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  The initial dispersal and radiative forcing of a Northern Hemisphere mid-latitude super volcano: a model study

Timmreck, C., & Graf, H. F. (2006). The initial dispersal and radiative forcing of a Northern Hemisphere mid-latitude super volcano: a model study. Atmospheric Chemistry and Physics, 6, 35-49. doi:10.5194/acp-6-35-2006.

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ACP_6-35.pdf (Publisher version), 3MB
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 Creators:
Timmreck, C.1, 2, Author           
Graf, H. F.1, Author           
Affiliations:
1The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society, ou_913550              
2Middle and Upper Atmosphere, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society, ou_913574              

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 Abstract: The chemistry climate model MAECHAM4/ CHEM with interactive and prognostic volcanic aerosol and ozone was used to study the initial dispersal and radiative forcing of a possible Northern Hemisphere mid-latitude super eruption. Tropospheric climate anomalies are not analysed since sea surface temperatures are kept fixed. Our experiments show that the global dispersal of a super eruption located at Yellowstone, Wy. is strongly dependent on the season of the eruption. In Northern Hemisphere summer the volcanic cloud is transported westward and preferentially southward, while in Northern Hemisphere winter the cloud is transported eastward and more northward compared to the summer case. Aerosol induced heating leads to a more global spreading with a pronounced cross equatorial transport. For a summer eruption aerosol is transported much further to the Southern Hemisphere than for a winter eruption. In contrast to Pinatubo case studies, strong cooling tendencies appear with maximum peak values of less than −1.6 K/day three months after the eruption in the upper tropical stratosphere. This strong cooling effect weakens with decreasing aerosol density over time and initially prevents the aerosol laden air from further active rising. All-sky net radiative flux changes of less than −32 W/m2 at the surface are about a factor of 6 larger than for the Pinatubo eruption. Large positive flux anomalies of more than 16 W/m2 are found in the first months in the tropics and sub tropics. These strong forcings call for a fully coupled ocean/atmosphere/chemistry model to study climate sensitivity to such a super-eruption.

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Language(s): eng - English
 Dates: 2006-01-04
 Publication Status: Issued
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 Rev. Type: Peer
 Identifiers: eDoc: 256478
ISI: 000234391000001
DOI: 10.5194/acp-6-35-2006
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Title: Atmospheric Chemistry and Physics
  Alternative Title : Atmos. Chem. Phys.
Source Genre: Journal
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Pages: - Volume / Issue: 6 Sequence Number: - Start / End Page: 35 - 49 Identifier: ISSN: 1680-7324