Preprints
https://doi.org/10.5194/os-2021-38
https://doi.org/10.5194/os-2021-38

  25 May 2021

25 May 2021

Review status: this preprint was under review for the journal OS. A revision for further review has not been submitted.

Geophysical and biogeochemical observations using BGC Argo floats in the western North Pacific during late winter and early spring. Part 1: Restratification processes of the surface mixed layer

Ryuichiro Inoue1, Chiho Sukigara2, Stuart Bishop3, Eitarou Oka4, and Takeyoshi Nagai2 Ryuichiro Inoue et al.
  • 1Japan Agency for Marine-Earth Science and Technology, Yokosuka, Kanagawa 237-0061, Japan
  • 2Tokyo University of Marine Science and Technology, Minato, Tokyo, 108-8477, Japan
  • 3North Carolina State University, Raleigh, North Carolina, 27695, USA
  • 4University of Tokyo, Kashiwa, Chiba, 277-0882, Japan

Abstract. To understand oceanic restratification in the subtropical northwestern Pacific and its influence on biogeochemical (BGC) processes, we examined post-storm restratification events observed from February to April 2018 by BGC-Argo floats, the BGC data from which were stoichiometrically analyzed by Sukigara et al. (2021; this issue). We found that during these events, restratification of the mixed layer (ML) was driven by geostrophic adjustment or ML eddy formation related to surface cooling during February to March. At the end of March, high surface chlorophyll a concentrations were observed within submesoscale eddies and at the edge of a mesoscale cyclonic feature observed from satellite data. Our results indicate that primary production in the subtropical northwestern Pacific is enhanced by the combined effects of mesoscale upwelling, storm-driven formation of a deep ML, subsequent formation of ML eddies, weak cooling, and the length of intervals between storms.

Ryuichiro Inoue et al.

Status: closed (peer review stopped)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on os-2021-38', Anonymous Referee #1, 06 Aug 2021
  • RC2: 'Comment on os-2021-38', Anonymous Referee #2, 07 Aug 2021

Status: closed (peer review stopped)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on os-2021-38', Anonymous Referee #1, 06 Aug 2021
  • RC2: 'Comment on os-2021-38', Anonymous Referee #2, 07 Aug 2021

Ryuichiro Inoue et al.

Ryuichiro Inoue et al.

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Short summary
We investigated how surface mixed layer (vertically homogeneous layer at the sea surface due to winter cooling) develops stratification between late winter and early spring. We used autonomous observing platforms to take time series data under sever weather conditions and found that lateral transports of lighter water were more important than surface heating during the observation period. We also found that the lateral process was also promote biological activities near the sea surface.