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Frontolysis by surface heat flux in the eastern Japan Sea: importance of mixed layer depth

  • Shun OhishiEmail author
  • Hidenori Aiki
  • Tomoki Tozuka
  • Meghan F. Cronin
Original Article
  • 60 Downloads

Abstract

Frontolysis mechanisms by which surface heat flux relaxes the sea surface temperature (SST) front in the eastern Japan Sea (JS) are investigated in detail using observational datasets. On the warm southern side of the front, larger air–sea specific humidity and temperature differences induce stronger turbulent heat release compared to the cool northern side. As a result, stronger wintertime cooling and weaker summertime warming occur south of the front, and the meridional gradient in the surface net heat flux (NHF) tends to relax the SST front throughout the year. In the mixed-layer deepening phase (September–January), a higher entrainment velocity occurs on the warm southern side because of weaker stratification. Since the resulting thicker mixed layer on the southern side is less sensitive to surface cooling, the mixed layer depth (MLD) gradient damps the frontolysis by the NHF gradient. In the shoaling phase (April–June), a deeper mixed layer south of the front is caused by the weaker warming and reduced sensitivity of the thicker mixed layer to a shoaling effect by shortwave radiation. Owing to weaker sensitivity of the thicker mixed layer on the southern side to surface warming, the MLD gradient enhances the frontolysis by the NHF gradient. Therefore, it is shown that the mixed layer processes cause seasonality of weaker (stronger) frontolysis by surface heat fluxes, damping (enhancing) the frontolysis by the NHF gradient in winter (summer). This study reveals unique features of the frontolysis in the eastern JS compared with the Agulhas Return Current and Kuroshio Extension regions.

Keywords

Frontolysis Mixed layer processes Entrainment Japan Sea Sea surface temperature front 

Notes

Acknowledgements

We are very thankful to two anonymous reviewers for their constructive and useful comments. This study was supported by the Japan Society for Promotion of Science through a Grant-in-Aid for Scientific Research on Innovative Areas (grant number JP16H01589). PMEL contribution 4761.

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Copyright information

© The Oceanographic Society of Japan and Springer Nature Singapore Pte Ltd, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institute for Space-Earth Environmental ResearchNagoya UniversityNagoyaJapan
  2. 2.Department of Earth and Planetary Science, Graduate School of ScienceThe University of TokyoTokyoJapan
  3. 3.NOAA Pacific Marine Environmental LaboratorySeattleUSA
  4. 4.Application LaboratoryJapan Agency for Marine-Earth Science and TechnologyYokohamaJapan

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