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Preprints
https://doi.org/10.5194/essd-2019-166
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-2019-166
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

  30 Oct 2019

30 Oct 2019

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A revised version of this preprint was accepted for the journal ESSD and is expected to appear here in due course.

Reanalysis of vertical mixing in mesocosm experiments: PeECE III and KOSMOS 2013

Sabine Mathesius1, Julia Getzlaff1, Heiner Dietze1,2, Andreas Oschlies1,2, and Markus Schartau1 Sabine Mathesius et al.
  • 1GEOMAR Helmholtz Centre for Ocean Research Kiel
  • 2Kiel University (CAU)

Abstract. Controlled manipulation of environmental conditions within large enclosures in the ocean, so-called pelagic mesocosms, has become a standard method to explore potential responses of marine plankton communities to anthropogenic change. Among the challenges of interpreting mesocosm data is the often uncertain role of vertical mixing, which usually is not observed directly. To account for mixing nonetheless, two pragmatic assumptions are common: either that the water column is homogeneously mixed or that it is divided into two water bodies with a horizontal barrier inhibiting turbulent exchange. In this study, we present a model-based reanalysis of vertical turbulent diffusion in the mesocosm experiments PeECE III and KOSMOS 2013. Our diffusivity estimates indicate intermittent mixing events along with stagnating periods and yield simulated temperature and salinity profiles that are consistent with the observations. Here, we provide the respective diffusivities as a comprehensive data product in the Network Common Data Format (NetCDF). This data product will help to guide forthcoming model studies that aim at deepening our understanding of biogeochemical processes in the PeECE III and KOSMOS 2013 mesocosms, such as the CO2-related changes in marine carbon export. In addition, we make our model code available, providing an adjustable tool to simulate vertical mixing in any other pelagic mesocosm. The data product and the model code are available at https://doi.org/10.1594/PANGAEA.905311 (Mathesius et al., 2019).

Sabine Mathesius et al.

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Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Sabine Mathesius et al.

Data sets

Reanalysis of vertical mixing in mesocosm experiments: PeECE III and KOSMOS 2013 S. Mathesius, J. Getzlaff, H. Dietze, A. Oschlies, and M. Schartau https://doi.org/10.1594/PANGAEA.905311

Model code and software

Reanalysis of vertical mixing in mesocosm experiments: PeECE III and KOSMOS 2013 S. Mathesius, J. Getzlaff, H. Dietze, A. Oschlies, and M. Schartau https://doi.org/10.1594/PANGAEA.905311

Sabine Mathesius et al.

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Short summary
Controlled manipulation of environmental conditions within large enclosures in the ocean, so-called pelagic mesocosms, has become a standard method to explore responses of marine plankton communities to anthropogenic change. Among the challenges of interpreting mesocosm data is the often uncertain role of vertical mixing.This study introduces a mesocosm mixing model that is able to estimate vertical diffusivities and thus provides a tool for future mesocosm data analyses that account for mixing.
Controlled manipulation of environmental conditions within large enclosures in the ocean,...
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