Comparison of gridded multi-mission and along-track mono-mission satellite altimetry wave heights with in situ near-shore buoy data
Comparison of gridded multi-mission and along-track mono-mission satellite altimetry wave heights with in situ near-shore buoy data
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DOI：
10.1016/j.oceaneng.2014.03.014
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发表时间：
2014-06-01
影响因子：
5
通讯作者：
Hithin, N. K.
中科院分区：
文献类型：
--
作者：
Shanas, P. R.;Kumar, V. Sanil;Hithin, N. K.
通过比较网格化的多任务和沿轨道单任务有效波高（SWH）数据与印度东西海岸外四个站的现场浮标测量值，研究了高度计数据在沿海地区的适用性。在所有卫星中，Jason-2的同位点数量更多，相关性更好。将AVISO获得的多任务产品（Jason-1、Jason-2、Envisat和ERS-2）的SWH数据与实测浮标数据进行比较，发现所有卫星都高估了SWH。对1号、2号和4号测站的高度计数据分别采用0.75、0.70和0.69的校正系数，结果与浮标数据非常吻合（相关系数类似于0.9-0.96）。月平均浮标和高度计SWH值显示令人信服的相关性范围为0.97至0.98三个站。最小的相关系数（0.6）被发现在站3，其中选定的网格点位于靠近海岸，并受到陆地污染和波衰减效应。对于SWH < 0.5 m的波浪，所有测站的相关系数都很低，这强调了SWH < 0.5 m的高度计观测是不可靠的。(C)2014爱思唯尔有限公司版权所有。
The applicability of altimeter data for the coastal region is examined by comparing the gridded multi-mission and along-track mono-mission significant wave height (SWH) data with the in situ buoy measurements at four stations off the east and west coasts of India. Among all of the satellites, a greater number of collocated points and better correlation were found for Jason-2. A comparison of the SWH data from multi-mission products (Jason-1, Jason-2, Envisat, and ERS-2) obtained from AVISO with the measured buoy data shows that all of the satellites overestimated the SWH. Applying a correction factor of 0.75, 0.70 and 0.69 to the altimeter data for stations 1, 2 and 4, respectively, resulted in close agreement with the buoy data (correlation coefficient similar to 0.9-0.96). Monthly averaged buoy and altimeter SWH values show convincing correlation ranging from 0.97 to 0.98 for three stations. The smallest correlation coefficient (0.6) was found at station 3, where the selected grid points are located close to the coast and are influenced by land contamination and wave decay effects. For waves with a SWH < 0.5 m, the correlation coefficient is sparingly low for all stations, which underlines the fact that the altimeter observations for SWH < 0.5 m are unreliable. (C) 2014 Elsevier Ltd. All rights reserved.