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biological pump in the Costa Rica Dome

Title: The biological pump in the Costa Rica Dome: An open ocean upwelling system with high new production and low export.
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Name(s): Stukel, Michael R, author
Benitez-Nelson, Claudia R, author
Decima, Moira, author
Taylor, Andrew G, author
Buchwald, Carolyn, author
Landry, Michael R, author
Type of Resource: text
Genre: Text
Journal Article
Date Issued: 2016-03-01
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: The Costa Rica Dome is a picophytoplankton-dominated, open-ocean upwelling system in the Eastern Tropical Pacific that overlies the ocean’s largest oxygen minimum zone. To investigate the efficiency of the biological pump in this unique area, we used shallow (90-150 m) drifting sediment traps and 234Th:238U deficiency measurements to determine export fluxes of carbon, nitrogen, and phosphorus in sinking particles. Simultaneous in situ measurements of nitrate uptake allowed us to assess the expected balance of new and export production. While f-ratios (new:total production) were reasonably high (0.36 ± 0.12, mean ± std. dev.), export efficiencies were considerably lower. Sediment traps suggested e-ratios (export/14C-primary production) at 90-100 m ranging from 0.053-0.067. ThE-ratios (234Th disequilibrium-derived export) ranged from 0.038-0.088. C:N and N:P stoichiometries of sinking material were both greater than canonical (Redfield) ratios or measured C:N of suspended particulates, and they increased with depth, suggesting that both nitrogen and phosphorus were preferentially remineralized from sinking particles. Our results are consistent with an ecosystem in which mesozooplankton play a major role in energy transfer to higher trophic levels but are relatively inefficient in mediating vertical carbon flux to depth, leading to an imbalance between new production and sinking flux.
Identifier: FSU_libsubv1_scholarship_submission_1509389454_4ff81645 (IID), 10.1093/plankt/fbv097 (DOI)
Keywords: Biogeochemistry, Eastern tropical pacific, Plankton, Carbon flux, Nutrients
Publication Note: Published version can be found at https://doi.org/10.1093/plankt/fbv097
Preferred Citation: Stukel, M. R., C. Benitez-Nelson, M. Décima, A. G. Taylor, C. Buchwald and M. R. Landry (2016). "The biological pump in the Costa Rica Dome: An open ocean upwelling system with high new production and low export." Journal of Plankton Research 38(2): 348-365. doi: 10.1093/plankt/fbv097
Grant Number: OCE-0826626
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_scholarship_submission_1509389454_4ff81645
Owner Institution: FSU
Is Part Of: Journal of Plankton Research.
Issue: iss. 2, vol. 38

Choose the citation style.
Stukel, M. R., Benitez-Nelson, C. R., Decima, M., Taylor, A. G., Buchwald, C., & Landry, M. R. (2016). The biological pump in the Costa Rica Dome: An open ocean upwelling system with high new production and low export. Journal Of Plankton Research. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_scholarship_submission_1509389454_4ff81645