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Impact of global warming on the rise of volcanic plumes and implications for future volcanic aerosol forcing

Aubry, Thomas J., Jellinek, A. Mark, Degruyter, Wim, Bonadonna, Costanza, Radic, Valentina, Clyne, Margot and Quainoo, Adjoa 2016. Impact of global warming on the rise of volcanic plumes and implications for future volcanic aerosol forcing. Journal of Geophysical Research: Atmospheres 121 (22) , 13,326-13,351. 10.1002/2016JD025405
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Abstract

Volcanic eruptions have a significant impact on climate when they inject sulfur gases into the stratosphere. The dynamics of eruption plumes is also affected by climate itself, as atmospheric stratification impacts plumes height. We use an integral plume model to assess changes in volcanic plume maximum rise heights as a consequence of global warming, with atmospheric conditions from an ensemble of global climate models (GCM), using three representative concentration pathways (RCP) scenarios. Predicted changes in atmospheric temperature profiles decrease the heights of tropospheric and lowermost stratospheric volcanic plumes and increase the tropopause height, for the RCP4.5 and RCP8.5 scenarios in the coming three centuries. Consequently, the critical mass eruption rate required to cross the tropopause increases by up to a factor 3 for tropical regions, and up to 2 for high-latitude regions. A number of recent lower stratospheric plumes, mostly in the tropics (e.g., Merapi, 2010), would be expected to not cross the tropopause starting from the late 21st century, under RCP4.5 and RCP8.5 scenario. This effect could result in a ' 5 − 25% decrease in the average SO2 flux into the stratosphere carried by small plumes, which frequency is larger than the rate of decay of volcanic stratospheric aerosol, and a ' 2 − 12% decrease of the total flux. Our results suggest the existence of a positive feedback between climate and volcanic aerosol forcing. Such feedback may have minor implications for global warming rate but can prove to be important to understand the long-term evolution of volcanic atmospheric inputs.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > Q Science (General)
Publisher: American Geophysical Union
ISSN: 2169-897X
Date of First Compliant Deposit: 17 November 2016
Date of Acceptance: 21 October 2016
Last Modified: 04 Jun 2017 19:26
URI: http://orca.cf.ac.uk/id/eprint/96243

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