Quantifying Net Community Production and Calcification at Station ALOHA Near Hawai'i: Insights and Limitations From a Dual Tracer Carbon Budget Approach

Knor, L.A.C.M.; Sabine, C.L.; Sutton, A.J.; White, A.E.; Potemra, J.; Weller, R.A.

doi:10.1029/2022GB007672

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Quantifying Net Community Production and Calcification at Station ALOHA Near Hawai'i: Insights and Limitations From a Dual Tracer Carbon Budget Approach

2023
By Knor, L.A.C.M. ; Sabine, C.L. ; Sutton, A.J. ; ...
Source: Global Biogeochemical Cycles, 37, e2022GB007672
Series: PMEL Contribution no. 5449

[PDF-2.57 MB]

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Details:

Journal Title:

Global Biogeochemical Cycles
Personal Author:

Knor, L.A.C.M. ; Sabine, C.L. ; Sutton, A.J. ; White, A.E. ; Potemra, J. ; ... More +

Knor, L.A.C.M. ; Sabine, C.L. ; Sutton, A.J. ; White, A.E. ; Potemra, J. ; Weller, R.A. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory) ; CINAR (Cooperative Institute for the North Atlantic Region)

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory) ; CINAR (Cooperative Institute for the North Atlantic Region) Less -
Description:

A budget approach is used to disentangle drivers of the seasonal mixed layer carbon cycle at Station ALOHA (A Long-term Oligotrophic Habitat Assessment) in the North Pacific Subtropical Gyre (NPSG). The budget utilizes data from the WHOTS (Woods Hole—Hawaii Ocean Time-series Site) mooring, and the ship-based Hawai'i Ocean Time-series (HOT) in the NPSG, a region of significant oceanic carbon uptake. Parsing the carbon variations into process components allows an assessment of both the proportional contributions of mixed layer carbon drivers and the seasonal interplay of drawdown and supply from different processes. Annual net community production reported here is at the lower end of previously published data, while net community calcification estimates are 4- to 7-fold higher than available sediment trap data, the only other estimate of calcium carbonate export at this location. Although the observed seasonal cycle in dissolved inorganic carbon in the NPSG has a relatively small amplitude, larger fluxes offset each other over an average year. Major supply comes from physical transport, especially lateral eddy transport throughout the year and entrainment in the winter, offset by biological carbon uptake in the spring. Gas exchange plays a smaller role, supplying carbon to the surface ocean between Dec-May and outgassing in Jul-Oct. Evaporation-precipitation (E-P) is variable with precipitation prevailing in the first half and evaporation in the second half of the year. The observed total alkalinity signal is largely governed by E-P with a somewhat stronger net calcification signal in the wintertime.
Keywords:

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Calcification Carbon Carbon Cycle (Biogeochemistry) ALOHA (A Long-term Oligotrophic Habitat Assessment) Carbon Budget Dissolved Inorganic Carbon Hawai'i North Pacific Subtropical Gyre (NPSG) WHOTS (Woods Hole—Hawaii Ocean Time-series Site)
Source:

Global Biogeochemical Cycles, 37, e2022GB007672
Series:

PMEL Contribution no. 5449
DOI:

https://doi.org/10.1029/2022GB007672
Format:

PDF
Document Type:

Journal Article
Funding:

Grant no. NA14OAR4320158 ; Grant no. NA21NMF4320043

Grant no. NA14OAR4320158 ; Grant no. NA21NMF4320043 Less -
Place as Subject:

Hawaii
License:

https://creativecommons.org/licenses/by-nc-nd/4.0/
Rights Information:

CC BY-NC-ND
Compliance:

Submitted
Main Document Checksum:

[+]

urn:sha256:02c412031f4c696664fbe3a304b128158f0c8693e2f6d2ebabde495c73d07c30
Download URL:

https://repository.library.noaa.gov/view/noaa/56422/noaa_56422_DS1.pdf
File Type:

	Supplemental media	pdf
	Available dataset	htm

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