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dc.contributor.authorMueller, D.
dc.contributor.authorFranke, K
dc.contributor.authorWagner, F
dc.contributor.authorAlthausen, D
dc.contributor.authorAnsmann, A
dc.contributor.authorHeintzenberg, J
dc.contributor.authorVerver, G
dc.date.accessioned2017-04-19T13:01:59Z
dc.date.available2017-04-19T13:01:59Z
dc.date.issued2001-11-27
dc.identifier.citationMueller , D , Franke , K , Wagner , F , Althausen , D , Ansmann , A , Heintzenberg , J & Verver , G 2001 , ' Vertical profiling of optical and physical particle properties over the tropical Indian Ocean with six-wavelength lidar 2. Case studies ' , Journal of Geophysical Research: Atmospheres , vol. 106 , no. D22 , pp. 28577-28595 . https://doi.org/10.1029/2000JD900785
dc.identifier.issn2169-897X
dc.identifier.otherPURE: 1982468
dc.identifier.otherPURE UUID: 260c7945-1e9c-4a25-9655-f7dec5d399bd
dc.identifier.otherWOS: 000172355800040
dc.identifier.otherScopus: 0035682466
dc.identifier.urihttp://hdl.handle.net/2299/17962
dc.descriptionDetlef Muller, Kathleenn Franke, Frank Wagner, Dietrich Althausen, Albert Ansmann, Jost Heintzenberg, and Ge Verver, 'Vertical profiling of optical and physical particle properties over the tropical Indian Ocean with six-wavelength lidar: 2. Case studies', Journal of Geophysical Research: Atmospheres, Vol. 106 (D22): 28577-28595, first published online 1 November 2001, doi: 10.1029/2000JD900785. Copyright 2001 by the American Geophysical Union.
dc.description.abstractWe present the seasonal cycle of optical and physical particle properties over the Indian Ocean based on case studies of six-wavelength aerosol lidar observations performed in the framework of the Indian Ocean Experiment. From February 1999 to March 2000 the lidar system made routine measurements at the International Airport of the Maldives on Hulule island (4.1 degreesN, 73.3 degreesE). The measurement from February 18, 1999, during the northeast monsoon showed high optical depths of 0.27 at 532 mn. Lidar ratios of 40-45 sr at 532 nm indicated the long-range transport of well-aged polluted air from Southeast Asia. Effective radii of 1.6-0.01i, and single-scattering albedos of 0.86-0.93 at 532 nm were retrieved for the pollution layer above 1000 m height. Similar physical particle properties followed from the measurement on March 22, 2000. Optical depths were 0.4; lidar ratios of 60 sr at 1000 m height indicated anthropogenic pollution from India. Values of 45 sr at 3000 m height indicated a considerable influence by clean-continental particles from Africa and Arabia. Accordingly, the single-scattering albedo ranged from 0.85-0.9. During the southwest monsoon in July, air was advected from the western Indian Ocean, eastern Africa, and Arabia. Particles were transported into maximum heights of 5 km from these regions on July 12, 1999. Small effective radii of 0.18-0.3 mum, considerably lower mean complex refractive indices of 0.88 indicated the prevailing clean-marine and clean-continental conditions. The intermonsoon season was characterized by strong washout processes during the crossover of the Intertropical Convergence Zone. On October 16, 1999, low optical depths of 0.13 and lidar ratios from 20-35 sr indicated clean-marine conditions. Accordingly, large effective radii of 0.2-0.35 mum, low complex refractive indices similar to1.45-0.005i, and single-scattering albedos >0.95 were found.en
dc.format.extent19
dc.language.isoeng
dc.relation.ispartofJournal of Geophysical Research: Atmospheres
dc.subjectRADIATIVE PROPERTIES
dc.subjectINDUSTRIAL ACTIVITIES
dc.subjectELASTIC-BACKSCATTER LIDAR
dc.subjectFUEL COMBUSTION
dc.subjectCOMPLEX INDEX
dc.subjectATMOSPHERIC AEROSOLS
dc.subjectLONG-RANGE TRANSPORT
dc.subjectCHEMICAL CHARACTERIZATION
dc.subject6-WAVELENGTH LIDAR
dc.subjectARABIAN SEA
dc.titleVertical profiling of optical and physical particle properties over the tropical Indian Ocean with six-wavelength lidar 2. Case studiesen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Atmospheric and Climate Physics Research
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dcterms.dateAccepted2001-11-27
rioxxterms.versionofrecordhttps://doi.org/10.1029/2000JD900785
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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