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首页> 外文期刊>Advances in space research >Validation of CryoSat-2 SIRAL sea level data in the eastern continental shelf of the Gulf of Cadiz (Spain)
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Validation of CryoSat-2 SIRAL sea level data in the eastern continental shelf of the Gulf of Cadiz (Spain)

机译：验证加的斯湾（西班牙）东部大陆架上的CryoSat-2 SIRAL海平面数据

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We present the validation of sea level measurements taken over the eastern shelf of the Gulf of Cadiz (southwestern Iberian Peninsula) by the European Space Agency CryoSat-2 satellite's SIRAL altimeter in SAR mode. Time series of sea level anomaly (SLA) at 20-Hz posting rate (corresponding to approximately 350 m along the satellite track) are compared against sea level measurements from two tide gauge stations located along the Spanish coast of the study area. Due to the long repeat cycle of CryoSat-2 (369 days), data selection is performed by including all the tracks falling in a radius of 50 km from the location of the tide gauge stations. Then, time series of SLA are formed during the observational time period (August 2010-December 2014) by taking the altimeter measurements located at growing distances from the coast (1, 3, 5, 10, 15 and 20 km) as well as around four isobaths (10, 25, 50 and 75 m). The validation of AltiKa's SARAL altimeter 20-Hz data, using its two 35-day-repeat ground tracks available in the area is also presented. Overall, CryoSat-2 20-Hz SLAs selected in the coastal strip from 3 to 20 km agree well with data from the western station (Huelva) with rmse ranging from 11.4 to 6.4 cm. The analysis at the eastern station (Bonanza) yields rmse ranging from 16.8 to 14.6 cm. The comparisons made with CryoSat-2 20-Hz SLAs are in agreement with the rmse estimated using AltiKa 20-Hz SLAs at distances to the coast higher than 5 km, and much better in the 1-5 coastal band. The differences in quantity of SAR mode data observed at the two stations and in their agreement with the tide gauges can be explained by (1) the more complex coastal morphology around Bonanza station with the altimetry tracks almost parallel to the coast; (2) the noisier hydrodynamics around Bonanza station due to the presence of the estuary mouth of the Guadalquivir River; and (3) residual (uncorrected) tidal signals in the Bonanza gauge record. We conclude that the quality of SAR altimetry is comparable or even slightly better than conventional altimetry, thus qualifying SAR data for exploitation in oceanographic studies and sea level monitoring. An example is the analysis made of the surface signal due to a heavy Guadalquivir River discharge event. (C) 2017 COSPAR. Published by Elsevier Ltd. All rights reserved.
机译：我们提出了由欧洲航天局CryoSat-2卫星的SIRAL高度计在SAR模式下对加的斯湾东海岸（伊比利亚西南半岛）进行的海平面测量的验证。将以20 Hz的发布速度（对应于沿卫星航迹的大约350 m）的海平面异常（SLA）的时间序列与来自研究区域西班牙沿海两个潮汐仪站的海平面测量值进行了比较。由于CryoSat-2的重复周期很长（369天），因此通过选择所有距潮汐仪站位置半径50 km范围内的轨道来进行数据选择。然后，在观测时间段（2010年8月至2014年12月）中，通过测量距海岸（1、3、5、10、15和20 km）及附近的距离处的高度计，形成SLA的时间序列。四个等长线（10、25、50和75 m）。还介绍了AltiKa的SARAL高度计20 Hz数据的验证，并使用了该区域提供的两个35天重复地面轨迹。总体而言，在3至20 km的海岸带中选择的CryoSat-2 20 Hz SLA与西站（韦尔瓦）的数据非常吻合，均方根值在11.4至6.4 cm之间。东部站点（Bonanza）的分析得出有效值范围为16.8至14.6 cm。使用CryoSat-2 20 Hz SLA进行的比较与使用AltiKa 20 Hz SLA在距海岸5公里以上的距离处估计的均方根一致，在1-5个海岸带中要好得多。在两个台站观测到的SAR模式数据量的差异以及与潮汐仪的一致性可以通过以下方面来解释：（1）Bonanza站附近的海岸形态更复杂，测高轨迹几乎与海岸平行。 （2）由于瓜达尔基维尔河河口的存在，博南扎站附近的水动力较大； （3）Bonanza标尺记录中的剩余潮汐信号（未校正）。我们得出的结论是，SAR测高仪的质量与常规测高仪相当或什至略胜一筹，从而使SAR数据可用于海洋学研究和海平面监测。一个例子是对由于严重的瓜达尔基维尔河排放事件造成的地表信号进行的分析。 （C）2017 COSPAR。由Elsevier Ltd.出版。保留所有权利。

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