Influence of nutrient utilization and remineralization stoichiometry on phytoplankton species and carbon export: A modelling study at BATS.

Salihoglu, B., Garcon, V., Oschlies, Andreas and Lomas, M. W. (2008) Influence of nutrient utilization and remineralization stoichiometry on phytoplankton species and carbon export: A modelling study at BATS. Deep Sea Research Part I: Oceanographic Research Papers, 55 (1). pp. 73-107. DOI 10.1016/j.dsr.2007.09.010.

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The primary objective of this research is to understand the underlying mechanisms of the time-varying flux of carbon in the Sargasso Sea. To address this objective, a one-dimensional multi-component lower trophic level ecosystem model that includes detailed algal physiology as well as nutrient cycles is used at the Bermuda Atlantic Time-series Study (BATS, 31∘40′N31∘40′N, 64∘10′W64∘10′W) site. In this model autotrophic growth is represented by three algal groups and the cell quota approach is used to estimate algal growth and nutrient uptake. This model is tested and evaluated for year 1998 using the bimonthly BATS cruise data. Results show that phosphorus and dissolved organic matter (DOM) are necessary compartments to correctly simulate organic elemental cycles at the BATS site. Model results show that autotrophic eukaryotes and cyanobacteria (i.e. Prochlorococcus and Synechococcus) are the most abundant algal groups and are responsible for 63% and 33% of carbon production in the region, respectively. Sensitivity analyses show that the annual contribution of nitrogen fixation and atmospheric nitrogen deposition to new production is approximately 9% and 3%, respectively. However, the recycled nitrogen and phosphorus are important components of the ecosystem dynamics because sustained growth of algal groups depends on remineralized nutrients which accounts for 75% of the annual carbon production. Nutrient uptake and remineralization stoichiometry can play an important role in determining the surface ocean nutrient distribution. Model results suggest phosphate limitation even during the spring bloom. Phosphate may thus limit the growth of all algal groups throughout the year.

Document Type: Article
Keywords: Biogeochemical modeling; Nutrient cycle; Carbon cycle; Algal groups; BATS
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.dsr.2007.09.010
ISSN: 0967-0637
Projects: Future Ocean
Date Deposited: 03 Dec 2008 16:51
Last Modified: 01 Nov 2016 12:27

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