19 Apr 2021

19 Apr 2021

Review status: this preprint is currently under review for the journal ESSD.

Arctic sea surface height maps from multi-altimeter combination

Pierre Prandi1, Jean-Christophe Poisson2,a, Yannice Faugère1, Amandine Guillot3, and Gérald Dibarboure3 Pierre Prandi et al.
  • 1CLS, Ramonville, France
  • 2VorteX-Io, Toulouse France
  • 3CNES, Toulouse France
  • apreviously at: CLS

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 products. The final gridded fields cover all latitudes north of 50° N, on a 25 km EASE2 grid, with one grid every three days over three years from July 2016 to April 2019. 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 an ice covered areas. SARAL/AltiKa also provides the baseline for the cross-calibation of CryoSat-2 and Sentinel-3A data. When compared to independent data, the combined product exhibits a much better performance than previously available datasets based on the analysis of a single mission.

Pierre Prandi et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2021-123', Anonymous Referee #1, 12 May 2021
  • RC2: 'Comment on essd-2021-123', Anonymous Referee #2, 06 Jul 2021

Pierre Prandi et al.

Data sets

Gridded Sea Level Heights - Arctic Ocean Prandi, P.

Pierre Prandi et al.


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Short summary
We investigate how mapping sea level in the Arctic Ocean can benefit from combining data from three satellite radar altimeters: CryoSat-2, Sentinel-3A and SARAL/AltiKa. A dedicated processing on SARAL/AltiKa provides a baseline for the cross-referencing of CryoSat-2 and Sentinel-3A before mapping. We show that combining measurements coming from three missions, we are able to increase the resolution of gridded sea level fields in the ice-covered Arctic Ocean.