Estimates of vertical turbulent mixing used to determine a vertical gradient in net and gross oxygen production in the oligotrophic South Pacific Gyre
Abstract Mixed layer (ML) gross (GOP) and net (NOP) oxygen production rates based on in situ mass balances of triple oxygen isotopes (TOI) and O2/Ar are influenced by vertical transport from below, a term traditionally difficult to constrain. Here we present a new approach to estimate vertical eddy...
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| Format: | Article |
| Language: | English |
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Wiley
2016-07-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1002/2016GL069523 |
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| author | W. Z. Haskell II M. G. Prokopenko R. H. R. Stanley A. N. Knapp |
| author_facet | W. Z. Haskell II M. G. Prokopenko R. H. R. Stanley A. N. Knapp |
| author_sort | W. Z. Haskell II |
| collection | DOAJ |
| description | Abstract Mixed layer (ML) gross (GOP) and net (NOP) oxygen production rates based on in situ mass balances of triple oxygen isotopes (TOI) and O2/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 (Kz) 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 Kz, verified by an independent 7Be‐based estimate, in an O2/TOI budget at a site in the oligotrophic South Pacific Gyre. NOP equaled 0.31 ± 0.16 mmol m−2 d−1 in the ML (~55–65 m depth) and 1.2 ± 0.4 mmol m−2 d−1 (80%) beneath the ML, while GOP equaled 74 ± 27 mmol m−2 d−1 (86%) in the ML and 12 ± 4 mmol m−2 d−1 (14%) below, revealing a vertical gradient in production rates unquantifiable without the Kz estimate. |
| format | Article |
| id | doaj-art-937fa5049c5c48ad9e69a6e278c461e9 |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2016-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-937fa5049c5c48ad9e69a6e278c461e92025-08-20T03:49:41ZengWileyGeophysical Research Letters0094-82761944-80072016-07-0143147590759910.1002/2016GL069523Estimates of vertical turbulent mixing used to determine a vertical gradient in net and gross oxygen production in the oligotrophic South Pacific GyreW. Z. Haskell II0M. G. Prokopenko1R. H. R. Stanley2A. N. Knapp3Department of Earth Sciences University of Southern California Los Angeles California USADepartment of Earth Sciences University of Southern California Los Angeles California USADepartment of Chemistry Wellesley College Wellesley Massachusetts USAEarth, Ocean, and Atmospheric Science Department Florida State University Tallahassee Florida USAAbstract Mixed layer (ML) gross (GOP) and net (NOP) oxygen production rates based on in situ mass balances of triple oxygen isotopes (TOI) and O2/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 (Kz) 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 Kz, verified by an independent 7Be‐based estimate, in an O2/TOI budget at a site in the oligotrophic South Pacific Gyre. NOP equaled 0.31 ± 0.16 mmol m−2 d−1 in the ML (~55–65 m depth) and 1.2 ± 0.4 mmol m−2 d−1 (80%) beneath the ML, while GOP equaled 74 ± 27 mmol m−2 d−1 (86%) in the ML and 12 ± 4 mmol m−2 d−1 (14%) below, revealing a vertical gradient in production rates unquantifiable without the Kz estimate.https://doi.org/10.1002/2016GL069523net oxygen production (NOP)net community production (NCP)gross oxygen production (GOP)gross primary production (GPP)South Pacific Gyreeddy diffusivity |
| spellingShingle | W. Z. Haskell II M. G. Prokopenko R. H. R. Stanley A. N. Knapp 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 net oxygen production (NOP) net community production (NCP) gross oxygen production (GOP) gross primary production (GPP) South Pacific Gyre eddy diffusivity |
| title | Estimates of vertical turbulent mixing used to determine a vertical gradient in net and gross oxygen production in the oligotrophic South Pacific Gyre |
| title_full | Estimates of vertical turbulent mixing used to determine a vertical gradient in net and gross oxygen production in the oligotrophic South Pacific Gyre |
| title_fullStr | Estimates of vertical turbulent mixing used to determine a vertical gradient in net and gross oxygen production in the oligotrophic South Pacific Gyre |
| title_full_unstemmed | Estimates of vertical turbulent mixing used to determine a vertical gradient in net and gross oxygen production in the oligotrophic South Pacific Gyre |
| title_short | Estimates of vertical turbulent mixing used to determine a vertical gradient in net and gross oxygen production in the oligotrophic South Pacific Gyre |
| title_sort | estimates of vertical turbulent mixing used to determine a vertical gradient in net and gross oxygen production in the oligotrophic south pacific gyre |
| topic | net oxygen production (NOP) net community production (NCP) gross oxygen production (GOP) gross primary production (GPP) South Pacific Gyre eddy diffusivity |
| url | https://doi.org/10.1002/2016GL069523 |
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