the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
On modeling the Southern Ocean Phytoplankton Functional Types
Abstract. This study highlights recent advances and challenges of applying coupled physical-biogeochemical modeling for investigating the distribution of the key phytoplankton groups in the Southern Ocean, an area of strong interest for understanding biogeochemical cycling and ecosystem functioning under present climate change. Our simulations of the phenology of various Phytoplankton Functional Types (PFTs) are based on a version of the Darwin biogeochemical model coupled to the Massachusetts Institute of Technology (MIT) general circulation model (Darwin-MITgcm). The ecological module version was adapted for the Southern Ocean by: 1) improving coccolithophores abundance relative to the original model by introducing a high affinity for nutrients and an ability to escape grazing control for coccolithophores; 2) including two different (small vs. large) size classes of diatoms; and 3) accounting for two distinct life stages for Phaeocystis (single cell vs. colonial). This new model configuration describes best the competition and co-occurrence of the PFTs in the Southern Ocean. It improves significantly relative to an older version the agreement of the simulated abundance of the coccolithophores and diatoms with in situ scanning electron microscopy observations in the Subantarctic Zone as well as with in situ diatoms and haptophytes (including coccolithophores and Phaeocystis) chlorophyll a concentrations within the Patagonian Shelf and along the Western Antarctic Peninsula obtained by diagnostic pigment analysis. The modeled Southern Ocean PFT dominance also agrees well with satellite-based PFT information.
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RC1: 'Review on “On modeling the Southern Ocean Phytoplankton Functional Types” by Losa et al. submitted to Biogeosciences discussion', Anonymous Referee #1, 27 Aug 2019
- AC3: 'the authors responses to reviewer 1 (as a pdf supplement)', Svetlana Losa, 02 Jan 2020
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RC2: 'Please find my comments in the supplement', Anonymous Referee #2, 29 Aug 2019
- AC2: 'the authors responses to reviewer 2 (as a pdf supplement)', Svetlana Losa, 02 Jan 2020
- AC1: 'to draw attention to the supplementary video materials', Svetlana Losa, 29 Aug 2019
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RC3: 'Review Losa et al. 2019', Anonymous Referee #3, 06 Sep 2019
- AC4: 'the authors responses to reviewer 3 (as a pdf supplement)', Svetlana Losa, 02 Jan 2020
-
RC1: 'Review on “On modeling the Southern Ocean Phytoplankton Functional Types” by Losa et al. submitted to Biogeosciences discussion', Anonymous Referee #1, 27 Aug 2019
- AC3: 'the authors responses to reviewer 1 (as a pdf supplement)', Svetlana Losa, 02 Jan 2020
-
RC2: 'Please find my comments in the supplement', Anonymous Referee #2, 29 Aug 2019
- AC2: 'the authors responses to reviewer 2 (as a pdf supplement)', Svetlana Losa, 02 Jan 2020
- AC1: 'to draw attention to the supplementary video materials', Svetlana Losa, 29 Aug 2019
-
RC3: 'Review Losa et al. 2019', Anonymous Referee #3, 06 Sep 2019
- AC4: 'the authors responses to reviewer 3 (as a pdf supplement)', Svetlana Losa, 02 Jan 2020
Video supplement
Simulated distribution of diatom chlorophyll concentration in the Southern Ocean S. N. Losa, S. Dutkiewicz, M. Losch, J. Oelker, M. A. Soppa, S. Trimborn, H. Xi, and A. Bracher https://doi.org/10.5446/42871
Simulated distribution of haptophytes chlorophyll concentration in the Southern Ocean S. N. Losa, S. Dutkiewicz, M. Losch, J. Oelker, M. A. Soppa, S. Trimborn, H. Xi, and A. Bracher https://doi.org/10.5446/42873
Simulated distribution of prokaryotes chlorophyll concentration in the Southern Ocean S. N. Losa, S. Dutkiewicz, M. Losch, J. Oelker, M. A. Soppa, S. Trimborn, H. Xi, and A. Bracher https://doi.org/10.5446/42872
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Cited
3 citations as recorded by crossref.
- Applications of biogeochemical models in different marine environments: a review K. Ismail & M. Al-Shehhi 10.3389/fenvs.2023.1198856
- Global Chlorophyll a Concentrations of Phytoplankton Functional Types With Detailed Uncertainty Assessment Using Multisensor Ocean Color and Sea Surface Temperature Satellite Products H. Xi et al. 10.1029/2020JC017127
- Factors controlling the competition between <i>Phaeocystis</i> and diatoms in the Southern Ocean and implications for carbon export fluxes C. Nissen & M. Vogt 10.5194/bg-18-251-2021