期刊
GEOPHYSICAL RESEARCH LETTERS
卷 48, 期 24, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021GL094427
关键词
radiative forcing; stratospheric aerosols; organic aerosol; refractive index; mixing state
资金
- NASA [80NSSC19K0326]
- NSF [8920706, 9732547, 0216558, 0437406, 1011827]
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [0437406, 8920706] Funding Source: National Science Foundation
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [0216558, 9732547] Funding Source: National Science Foundation
Observations and models show a significant organic component in stratospheric aerosols, but the optical properties and mixing state of this component with sulfuric acid are uncertain. Organic components could have substantial impacts on aerosol optical depth in the absence of large volcanic sulfur emissions. The range of shortwave radiative forcing results under different scenarios calls for better understanding of aerosol properties in the stratosphere.
Both observations and recent model results reveal a significant organic component in stratospheric aerosols. However, intrinsic optical properties (i.e., complex refractive index) of this organic component and the mixing state of organic and ubiquitous sulfuric acid components are quite uncertain. We examine the effects of different complex refractive indices and particle mixing states on shortwave radiative forcing (RF) of stratospheric aerosols in northern midlatitudes. In the absence of large volcanic sulfur emissions, our calculations show that organic components may have substantial impacts on stratospheric aerosol optical depth (AOD). Compared to pure sulfuric acid/water aerosol, organic-containing aerosols could cause +/- 100% change in shortwave RF (for low AOD conditions) depending on the refractive index and mixing state. The range found here of shortwave RF results, for different scenarios of organic complex refractive index and mixing state, call for better understandings of chemical and transport processes determining aerosol optical properties in the stratosphere.
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