Arctic sea surface height maps from multi-altimeter combination
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Published:2021-11-30
Issue:12
Volume:13
Page:5469-5482
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ISSN:1866-3516
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Container-title:Earth System Science Data
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language:en
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Short-container-title:Earth Syst. Sci. Data
Author:
Prandi PierreORCID, Poisson Jean-Christophe, Faugère Yannice, Guillot Amandine, Dibarboure Gérald
Abstract
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 an unprecedented resolution for this type of
product. Such high-resolution products are necessary to tackle some contemporaneous science questions in the basin. We use the adaptive retracker
to 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. The
usual processing approach, involving an empirical retracking algorithm on specular echoes, is applied on CryoSat-2 and Sentinel-3A synthetic aperture radar (SAR) mode
echoes. SARAL/AltiKa also provides the baseline for the cross-calibration of CryoSat-2 and Sentinel-3A data. The final gridded fields cover all
latitudes 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. When
compared to tide gauge measurements available in the Arctic Ocean, the combined product exhibits a much better performance than mono-mission
datasets 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 times
better than a single mission analysis. This dataset can be downloaded from https://doi.org/10.24400/527896/a01-2020.001 (Prandi, 2020).
Publisher
Copernicus GmbH
Subject
General Earth and Planetary Sciences
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