DOI: 10.1016/j.atmosenv.2017.07.036
Scopus记录号: 2-s2.0-85026404506
论文题名: Warming effect of dust aerosols modulated by overlapping clouds below
作者: Xu H ; , Guo J ; , Wang Y ; , Zhao C ; , Zhang Z ; , Min M ; , Miao Y ; , Liu H ; , He J ; , Zhou S ; , Zhai P
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 166 起始页码: 393
结束页码: 402
语种: 英语
英文关键词: Above-cloud dust aerosol
; CALIPSO
; Cloud
; Dust aerosol
; Radiative forcing
Scopus关键词: Atmospheric radiation
; Climate models
; Clouds
; Dust
; Oceanography
; Optical properties
; CALIPSO
; Cloud optical depth
; Direct radiative forcing
; Dust aerosols
; Radiative forcings
; Satellite measurements
; Top of atmospheres
; Visible wavelengths
; Aerosols
; aerosol
; CALIPSO
; cloud cover
; cooling
; dust
; optical depth
; radiative forcing
; satellite data
; shortwave radiation
; top of atmosphere
; warming
; aerosol
; air monitoring
; Article
; atmosphere
; cloud
; cooling
; direct radiative forcing
; dust
; environmental impact assessment
; fraction absorbed
; greenhouse effect
; measurement
; optical depth
; Pacific Ocean
; priority journal
; radiative forcing
; seasonal variation
; spring
; warming
; Pacific Ocean
; Pacific Ocean (North)
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Due to the substantial warming effect of dust aerosols overlying clouds and its poor representation in climate models, it is imperative to accurately quantify the direct radiative forcing (DRF) of above-cloud dust aerosols. When absorbing aerosol layers are located above clouds, the warming effect of aerosols strongly depends on the cloud macro- and micro-physical properties underneath, such as cloud optical depth and cloud fraction at visible wavelength. A larger aerosol-cloud overlap is believed to cause a larger warming effect of absorbing aerosols, but the influence of overlapping cloud fraction and cloud optical depth remains to be explored. In this study, the impact of overlapping cloud properties on the shortwave all-sky DRF due to springtime above-cloud dust aerosols is quantified over northern Pacific Ocean based on 10-year satellite measurements. On average, the DRF is roughly 0.62 Wm−2. Furthermore, the warming effect of dust aerosols linearly increases with both overlapping cloud fraction and cloud optical depth. An increase of 1% in overlapping cloud fraction will amplify this warming effect by 1.11 Wm−2τ−1. For the springtime northern Pacific Ocean, top-of-atmosphere cooling by dust aerosols turns into warming when overlapping cloud fraction is beyond 0.20. The variation of critical cloud optical depth beyond which dust aerosols switch from exerting a net cooling to a net warming effect depends on the concurrent overlapping cloud fraction. When the overlapping cloud coverage range increases from 0.2 to –0.4 to 0.6–0.8, the corresponding critical cloud optical depth reduces from 6.92 to 1.16. Our results demonstrate the importance of overlapping cloud properties for determining the springtime warming effect of dust aerosols. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82376
Appears in Collections: 气候变化事实与影响
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作者单位: State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States; College of Global Change and Earth System Science, Beijing Normal University, Beijing, China; Physics Department/JCET, University of Maryland, Baltimore County, MD, United States; National Satellite Meteorological Center, Chinese Meteorological Administration, Beijing, China; College of Atmospheric Science, Nanjing University of Information Sciences & Technology (NUIST), Nanjing, China
Recommended Citation:
Xu H,, Guo J,, Wang Y,et al. Warming effect of dust aerosols modulated by overlapping clouds below[J]. Atmospheric Environment,2017-01-01,166