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dc.contributor.authorFranke, K.
dc.contributor.authorAnsmann, A.
dc.contributor.authorMueller, D.
dc.contributor.authorAlthausen, D.
dc.contributor.authorWagner, F.
dc.contributor.authorScheele, R.
dc.date.accessioned2014-01-16T12:30:31Z
dc.date.available2014-01-16T12:30:31Z
dc.date.issued2001-12-15
dc.identifier.citationFranke , K , Ansmann , A , Mueller , D , Althausen , D , Wagner , F & Scheele , R 2001 , ' One-year observations of particle lidar ratio over the tropical Indian Ocean with Raman lidar ' , Geophysical Research Letters , vol. 28 , no. 24 , pp. 4559-4562 . https://doi.org/10.1029/2001GL013671
dc.identifier.issn0094-8276
dc.identifier.otherPURE: 1982363
dc.identifier.otherPURE UUID: 31c87a42-6e90-40e0-b741-657a59045649
dc.identifier.otherWOS: 000173025400013
dc.identifier.otherScopus: 0035894840
dc.identifier.urihttp://hdl.handle.net/2299/12563
dc.description.abstractObservations of the extinction-to-backscatter ratio (lidar ratio) of South and Southeast Asian aerosol particles are presented for the wavelength of 532 nm. Raman lidar measurements were performed in the Maldives (4.1 degrees N, 73.3 degrees E) in the framework of the Indian Ocean Experiment (INDOEX) in 1999/2000. These observations in the tropics axe an important contribution to a growing global lidar-ratio climatology which is needed for an improved determination of the particle optical depth with ground-based and spaceborne lidars. The lidar ratio was found to be a useful quantity to trace back different pollution sources and to identify less and considerably light-absorbing particles. During the winter/spring seasons heavily polluted air from India and Southeast Asia was advected to the lidar site. Under these conditions lidar ratios up to 110 sr were observed in the lofted pollution plumes above 1000 m height. According to backward trajectories the highest lidar ratios were found for airmasses which crossed the eastern and northeastern parts of India. Large lidar ratios > 70 sr indicate small, considerably absorbing aerosol particles. Below 1000 in height, the lidar ratio typically ranged from 30-60 sr. The marine boundary layer contained a mixture of marine and anthropogenic particles. Under clean, marine conditions in October 1999, lidar ratios <30 sr were found.en
dc.format.extent4
dc.language.isoeng
dc.relation.ispartofGeophysical Research Letters
dc.subjectTO-BACKSCATTER RATIO
dc.subjectTROPOSPHERIC AEROSOL
dc.titleOne-year observations of particle lidar ratio over the tropical Indian Ocean with Raman lidaren
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.dateAccepted2001-12-15
rioxxterms.versionofrecordhttps://doi.org/10.1029/2001GL013671
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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