Arctic sea surface height maps from multi-altimeter combination

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