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首页> 外文会议>Remote Sensing of the Marine Environment; Proceedings of SPIE-The International Society for Optical Engineering; vol.6406 >Improved satellite altimetry for the observation of coastal ocean dynamics: a case study for the Northern Indian Ocean
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Improved satellite altimetry for the observation of coastal ocean dynamics: a case study for the Northern Indian Ocean

机译：改进的卫星测高仪，用于观测沿海海洋动态：以北印度洋为例

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摘要

The coastal currents in the Northern Indian Ocean are believed to play a prominent role in the heat and salt exchanges between Arabian Sea and Bay of Bengal. Hence it appears timely to carefully monitor their structure and variability at all timescales from intraseasonal to interannual. The objective of this study is to determine to what extent the sea surface height (SSH) variability associated to these coastal processes can be observed with satellite altimetry, in the Northern Indian ocean sector. Indeed, radar altimetry, which allows to measure SSH at centimetric accuracy, has been shown to be a powerful tool to obtain a wealth of information about open-ocean dynamics. Unfortunately, today, the use of standard satellite altimetric products in coastal zones remains challenging. This study explores a newly released coastal altimetric dataset, obtained from a complete reprocessing of the Topex/Poseidon data. We first present an objective method to derive geostrophic current from the raw SSH. Then we present the validation of the altimetric SSH against in situ observations. Finally we briefly analyze the observed variability of the East India Coastal Current at various timescales.
机译：据信，北印度洋的沿海水流在阿拉伯海与孟加拉湾之间的热和盐交换中起着重要作用。因此，从季节内到年际，在所有时间尺度上仔细监测它们的结构和变异性似乎是及时的。这项研究的目的是确定在北印度洋海域的卫星测高法可以观测到与这些沿海过程相关的海面高度（SSH）变化的程度。确实，雷达测高仪可以以厘米级的精度测量SSH，已被证明是获取大量有关开放海洋动力学信息的强大工具。不幸的是，今天，在沿海地区使用标准卫星高度计仍然具有挑战性。这项研究探索了一个新发布的沿海高空数据集，该数据集是通过对Topex / Poseidon数据进行完全重新处理而获得的。我们首先提出一种从原始SSH导出地转流的客观方法。然后，我们针对现场观测结果提出了高空SSH的验证。最后，我们简要分析了东印度沿海海流在不同时间尺度上观测到的变化。

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