Potential Role of Major Phytoplankton Communities on pCO2 Modulation in the Indian Sector of Southern Ocean

Sarkar, Amit; Mishra, Ravi; Bhaskar, P.V.; Anilkumar, N.; Sabu, P.; Soares, Melena A.

doi:10.1007/s41208-021-00323-2

Cited by 3 publications

(3 citation statements)

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“…The shift in community structure was attributed to a decrease in nutrient availability at the surface, whereby prokaryotes are better adapted to lower nutrient concentrations. Sarkar et al (2021) highlighted that haptophytes are crucial for the biological CO 2 drawdown in the Agulhas retroflection, reinforcing a weaker biological pump as the eddies evolve. In contrast, the cyclonic eddies displayed a linear increase in the cumulative CO 2 sink (Figure 1e).…”

Section: Discussionmentioning

confidence: 99%

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Mesoscale Eddies Enhance the Air‐Sea CO₂ Sink in the South Atlantic Ocean

Ford

Tilstone

Shutler

et al. 2023

Geophysical Research Letters

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Mesoscale eddies are abundant in the global oceans and known to affect oceanic and atmospheric conditions. Understanding their cumulative impact on the air‐sea carbon dioxide (CO2) flux may have significant implications for the ocean carbon sink. Observations and Lagrangian tracking were used to estimate the air‐sea CO2 flux of 67 long lived (>1 year) mesoscale eddies in the South Atlantic Ocean over a 16 year period. Both anticyclonic eddies originating from the Agulhas retroflection and cyclonic eddies originating from the Benguela upwelling act as net CO2 sinks over their lifetimes. Anticyclonic eddies displayed an exponential decrease in the net CO2 sink, whereas cyclonic eddies showed a linear increase. Combined, these eddies significantly enhanced the CO2 sink into the South Atlantic Ocean by 0.08 ± 0.04%. The studied eddies constitute a fraction of global eddies, and eddy activity is increasing; therefore, explicitly resolving eddies appears critical when assessing the ocean carbon sink.

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Section: Discussionmentioning

confidence: 99%

“…Sarkar et al. (2021) highlighted that haptophytes are crucial for the biological CO 2 drawdown in the Agulhas retroflection, reinforcing a weaker biological pump as the eddies evolve. In contrast, the cyclonic eddies displayed a linear increase in the cumulative CO 2 sink (Figure 1e).…”

Section: Discussionmentioning

confidence: 99%

Mesoscale Eddies Enhance the Air‐Sea CO₂ Sink in the South Atlantic Ocean

Ford

Tilstone

Shutler

et al. 2023

Geophysical Research Letters

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“…Carvalho et al (2019) showed that the phytoplankton community structure changed as the eddies aged, where younger anticyclonic (Agulhas) eddies were dominated by haptophytes (small flagellates) followed by prokaryotes. Sarkar et al (2021) highlighted that haptophytes are crucial for the biological CO2 drawdown in the Agulhas retroflection, reinforcing a weaker biological pump as the eddies evolve. In contrast, the cyclonic eddies displayed a linear increase in the cumulative CO2 sink (Fig.…”

Section: Discussionmentioning

confidence: 99%

Mesoscale eddies enhance the air-sea CO2 sink in the South Atlantic Ocean

Ford

Tilstone

Shutler

et al. 2022

Preprint

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Mesoscale eddies are abundant in the global oceans and known to affect marine biogeochemistry. Understanding their cumulative impact on the air-sea carbon dioxide (CO2) flux is likely important for quantifying the ocean carbon sink. Here, observations and Lagrangian tracking are used to estimate the air-sea CO2 flux of 67 long lived (i.e. > 1 year) mesoscale eddies in the South Atlantic Ocean over a 16 year period. We find that anticyclonic eddies originating from the Agulhas retroflection and cyclonic eddies originating from the Benguela upwelling act as net CO2 sinks over their lifetimes. In combination, the eddies significantly enhanced the CO2 sink into the South Atlantic Ocean by 0.08 ± 0.01%. Although this modification appears small, long lived eddies account for just ~0.4% of global ocean eddies and eddy activity is increasing; therefore, explicitly resolving eddy processes within all models used to assess the ocean carbon sink would appear critical.

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