 |
| Titel |
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 |
| VerfasserIn |
M. Gregoire, J. M. Beckers |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 1, no. 1 ; Nr. 1, no. 1 (2004-10-05), S.33-61 |
| Datensatznummer |
250000070
|
| Publikation (Nr.) |
 copernicus.org/bg-1-33-2004.pdf |
|
|
|
|
|
| Zusammenfassung |
| 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
130gCm-2yr-1 for the whole basin, 220gCm-2yr-1 for
the shelf and 40gCm-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
1010molyr-1. This POC is definitely lost for the system and
represents 2% of the annual primary production of the open sea. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|