EEZ KLIPS publicē zinātnisku publikāciju "Validation of the multi-mission altimeter data for the Baltic Sea region".



EEZ KLIPS ietvaros publicē zinātnisku publikāciju "Validation of the multi-mission altimeter data for the Baltic Sea region" (aut.N. A. Kudryavtseva, T. Soomere, ) žurnālā Proceedings of the Estonian Academy of Sciences


Publikācijas kopsavilkums

We present a complete cross-validation of Significant Wave Heights (SWH) extracted from altimetry data from all ten existing satellites with available in situ (buoy and echosounder) wave measurements for the Baltic Sea basin. The main purpose is to select an adequate altimetry data subset for a subsequent evaluation of the wave climate. The satellite measurements with the backscatter coefficients > 13.5, errors in the SWH normalized standard deviation > 0.5 m and snapshots with centroids closer than 0.2° to the land are not reliable. The ice flag usually denotes the ice concentration of > 50%. The presence of ice affects the SWH data starting from concentrations 10%, but sub stantial effects are only evident for concentrations > 30%. The altimetry data selected based on these criteria have very good correspondence with in situ data, except for GEOSAT Phase 1 data (1985–1989) that could not be validated. The root-mean-square difference and bias of altimetry and in situ data are in the range of 0.23–0.37 and ± 0.23 m, respectively. The bias for CRYOSAT-2, ERS-2, JASON-1/2 and SARAL is below 0.06 m. The SWH time series from several satellite pairs (ENVISAT/JASON-1, SARAL/JASON-2, ERS-1/TOPEX) exhibit substantial mutual temporal drift and part of them evidently are not homogeneous in time. A new high-resolution SWH data set from the SARAL satellite reveals a very good correspondence with the in-situ data and with the data stream from previous satellites.


Keywords—Altimeter, Validation, Significant Wave Height, Baltic Sea, Wave climate, SARAL/Altika


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