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An assessment of upper ocean carbon and nitrogen export fluxes on the boreal continental shelf: A 3-year study in the open Baltic Sea comparing sediment traps, 234Th proxy, nutrient, and oxygen budgets
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
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2013 (English)In: Limnology and Oceanography: Methods, ISSN 1541-5856, E-ISSN 1541-5856, Vol. 11, 495-510 p.Article in journal (Refereed) Published
Abstract [en]

Six different approaches for estimating the upper ocean export of carbon and nitrogen has been assessed using 2-3 years of observations in the open Baltic Sea. The long-term average export ratios, relative to primary production, were similar from approaches based on upper ocean N budget (0.29 +/- 0.02), upper ocean O budget (0.25 +/- 0.02), collection-efficiency-corrected sediment traps (0.30 +/- 0.03), and Th-234-derived POC export (0.21 +/- 0.03; POC/Th-234 ratio from traps). Estimates of carbon export efficiency based on direct sediment traps (0.14 +/- 0.02) likely reflected under trapping whereas filter-based Th-234-derived POC export (0.86 +/- 0.03) indicated that POC/Th-234 ratio from filters were larger than the ratio on truly settling matter; these two approaches and estimates are thus not recommended. This study provides improved constraints on the upper ocean C and N export in offshore temperate-boreal continental shelf regimes such as the open Baltic Proper. The long-term export fluxes derived by averaging the four geochemically consistent yet independent approaches were for POC 44.6 +/- 4.0 gC m(-2) y(-1) and for PON 7.0 +/- 0.6 gN m(-2) y(-1). This multi-technique approach improves understanding of carbon and nitrogen cycling in the upper ocean by constraining the export efficiencies through comprehensive time-series measurements.

Place, publisher, year, edition, pages
2013. Vol. 11, 495-510 p.
National Category
Oceanography, Hydrology, Water Resources
Research subject
Biogeochemistry
Identifiers
URN: urn:nbn:se:su:diva-97495DOI: 10.4319/lom.2013.11.495ISI: 000328880100002OAI: oai:DiVA.org:su-97495DiVA: diva2:681638
Projects
BEAM
Funder
Ecosystem Approach to the Baltic Sea (Upphört/Closed 2010)Swedish Research Council, 1-AA/GB 12291-301Mistra - The Swedish Foundation for Strategic Environmental Research, 98538Mistra - The Swedish Foundation for Strategic Environmental Research, SUCOZOMASwedish Environmental Protection Agency, 212-0508
Available from: 2013-12-20 Created: 2013-12-12 Last updated: 2017-12-06Bibliographically approved

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Gustafsson, ÖrjanGelting, JohanLarsson, Ulf
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Department of Applied Environmental Science (ITM)Department of Ecology, Environment and Plant Sciences
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