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首页> 外文期刊>Journal of neurosurgical sciences >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Cadiz海湾东部大陆架子的低温-2 Siral海平数据（西班牙）

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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：我们展示了欧洲航天局Cryosat-2卫星在SAR模式下的欧洲航天局Cryosat-2卫星的Siral高度验证了海上架子的海平面测量。将20 Hz张力速率（沿卫星轨道约为350米对应于卫星轨道的大约350米）的时间序列，与沿着研究区域的西班牙海岸的两倍测量站进行比较。由于低温重复循环 - 2（369天），通过将所有轨道沿着潮汐仪表站的位置落在50公里的半径上，执行数据选择。然后，通过在距离海岸（1,3,5,10,15和20 km）越来越远，观测时间（2014年8月至2014年12月）在观测时间段（2010年8月至2014年12月）中形成了SLA的时间序列。四个isobath（10,25,50和75米）。还介绍了Altika的Saral高度计20-Hz数据的验证，还提供了该地区可用的两个35天重复地面轨道。总体而言，在沿海地带中选择的低温-2 20-Hz SLA从3到20km的3至20km，与西班牙站（HUELVA）的数据相同，RMSE从11.4到6.4厘米。东站（Bonanza）的分析产生的RMSE从16.8到14.6厘米。用CryoSat-2 20-Hz SLA制作的比较与使用Altika 20-Hz SLA估计的RMSE达到高于5公里的海岸，在1-5沿海频段中更好。在两个站观察到的SAR模式数据数量和与潮汐仪的协议的差异可以通过（1）（1）与海岸轨道几乎平行于海岸的高度轨道更复杂的沿海形态学; （2）由于瓜达拉基尔河河口河口的存在，博纳扎站周围的流体动力学; （3）Bonanza仪表记录中的残余（未校正）潮汐信号。我们得出结论，SAR高度测定法的质量比传统的Altimetry具有可比性甚至略微好转，因此符合海洋研究和海平面监测中的SAR数据进行利用。一个例子是由于重型瓜达拉基韦河排放事件而对表面信号进行的分析。 （c）2017 Cospar。 elsevier有限公司出版。保留所有权利。

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