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Proceedings Paper

Ozone and aerosol distribution above Mexico City measured with a DIAL/elastic lidar system during the Mexico City Metropolitan Area (MCMA) 2003 field campaign
Author(s): Valentin Simeonov; Pablo Ristori; Marian Taslakov; Todor Dinoev; Luisa T. Molina; Mario J. Molina; Hubert van den Bergh
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Paper Abstract

Ozone and aerosol vertical distribution and their time evolution were measured with a combined UV DIAL / 532-nm elastic lidar during the MCMA 2003 field campaign held in April-May 2003 in Mexico City Metropolitan Area (MCMA). The DIAL transmitter is based on a N2 Raman converter, pumped by the IVth harmonic of a Nd:YAG laser. The residual second harmonic radiation from the laser is used for aerosol measurements. In the DIAL part of the receiver a dual-telescope configuration ("Long" and "Short" range) is employed to reduce the dynamic range of the signals and a single 20 cm F/4 Newtonian type telescope is used for the aerosol observations at 532 nm. The DIAL wavelengths are transmitted coaxially to the long range telescope and the 532 nm beam is transmitted coaxially to the "aerosol" telescope. The DIAL receiver is equipped with a grating polychromator for spectral separation and the 532 nm receiver uses a narrowband (0.4 nm) interference filter. "Hamamatsu" 5783-06 photosensor modules detect all signals. Ozone concentration was measured to altitudes of up to 6 km AGL and aerosol to 14 km AGL. The height of the PBL was estimated from the aerosol measurements. The diurnal evolution of the PBL and ozone were studied during the campaign. Formation of a residual layer containing elevated ozone concentrations at nighttime, as well as detachment of the PBL in the late afternoon hours were observed.

Paper Details

Date Published: 1 November 2005
PDF: 8 pages
Proc. SPIE 5984, Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing, 59840O (1 November 2005); doi: 10.1117/12.629429
Show Author Affiliations
Valentin Simeonov, Swiss Federal Institute of Technology (Switzerland)
Pablo Ristori, Swiss Federal Institute of Technology (Switzerland)
Marian Taslakov, Swiss Federal Institute of Technology (Switzerland)
Todor Dinoev, Swiss Federal Institute of Technology (Switzerland)
Luisa T. Molina, Massachusetts Institute of Technology (United States)
Mario J. Molina, Massachusetts Institute of Technology (United States)
Hubert van den Bergh, Swiss Federal Institute of Technology (Switzerland)


Published in SPIE Proceedings Vol. 5984:
Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing
Upendra N. Singh, Editor(s)

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