Regional characteristics of the temporal variability in the global particulate inorganic carbon inventory
Regional characteristics of the temporal variability in the global particulate inorganic carbon inventory
Coccolithophores are a biogeochemically important calcifying group of phytoplankton that exert significant influence on the global carbon cycle. They can modulate the air‐sea flux of CO2 through the processes of photosynthesis and calcification and, as one of the primary contributors to the oceanic particulate inorganic carbon (PIC) pool, promote the export of organic carbon to depth. Here we present the first interannually resolved, global analysis of PIC standing stock. Average, global PIC standing stock in the top 100 m is estimated to be 27.04 ± 4.33 Tg PIC, with turnover times of ~7 days, which suggests PIC is likely removed by active processes such as grazing or rapid sinking, mediated through biogenic packaging (i.e., fecal pellets). We find that the Southern Hemisphere plays a significant role in the variability in PIC inventories and that interannual variability in PIC standing stock is driven primarily by variability in the midlatitude oceanic gyres and regions within the Great Calcite Belt of the Southern Ocean. Our results provide a framework against which future changes in global PIC standing stocks may be assessed.
Hopkins, Jason
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Henson, Stephanie A.
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Poulton, Alex J.
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Balch, William M.
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Hopkins, Jason
70500a83-6db3-48c0-96e4-2c9b61e29103
Henson, Stephanie A.
d6532e17-a65b-4d7b-9ee3-755ecb565c19
Poulton, Alex J.
14bf64a7-d617-4913-b882-e8495543e717
Balch, William M.
18270567-fc45-4bc9-bd82-253d473e9564
Hopkins, Jason, Henson, Stephanie A., Poulton, Alex J. and Balch, William M.
(2019)
Regional characteristics of the temporal variability in the global particulate inorganic carbon inventory.
Global Biogeochemical Cycles.
(doi:10.1029/2019GB006300).
Abstract
Coccolithophores are a biogeochemically important calcifying group of phytoplankton that exert significant influence on the global carbon cycle. They can modulate the air‐sea flux of CO2 through the processes of photosynthesis and calcification and, as one of the primary contributors to the oceanic particulate inorganic carbon (PIC) pool, promote the export of organic carbon to depth. Here we present the first interannually resolved, global analysis of PIC standing stock. Average, global PIC standing stock in the top 100 m is estimated to be 27.04 ± 4.33 Tg PIC, with turnover times of ~7 days, which suggests PIC is likely removed by active processes such as grazing or rapid sinking, mediated through biogenic packaging (i.e., fecal pellets). We find that the Southern Hemisphere plays a significant role in the variability in PIC inventories and that interannual variability in PIC standing stock is driven primarily by variability in the midlatitude oceanic gyres and regions within the Great Calcite Belt of the Southern Ocean. Our results provide a framework against which future changes in global PIC standing stocks may be assessed.
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Hopkins_et_al-2019-Global_Biogeochemical_Cycles
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Accepted/In Press date: 30 September 2019
e-pub ahead of print date: 22 October 2019
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Local EPrints ID: 436335
URI: http://eprints.soton.ac.uk/id/eprint/436335
ISSN: 0886-6236
PURE UUID: 64276688-f08a-42bf-bac3-d6cca8d0b6a0
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Date deposited: 06 Dec 2019 17:30
Last modified: 17 Mar 2024 05:05
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Author:
Jason Hopkins
Author:
Alex J. Poulton
Author:
William M. Balch
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