Stratospheric aerosol evolution after Pinatubo simulated with a coupled size-resolved aerosol–chemistry–climate model, SOCOL-AERv1.0
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Published:2018-07-06
Issue:7
Volume:11
Page:2633-2647
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ISSN:1991-9603
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Container-title:Geoscientific Model Development
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language:en
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Short-container-title:Geosci. Model Dev.
Author:
Sukhodolov Timofei, Sheng Jian-XiongORCID, Feinberg AryehORCID, Luo Bei-Ping, Peter Thomas, Revell LauraORCID, Stenke AndreaORCID, Weisenstein Debra K.ORCID, Rozanov EugeneORCID
Abstract
Abstract. We evaluate how the coupled
aerosol–chemistry–climate model SOCOL-AERv1.0 represents the influence of
the 1991 eruption of Mt. Pinatubo on stratospheric aerosol properties and
atmospheric state. The aerosol module is coupled to the radiative and
chemical modules and includes comprehensive sulfur chemistry and
microphysics, in which the particle size distribution is represented by 40
size bins with radii spanning from 0.39 nm to 3.2 µm. SOCOL-AER
simulations are compared with satellite and in situ measurements of aerosol
parameters, temperature reanalyses, and ozone observations. In addition to
the reference model configuration, we performed series of sensitivity
experiments looking at different processes affecting the aerosol layer. An
accurate sedimentation scheme is found to be essential to prevent particles
from diffusing too rapidly to high and low altitudes. The aerosol radiative
feedback and the use of a nudged quasi-biennial oscillation help to keep
aerosol in the tropics and significantly affect the evolution of the
stratospheric aerosol burden, which improves the agreement with observed
aerosol mass distributions. The inclusion of van der Waals forces in the
particle coagulation scheme suggests improvements in particle effective
radius, although other parameters (such as aerosol longevity) deteriorate.
Modification of the Pinatubo sulfur emission rate also improves some aerosol
parameters, while it worsens others compared to observations. Observations
themselves are highly uncertain and render it difficult to conclusively judge
the necessity of further model reconfiguration. The model revealed problems
in reproducing aerosol sizes above 25 km and also in capturing certain
features of the ozone response. Besides this, our results show that SOCOL-AER
is capable of predicting the most important global-scale atmospheric effects
following volcanic eruptions, which is also a prerequisite for an improved
understanding of solar geoengineering effects from sulfur injections to the
stratosphere.
Publisher
Copernicus GmbH
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