounders (PIESs) in the Kuroshio Extension. PIESs measure bottom pressure (P_(bot)) and round-trip acoustic travel time from the sea floor to the sea surface (t). The P_(bot) and t measurements are used to estimate, respectively, the mass-loading and steric height variations in SSH anomaly. All comparisons are made after accurate removal of tidal components from all data. Overall good correlations are found between along-track and PIES-derived SSH anomalies with mean correlation coefficient of 0.97. Comparisons between the two measurements reveal that the mass-loading component estimated from P_(bot) is relatively small in this geographical region. It improves regression coefficients about 5 % and decreases mean root-mean-squared (rms) differences from 7.8 to 6.4 cm. The AVISO up-to-date gridded product, which merges all available satellite measurements of Jason-1, Envisat, Geosat Follow-On, and TOPEX/Poseidon interlaced, shows better correlations and smaller rms differences than the AVISO reference gridded product, which merges only Jason-1 and Envisat. Especially, the up-to-date gridded product reveals 6.8 cm rms improvement on average at sites away from Jason-1 ground tracks. Gridded products exhibit low correlation (0.75-0.9) with PIES- derived SSH in a subregion where the SSH fluctuations have relatively high energy at periods shorter than 20 days.
机译：将来自AVISO的卫星测量的沿轨和网格化海面高度（SSH）异常产品与黑潮扩展中43个压力记录的反向回波测深仪（PIES）阵列的现场SSH异常测量结果进行了比较。 PIES测量底部压力（P_（bot））和从海底到海面的往返声学传播时间（t）。 P_（bot）和t测量分别用于估计SSH异常中的质量负载和空间高度变化。从所有数据中准确删除潮汐成分后，进行所有比较。在沿轨和PIES派生的SSH异常之间发现总体良好的相关性，平均相关系数为0.97。两次测量之间的比较表明，根据P_（bot）估算的质量载荷分量在该地理区域中相对较小。它可以将回归系数提高5％左右，并将均方根（rms）差异从7.8 cm减少到6.4 cm。与合并的AVISO参考网格产品相比，合并了Jason-1，Envisat，Geosat Follow-On和TOPEX / Poseidon隔行扫描的所有可用卫星测量结果的AVISO最新网格产品显示了更好的相关性和更小的均方根值只有Jason-1和Envisat。尤其是，最新的网格产品在远离Jason-1地面轨道的站点平均显示6.8厘米rms的改善。网格产品与PIES衍生的SSH在一个小于20天的时期内SSH波动具有相对较高能量的子区域显示出较低的相关性（0.75-0.9）。

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