2019
DOI: 10.5194/bg-2019-289
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On modeling the Southern Ocean Phytoplankton Functional Types

Abstract: <p><strong>Abstract.</strong> 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 biog… Show more

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Cited by 8 publications
(13 citation statements)
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References 66 publications
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“…Concurrently, while available models agree with the observations on the general importance of light and iron levels, differences in the dominant bottom-up factors controlling the distribution of Phaeocystis at high SO latitudes across models are possibly a result of differences in how this phytoplankton type is parametrized (Tagliabue and Arrigo, 2005;Pasquer et al, 2005;Wang and Moore, 2011;Le Quéré et al, 2016;Kaufman et al, 2017;Losa et al, 2019). In this context, whether the model explicitly represents both Phaeocystis life stages (Pasquer et al, 2005;Kaufman et al, 2017;Losa et al, 2019) or only the colonial stage (Wang and Moore, 2011;Le Quéré et al, 2016) is key as single cells are known to have lower iron requirements than Phaeocystis colonies (Veldhuis et al, 1991). Besides bottom-up factors, some observational studies suggest that top-down factors are important in controlling the relative importance of Phaeocystis and diatoms as well.…”
Section: Introductionsupporting
confidence: 58%
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“…Concurrently, while available models agree with the observations on the general importance of light and iron levels, differences in the dominant bottom-up factors controlling the distribution of Phaeocystis at high SO latitudes across models are possibly a result of differences in how this phytoplankton type is parametrized (Tagliabue and Arrigo, 2005;Pasquer et al, 2005;Wang and Moore, 2011;Le Quéré et al, 2016;Kaufman et al, 2017;Losa et al, 2019). In this context, whether the model explicitly represents both Phaeocystis life stages (Pasquer et al, 2005;Kaufman et al, 2017;Losa et al, 2019) or only the colonial stage (Wang and Moore, 2011;Le Quéré et al, 2016) is key as single cells are known to have lower iron requirements than Phaeocystis colonies (Veldhuis et al, 1991). Besides bottom-up factors, some observational studies suggest that top-down factors are important in controlling the relative importance of Phaeocystis and diatoms as well.…”
Section: Introductionsupporting
confidence: 58%
“…The observed spatiotemporal differences in the relative importance of Phaeocystis and diatoms in the SO are thought to be largely controlled by differences in light and iron levels, but the relative importance of the different bottom-up factors appears to vary depending on the time and location of the sampling (Arrigo et al, 1998(Arrigo et al, , 1999Goffart et al, 2000;Sedwick et al, 2000;Garcia et al, 2009;Tang et al, 2009;Mills et al, 2010;Feng et al, 2010;Smith et al, 2011Smith et al, , 2014. Concurrently, while available models agree with the observations on the general importance of light and iron levels, differences in the dominant bottom-up factors controlling the distribution of Phaeocystis at high SO latitudes across models are possibly a result of differences in how this phytoplankton type is parametrized (Tagliabue and Arrigo, 2005;Pasquer et al, 2005;Wang and Moore, 2011;Le Quéré et al, 2016;Kaufman et al, 2017;Losa et al, 2019). In this context, whether the model explicitly represents both Phaeocystis life stages (Pasquer et al, 2005;Kaufman et al, 2017;Losa et al, 2019) or only the colonial stage (Wang and Moore, 2011;Le Quéré et al, 2016) is key as single cells are known to have lower iron requirements than Phaeocystis colonies (Veldhuis et al, 1991).…”
Section: Introductionmentioning
confidence: 60%
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“…The Darwin model was initialized on 1 January 2000 by a state obtained from the model setup described in Losa et al (2019). The period from 2000 to 2006 is assumed to be sufficiently long to get the upper ocean biogeochemistry in a quasi‐steady state (Clayton et al, 2017).…”
Section: Methodsmentioning
confidence: 99%
“…Overall this manuscript is premature and the authors must clarify their focus before publication. To sharpen the focus maybe it helps to look at the unpublished, recent modelling work on Southern Ocean Phaeocystis and PFTs (Losa et al 2019) that has been put up for discussion in Biogeosciences Discussion.…”
mentioning
confidence: 99%