Preprints
https://doi.org/10.5194/npg-2021-1
https://doi.org/10.5194/npg-2021-1

  15 Jan 2021

15 Jan 2021

Review status: a revised version of this preprint was accepted for the journal NPG and is expected to appear here in due course.

Enhanced internal tidal mixing in the Philippine Sea mesoscale environment

Jia You1,3,4, Zhenhua Xu1,2,3,4, Qun Li5, Robin Robertson6, Peiwen Zhang1,3,4, and Baoshu Yin1,2,3,4 Jia You et al.
  • 1CAS Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
  • 2Pilot National Laboratory for Marine Science and Technology, Qingdao, China
  • 3Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, China
  • 4College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China
  • 5Polar Research Institute of China, Shanghai, China
  • 6China-Asean College of Marine Science, Xiamen University Malaysia, Sepang, Malaysia

Abstract. Turbulent mixing in the ocean interior is mainly contributed by internal wave breaking; however, the mixing properties and the modulation effects of mesoscale environmental factors are not well-known. Here, the spatially inhomogeneous and seasonally variable diapycnal diffusivities in the upper Philippine Sea were estimated from ARGO float data using a strain-based finescale parameterization. Based on a coordinated analysis of multi-source data, we found that the driving processes for diapycnal diffusivities mainly included the near-inertial waves and internal tides. Mesoscale features were important in intensifying the mixing and modulating its spatial pattern. One interesting finding was that, besides near-inertial waves, internal tides also contributed significant diapycnal mixing for the upper Philippine Sea. The seasonal cycles of diapycnal diffusivities and their contributors differed zonally. In the mid-latitudes, wind-mixing dominated and was strongest in winter and weakest in summer. In contrast, tidal-mixing was more predominant in the lower-latitudes and had no apparent seasonal variability. Furthermore, we provide evidence that the mesoscale environment in the Philippine Sea played a significant role in regulating the intensity and shaping the spatial inhomogeneity of the internal tidal mixing. The magnitudes of internal tidal mixing was greatly elevated in regions of energetic mesoscale processes. The anticyclonic mesoscale features were found to enhance diapycnal mixing more significantly than did cyclonic ones.

Jia You et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on npg-2021-1', Anonymous Referee #1, 03 Feb 2021
    • AC1: 'Reply on RC1', Zhenhua Xu, 24 Feb 2021
  • RC2: 'Comment on npg-2021-1', Anonymous Referee #2, 07 Feb 2021
    • AC2: 'Reply on RC2', Zhenhua Xu, 24 Feb 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on npg-2021-1', Anonymous Referee #1, 03 Feb 2021
    • AC1: 'Reply on RC1', Zhenhua Xu, 24 Feb 2021
  • RC2: 'Comment on npg-2021-1', Anonymous Referee #2, 07 Feb 2021
    • AC2: 'Reply on RC2', Zhenhua Xu, 24 Feb 2021

Jia You et al.

Jia You et al.

Viewed

Total article views: 654 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
572 68 14 654 4 5
  • HTML: 572
  • PDF: 68
  • XML: 14
  • Total: 654
  • BibTeX: 4
  • EndNote: 5
Views and downloads (calculated since 15 Jan 2021)
Cumulative views and downloads (calculated since 15 Jan 2021)

Viewed (geographical distribution)

Total article views: 576 (including HTML, PDF, and XML) Thereof 575 with geography defined and 1 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 12 May 2021
Special issue
Download
Short summary
Turbulent mixing in the ocean interior is mainly contributed by internal wave breaking. Here, the spatially inhomogeneous and seasonally variable diapycnal diffusivities in the upper Philippine Sea were estimated from ARGO float data. The driving processes mainly included the near-inertial waves and internal tides. The mesoscale environment in the Philippine Sea played a significant role in regulating the intensity and shaping the spatial inhomogeneity of the internal tidal mixing.