Assessment of SARAL/AltiKa Wave Height Measurements Relative to Buoy, Jason-2, and Cryosat-2 Data

被引:72
作者
Hito Sepulveda, Hector [1 ]
Queffeulou, Pierre [2 ]
Ardhuin, Fabrice [2 ,3 ]
机构
[1] Univ Concepcion, Dept Geophys, Concepcion, Chile
[2] IFREMER, Lab Oceanog Spatiale, F-29280 Plouzane, France
[3] IFREMER, UMR 6523, Lab Phys Oceans, CNRS,UBO,IRD, Brest, France
基金
欧盟第七框架计划;
关键词
Radar altimeter; significant wave height; satellite; SARAL; AltiKa; validation; ALTIMETER DATA; WIND-SPEED; CALIBRATION; VALIDATION;
D O I
10.1080/01490419.2014.1000470
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
SARAL/AltiKa GDR-T are analyzed to assess the quality of the significant wave height (SWH) measurements. SARAL along-track SWH plots reveal cases of erroneous data, more or less isolated, not detected by the quality flags. The anomalies are often correlated with strong attenuation of the Ka-band backscatter coefficient, sensitive to clouds and rain. A quality test based on the 1Hz standard deviation is proposed to detect such anomalies. From buoy comparison, it is shown that SARAL SWH is more accurate than Jason-2, particularly at low SWH, and globally does not require any correction. Results are better with open ocean than with coastal buoys. The scatter and the number of outliers are much larger for coastal buoys. SARAL is then compared with Jason-2 and Cryosat-2. The altimeter data are extracted from the global altimeter SWH Ifremer data base, including specific corrections to calibrate the various altimeters. The comparison confirms the high quality of SARAL SWH. The 1Hz standard deviation is much less than for Jason-2 and Cryosat-2, particularly at low SWH. Furthermore, results show that the corrections applied to Jason-2 and to Cryosat-2, in the data base, are efficient, improving the global agreement between the three altimeters.
引用
收藏
页码:449 / 465
页数:17
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