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| Titel |
How does atmospheric forcing drive the variability of the Arctic/North Atlantic exchanges? |
| VerfasserIn |
C. Lique, A. M. Treguier, C. Herbaut, T. Penduff |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250021294
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| Zusammenfassung |
| We investigate the variability of the exports of volume, heat, freshwater and sea-ice from the
Arctic Ocean to the North Atlantic, which is known to possibly affect the deep convection
regions and thus the global thermohaline circulation. An Arctic/North Atlantic regional
ocean/sea ice model with an average resolution of 25 km grid in the Arctic Ocean is used in
this regard. Our reference simulation over the 1958-2001 period, forced by ERA40
atmospheric fields, is shown to represent fairly well the Arctic/North Atlantic exchanges,
compared to available observations. We find that the volume transports on each sides of
Greenland, through Davis Strait and Fram Strait, are strongly anticorrelated, which is
possibly due to the variability of the wind stress over the Arctic. The relative influences of the
different atmospheric fields (wind stress, heat and salt flux) on the exchanges variability are
also examined, as we run sensitivity experiments where interannual variability of the
different forcing is globally or regionally removed. We find that the interannual
frequency is mainly wind driven, and we discuss the mechanisms that drive lower
frequencies. |
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