15 Feb 2021

15 Feb 2021

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

Observational Study on the Variability of Mixed Layer Depth in the Bering Sea and the Chukchi Sea in the Summer of 2019

Xiaohui Jiao1, Jicai Zhang1, and Chunyan Li2 Xiaohui Jiao et al.
  • 1Institute of Physical Oceanography, Ocean College, Zhejiang University, Zhoushan 316021, China
  • 2Department of Oceanography and Coastal Sciences, College of the Coast and Environment, Louisiana State University, Baton Rouge 70803, U.S.A.

Abstract. Based on the high-resolution CTD data from 58 stations in the Bering Sea and the Chukchi Sea in the summer of 2019, the mixed layer depth (MLD) was obtained according to the density difference threshold method. It was verified that the MLD could be estimated more accurately by using a criterion of 0.125 kg/m3 in this region. The MLD in the Bering Sea basin was larger than that in the Bering Sea shelf, and both of them were smaller than that in the Bering Sea slope. The MLD increased northward both in the Chukchi Sea shelf and the Chukchi Sea slope. The farther northward, the greater the difference between the MLD calculated from temperature (MLDt) and the MLD calculated from density (MLDd) was, and the more important the role of salinity was in determining the MLD. The larger MLD (refer to MLDd specifically) in the Bering Sea slope might be due to the enhancement of mixing caused by the Bering Slope Current (BSC) and eddies. The horizontal advection of the Bering Sea Anadyr Water and the Alaska Coastal Water in the Bering Sea shelf led to the shallower MLD in the central transition zone. The northward increase of the MLD in the Chukchi Sea might be related to the low-salinity seawater resulting from the melting of sea ice in summer. The spatial variation of MLD was more closely related to the surface momentum flux than the sea surface buoyancy flux, and the wave had little effect.

Xiaohui Jiao 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-2021-7', Anonymous Referee #1, 27 Mar 2021
  • RC2: 'Comment on os-2021-7', Anonymous Referee #2, 30 May 2021

Xiaohui Jiao et al.

Data sets

Replication Data for Observational Study on the Variability of Mixed Layer Depth in the Bering Sea and the Chukchi Sea in the Summer of 2019 Version 1.0 Xiaohui, Jiao

Xiaohui Jiao et al.


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Short summary
In the oceanic surface layer, the temperature, salinity, and density are mixed well vertically. And the depth of this layer is called mixed layer depth. The mixed layer depth is important because it is related to climate change. We obtained the mixed layer depth by measuring the salinity and the temperature in the Chukchi Sea and the Bering Sea in the summer of 2019, and found that the factors that might influence the mixed layer depth include ocean current, wind, heat and water flux.