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Titel |
Frequency- or amplitude-dependent effects of the Atlantic meridional overturning on the tropical Pacific Ocean |
VerfasserIn |
Lianke te Raa, Geert Jan van Oldenborgh, Henk Dijkstra, Sjoukje Philip |
Konferenz |
EGU General Assembly 2010
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 12 (2010) |
Datensatznummer |
250035884
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Zusammenfassung |
Using the ECHAM5/MPI-OM model, we study the relation between the variations in the
Atlantic meridional overturning circulation (AMOC) and both the Pacific sea surface
temperature (SST) and the El Niño-Southern Oscillation (ENSO) amplitude. In
a 17-member 20C3M/SRES-A1b ensemble for 1950–2100 the Pacific response
to AMOC variations on different time scales and amplitudes is considered. The
Pacific response to AMOC variations associated with the Atlantic Multidecadal
Oscillation (AMO) is very small. In a 5-member hosing ensemble where the AMOC
collapses due to a large freshwater anomaly, the Pacific SST response is large and in
agreement with previous work. Our results show that the modelled connection between
AMOC and ENSO depends very strongly on the frequency and/or the modelled
amplitude of the AMOC variations. Interannual AMOC variations, decadal AMOC
variations and an AMOC collapse lead to entirely different responses in the Pacific
Ocean. |
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