Actions
  • shareshare
  • link
  • cite
  • add
add
auto_awesome_motion View all 2 versions
Other research product . Other ORP type . 2018

Fluxes of carbon and nutrients to the Iceland Sea surface layer and inferred primary productivity and stoichiometry

Jeansson, E.; Bellerby, R. G. J.; Skjelvan, I.; Frigstad, H.; Ólafsdóttir, S. R.; Olafsson, J.;
Open Access
English
Published: 27 Sep 2018
Publisher: Copernicus Publications
Abstract

This study evaluates long-term mean fluxes of carbon and nutrients to the upper 100 m of the Iceland Sea. The study utilises hydro-chemical data from the Iceland Sea time series station (68.00° N, 12.67° W), for the years between 1993 and 2006. By comparing data of dissolved inorganic carbon (DIC) and nutrients in the surface layer (upper 100 m), and a sub-surface layer (100–200 m), we calculate monthly deficits in the surface, and use these to deduce the long-term mean surface layer fluxes that affect the deficits: vertical mixing, horizontal advection, air–sea exchange, and biological activity. The deficits show a clear seasonality with a minimum in winter, when the mixed layer is at the deepest, and a maximum in early autumn, when biological uptake has removed much of the nutrients. The annual vertical fluxes of DIC and nitrate amounts to 2.9 ± 0.5 and 0.45 ± 0.09 mol m−2 yr−1, respectively, and the annual air–sea uptake of atmospheric CO2 is 4.4 ± 1.1 mol C m−2 yr−1. The biologically driven changes in DIC during the year relates to net community production (NCP), and the net annual NCP corresponds to export production, and is here calculated as 7.3 ± 1.0 mol C m−2 yr−1. The typical, median C : N ratio during the period of net community uptake is 9.0, and clearly higher than the Redfield ratio, but is varying during the season.

60 references, page 1 of 6

Anderson, L. A. and Sarmiento, J. L.: Redfield ratios of remineralization determined by nutrient data analysis, Global Biogeochem. Cy., 8, 65-80, 1994.

Anderson, L. G., Drange, H., Chierici, M., Fransson, A., Johannessen, T., Skjelvan, I., and Rey, F.: Annual carbon fluxes in the upper Greenland Sea based on measurements and a box-model approach, Tellus B, 52, 1013-1024, 2000. [OpenAIRE]

Astthorsson, O. S., Gislason, A., and Jonsson, S.: Climate variability and the Icelandic marine ecosystem, Deep-Sea Res. PT II, 54, 2456-2477, 2007.

Banse, K.: Uptake of inorganic carbon and nitrate by marine plankton and the Redfield Ratio, Global Biogeochem. Cy., 8, 81-84, 1994.

Bathmann, U. V., Peinert, R., Noji, T. T., and Bodungen, B. V.: Pelagic origin and fate of sedimenting particles in the Norwegian Sea, Prog. Oceanogr., 24, 117-125, 1990.

Bodungen, B. V., Anita, A., Bauerfeind, E., Haupt, O., Koeve, W., Machado, E., Peeken, I., Peinert, R., Reitmeier, S., Thomsen, C., Voss, M., Wunsch, M., Zeller, U., and Zeitzschel, B.: Pelagic processes and vertical flux of particles: an overview of a longterm comparative study in the Norwegian Sea and Greenland Sea, Geol. Rundsch., 84, 11-27, 1995. [OpenAIRE]

Church, M. J., Lomas, M. W., and Muller-Karger, F.: Sea change: Charting the course for biogeochemical ocean time-series research in a new millennium, Deep-Sea Res. PT II, 93, 2-15, 2013.

Cooper, D. J., Watson, A. J., and Ling, R. D.: Variations of PCO2 along a North Atlantic shipping route (UK to the Caribbean): A year of automated observations, Mar. Chem., 60, 147-164, 1998.

Daly, K. L., Wallace, D. W. R., Smith, W. O., Jr., Skoog, A., Lara, R., Gosselin, M., Falck, E., and Yager, P. L.: Non-Redfield carbon and nitrogen cycling in the Arctic: Effects of ecosystem structure and dynamics, J. Geophys. Res., 104, 3185-3199, 1999. [OpenAIRE]

de Boyer Montégut, C., Madec, G., Fischer, A. S., Lazar, A., and Iudicone, D.: Mixed layer depth over the global ocean: An examination of profile data and a profile-based climatology, J. Geophys. Res., 109, C12003, doi:10.1029/2004JC002378, 2004.

Funded by
EC| CARBOCHANGE
Project
CARBOCHANGE
Changes in carbon uptake and emissions by oceans in a changing climate
  • Funder: European Commission (EC)
  • Project Code: 264879
  • Funding stream: FP7 | SP1 | ENV
,
EC| EURO-BASIN
Project
EURO-BASIN
European Union Basin-scale Analysis, Synthesis and Integration (EURO-BASIN)
  • Funder: European Commission (EC)
  • Project Code: 264933
  • Funding stream: FP7 | SP1 | ENV
,
EC| GREENSEAS
Project
GREENSEAS
Development of global plankton data base and model system for eco-climate early warning
  • Funder: European Commission (EC)
  • Project Code: 265294
  • Funding stream: FP7 | SP1 | ENV
Related to Research communities
European Marine Science Marine Environmental Science : Changes in carbon uptake and emissions by oceans in a changing climate
moresidebar