Annual Mixed Layer Carbon Budget for the West Antarctic Peninsula Continental Shelf: Insights From Year-Round Mooring Measurements

Yang, Bo; Shadwick, Elizabeth H.; Schultz, Cristina; Doney, Scott C.

doi:10.1029/2020JC016920

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i

Annual Mixed Layer Carbon Budget for the West Antarctic Peninsula Continental Shelf: Insights From Year-Round Mooring Measurements

2021
By Yang, Bo ; Shadwick, Elizabeth H. ; Schultz, Cristina ; ...
Source: Journal of Geophysical Research: Oceans, 126(4)

[PDF-1.15 MB]

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Journal Title:

Journal of Geophysical Research: Oceans
Personal Author:

Yang, Bo ; Shadwick, Elizabeth H. ; Schultz, Cristina ; Doney, Scott C.

Yang, Bo ; Shadwick, Elizabeth H. ; Schultz, Cristina ; Doney, Scott C. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; AOML (Atlantic Oceanographic and Meteorological Laboratory) ; CIMAS (Cooperative Institute for Marine and Atmospheric Studies)

OAR (Oceanic and Atmospheric Research) ; AOML (Atlantic Oceanographic and Meteorological Laboratory) ; CIMAS (Cooperative Institute for Marine and Atmospheric Studies) Less -
Description:

For the first time the annual carbon budget on the West Antarctic Peninsula shelf was studied with continuously measured CO2 system parameters (pH and pCO2) from a subsurface mooring. The temporal evolution of the mixed layer dissolved inorganic carbon (DIC) is investigated via a mass balance. The annual mixed layer DIC inventory change was 1.1 ± 0.4 mol m−2 yr−1, which was mainly regulated by biological drawdown (−2.8 ± 2.4 mol m−2 yr−1), diapycnal eddy diffusion (2.6 ± 1.3 mol m−2 yr−1), entrainment/detrainment (0.9 ± 0.4 mol m−2 yr−1), and air-water gas exchange (0.4 ± 2.1 mol m−2 yr−1). Significant carbon drawdown was observed in the spring and summer, which was replenished by the physical processes mentioned above. These observations suggest this area is an annual atmosphere CO2 sink with a mixed layer net community production of 2.8 ± 2.4 mol m−2 yr−1. These results highlight the significant seasonality in the DIC mass balance and the necessity of year-round continuous observations for robust assessments of biogeochemical cycling in this region.
Keywords:

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Atmospheric carbon dioxide
Source:

Journal of Geophysical Research: Oceans, 126(4)
DOI:

https://doi.org/10.1029/2020JC016920
Document Type:

Journal Article
Place as Subject:

Antarctica
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CC BY-NC-ND
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Submitted
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urn:sha256:ebba864397b871436c50f3920fbe155ccf8ff470e6571d9f7e3287fc4f50b3b7
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https://repository.library.noaa.gov/view/noaa/29312/noaa_29312_DS1.pdf
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Annual Mixed Layer Carbon Budget for the West Antarctic Peninsula Continental Shelf: Insights From Year-Round Mooring Measurements

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