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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 25 — Sep. 1, 2007
  • pp: 6302–6308

Particle backscatter, extinction, and lidar ratio profiling with Raman lidar in south and north China

Matthias Tesche, Albert Ansmann, Detlef Müller, Dietrich Althausen, Ronny Engelmann, Min Hu, and Yuanghang Zhang  »View Author Affiliations


Applied Optics, Vol. 46, Issue 25, pp. 6302-6308 (2007)
http://dx.doi.org/10.1364/AO.46.006302


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Abstract

Aerosol Raman lidar observations of profiles of the particle extinction and backscatter coefficients and the respective extinction-to-backscatter ratio (lidar ratio) were performed under highly polluted conditions in the Pearl River Delta (PRD) in southern China in October 2004 and at Beijing during a clear period with moderately polluted to background aerosol conditions in January 2005. The anthropogenic haze in the PRD is characterized by volume light-extinction coefficients of particles ranging from approximately 200 to 800 Mm 1 and lidar ratios mostly between 40 and 55 sr (average of 47 ± 6   sr ). Almost clean air masses were observed throughout the measurements of the Beijing campaign. These air masses originated from arid desert–steppe-like regions (greater Gobi area). Extinction values usually varied between 100 and 300 Mm 1 , and the lidar ratios were considerably lower (compared with PRD values) with values mostly from 30 to 45 sr (average of 38 ± 7   sr ). Gobi dust partly influenced the observations. Unexpectedly low lidar ratios of approximately 25 sr were found for a case of background aerosol with a low optical depth of 0.05. The low lidar ratios are consistent with Mie-scattering calculations applied to ground-based observations of particle size distributions.

© 2007 Optical Society of America

OCIS Codes
(010.0010) Atmospheric and oceanic optics : Atmospheric and oceanic optics
(010.3640) Atmospheric and oceanic optics : Lidar
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(280.0280) Remote sensing and sensors : Remote sensing and sensors
(280.3640) Remote sensing and sensors : Lidar

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: February 22, 2007
Revised Manuscript: May 16, 2007
Manuscript Accepted: May 28, 2007
Published: August 23, 2007

Citation
Matthias Tesche, Albert Ansmann, Detlef Müller, Dietrich Althausen, Ronny Engelmann, Min Hu, and Yuanghang Zhang, "Particle backscatter, extinction, and lidar ratio profiling with Raman lidar in south and north China," Appl. Opt. 46, 6302-6308 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-25-6302

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