Preprints
https://doi.org/10.5194/egusphere-2022-660
https://doi.org/10.5194/egusphere-2022-660
20 Jul 2022
 | 20 Jul 2022

Assimilation of sea surface salinities from SMOS in an Arctic coupled ocean and sea ice reanalysis

Jiping Xie, Roshin P. Raj, Laurent Bertino, Justino Martínez, Carolina Gabarró, and Rafael Catany

Abstract. In the Arctic, the sea surface salinity (SSS) plays a key role in processes related to water mixing and sea ice. However, the lack of salinity observations causes large uncertainties in Arctic Ocean forecasts and reanalysis. Recently the Soil Moisture and Ocean Salinity (SMOS) satellite mission was used by the Barcelona Expert Centre to propose an Arctic SSS product.

In this study, we evaluate the impact of assimilating this data in a coupled ocean-ice data assimilation system. Using the Ensemble Kalman filter from July to December 2016, two assimilation runs assimilated two successive versions of the SMOS SSS product, on top of a pre-existing reanalysis run. The runs were validated against independent in situ salinity profiles in the Arctic. The results show that the biases and the Root Mean Squared Differences (RMSD) of SSS are reduced by 10 % to 50 % depending on areas and put the latest product to its advantage. The time series of Freshwater Content (FWC) further show that its seasonal cycle can be adjusted by assimilation of the SSS products, which is encouraging for its use in a long-time reanalysis to monitor the Arctic water cycle.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.

Journal article(s) based on this preprint

09 Mar 2023
Assimilation of sea surface salinities from SMOS in an Arctic coupled ocean and sea ice reanalysis
Jiping Xie, Roshin P. Raj, Laurent Bertino, Justino Martínez, Carolina Gabarró, and Rafael Catany
Ocean Sci., 19, 269–287, https://doi.org/10.5194/os-19-269-2023,https://doi.org/10.5194/os-19-269-2023, 2023
Short summary
Jiping Xie, Roshin P. Raj, Laurent Bertino, Justino Martínez, Carolina Gabarró, and Rafael Catany

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-660', Anonymous Referee #1, 04 Aug 2022
    • CC1: 'Reply on RC1', Jiping Xie, 12 Sep 2022
      • CC2: 'Reply on CC1', Jiping Xie, 12 Sep 2022
      • AC4: 'Reply on CC1', Jiping Xie, 23 Nov 2022
    • CC5: 'Reply on RC1', Jiping Xie, 13 Sep 2022
  • RC2: 'Comment on egusphere-2022-660', Anonymous Referee #2, 01 Sep 2022
    • CC3: 'Reply on RC2', Jiping Xie, 13 Sep 2022
    • AC2: 'Reply on RC2', Jiping Xie, 23 Nov 2022
  • RC3: 'Comment on egusphere-2022-660', Anonymous Referee #3, 02 Sep 2022
    • CC4: 'Reply on RC3', Jiping Xie, 13 Sep 2022
    • AC3: 'Reply on RC3', Jiping Xie, 23 Nov 2022

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-660', Anonymous Referee #1, 04 Aug 2022
    • CC1: 'Reply on RC1', Jiping Xie, 12 Sep 2022
      • CC2: 'Reply on CC1', Jiping Xie, 12 Sep 2022
      • AC4: 'Reply on CC1', Jiping Xie, 23 Nov 2022
    • CC5: 'Reply on RC1', Jiping Xie, 13 Sep 2022
  • RC2: 'Comment on egusphere-2022-660', Anonymous Referee #2, 01 Sep 2022
    • CC3: 'Reply on RC2', Jiping Xie, 13 Sep 2022
    • AC2: 'Reply on RC2', Jiping Xie, 23 Nov 2022
  • RC3: 'Comment on egusphere-2022-660', Anonymous Referee #3, 02 Sep 2022
    • CC4: 'Reply on RC3', Jiping Xie, 13 Sep 2022
    • AC3: 'Reply on RC3', Jiping Xie, 23 Nov 2022

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Jiping Xie on behalf of the Authors (16 Dec 2022)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (16 Dec 2022) by Marco Bajo
RR by Anonymous Referee #3 (17 Jan 2023)
RR by Anonymous Referee #1 (20 Jan 2023)
ED: Publish subject to minor revisions (review by editor) (20 Jan 2023) by Marco Bajo
AR by Jiping Xie on behalf of the Authors (03 Feb 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (15 Feb 2023) by Marco Bajo
AR by Jiping Xie on behalf of the Authors (17 Feb 2023)  Manuscript 

Journal article(s) based on this preprint

09 Mar 2023
Assimilation of sea surface salinities from SMOS in an Arctic coupled ocean and sea ice reanalysis
Jiping Xie, Roshin P. Raj, Laurent Bertino, Justino Martínez, Carolina Gabarró, and Rafael Catany
Ocean Sci., 19, 269–287, https://doi.org/10.5194/os-19-269-2023,https://doi.org/10.5194/os-19-269-2023, 2023
Short summary
Jiping Xie, Roshin P. Raj, Laurent Bertino, Justino Martínez, Carolina Gabarró, and Rafael Catany
Jiping Xie, Roshin P. Raj, Laurent Bertino, Justino Martínez, Carolina Gabarró, and Rafael Catany

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Short summary
Sea ice melt together with other freshwater sources have effects on the Arctic environment. The sea surface salinity (SSS) plays a key role to represent the water mixing. Recently the satellite SSS from SMOS was developed in Arctic region. In this study, we firstly evaluate the impact of assimilating this satellite data in an Arctic reanalysis system. It shows the SSS errors are reduced by 10–50 % depending on areas, encouraging its use in a long-time reanalysis to monitor the Arctic water cycle.