期刊
GEOPHYSICAL RESEARCH LETTERS
卷 40, 期 5, 页码 999-1004出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/grl.50263
关键词
Stratosphere; Asian Monsoon; Volcanoes; WACCM
资金
- NOAA/ESRL-CIRES Graduate Fellowship program
- NASA [NNX09AK71G]
- NSF [AGS-1135446, ATM-0856007]
- National Science Foundation [CNS-0821794]
- University of Colorado Boulder
- NASA [NNX09AK71G, 114761] Funding Source: Federal RePORTER
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [0856007] Funding Source: National Science Foundation
Observations suggest that the optical depth of the stratospheric aerosol layer between 20 and 30km has increased 410% 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.
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