Modeling the stratospheric warming following the Mt. Pinatubo eruption: uncertainties in aerosol extinctions

Arfeuille, Florian Xavier; Luo, B. P.; Heckendorn, P.; Weisenstein, D.; Sheng, J. X.; Rozanov, E.; Schraner, M.; Brönnimann, Stefan; Thomason, L. W.; Peter, T. (2013). Modeling the stratospheric warming following the Mt. Pinatubo eruption: uncertainties in aerosol extinctions. Atmospheric chemistry and physics, 13(22), pp. 11221-11234. European Geosciences Union 10.5194/acp-13-11221-2013

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In terms of atmospheric impact, the volcanic eruption of Mt. Pinatubo (1991) is the best characterized large eruption on record. We investigate here the model-derived stratospheric warming following the Pinatubo eruption as derived from SAGE II extinction data including recent improvements in the processing algorithm. This method, termed SAGE_4λ, makes use of the four wavelengths (385, 452, 525 and 1024 nm) of the SAGE II data when available, and uses a data-filling procedure in the opacity-induced "gap" regions. Using SAGE_4λ, we derived aerosol size distributions that properly reproduce extinction coefficients also at much longer wavelengths. This provides a good basis for calculating the absorption of terrestrial infrared radiation and the resulting stratospheric heating. However, we also show that the use of this data set in a global chemistry–climate model (CCM) still leads to stronger aerosol-induced stratospheric heating than observed, with temperatures partly even higher than the already too high values found by many models in recent general circulation model (GCM) and CCM intercomparisons. This suggests that the overestimation of the stratospheric warming after the Pinatubo eruption may not be ascribed to an insufficient observational database but instead to using outdated data sets, to deficiencies in the implementation of the forcing data, or to radiative or dynamical model artifacts. Conversely, the SAGE_4λ approach reduces the infrared absorption in the tropical tropopause region, resulting in a significantly better agreement with the post-volcanic temperature record at these altitudes.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geography > Physical Geography > Unit Climatology
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Institute of Geography

UniBE Contributor:

Arfeuille, Florian Xavier and Brönnimann, Stefan

Subjects:

900 History > 910 Geography & travel

ISSN:

1680-7316

Publisher:

European Geosciences Union

Language:

English

Submitter:

Monika Wälti-Stampfli

Date Deposited:

28 Nov 2013 11:07

Last Modified:

01 Sep 2015 17:34

Publisher DOI:

10.5194/acp-13-11221-2013

BORIS DOI:

10.7892/boris.39366

URI:

https://boris.unibe.ch/id/eprint/39366

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