Onink, Victor; van Sebille, Erik; Laufkötter, Charlotte (2022). Empirical Lagrangian parametrization for wind-driven mixing of buoyant particles at the ocean surface. Geoscientific model development (GMD), 15(5), pp. 1995-2012. Copernicus Publications 10.5194/gmd-15-1995-2022
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Turbulent mixing is a vital component of vertical particulate transport, but ocean global circulation models (OGCMs) generally have low-resolution representations of near-surface mixing. Furthermore, turbulence data are often not provided in OGCM model output. We present 1D parametrizations of wind-driven turbulent mixing in the ocean surface mixed layer that are designed to be easily included in 3D Lagrangian model experiments. Stochastic transport is computed by Markov-0 or Markov-1 models, and we discuss the advantages and disadvantages of two vertical profiles for the vertical diffusion coefficient Kz. All vertical diffusion profiles and stochastic transport models lead to stable concentration profiles for buoyant particles, which for particles with rise velocities of 0.03 and 0.003 m s−1 agree relatively well with concentration profiles from field measurements of microplastics when Langmuir-circulation-driven turbulence is accounted for. Markov-0 models provide good model performance for integration time steps of Δt≈30 s and can be readily applied when studying the behavior of buoyant particulates in the ocean. Markov-1 models do not consistently improve model performance relative to Markov-0 models and require an additional parameter that is poorly constrained.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Physics Institute > Climate and Environmental Physics 10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR) |
UniBE Contributor: |
Onink, Victor, Laufkötter, Charlotte |
Subjects: |
500 Science > 530 Physics 500 Science > 550 Earth sciences & geology |
ISSN: |
1991-959X |
Publisher: |
Copernicus Publications |
Funders: |
[UNSPECIFIED] SNF |
Language: |
English |
Submitter: |
Charlotte Laufkötter |
Date Deposited: |
21 Mar 2022 09:44 |
Last Modified: |
05 Dec 2022 16:15 |
Publisher DOI: |
10.5194/gmd-15-1995-2022 |
BORIS DOI: |
10.48350/167436 |
URI: |
https://boris.unibe.ch/id/eprint/167436 |