CIOP   05384
CENTRO DE INVESTIGACIONES OPTICAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Determination of the seasonal variation of the nitrogen dioxide and ozone vertical column density at Río Gallegos, Santa Cruz province, Argentina, using a zenith-sky DOAS system
Autor/es:
M. RAPONI, R. JIMÉNEZ, E. WOLFRAM, J. QUEL, J. TOCHO
Lugar:
La Paz
Reunión:
Workshop; 6 Workshop of Lidar Measureement in latin America; 2011
Resumen:
Stratospheric ozone (O3) plays a critical role in the atmosphere by absorbing most of the biologically damaging solar UV radiation before it reaches the Earth?s surface. Nitrogen dioxide (NO2) is a key trace gas in the ozone photochemical. The systematic sensing of NO2 and other minority gases is essential in order to understand the stratospheric O3 destruction and formation processes. We present the study carried out on the seasonal variation of the O3 and NO2 vertical column density (VCD), using a zenith-sky DOAS (Differential Optical Absorption Spectroscopy) systems composed by a spectral analyzer (portable spectrometer HR4000, Ocean Optics), two optical fibers (400 µm of core, 25 cm and 6 m of longitude), an automatic mechanical shutter. NO2 and O3 VCD are derived from solar spectra acquired during twilights (87° - 91° zenithal angles). The data retrieved using the DOAS technique are compared with those coming from the SAOZ spectrometer (Systeme d´Analyse par Observation Zenithale, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), France). Both instruments are located in Rio Gallegos, Santa Cruz province, Argentine (51° 36? S; 69° 19? W, 15 m asl), in the CEILAP-RG remote sensing station. We analyze the correlation between the O3 and NO2 VCD and compare the ground-based measurement with those coming from the OMI instrument (Ozone Monitoring Instrument, AURA satellite).