Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
doi:10.5194/bg-2017-104
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
30 Mar 2017
Review status
This discussion paper is under review for the journal Biogeosciences (BG).
A novel acclimative biogeochemical model and its implementation to the southern North Sea
Onur Kerimoglu1, Richard Hofmeister1, Joeran Maerz1,a, and Kai Wenzel Wirtz1 1Institute of Coastal Research, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany
apresent address: Max Planck Institute for Meteorology, Hamburg, Germany
Abstract. Ecosystem models often rely on heuristic descriptions of autotroph growth that fail to reproduce various stationary and dynamic states of phytoplankton cellular composition observed in laboratory experiments. Here, we present the integration of an advanced phytoplankton growth model within a coupled 3-dimensional physical-biogeochemical model, and the implementation of the model system to the Southern North Sea (SNS) defined on a relatively high resolution (~ 1.5–4.5 km) curvilinear grid. The autotrophic growth model, recently introduced by Wirtz and Kerimoglu (2016), is built up on a set of novel concepts for the allocation of internal resources and operation of cellular metabolism. The coupled model system consists of the general estuarine transport model (GETM) as the hydrodynamical driver, a lower trophic level model and a simple sediment diagenesis model. We force the model system with realistic atmospheric and riverine fluxes, background turbidity caused by suspended particulate matter and open ocean boundary conditions. For a simulation for the period 2000–2010, we show that the model system satisfactorily reproduces the physical and biogeochemical states of the system, as inferred from comparisons against data from long-term monitoring stations, sparse measurements, continuous transects, and remote sensing data. In particular, the model shows high skill both in coastal and off shore waters, and captures the steep gradients in nutrient and chlorophyll concentrations observed prevalently across the coastal transition zone. We show that the cellular chlorophyll to carbon ratio show significant seasonal and lateral variability, the latter amplifying the steepness of the transitional chlorophyll gradient, thus, pointing to the relevance of resolving the physiological acclimation processes for an accurate description of biogeochemical fluxes.

Citation: Kerimoglu, O., Hofmeister, R., Maerz, J., and Wenzel Wirtz, K.: A novel acclimative biogeochemical model and its implementation to the southern North Sea, Biogeosciences Discuss., doi:10.5194/bg-2017-104, in review, 2017.
Onur Kerimoglu et al.
Onur Kerimoglu et al.
Onur Kerimoglu et al.

Viewed

Total article views: 249 (including HTML, PDF, and XML)

HTML PDF XML Total BibTeX EndNote
183 44 22 249 3 22

Views and downloads (calculated since 30 Mar 2017)

Cumulative views and downloads (calculated since 30 Mar 2017)

Viewed (geographical distribution)

Total article views: 249 (including HTML, PDF, and XML)

Thereof 247 with geography defined and 2 with unknown origin.

Country # Views %
  • 1

Saved

Discussed

Latest update: 28 May 2017
Publications Copernicus
Download
Short summary
In this study, we present a coupled physical-biogeochemical model, in which the acclimation of autotrophs to their resource environment is resolved based on optimality arguments. The model is implemented to the southern North Sea, a shallow coastal system. Based on comparisons with multiple data sources, we show that the model can reproduce the variability in the system for the period 2000–2010 and analyze the mechanisms driving the large-scale, persistent coastal gradients in the system.
In this study, we present a coupled physical-biogeochemical model, in which the acclimation of...
Share