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| Titel |
Volcanic effect on the tropical sea surface temperature in a millennium coupled model simulation |
| VerfasserIn |
H.-G. Lim, S.-W. Yeh |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250062487
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| Zusammenfassung |
| This study examines the response of El Niño-Southern Oscillation (ENSO) to volcanic event
using a millennium simulation of coupled general circulation model forced by both natural
(solar forcing and volcanic forcing) and anthoropogenic (CO2 and CH4) forcing in the period
of 1000-1999 AD (ERIK simulation). It is found that the SST anomalies in the next winter of
volcanic eruptions are characterized by positive SST anomalies in the eastern tropical Pacific
(i.e., El Nino), in addition, their amplitude is proportional with the magnitude of volcanic
forcing. Our further analysis suggests that there exists a threshold magnitude of volcanic
eruptions to lead El Nino-like state in the tropical Pacific in which the change of effective
solar forcing should be above 15W/m2 ~20 W/m2. In other words, such amount of
radiative forcing is able to change the mean state of tropical Pacific. We estimate the
concentration of greenhouse gases such as CO2 based on its radiative forcing efficiency.. |
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