CIOP   05384
CENTRO DE INVESTIGACIONES OPTICAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Remote sensing of stratospheric O3 and NO2 using a portable and compact DOAS spectrometer
Autor/es:
MARCELO M. RAPONI, RODRIGO JIMÉNEZ, E WOLAFRAM, EDUARDO J. QUEL.; TOCHO, J. O.
Lugar:
Lima
Reunión:
Congreso; VII Iberoamerican Conference on Optics (RIAO) and X Latinoamerican Meeting on Optics, Lasers and Applications (OPTILAS); 2010
Institución organizadora:
Pontificia Universidad Católica del Perú
Resumen:
The
use of passive and active remote sensing systems has largely contributed to
advance our understanding of important atmospheric phenomena. We present the
design and development of a compact and portable passive DOAS system, to
measure the vertical column density (VCD) of multiple atmospheric trace gases.
We highlight the main characteristics of the systems components: a
mini-spectrometer (HR4000, Ocean Optics), an optical fiber (400 µm of core, 6 m
and 25 cm of longitude), an external shutter and the control/ processing
software. The NO2 and O3 VCD are derived from solar
spectra acquired during twilights (87°- 91° zenithal angles) using the DOAS
(Differential Optical Absorption Spectroscopy) technique. The analysis is
carried out by solving the Beer-Lambert (BL) law for the main atmospheric
absorbers in the selected wavelength ranges. The algorithm minimizes the
fitting residuals to the BL law, having as unknown the slant column density
(SCD) of the species to determine. We present measurements carried out at the
Marambio Antarctic Base (64° 14 25 S; 56° 37 21 W, 197 m asl) during
January - February 2008. In addition, we compare our results with co-located
measurements performed with EVA, a visible absorption spectrometer of Instituto
Nacional de Técnica Aeroespacial (INTA, Spain), a Dobson spectrophotometer
(SMN) and the OMI instrument (AURA satellite).