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Estimates of vertical turbulent mixing used to determine a vertical gradient in net and gross oxygen production in the oligotrophic South Pacific Gyre

Title: Estimates of vertical turbulent mixing used to determine a vertical gradient in net and gross oxygen production in the oligotrophic South Pacific Gyre.
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Name(s): Haskell, W. Z., author
Prokopenko, M. G., author
Stanley, R. H. R., author
Knapp, A. N., author
Type of Resource: text
Genre: Text
Date Issued: 2016-07-28
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: Mixed layer (ML) gross (GOP) and net (NOP) oxygen production rates based on in situ mass balances of triple oxygen isotopes (TOI) and O-2/Ar are influenced by vertical transport from below, a term traditionally difficult to constrain. Here we present a new approach to estimate vertical eddy diffusivity (K-z) based on density gradients in the upper thermocline and wind speed-based rates of turbulent shear at the ML depth. As an example, we use this K-z, verified by an independent Be-7-based estimate, in an O-2/TOI budget at a site in the oligotrophic South Pacific Gyre. NOP equaled 0.310.16mmolm(-2)d(-1) in the ML (similar to 55-65m depth) and 1.20.4mmolm(-2)d(-1) (80%) beneath the ML, while GOP equaled 7427mmolm(-2)d(-1) (86%) in the ML and 124mmolm(-2)d(-1) (14%) below, revealing a vertical gradient in production rates unquantifiable without the K-z estimate.
Identifier: FSU_libsubv1_wos_000383290200037 (IID), 10.1002/2016GL069523 (DOI)
Keywords: dissolved-oxygen, eddy diffusivity, export production, flux, gross oxygen production (GOP), gross primary production (GPP), kinetic-energy, net community production (NCP), net oxygen production (NOP), Nitrogen, open-ocean, particulate organic-matter, sargasso sea, South Pacific Gyre, surface waters, triple-isotope composition
Publication Note: The publisher’s version of record is available at http://www.dx.doi.org/10.1002/2016GL069523
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000383290200037
Owner Institution: FSU
Is Part Of: Geophysical Research Letters.
0094-8276
Issue: iss. 14, vol. 43

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Haskell, W. Z., Prokopenko, M. G., Stanley, R. H. R., & Knapp, A. N. (2016). Estimates of vertical turbulent mixing used to determine a vertical gradient in net and gross oxygen production in the oligotrophic South Pacific Gyre. Geophysical Research Letters. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000383290200037