the acclimative biogeochemical model of the southern north sea
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2017
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Abstract
Ecosystem models often rely on heuristic descriptions of autotrophic 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
three-dimensional physical–biogeochemical model and the application 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 based 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 (SPM) 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 within the German Bight characterized by steep salinity; nutrient and
chlorophyll (Chl) gradients, as inferred from comparisons against observation data
from long-term monitoring stations; sparse in situ measurements; continuous
transects; and satellites. The model also displays skill in capturing the
formation of thin chlorophyll layers at the pycnocline, which is frequently observed
within the stratified regions during summer. A sensitivity analysis reveals
that the vertical distributions of phytoplankton concentrations estimated by
the model can be qualitatively sensitive to the description of the light
climate and dependence of sinking rates on the internal nutrient reserves. A
non-acclimative (fixed-physiology) version of the model predicted entirely
different vertical profiles, suggesting that accounting for physiological
flexibility might be relevant for a consistent representation of the vertical
distribution of phytoplankton biomass. Our results point to significant
variability in the cellular chlorophyll-to-carbon ratio (Chl : C) across
seasons and the coastal to offshore transition. Up to 3-fold-higher Chl : C
at the coastal areas in comparison to those at the offshore areas contribute
to the steepness of the chlorophyll gradient. The model also predicts much
higher phytoplankton concentrations at the coastal areas in comparison to its
non-acclimative equivalent. Hence, findings of this study provide evidence
for the relevance of physiological flexibility, here reflected by spatial
and seasonal variations in Chl : C, for a realistic description of
biogeochemical fluxes, particularly in the environments displaying strong
resource gradients.
| Reference Key |
kerimoglu2017biogeosciencesthe
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|---|---|
| Authors | ;O. Kerimoglu;R. Hofmeister;J. Maerz;J. Maerz;R. Riethmüller;K. W. Wirtz |
| Journal | tetrahedron letters |
| Year | 2017 |
| DOI |
10.5194/bg-14-4499-2017
|
| URL | |
| Keywords |
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