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COASTAL SEA-LEVEL IN NORWAY FROM CRYOSAT-2 SAR ALTIMETRY

机译：来自Cryosat-2 SAR Altimetry的挪威沿海海平面

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Conventional altimeters determine the sea surface height with an accuracy of a few centimeters over the open ocean. Although satellite altimetry is a mature discipline, altimeter observations collected over coastal regions suffer from numerous effects which degrade their quality. The Norwegian coast adds further complications, due to many islands, mountains, and deep, narrow fjords. The European Space Agency (ESA) CryoSat-2 satellite carries a Synthetic aperture Interferometric Radar ALtimeter (SIRAL). Due to the SIRAL instrument, CryoSat-2 is able to observe closer to the coast than conventional altimeters. This motivates the current paper, in which we investigate the potential of CryoSat-2 data to provide improved observations in the Norwegian coastal zone. We make use of CryoSat-2 SARIn mode observations and determine sea surface heights at 23 tide gauges along the coast, and compare these with independent sea-level observations. Using standard CryoSat-2 geophysical (tide + IB) corrections gives a standard deviation of differences of ～15 cm with respect to tide-gauge observations. Replacing standard corrections with refined corrections using tide-gauge information suggests an improvement of ～5 cm. A special case study at the Stavanger tide-gauge shows an improvement of ～3 cm comparing CryoSat-2 sites and conventional altimeter sites with respect to the tide-gauge. These results highlight a great development of satellite altimetry in coastal zones and raises expectations for future missions such as Sentinel-3.
机译：常规高度计确定海面高度，精度在开阔的海洋上略微厘米。虽然卫星Altimetry是一个成熟的纪律，但在沿海地区收集的高度计观察患有许多效果，这会降低质量。由于许多岛屿，山脉，深，狭窄的峡湾，挪威海岸增加了进一步的并发症。欧洲航天局（ESA）Cryosat-2卫星带有合成孔径干涉雷达高度计（Siral）。由于Siral仪器，Cryosat-2能够比传统的高度计更接近海岸。这激励了目前的论文，其中我们调查了低温-2数据的潜力，以在挪威沿海地区提供改进的观察。我们利用低温素-2 Sarin模式观察，并在沿着海岸的23个潮汐仪表中确定海面高度，并将这些与独立的海平面观察结果进行比较。使用标准的低温-2地球物理（Tide + IB）校正，矫正差异的标准差异为潮汐仪表观察。使用潮汐仪表信息取代具有精细校正的标准校正表明〜5厘米的提高。 Stavanger Tide-Cauge的一个特殊案例研究表明，在潮汐计相对于潮汐计比较低温-2位点和传统的高度计站点的〜3cm的改善。这些结果突出了沿海地区的卫星高度偏移的巨大发展，并对未来的未来任务（如Sentinel-3）提高了期望。

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