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| Titel |
Influence of cross-shelf water transport on nutrients and phytoplankton in the East China Sea: a model study |
| VerfasserIn |
L. Zhao, X. Guo |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 7, no. 1 ; Nr. 7, no. 1 (2011-01-17), S.27-43 |
| Datensatznummer |
250004429
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| Publikation (Nr.) |
 copernicus.org/os-7-27-2011.pdf |
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| Zusammenfassung |
| A three dimensional coupled biophysical model was used to examine the supply
of oceanic nutrients to the shelf of the East China Sea (ECS) and its role
in primary production over the shelf. The model consisted of two parts: the
hydrodynamic module was based on a nested model with a horizontal resolution
of 1/18 degree, whereas the biological module was a lower trophic level
ecosystem model including two types of phytoplankton, three elements of
nutrients, and biogenic organic material. The model results suggested that
seasonal variations occurred in the distribution of nutrients and
chlorophyll a over the shelf of the ECS. After comparison with available
observed nutrients and chlorophyll a data, the model results were used to
calculate volume and nutrients fluxes across the shelf break. The annual
mean total fluxes were 1.53 Sv for volume, 9.4 kmol s−1 for DIN, 0.7 kmol s−1
for DIP, and 18.2 kmol s−1 for silicate. Two areas,
northeast of Taiwan and southwest of Kyushu, were found to be major source
regions of oceanic nutrients to the shelf. Although the onshore fluxes of
nutrients and volume both had apparent seasonal variations, the seasonal
variation of the onshore nutrient flux did not exactly follow that of the
onshore volume flux. Additional calculations in which the concentration of
nutrients in Kuroshio water was artificially increased suggested that the
oceanic nutrients were distributed in the bottom layer from the shelf break
to the region offshore of the Changjiang estuary from spring to summer and
appeared in the surface layer from autumn to winter. The calculations also
implied that the supply of oceanic nutrients to the shelf can change the
consumption of pre-existing nutrients from rivers. The response of primary
production over the shelf to the oceanic nutrients was confirmed not only in
the surface layer (mainly at the outer shelf and shelf break in winter and
in the region offshore of the Changjiang estuary in summer) but also in the
subsurface layer over the shelf from spring to autumn. |
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