Evidence for the predictability of changes in the stratospheric aerosol size following volcanic eruptions of diverse magnitudes using space-based instruments
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Published:2021-01-27
Issue:2
Volume:21
Page:1143-1158
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Thomason Larry W.ORCID, Kovilakam Mahesh, Schmidt AnjaORCID, von Savigny Christian, Knepp TravisORCID, Rieger LandonORCID
Abstract
Abstract. An analysis of multiwavelength stratospheric aerosol extinction
coefficient data from the Stratospheric Aerosol and Gas Experiment II and
III/ISS instruments is used to demonstrate a coherent relationship between
the perturbation in extinction coefficient in an eruption's main aerosol
layer and the wavelength dependence of that perturbation. This relationship
spans multiple orders of magnitude in the aerosol extinction coefficient of
stratospheric impact of volcanic events. The relationship is
measurement-based and does not rely on assumptions about the aerosol size
distribution. We note limitations on this analysis including that the
presence of significant amounts of ash in the main sulfuric acid aerosol
layer and other factors may significantly modulate these results. Despite
these limitations, the findings suggest an avenue for improving aerosol
extinction coefficient measurements from single-channel observations such as
the Optical Spectrograph and Infrared Imager System as they rely on a prior
assumptions about particle size. They may also represent a distinct avenue
for the comparison of observations with interactive aerosol models used in
global climate models and Earth system models.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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