Winter bloom of the diatom Nitzschia delicatula in the open waters of the Black Sea

As, Mikaelyan

doi:10.3354/meps129241

Cited by 24 publications

(12 citation statements)

References 18 publications

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“…These values compare reasonably well with the in-situ measurements of 0.2-1.5 g C m −2 d −1 made by Vedernikov and Demidov (1993) (Fig. 7) as well as with the observations of 0.2-0.96 g C m −2 d −1 (mean 0.4 g C m −2 d −1 ) realized by Mikaelyan (1995) at different stations of the central basin for the period February-March 1991. Model results show that the primary production is at maximum in the centers of the main cyclonic gyres of the central basin and decreases towards the periphery.…”

Section: Primary Production Of the Central Basinsupporting

confidence: 92%

Modeling the nitrogen fluxes in the Black Sea using a 3D coupled hydrodynamical-biogeochemical model: transport versus biogeochemical processes, exchanges across the shelf break and comparison of the shelf and deep sea ecodynamics

Grégoire¹,

Beckers²

2004

Preprint

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Abstract. A 6-compartment biogeochemical model of nitrogen cycling and plankton productivity has been coupled with a 3D general circulation model in an enclosed environment (the Black Sea) so as to quantify and compare, on a seasonal and annual scale, the typical internal biogeochemical functioning of the shelf and of the deep sea as well as to estimate the nitrogen and water exchanges at the shelf break. Model results indicate that the annual nitrogen net export to the deep sea roughly corresponds to the annual load of nitrogen discharged by the rivers on the shelf. The model estimated vertically integrated gross annual primary production is 130 g C m-2yr-1 for the whole basin, 220 g C m-2yr-1 for the shelf and 40 g C m-2yr-1 for the central basin. In agreement with sediment trap observations, model results indicate a rapid and efficient recycling of particulate organic matter in the sub-oxic portion of the water column (60-80m) of the open sea. More than 95% of the PON produced in the euphotic layer is recycled in the upper 100m of the water column, 87% in the upper 80 m and 67% in the euphotic layer. The model estimates the annual export of POC towards the anoxic layer to 4 1010mol yr-1. This POC is definitely lost for the system and represents 2% of the annual primary production of the open sea.

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Section: Primary Production Of the Central Basinsupporting

confidence: 92%

Modeling the nitrogen fluxes in the Black Sea using a 3D coupled hydrodynamical-biogeochemical model: transport versus biogeochemical processes, exchanges across the shelf break and comparison of the shelf and deep sea ecodynamics

Grégoire¹,

Beckers²

2004

Preprint

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“…[35] In agreement with field observations [Vedernikov and Demidov, 1993;Mikaelyan, 1995], in the main part of the central basin, where the permanent pycnocline moves to the sea surface and inhibits the penetration at depth of the vertical mixing (Figure 13), the vertical extension of the bloom does not exceed 35-40 m (Figure 14) because of the light limitation of the phytoplankton development below the pycnocline. Conversely, in coastal areas and on the shelf, phytoplankton populations extend vertically until 70 -80 m.…”

Section: Wintersupporting

confidence: 84%

Modeling the nitrogen cycling and plankton productivity in the Black Sea using a three‐dimensional interdisciplinary model

et al. 2004

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[1] A six-compartment ecosystem model defined by a simple nitrogen cycle is coupled with a general circulation model in the Black Sea so as to examine the seasonal variability of the ecohydrodynamics. Model results show that the annual cycle of the biological productivity of the whole basin is characterized by the presence of a winter-early spring bloom. In all the regions this bloom precedes the onset of the seasonal thermocline and occurs as soon as the vertical winter mixing decreases. Phytoplankton development starts in winter in the central basin, while in coastal areas (except in the river discharge area) it begins in early spring. In the Danube's discharge area and along the western coast, where surface waters are almost continuously enriched in nutrient by river inputs, the phytoplankton development is sustained during the whole year at the surface. The seasonal variability of the northwestern shelf circulation induced by the seasonal variations in the Danube discharge and the wind stress intensity has been found to have a major impact on the primary production repartition of the area. In the central basin the primary production in the surface layer relies essentially on nutrients being entrained in the upper layer from below. Simulated phytoplankton concentrations are compared with satellite and field data. It has been found that the model is able to reproduce the main characteristics of the space-time evolution of the Black Sea's biological productivity but underestimates the phytoplankton biomass especially in regions extremely rich in nutrients such as the Danube discharge area. Citation: Grégoire, M., K. Soetaert, N. Nezlin, and A. Kostianoy (2004), Modeling the nitrogen cycling and plankton productivity in the Black Sea using a three-dimensional interdisciplinary model,

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“…These values compare reasonably well with the in-situ measurements of 0.2-1.5 g C m −2 d −1 made by Vedernikov and Demidov (1993) (Fig. 7) as well as with the observations of 0.2-0.96 g C m −2 d −1 (mean 0.4 g C m −2 d −1 ) realized by Mikaelyan (1995) at different stations of the central basin for the period FebruaryMarch 1991. Model results show that the primary production is at maximum in the centers of the main cyclonic gyres of the central basin and decreases towards the periphery.…”

Section: Primary Production Of the Central Basinsupporting

confidence: 79%

Modeling the nitrogen fluxes in the Black Sea using a 3D coupledhydrodynamical-biogeochemical model: transport versus biogeochemicalprocesses, exchanges across the shelf break and comparison of the shelf anddeep sea ecodynamics

Grégoire

Beckers

2004

Biogeosciences

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Abstract.A 6-compartment biogeochemical model of nitrogen cycling and plankton productivity has been coupled with a 3D general circulation model in an enclosed environment (the Black Sea) so as to quantify and compare, on a seasonal and annual scale, the typical internal biogeochemical functioning of the shelf and of the deep sea as well as to estimate the nitrogen and water exchanges at the shelf break. Model results indicate that the annual nitrogen net export to the deep sea roughly corresponds to the annual load of nitrogen discharged by the rivers on the shelf.The model estimated vertically integrated gross annual primary production is 130 g C m −2 yr −1 for the whole basin, 220 g C m −2 yr −1 for the shelf and 40 g C m −2 yr −1 for the central basin. In agreement with sediment trap observations, model results indicate a rapid and efficient recycling of particulate organic matter in the sub-oxic portion of the water column (60-80 m) of the open sea. More than 95% of the PON produced in the euphotic layer is recycled in the upper 100 m of the water column, 87% in the upper 80 m and 67% in the euphotic layer. The model estimates the annual export of POC towards the anoxic layer to 4 10 10 mol yr −1 . This POC is definitely lost for the system and represents 2% of the annual primary production of the open sea.

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Winter bloom of the diatom Nitzschia delicatula in the open waters of the Black Sea

Cited by 24 publications

References 18 publications

Modeling the nitrogen fluxes in the Black Sea using a 3D coupled hydrodynamical-biogeochemical model: transport versus biogeochemical processes, exchanges across the shelf break and comparison of the shelf and deep sea ecodynamics

Modeling the nitrogen fluxes in the Black Sea using a 3D coupled hydrodynamical-biogeochemical model: transport versus biogeochemical processes, exchanges across the shelf break and comparison of the shelf and deep sea ecodynamics

Modeling the nitrogen cycling and plankton productivity in the Black Sea using a three‐dimensional interdisciplinary model

Modeling the nitrogen fluxes in the Black Sea using a 3D coupledhydrodynamical-biogeochemical model: transport versus biogeochemicalprocesses, exchanges across the shelf break and comparison of the shelf anddeep sea ecodynamics

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