DOI: 10.1002/jgrd.50273
论文题名: North-south cross sections of the vertical aerosol distribution over the Atlantic Ocean from multiwavelength Raman/polarization lidar during Polarstern cruises
作者: Kanitz T. ; Ansmann A. ; Engelmann R. ; Althausen D.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 6 起始页码: 2643
结束页码: 2655
语种: 英语
Scopus关键词: Boundary layers
; Dust
; Optical properties
; Optical radar
; Ships
; Troposphere
; Aerosol distribution
; Aerosol optical thickness
; Extinction coefficients
; Marine boundary layers
; Northern Hemispheres
; Particle optical properties
; Saharan dust plumes
; Southern Hemisphere
; Aerosols
; aerosol property
; atmospheric plume
; atmospheric pollution
; benthic boundary layer
; data set
; dust
; extinction coefficient
; lidar
; marine atmosphere
; optical depth
; Raman spectroscopy
; research vessel
; Southern Hemisphere
; troposphere
; vertical profile
; Atlantic Ocean
; Chile
; Magallanes
; Punta Arenas
; South Africa
; Stellenbosch
; Western Cape
英文摘要: [1] Shipborne aerosol lidar observations were performed aboard the research vessel Polarstern in 2009 and 2010 during three north-south cruises from about 50.N to 50.S. The aerosol data set provides an excellent opportunity to characterize and contrast the vertical aerosol distribution over the Atlantic Ocean in the polluted northern and relatively clean southern hemisphere. Three case studies, an observed pure Saharan dust plume, a Patagonian dust plume east of South America, and a case of a mixed dust/smoke plume west of Central Africa are exemplarily shown and discussed by means of their optical properties. The meridional transatlantic cruises were used to determine the latitudinal cross section of the aerosol optical thickness (AOT). Profiles of particle backscatter and extinction coefficients are presented as mean profiles for latitudinal belts to contrast northern- and southern-hemispheric aerosol loads and optical effects. Results of lidar observations at Punta Arenas (53.S), Chile, and Stellenbosch (34.S), South Africa, are shown and confirm the lower frequency of occurrence of free-tropospheric aerosol in the southern hemisphere than in the northern hemisphere. The maximum latitudinal mean AOT of 0.27 was found in the northern tropics (0.15.N) in the Saharan outflow region. Marine AOT is typically 0.05 . 0.03. Particle optical properties are presented separately for the marine boundary layer and the free troposphere. Concerning the contrast between the anthropogenically influenced midlatitudinal aerosol conditions in the 30.60.N belt and the respective belt in the southern hemisphere over the remote Atlantic, it is found that the AOT and extinction coefficients for the vertical column from 0.5 km (total aerosol column) and 1.5 km height (lofted aerosol above the marine boundary layer) are a factor of 1.6 and 2 higher at northern midlatitudes than at respective southern midlatitudes, and a factor of 2.5 higher than at the clean marine southern-hemispheric site of Punta Arenas. The strong contrast is confined to the lowermost 3 km of the atmosphere. © 2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63857
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Leibniz Institute for Tropospheric Research, Permoserstr. 15, 04318 Leipzig, Germany
Recommended Citation:
Kanitz T.,Ansmann A.,Engelmann R.,et al. North-south cross sections of the vertical aerosol distribution over the Atlantic Ocean from multiwavelength Raman/polarization lidar during Polarstern cruises[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(6)