Compensational methods for retrieving ozone concentration profiles with a multiwavelength DIAL system

Conference · Sun Jan 01 04:00:00 EST 1995

OSTI ID:263842

Kovalev, V A; Bristow, M P; Mcelroy, J L; Alvarez, II, R J

Uncertainty in the spectral dependencies of atmospheric aerosol backscattering and extinction produces an uncertainty in the corresponding correction terms in the DIAL (differential absorption lidar) equation used to determine O3 concentration values, especially in turbid atmospheres where large aerosol backscattering gradients exist. Two ways exist for reducing the systematic distortion in ozone concentration profiles caused by aerosol differential extinction and backscattering, viz. (1) to correct the calculated O3 profile using assumed atmospheric spectral dependencies for extinction (total scattering) and backscattering (the conventional correction method), or (2) to reduce this distortion using new methods for processing an extended DIAL signal set measured simultaneously at a number of wavelengths (the compensational method). The second approach, which is the subject of this study, involves the use of a multiwavelength technique that is analogous to the total ozone measurement mode with a Dobson sun photometer. In the latter approach, the influence of aerosol differential scattering is rendered negligible by making measurements at two overlapping pairs of on and off wavelengths. Two versions of this technique are presented involving either four or three DIAL wavelength sets.

• Research Organization: Optical Society of America, Washington, DC (United States)
• OSTI ID: 263842
• Report Number(s): LC--95-67220; LC--95-67219; NIPS--96-08630; CONF-950277--
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ABSORPTION SPECTROSCOPY
AEROSOLS
EARTH ATMOSPHERE
ECOLOGICAL CONCENTRATION
OPTICAL RADAR
OZONE
REMOTE SENSING