07 Feb 2024
 | 07 Feb 2024
Status: this preprint is open for discussion.

Arctic Sea Surface Determination with Combined CryoSat-2 and ICESat-2 Data

Guodong Chen, Weiping Jiang, Zhijie Zhang, Taoyong Jin, and Dawei Li

Abstract. Due to the presence of sea ice, determining the sea surface height in the Arctic Ocean remains a significant challenge. State-of-the-art Arctic Mean Sea Surface (MSS) products are primarily derived from radar altimetry missions like CryoSat-2. However, the ICESat-2 laser altimeter can offer valuable sea surface observations up to 88° N latitude, extending the observational reach. This paper analyses the performance of combined CryoSat-2 and ICESat-2 data in determining the Arctic sea surface. Comparisons of overlapping observations from both missions reveal excellent consistency, with an inter-mission bias of less than 1 cm in the Arctic. Different geophysical corrections are considered, and the results suggest that only the ocean tide correction needs to be unified, while other corrections show minimal discrepancies. The MSS derived from combined data boasts both superior spatial coverage and precision compared to individual missions. The impact of summer melt pond is also discussed. The data from June, July and August are seriously contaminated, but only have limited effect on the mean sea surface calculation. Overall, the combined use of CryoSat-2 and ICESat-2 data offers a promising approach to accurately determining the Arctic sea surface, paving the way for improved understanding of sea level change and its implications in this critical region.

Guodong Chen, Weiping Jiang, Zhijie Zhang, Taoyong Jin, and Dawei Li

Status: open (until 03 Apr 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-3030', Ole Baltazar Andersen, 28 Feb 2024 reply
Guodong Chen, Weiping Jiang, Zhijie Zhang, Taoyong Jin, and Dawei Li
Guodong Chen, Weiping Jiang, Zhijie Zhang, Taoyong Jin, and Dawei Li


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Short summary
This paper attempts to determine Arctic mean sea surface and sea level change by combining ICESat-2 and CryoSat-2 data. Our results show that the SSH flag identified in ATL07 may be too strict, resulting in a small number of lead identifications. Combining the two missions can obtain sea surface height with higher accuracy and coverage in the Arctic. The results are helpful for the study of sea level, sea ice, and the accuracy of ICESat-2 and CryoSat-2 data in the Arctic.