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| Titel |
Impact of the North Atlantic circulation on the climate change patterns of North Sea. |
| VerfasserIn |
Nikesh Narayan, Mortiz Mathis, Birgit Klein, Holger Klein, Uwe Mikolajewicz |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250149915
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| Publikation (Nr.) |
 EGU/EGU2017-14316.pdf |
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| Zusammenfassung |
| The physical properties of the North Sea are characterized by the exchange of water masses
with the North Atlantic at the northern boundary and Baltic Sea to the east. The combined
effects of localized forcing, tidal mixing and advection of water masses make the North Sea a
challenging study area. Previous investigations indicated a possibility that the variability of
the North Atlantic circulation and the strength of the sub-polar gyre (SPG) might influence
the physical properties of the North Sea. The assessment of the complex interaction between
the North Atlantic and the North Sea in a climate change scenario requires regionally
coupled global RCP simulations with enhanced resolution of the North Sea and
the North Atlantic. In this study we analyzed result from the regionally coupled
ocean-atmosphere-biogeochemistry model system (MPIOM-REMO-HAMOCC) with a
hydrodynamic (HD) model. The ocean model has a zoomed grid which provides the highest
resolution over the West European Shelf by shifting its poles over Chicago and
Central Europe. An index for the intensity of SPG was estimated by averaging the
barotropic stream function (ψ) over the North Atlantic. Various threshold values
for ψ were tested to define the strength of the SPG. These SPG indices have been
correlated with North Sea hydrographic parameters at various levels to identify areas
affected by SPG variability. The influence of the Atlantic’s eastern boundary current,
contributing more saline waters to the North West European shelf area is also investigated. |
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