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Mesoscale ocean fronts enhance carbon export due to gravitational sinking and subduction.

Title: Mesoscale ocean fronts enhance carbon export due to gravitational sinking and subduction.
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Name(s): Stukel, Michael R, author
Aluwihare, Lihini I, author
Barbeau, Katherine A, author
Chekalyuk, Alexander M, author
Goericke, Ralf, author
Miller, Arthur J, author
Ohman, Mark D, author
Ruacho, Angel, author
Song, Hajoon, author
Stephens, Brandon M, author
Landry, Michael R, author
Type of Resource: text
Genre: Journal Article
Text
Date Issued: 2017-02-07
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: Enhanced vertical carbon transport (gravitational sinking and subduction) at mesoscale ocean fronts may explain the demonstrated imbalance of new production and sinking particle export in coastal upwelling ecosystems. Based on flux assessments from U:Th disequilibrium and sediment traps, we found 2 to 3 times higher rates of gravitational particle export near a deep-water front (305 mg C⋅m⋅d) compared with adjacent water or to mean (nonfrontal) regional conditions. Elevated particle flux at the front was mechanistically linked to Fe-stressed diatoms and high mesozooplankton fecal pellet production. Using a data assimilative regional ocean model fit to measured conditions, we estimate that an additional ∼225 mg C⋅m⋅d was exported as subduction of particle-rich water at the front, highlighting a transport mechanism that is not captured by sediment traps and is poorly quantified by most models and in situ measurements. Mesoscale fronts may be responsible for over a quarter of total organic carbon sequestration in the California Current and other coastal upwelling ecosystems.
Identifier: FSU_pmch_28115723 (IID), 10.1073/pnas.1609435114 (DOI), PMC5307443 (PMCID), 28115723 (RID), 28115723 (EID), 1609435114 (PII)
Keywords: Biological carbon pump, Carbon cycle, Particle flux, Particulate organic carbon, Plankton
Publication Note: This NIH-funded author manuscript originally appeared in PubMed Central at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5307443.
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_pmch_28115723
Host Institution: FSU
Is Part Of: Proceedings of the National Academy of Sciences of the United States of America.
1091-6490
Issue: iss. 6, vol. 114

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Stukel, M. R., Aluwihare, L. I., Barbeau, K. A., Chekalyuk, A. M., Goericke, R., Miller, A. J., … Landry, M. R. (2017). Mesoscale ocean fronts enhance carbon export due to gravitational sinking and subduction. Proceedings Of The National Academy Of Sciences Of The United States Of America. Retrieved from http://purl.flvc.org/fsu/fd/FSU_pmch_28115723