DOI: 10.1002/2014GL060897
论文题名: Identification of a new dust-stratocumulus indirect effect over the tropical North Atlantic
作者: Doherty O.M. ; Evan A.T.
刊名: Geophysical Research Letters
ISSN: 0094-9736
EISSN: 1944-9467
出版年: 2014
卷: 41, 期: 19 起始页码: 6935
结束页码: 6942
语种: 英语
英文关键词: CAM
; indirect effect
; ISSCP
; mineral dust
; PATMOSx
; stratocumulus
Scopus关键词: Aerosols
; Atmospheric boundary layer
; Atmospheric radiation
; Cams
; Climatology
; Clouds
; Minerals
; Tropics
; Indirect effects
; ISSCP
; Mineral dust
; PATMOSx
; stratocumulus
; Dust
; boundary layer
; cloud microphysics
; cloud radiative forcing
; cooling
; dust
; estimation method
; stratocumulus
; Atlantic Ocean
; Atlantic Ocean (North)
英文摘要: Over the tropical North Atlantic, during boreal summer, both stratocumulus clouds and mineral aerosols are ubiquitous. We find that low cloud fraction increases in response to high mineral aerosols loadings by 3% to 10% over much of the tropical North Atlantic, in International Satellite Cloud Climatology Project (ISSCP) and Pathfinder Atmosphere Extended (PATMOSx) observations. Using the single-column mode of the Community Earth System Model (CESM), we estimate that this indirect effect nets a surface cooling of approximately -3 Wm-2 to -12 Wm-2 per unit of dust optical depth (DAOD) increase in mineral aerosols, similar to observed radiative forcings of -4 Wm-2 to -6 Wm-2 per unit of DAOD in ISSCP and PATMOSx. Increases in stratocumulus clouds are linked to increases in atmospheric stability, reductions in boundary layer height, and moistening of the lower atmosphere in response to increased dust load. Mineral dust is shown to behave similarly to other absorbing aerosols in indirectly forcing a response in stratocumulus clouds. Key Points Dust increases low cloud fraction in observation and GCMCalculated radiative forcing of low cloud responseLow cloud increase due to stability, PBL height, and moisture ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911072079&doi=10.1002%2f2014GL060897&partnerID=40&md5=4e16de9bd02890e975c2572d9296f332
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7000
Appears in Collections: 气候减缓与适应
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作者单位: Scripps Institution of Oceanography, University of California, San Diego, San Diego, CA, United States
Recommended Citation:
Doherty O.M.,Evan A.T.. Identification of a new dust-stratocumulus indirect effect over the tropical North Atlantic[J]. Geophysical Research Letters,2014-01-01,41(19).