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首页> 外文期刊>Marine Geodesy >TOPEX/Poseidon and Jason Equatorial Sea Surface Slope Anomaly in the Atlantic in 2002: Comparison with Wind and Current Measurements at 23W
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TOPEX/Poseidon and Jason Equatorial Sea Surface Slope Anomaly in the Atlantic in 2002: Comparison with Wind and Current Measurements at 23W

机译：2002年大西洋地区的TOPEX / Poseidon和Jason赤道海面坡度异常：与23W风和电流测量值的比较

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摘要

A time series of velocity profile in the upper 150 m of the equatorial Atlantic was gathered at 23 W in 2002 within the PIRATA program. It constitutes the first time series of near surface current measurements simultaneous with altimetric data in the equatorial Atlantic. The surface slope anomaly along the equator is computed from satellite altimetry, and, as a proxy for the pressure gradient along the equator, compared with the wind and near surface current data. In a first step, a time series of the surface slope anomaly along the equator in the Atlantic is computed from the 10-year-long TOPEX/Poseidon sea level anomalies. A sensitivity study establishes the robustness of the calculation. Apart from a 15 cm bias, the equatorial sea surface slope anomalies estimated either from TOPEX/Poseidon or from Jason over the 6-month overlap (Feb.-Aug. 2002) do not reveal drastic differences. We produce two sea surface slope anomaly composite time series for 2002 (one with T/P data, the other with Jason data during the commissioning phase) and compare them to the wind and velocity data at 23W. As expected, the near surface velocity and depth of the upper limit of the equatorial undercurrent (EUC) are extremely well correlated with the surface pressure gradient anomaly. 10-year-long time series of altimetry-derived zonal sea surface slope anomaly and ECMWF ERA40 wind stress are also well correlated. They exhibit similar spectral content and similar anomalous years. This is a first step towards a full analysis of the EUC dynamics using altimetry, PIRATA data (near surface current and subsurface thermohaline structure) and model. These initial comparisons reinforce the utility of Jason measurements for continuing the 10-year and highly accurate TOPEX/Poseidon time series for study of equatorial signals.
机译：在2002年的PIRATA计划中，赤道大西洋上部150 m处的速度剖面的时间序列为23W。它构成了近地表电流测量的第一时间序列，同时与赤道大西洋的高空数据同时进行。沿赤道的表面坡度异常是根据卫星测高法计算得出的，并与风和近地表电流数据进行比较，作为沿赤道的压力梯度的代表。第一步，根据10年的TOPEX / Poseidon海平面距平计算出大西洋沿赤道的表面倾斜距平的时间序列。敏感性研究确定了计算的稳健性。除了15 cm的偏差外，根据TOPEX / Poseidon或Jason在6个月的重叠过程中（2002年2月至8月）估算的赤道海面坡度异常没有显示出明显的差异。我们生成了2002年的两个海面坡度异常复合时间序列（一个包含T / P数据，另一个包含在调试阶段的Jason数据），并将它们与23W时的风速数据进行了比较。正如预期的那样，赤道暗流（EUC）上限的近地表速度和深度与地表压力梯度异常非常相关。源自海拔高度的纬向海面倾斜异常的10年时间序列与ECMWF ERA40风应力也具有很好的相关性。它们表现出相似的光谱含量和相似的异常年份。这是迈向使用高度计，PIRATA数据（近地表电流和地下热盐结构）和模型全面分析EUC动力学的第一步。这些初步的比较加强了Jason测量的实用性，可以继续使用10年的高精度TOPEX / Poseidon时间序列来研究赤道信号。

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