Recent anthropogenic increases in SO2 from Asia have minimal impact on stratospheric aerosol. Issue 5 (13th March 2013)

• Record Type: Journal Article
• Authors: Neely, R. R.; Toon, O. B.; Solomon, S.; Vernier, J.‐P.; Alvarez, C.; English, J. M.; Rosenlof, K. H.; Mills, M. J.; Bardeen, C. G.; Daniel, J. S.; Thayer, J. P.
• Is Part Of: Geophysical research letters. Volume 40:Issue 5(2013:Mar.)
• Page Start: 999
• Page End: 1004
• Publication Date: 2013-03-13
• Subjects: Geophysics -- Periodicals; Planets -- Periodicals; Lunar geology -- Periodicals; 550
• DOI: 10.1002/grl.50263
• Languages: English
• ISSNs: 0094-8276

Abstract

<abstract abstract-type="main" id="grl50263-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p id="grl50263-para-0002">[1] Observations suggest that the optical depth of the stratospheric aerosol layer between 20 and 30 km has increased 4–10% per year since 2000, which is significant for Earth's climate. Contributions to this increase both from moderate volcanic eruptions and from enhanced coal burning in Asia have been suggested. Current observations are insufficient to attribute the contribution of the different sources. Here we use a global climate model coupled to an aerosol microphysical model to partition the contribution of each. We employ model runs that include the increases in anthropogenic sulfur dioxide (SO₂) over Asia and the moderate volcanic explosive injections of SO₂ observed from 2000 to 2010. Comparison of the model results to observations reveals that moderate volcanic eruptions, rather than anthropogenic influences, are the primary source of the observed increases in stratospheric aerosol.</p> </abstract>