Preprints
https://doi.org/10.5194/os-2021-79
https://doi.org/10.5194/os-2021-79

  25 Aug 2021

25 Aug 2021

Review status: a revised version of this preprint is currently under review for the journal OS.

Arctic sea level variability from high-resolution model simulations and implications for the Arctic observing system

Guokun Lyu1,2, Nuno Serra2, Meng Zhou1, and Detlef Stammer2 Guokun Lyu et al.
  • 1School of Oceanography, Shanghai Jiao Tong University, Shanghai, 200030, China
  • 2Center for Earth System Research and Sustainability (CEN), University of Hamburg, Hamburg, 20146, Germany

Abstract. Two high-resolution model simulations are used to investigate the spatio-temporal variability of the Arctic Ocean sea level. The model simulations reveal barotropic sea level variability at periods < 30 days, which is strongly captured by bottom pressure observations. The seasonal sea level variability is driven by volume ex-changes with the Pacific and Atlantic Oceans and the redistribution of the water by the wind. Halosteric effects due to river runoff and evaporation minus precipitation (EmPmR), ice melting/formation also contribute in the marginal seas and seasonal sea ice extent regions. In the central Arctic Ocean, especially the Canadian Basin, the decadal halosteric effect dominates sea level variability. Satellite altimetric observations and Gravity Re-covery and Climate Experiment (GRACE) measurements could be used to infer freshwater content changes in the Canadian Basin at periods longer than one year. The increasing number of profiles seems to capture fresh-water content changes since 2007, encouraging further data synthesis work with a more complicated interpola-tion method. Further, in-situ hydrographic observations should be enhanced to reveal the freshwater budget and close the gaps between satellite altimetry and GRACE, especially in the marginal seas.

Guokun Lyu 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 os-2021-79', Benjamin Rabe, 12 Oct 2021
    • AC1: 'Reply on RC1', Guokun Lyu, 25 Nov 2021
  • RC2: 'Comment on os-2021-79', Anonymous Referee #2, 29 Oct 2021
    • AC2: 'Reply on RC2', Guokun Lyu, 25 Nov 2021

Guokun Lyu et al.

Guokun Lyu et al.

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Short summary
This study explores the Arctic sea level variability depending on different timescales and the relation to temperature, salinity, and mass changes, identifying key parameters and regions that need to be observed coordinately. The decadal sea level variability reflects salinity changes. But it can only reflect salinity change at periods > 1 year, highlighting the requirement for enhancing in-situ hydrographic observations and complicated interpolation methods.