Volcanic Imprints in the North Atlantic Climate Variability
Abstract
Volcanic eruptions have the ability to disturb the Earth's energy balance and alter the meridional temperature gradient. This influences the atmospheric circulation and can lead to a dynamic climate response through atmosphere-ocean coupling. However, the mechanism driving these dynamic interactions is not clear. By investigating the modeled climate response after both equatorial (EQ) and high latitude (north hemisphere, NH) volcanic eruptions our previous findings report of a prolonged dynamic short-term response in addition to the dynamic decadal response, where a weaker polar vortex seem to be associated with NH eruptions while stronger polar vortex is associated with EQ eruptions. We extend this modeling investigation in situ by identifying the signatures of the four main modes of variability over the North Atlantic in the stable water isotopes of GNIP (Global Network of Isotopes in Precipitation) where the short-term volcanic response in GNIP proves to be in support of model results. We also investigate the stable isotope archives of Greenland ice cores where their analysis reveal a spatial and temporal climate response after both EQ and NH eruptions, further complementing the proposed difference in the dynamic mechanism initiated after both low and high latitude eruptions.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.A51H2262G
- Keywords:
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- 3305 Climate change and variability;
- ATMOSPHERIC PROCESSESDE: 3337 Global climate models;
- ATMOSPHERIC PROCESSESDE: 3339 Ocean/atmosphere interactions;
- ATMOSPHERIC PROCESSESDE: 4504 Air/sea interactions;
- OCEANOGRAPHY: PHYSICAL