Air‐Sea Gas Transfer: Determining Bubble Fluxes With In Situ N2 Observations

Emerson, Steven; Yang, Bo; White, Mariela; Cronin, Meghan

doi:10.1029/2018jc014786

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Air‐Sea Gas Transfer: Determining Bubble Fluxes With In Situ N2 Observations

2019
By Emerson, Steven ; Yang, Bo ; White, Mariela ; ...
Source: Journal of Geophysical Research: Oceans, 124(4), 2716-2727

[PDF-1.24 MB]

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Journal Title:

Journal of Geophysical Research: Oceans
Personal Author:

Emerson, Steven ; Yang, Bo ; White, Mariela ; Cronin, Meghan

Emerson, Steven ; Yang, Bo ; White, Mariela ; Cronin, Meghan Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory)

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory) Less -
Description:

Oxygen measurements by in situ sensors on remote platforms are used to determine net biological oxygen fluxes in the surface ocean. On an annual basis these fluxes are stoichiometrically related to the export of organic carbon from the upper ocean (the ocean's biological carbon pump). In situ measurements on remote platforms make it feasible to observe the annual biological oxygen flux globally, but the accuracy of these estimates during periods of high winds depends on model‐determined fluxes by bubble processes created by breaking waves. We verify the importance of bubble processes in the gas exchange model of Liang et al. (2013, https://doi.org/10.1002gbc.20080) using surface‐ocean N2 gas measurements determined from observations of dissolved gas pressure and oxygen concentrations every 3 hr on a mooring in the northeast subarctic Pacific at Ocean Station Papa. The changes in N2 concentration during 10 separate monthlong periods in the winters between 2007 and 2016 indicate that bubble processes in the gas exchange model are over predicted by about a factor of 3 at this location. (The bubble mass transfer coefficients must be multiplied by 0.37 ± 0.14 to match the observations.) These results can be used to adjust model‐determined bubble fluxes to yield more accurate measurements of net biological oxygen production until the next generation gas‐exchange models are developed.
Keywords:

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Earth And Planetary Sciences (miscellaneous) Geochemistry And Petrology Geophysics Oceanography Space And Planetary Science
Source:

Journal of Geophysical Research: Oceans, 124(4), 2716-2727
DOI:

https://doi.org/10.1029/2018jc014786
ISSN:

2169-9275;2169-9291;
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PDF
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American Geophysical Union (AGU)
Document Type:

Journal Article
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Main Document Checksum:

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urn:sha256:e7a93b8d20f41139bc7d0e94ee65ba135050386053fb6e7bf17965c4d5999eee
Download URL:

https://repository.library.noaa.gov/view/noaa/59658/noaa_59658_DS1.pdf
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