Arctic sea surface height maps from multi-altimeter combination

[摘要] We present a new Arctic sea level anomaly dataset based on the combination of three altimeter missions using an optimal interpolationscheme. Measurements from SARAL/AltiKa, CryoSat-2 and Sentinel-3A are blended together, providing an unprecedented resolution for this type ofproduct. Such high-resolution products are necessary to tackle some contemporaneous science questions in the basin. We use the adaptive retrackerto process both open ocean and lead echoes on SARAL/AltiKa, thus removing the need to estimate a bias between open ocean and ice-covered areas. Theusual processing approach, involving an empirical retracking algorithm on specular echoes, is applied on CryoSat-2 and Sentinel-3A synthetic aperture radar (SAR) modeechoes. SARAL/AltiKa also provides the baseline for the cross-calibration of CryoSat-2 and Sentinel-3A data. The final gridded fields cover alllatitudes north of 50 ∘  N, on a 25  km EASE2 grid, with one grid every 3 d over 3 years from July 2016 to April 2019. Whencompared to tide gauge measurements available in the Arctic Ocean, the combined product exhibits a much better performance than mono-missiondatasets with a mean correlation of 0.78 and a mean root-mean-square deviation (RMSd) of 5  cm . The effective temporal resolution of the combined product is 3 timesbetter than a single mission analysis. This dataset can be downloaded from https://doi.org/10.24400/527896/a01-2020.001 ( Prandi ,  2020 ) .

[学科分类] 眼科学