DOI: 10.1002/2013GL058780
论文题名: Tracking the Saharan Air Layer with shipborne lidar across the tropical Atlantic
作者: Kanitz T. ; Engelmann R. ; Heinold B. ; Baars H. ; Skupin A. ; Ansmann A.
刊名: Geophysical Research Letters
ISSN: 0094-10406
EISSN: 1944-10137
出版年: 2014
卷: 41, 期: 3 起始页码: 1044
结束页码: 1050
语种: 英语
英文关键词: COSMO-MUSCAT simulations of the vertical dust concentration
; shipborne lidar measurements above the Atlantic
; transatlantic transport of Saharan dust
Scopus关键词: Aerosol optical thickness
; Atmospheric residence time
; Backscatter coefficients
; Dust concentrations
; Extinction-to-backscatter ratio
; Lidar measurements
; Linear depolarization ratios
; Saharan dust
; Aerosols
; Atmospheric chemistry
; Backscattering
; Dust
; Residence time distribution
; Ships
; Optical radar
; aerosol
; backscatter
; data set
; dust
; lidar
; measurement method
; numerical model
; wavelength
; Atlantic Ocean
; Atlantic Ocean (Tropical)
; Sahara
英文摘要: Saharan dust was observed with shipborne lidar from 60° to 20°W along 14.5°N during a 1-month transatlantic cruise of the research vessel Meteor. About 4500 km off the coast of Africa, mean extinction and backscatter-related Ångström exponent of 0.1, wavelength-independent extinction-to-backscatter ratios (lidar ratios) of around 45 sr, and particle linear depolarization ratio of 20% were found for aged dust (transport time >10 days). In contrast, dust with a shorter atmospheric residence time of 2-3 days showed Ångström exponents of -0.5 (backscatter coefficient) and 0.1 (extinction coefficient), mean lidar ratios of 64 and 50 sr, and particle linear depolarization ratios of 22 and 26% at 355 and 532 nm wavelength, respectively. Traces of fire smoke were also detected in the observed dust layers. The lidar observations were complemented by Aerosol Robotic Network handheld Sun photometer measurements, which revealed a mean total atmospheric column aerosol optical thickness of 0.05 for pure marine conditions (in the absence of lofted aerosol layers) and roughly 0.9 during a strong Saharan dust outbreak. The achieved data set was compared with first Consortium for Small Scale Modeling-Multi-Scale Chemistry Aerosol Transport simulations. The simulated vertical aerosol distribution showed good agreement with the lidar observations. Key Points Shipborne lidar observations along the Saharan Air Layer from 60°W to 20°W Comparing shipborne lidar measurements and results from the model COSMO-MUSCAT Properties of the Saharan Air Layer after a travel distance of >10 and 2 days ©2014. The Authors.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84896744715&doi=10.1002%2f2013GL058780&partnerID=40&md5=e45f85083dc525ffa035fe83c7f9ac03
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7670
Appears in Collections: 气候减缓与适应
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作者单位: Leibniz Institute for Tropospheric Research, Leipzig, Germany
Recommended Citation:
Kanitz T.,Engelmann R.,Heinold B.,et al. Tracking the Saharan Air Layer with shipborne lidar across the tropical Atlantic[J]. Geophysical Research Letters,2014-01-01,41(3).