DOI: 10.1029/2019JD030967
论文题名: Direct Radiative Effect of Absorbing Aerosols: Sensitivity to Mixing State, Brown Carbon, and Soil Dust Refractive Index and Shape
作者: Tuccella P. ; Curci G. ; Pitari G. ; Lee S. ; Jo D.S.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2020
卷: 125, 期: 2 语种: 英语
英文关键词: black carbon
; brown carbon
; direct radiative effect
; mixing state
; radiation-absorbing aerosols
; soil dust
Scopus关键词: absorption
; AERONET
; aerosol composition
; biomass burning
; black carbon
; brown carbon
; eolian deposit
; mixing
; particle size
; radiation balance
英文摘要: Black carbon (BC), brown carbon (BrC), and soil dust are the most relevant radiation-absorbing aerosols in the climate system, and uncertainties of their absorbing optical properties are large. We performed a 5-year simulation with the GEOS-Chem global chemistry and transport model and calculated the aerosol optical properties testing different mixing state assumptions and absorption properties of BC and BrC, refractive index, and shape of soil dust. We found that the core-shell (CS) internal mixing representation produces the most accurate absorption aerosol optical depth and single-scattering albedo at Aerosol Robotic Network (AERONET) Sun photometers site observations dominated by carbonaceous absorption. Dust absorption is sensitive to the assumed refractive index. The nonspherical shape of dust improves the simulation at sites dominated by dust absorption. Global mean of all-sky direct radiative effect (DRE) by BC is +0.13 and +0.25 W/m2 for external and CS mixing state assumptions, respectively. Adding BrC in CS mixing state, the BC-BrC DRE mixture increases to +0.40 W/m2, indicating an absorption enhancement with respect to external mixing state of +0.27 W/m2, which is less than the +0.51 W/m2 previously reported. The difference is attributed to the inclusion of the blanching process of BrC from biomass burning. Dust DREs are −0.10, +0.11, and +0.22 W/m2 for “low,” “middle,” and “high” dust absorption scenarios, respectively. Considering the nonspherical shape, these values change by up to 0.03 W/m2. All-sky DRE by all radiation-absorbing aerosols is +0.46 W/m2. Aerosol mixing state, BrC treatment, and dust optical property uncertainties suggest a total DRE uncertainty of −57%/+59%. ©2020. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160016
Appears in Collections: 气候变化与战略
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作者单位: Department of Physical and Chemical Sciences, University of L'Aquila, L'Aquila, Italy; Center of Excellence in Telesensing of Environment and Model Prediction of Severe Events, University of L'Aquila, L'Aquila, Italy; School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea; Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, United States; Department of Chemistry, University of Colorado Boulder, Boulder, CO, United States
Recommended Citation:
Tuccella P.,Curci G.,Pitari G.,et al. Direct Radiative Effect of Absorbing Aerosols: Sensitivity to Mixing State, Brown Carbon, and Soil Dust Refractive Index and Shape[J]. Journal of Geophysical Research: Atmospheres,2020-01-01,125(2)