A seasonal transition in biological carbon pump efficiency in the northern Scotia Sea, Southern Ocean

Henson, Stephanie A.; Briggs, Nathan; Carvalho, Filipa; Manno, Clara; Mignot, Alexandre; Thomalla, Sandy J.

doi:10.1016/j.dsr2.2023.105274

Cited by 8 publications

(7 citation statements)

References 70 publications

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“…Notably, despite large interannual variability in NPP and export at 100 m, the export at 170 m was similar between two years, highlighting interannual differences in flux attenuation and export efficiency attributed to community composition, grazing and water column density structure (Giddy et al [73]). Both seasonal and intra-seasonal variability in POC flux magnitude and efficiency was similarly observed in a four-month deployment of multiple gliders by the GOCART project (Gauging Ocean organic Carbon Attenuation using Robotic Technologies) downstream of South Georgia [99]. Here export efficiencies were high prior to the bloom peak (implying minimal heterotrophic consumption) but transfer efficiency was low, while during the post peak phase export flux decreased with a concomitant increase in transfer efficiency to the upper mesopelagic but a decrease in the lower mesopelagic.…”

Section: (A) Estimating Carbon Export From Optical Sensors On Autonom...mentioning

confidence: 72%

“…[73]). Both seasonal and intra-seasonal variability in POC flux magnitude and efficiency was similarly observed in a four-month deployment of multiple gliders by the GOCART project (Gauging Ocean organic Carbon Attenuation using Robotic Technologies) downstream of South Georgia [99]. Here export efficiencies were high prior to the bloom peak (implying minimal heterotrophic consumption) but transfer efficiency was low, while during the post peak phase export flux decreased with a concomitant increase in transfer efficiency to the upper mesopelagic but a decrease in the lower mesopelagic.…”

Section: Linking Phytoplankton Dynamics To Carbon Exportmentioning

confidence: 97%

“…[68,96]), subducted POC flux associated with small-scale ocean features (e.g. [97]), large particle aggregate flux [98], transfer efficiency [99] and fragmentation rates [100]. Results from the application of these approaches are beginning to reveal substantial regional and temporal variability in the magnitude of flux and its attenuation.…”

Section: (A) Estimating Carbon Export From Optical Sensors On Autonom...mentioning

confidence: 99%

“…[13]). Indeed, assuming time-invariance by applying a cruise-period mean export and transfer efficiency to the cruise integrated NPP resulted in an underestimate of export and sequestration flux by 49% and 45%, respectively [99].…”

Section: (A) Estimating Carbon Export From Optical Sensors On Autonom...mentioning

confidence: 99%

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Southern Ocean phytoplankton dynamics and carbon export: insights from a seasonal cycle approach

Thomalla

Plessis

Fauchereau

et al. 2023

Phil. Trans. R. Soc. A.

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Quantifying the strength and efficiency of the Southern Ocean biological carbon pump (BCP) and its response to predicted changes in the Earth's climate is fundamental to our ability to predict long-term changes in the global carbon cycle and, by extension, the impact of continued anthropogenic perturbation of atmospheric CO 2 . There is little agreement, however, in climate model projections of the sensitivity of the Southern Ocean BCP to climate change, with a lack of consensus in even the direction of predicted change, highlighting a gap in our understanding of a major planetary carbon flux. In this review, we summarize relevant research that highlights the important role of fine-scale dynamics (both temporal and spatial) that link physical forcing mechanisms to biogeochemical responses that impact the characteristics of the seasonal cycle of phytoplankton and by extension the BCP. This approach highlights the potential for integrating autonomous and remote sensing observations of fine scale dynamics to derive regionally optimized biogeochemical parameterizations for Southern Ocean models. Ongoing development in both the observational and modelling fields will generate new insights into Southern Ocean ecosystem function for improved predictions of the sensitivity of the Southern Ocean BCP to climate change. This article is part of a discussion meeting issue 'Heat and carbon uptake in the Southern Ocean: the state of the art and future priorities'.

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Section: (A) Estimating Carbon Export From Optical Sensors On Autonom...mentioning

confidence: 72%

Section: Linking Phytoplankton Dynamics To Carbon Exportmentioning

confidence: 97%

Section: (A) Estimating Carbon Export From Optical Sensors On Autonom...mentioning

confidence: 99%

Section: (A) Estimating Carbon Export From Optical Sensors On Autonom...mentioning

confidence: 99%

See 2 more Smart Citations

Southern Ocean phytoplankton dynamics and carbon export: insights from a seasonal cycle approach

Thomalla

Plessis

Fauchereau

et al. 2023

Phil. Trans. R. Soc. A.

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“…Sinking organic carbon that is remineralized within the Circumpolar Deep Water layer accounts for about half of the carbon sink in the Weddell Sea (MacGilchrist et al., 2019; Naveira Garabato et al., 2017), suggesting that changes in the BCP here can have a disproportionate impact on the global carbon cycle. However, how changes in PP translate to POC export from subseasonal to interannual timescales in the Antarctic remains unclear and an area of active research (e.g., Arteaga et al., 2020; Belcher et al., 2019; Henson et al., 2023; Moreau et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

Sea‐Ice Impacts Inter‐Annual Variability of Phytoplankton Bloom Characteristics and Carbon Export in the Weddell Sea

Giddy,

Nicholson,

Queste

et al. 2023

Geophysical Research Letters

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The Antarctic Marginal Ice Zone (MIZ) accounts for 15% of the Southern Ocean's primary production (PP), but limited data has hindered understanding of its variability and connection to carbon export. Using a combination of gliders, biogeochemical Argo floats and satellite observations in the northeast Weddell Sea, we show that years with more sea‐ice formation over winter are followed by more intense phytoplankton blooms (∼15% greater daily PP) and export to 100 m (∼50% higher daily carbon export) the following summer. However, the carbon export beyond the deepest winter mixed layer did not vary in proportion to PP, suggesting different drivers of carbon export at depth compared to surface waters. Furthermore, across the entire MIZ, the response of blooms to sea‐ice volume was spatially variable, indicating the need to consider spatial heterogeneity in the response of the biological carbon pump to future sea‐ice changes.

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Export of Dissolved Organic Carbon (DOC) compared to the particulate and active fluxes near South Georgia, Southern Ocean

Lovecchio,

Clément,

Evans

et al. 2023

Deep Sea Research Part II: Topical Studies in Oceanography

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A seasonal transition in biological carbon pump efficiency in the northern Scotia Sea, Southern Ocean

Cited by 8 publications

References 70 publications

Southern Ocean phytoplankton dynamics and carbon export: insights from a seasonal cycle approach

Southern Ocean phytoplankton dynamics and carbon export: insights from a seasonal cycle approach

Sea‐Ice Impacts Inter‐Annual Variability of Phytoplankton Bloom Characteristics and Carbon Export in the Weddell Sea

Export of Dissolved Organic Carbon (DOC) compared to the particulate and active fluxes near South Georgia, Southern Ocean

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