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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 35, Iss. 24 — Aug. 20, 1996
  • pp: 4812–4819

Lidar aerosol backscatter cross sections in the 2-μm near-infrared wavelength region

Sury Chudamani, James D. Spinhirne, and Antony D. Clarke  »View Author Affiliations


Applied Optics, Vol. 35, Issue 24, pp. 4812-4819 (1996)
http://dx.doi.org/10.1364/AO.35.004812


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Abstract

Lidar backscatter cross-sectional measurements at 1.064, 0.532, and 1.54 μm were acquired during November 1989 and May–June 1990 around the Pacific region by the NASA DC-8 aircraft as part of the Global Backscatter Experiment. The primary motivation for the Global Backscatter Experiment was the study of lidar backscatter cross sections for the development of a spaceborne wind-sensing lidar. Direct backscatter measurements obtained by the NASA Goddard Space Flight Center visible and infrared lidar are compared with backscatter cross sections calculated from aerosol size distributions obtained by particle counters. Results for one flight with pronounced aerosol layers in the upper troposphere southeast of Japan are presented. Because 2-μm region wavelengths are possible candidates for a spaceborne wind-sensing lidar, the visible and infrared lidar backscatter cross sections at 1.064, 0.532, and 1.54 μm are extrapolated to the 2-μm region. The extrapolated 2-μm cross sections are compared with lidar measurements at 9 μm. A significant range in the ratio of 2–9-μm backscatter cross sections is found, but a large number of points concentrate near ratios of three to ten. A large number of 1.064- and 1.54-μm cross sections were binned to provide an estimate of backscatter for various percentiles for the flight. The ratio of the 50-percentile backscatter values at 1.064 and 1.54 μm suggest a λ−1.9 to λ−3.0 wavelength dependence of aerosol backscatter cross section in the near infrared for the observational case.

© 1996 Optical Society of America

History
Original Manuscript: July 13, 1995
Revised Manuscript: March 13, 1996
Published: August 20, 1996

Citation
Sury Chudamani, James D. Spinhirne, and Antony D. Clarke, "Lidar aerosol backscatter cross sections in the 2-μm near-infrared wavelength region," Appl. Opt. 35, 4812-4819 (1996)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-35-24-4812


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