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Proceedings Paper

Atmospheric transport of smoke and dust particulates and their interaction with the Planetary Boundary Layer as observed by multi-wavelength lidar and supporting instrumentation
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Paper Abstract

In this paper, we present results showing the usefulness of multi-wavelength lidar measurements to study the interaction of aerosols in the PBL with long range advected aerosol plumes. In particular, our measurements are used to determine the plume angstrom exponent, which allows us to differentiate smoke events from dust events, as well as partitioning the total aerosol optical depth obtained from a CIMEL sky radiometer between the PBL and the high altitude plumes. Furthermore, we show that only if the optical depth from the upper level plumes is taken into account, the correlation between the lidar derived PBL aerosol optical depth and surface PM2.5 is high. In addition, we also observe the dynamic interaction of high altitude plumes interacting with the PBL, resulting in a dramatic rise in surface PM10 concentrations without a corresponding dramatic rise in PM2.5 concentrations. These observations strongly suggest the deposition of large particulates into the PBL which is consistent with both lidar angstrom coefficient measurements and back-trajectory analysis. Finally, we investigate the correspondence between surface PM2.5 concentrations and optical backscatter coefficients as a function of altitude. To perform this study, our lidar system is replaced by a ceilometer (Vaisala CL-31) which can determine backscatter to near surface level. In particular, we confirm that near surface backscatter within the first 100 meters is a good proxy for PM2.5 but as altitude increases beyond 500 meters, the correlations degrades dramatically. These studies are useful in identifying the vertical length scales in which spaced based lidars such as Calipso can be used to probe surface PM2.5.

Paper Details

Date Published: 26 September 2007
PDF: 11 pages
Proc. SPIE 6681, Lidar Remote Sensing for Environmental Monitoring VIII, 66810K (26 September 2007); doi: 10.1117/12.731943
Show Author Affiliations
Leona Charles, Optical Remote Sensing Lab. (United States)
CUNY Graduate Ctr. (United States)
Barry Gross, Optical Remote Sensing Lab. (United States)
Yonghua Wu, Optical Remote Sensing Lab. (United States)
Viviana Vladutescu, Optical Remote Sensing Lab. (United States)
CUNY Graduate Ctr. (United States)
Fred Moshary, Optical Remote Sensing Lab. (United States)
Sam Ahmed, Optical Remote Sensing Lab. (United States)

Published in SPIE Proceedings Vol. 6681:
Lidar Remote Sensing for Environmental Monitoring VIII
Upendra N. Singh, Editor(s)

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