Comparison of biogeochemical dynamics in two time series sites of aNorth Atlantic Ocean site PAP and BATS a modeling approach

Plankton functional type (PFT) models are highly complex ecosystem models. Indeed, the large number of processes and plankton functional groups represented in these models make the network of interactions extremely complicated. Slight differences in parameterization or formulation of single processes, therefore, may drive these models to respond in a very different way to perturbations of the system. An evaluation of such a different responses can be very useful to understand the processes regulating the functioning of the ecosystem. In this study we analyze the sensitivity of the biological parameters in a PFT model (European Regional Seas Ecosystem Model, ERSEM) in respect to primary production and detrital export. The tests are done on a subset of key parameters that control ocean ecosystem growth in a 1-D formulation of ERSEM coupled with a turbulence model (General Ocean Turbulence Model, GOTM). Results are compared with observed data from two time-series sites Bermuda Atlantic Time-Series (BATS, 32.16 N 64.5 W) and Porcupine Abyssal Plain (PAP, 49 N 16 W). A particular focus on factors determining the timing and intensity of the bloom is also presented on the base of literature review and on 1D(GOTM-ERSEM)-3D(NEMO-ERSEM) model simulations comparison. The different processes evaluated are: i). winter convective mixing, ii) lateral advection: mesoscale and sub-mesoscale eddies, iii) turbolent mixing iv) decoupling between euphotic zone and mixed layer depth. The study presented here is carried out in the framework of the European project EURO-BASIN (European Basin-scale Analysis, Synthesis and Integration), where long term 3D simulation aimed to evaluate the variability of primary production and carbon export are planned. Parameterization in use by the 3D NEMO-ERSEM is referring to the global ocean, while simulations are planned for the North North Atlantic. This study aims to contribute to fulfill the development of a specific parameterization for the North Atlantic Ocean.
EGU General Assembly (2013)


Comparison of Productivity Plankton Types and Carbon Export Mechanisms in two Different Regimes of Subtropical North Atlantic a Modeling Study
Salihoğlu, Barış (2016-02-15)
Improved structure and mechanisms of carbon export and sequestration within marine ecosystem models is vital to better understand and predict changes in the global carbon cycle. We have implemented a 1D lower trophic ecosystem model at long-term time-series stations (BATS and ESTOC) in the North Atlantic for the years 1996-2000. We have investigated the dynamics of the productivity and carbon export, and mechanisms regulating them. Our simulations agree with the previous observations that show similar produ...
Comparison of continuous and pulsed pump and treat for mass transfer limited aquifers
Aksoy, Ayşegül (2004-01-01)
Numerical simulations of eutrophication processes in İzmir Bay with a coupled three dimensional eco-hydrodynamic model
Yelekçi, Özge; Fach Salihoğlu, Bettina Andrea; Ibello, Valeria; Department of Physical Oceanography (2013)
A three dimensional time-dependent coupled ecosystem model is applied to İzmir Bay for the first time. Delft3D modelling suite’s FLOW and ECO modules are adapted and tuned for the region. A reference model with a time frame of three years is produced that represents the current physical and biogeochemical status of the bay. Model skill assessment methods are used as a measure of model performance and to address the shortcomings of it. The hydrodynamics model is able to produce physical features in terms of ...
Simulation of Reinforced Concrete Member Response Using Lattice Model
Aydın, Beyazıt Bestami; Tuncay, Kağan; Binici, Barış (2019-09-01)
Lattice models are well suited for crack simulations; however, their use has been mostly limited to the fracture of plain concrete. In this study, a practical two-dimensional mesoscale lattice composed of overlapping elements was employed to simulate the monotonic response of reinforced concrete elements. The force-deformation response of each element is calibrated from direct tension tests. An explicit time integration technique with novel proportional-integral-derivative control is used to efficiently sim...
Explicit representation of spatial heterogeneity in reactive transport models: application to bioirrigated sediments
Meile, C; Tuncay, Kağan; Van Cappellen, P (Elsevier BV, 2003-05-01)
Existing reactive transport models represent aquatic sediments as one-dimensional systems. These models account for the predominantly vertical chemical gradients recorded by traditional pore water and solid sediment sampling techniques (e.g., cores, dialysis samplers). However, advances in sampling techniques, including the rapid development of in situ microprofilers, are providing increasingly detailed data sets, which highlight the laterally heterogeneous nature of the water-sediment interface. In particu...
Citation Formats
V. Ibello, B. Salihoğlu, and A. E. Kıdeyş, “Comparison of biogeochemical dynamics in two time series sites of aNorth Atlantic Ocean site PAP and BATS a modeling approach,” presented at the EGU General Assembly (2013), Vienna, Austria, 2013, Accessed: 00, 2021. [Online]. Available: