Validation of SWH and SSHA from SARAL/AltiKa Using Jason-2 and In-Situ Observations
The focus of this study is the validation of significant wave height (SWH) and sea surface height anomaly (SSHA) obtained from the first Ka-band altimeter AltiKa onboard SARAL (Satellite for ARGOS and Altimeters). It is a collaborative mission of the Indian Space Research Organization
and Centre National d'Etudes Spatiales (CNES). This is done using in-situ observations from buoy and Jason-2 measurements. Validation using buoy observations are at particular locations while that using Jason-2 altimeter is an attempt towards global validation of Altika products. The results
clearly indicate that the SARAL/AltiKa provide high-quality data and the errors are within a predefined range of accuracy. A parallel validation of SWH from other altimeters, which monitored ocean since last decade, like EnviSAT and Jason-2 was also performed with buoy observations. The results
clearly show that the accuracy of AltiKa SWH is much better than EnviSAT and comparable to reference mission Jason-2. The accuracy is quite good for the calm sea while in the rough seas the accuracy degrades some. The inter-comparison of SARAL/AltiKa SSHA with Jason-2 indicates a fair match
between them. These validation exercises demonstrate the high quality of AltiKa products, usable for practical applications.
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Document Type: Research Article
Space Application Centre, Ahmedabad, India
India Space Research Organization, Ahmedabad, India
National Institute of Ocean Technology (NIOT), Chennai, India
Observatoire de la Cote d'Azur, Valbonne, France
Centre National d'Etudes Spatiales (CNES), Toulouse, France
Publication date: September 10, 2015
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