DOI: 10.1175/JCLI-D-17-0406.1
Scopus记录号: 2-s2.0-85047075177
论文题名: Low cloud cover sensitivity to biomass-burning aerosols and meteorology over the Southeast Atlantic
作者: Adebiyi A.A. ; Zuidema P.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 11 起始页码: 4329
结束页码: 4346
语种: 英语
英文关键词: Aerosol-cloud interaction
; Aerosols
; Cloud cover
; Large-scale motions
; Synoptic-scale processes
Scopus关键词: Aerosols
; Atmospheric aerosols
; Clouds
; Linear regression
; Moisture
; Subsidence
; Troposphere
; Aerosol optical depths
; Aerosol-cloud interaction
; Cloud cover
; Geo-potential heights
; Large scale motion
; Meteorological parameters
; Multiple linear regressions
; Synoptic-scale process
; Meteorology
英文摘要: Shortwave-absorbing aerosols seasonally cover and interact with an expansive low-level cloud deck over the southeast Atlantic. Daily anomalies of the MODIS low cloud fraction, fine-mode aerosol optical depth (AODf), and six ERA-Interim meteorological parameters (lower-tropospheric stability, 800-hPa subsidence, 600-hPa specific humidity, 1000- and 800-hPa horizontal temperature advection, and 1000-hPa geopotential height) are constructed spanning July-October (2001-12). A standardized multiple linear regression, whereby the change in the low cloud fraction to each component's variability is normalized by one standard deviation, facilitates comparison between the different variables. Most cloud-meteorology relationships follow expected behavior for stratocumulus clouds. Of interest is the low cloud-subsidence relationship, whereby increasing subsidence increases low cloud cover between 10° and 20°S but decreases it elsewhere. Increases in AODf increase cloudiness everywhere, independent of other meteorological predictors. The cloud-AODf effect is partially compensated by accompanying increases in the midtropospheric moisture, which is associated with decreases in low cloud cover. This suggests that the free-tropospheric moisture affects the low cloud deck primarily through longwave radiation rather than mixing. The low cloud cover is also more sensitive to aerosol when the vertical distance between the cloud and aerosol layer is relatively small, which is more likely to occur early in the biomass burning season and farther offshore. A parallel statistical analysis that does not include AODf finds altered relationships between the low cloud cover changes and meteorology that can be understood through the aerosol cross-correlations with the meteorological predictors. For example, the low cloud-stability relationship appears stronger if aerosols are not explicitly included. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111502
Appears in Collections: 气候减缓与适应
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作者单位: Rosenstiel School of Marine and Atmospheric Sciences, University of Miami, Miami, FL, United States
Recommended Citation:
Adebiyi A.A.,Zuidema P.. Low cloud cover sensitivity to biomass-burning aerosols and meteorology over the Southeast Atlantic[J]. Journal of Climate,2018-01-01,31(11)