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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 15 — Jul. 20, 2009
  • pp: 12944–12959

Monitoring of atmospheric ozone and nitrogen dioxide over the south of Portugal by ground-based and satellite observations

Daniele Bortoli, Ana Maria Silva, Maria João Costa, Ana Filipa Domingues, and Giorgio Giovanelli  »View Author Affiliations


Optics Express, Vol. 17, Issue 15, pp. 12944-12959 (2009)
http://dx.doi.org/10.1364/OE.17.012944


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Abstract

The SPATRAM (Spectrometer for Atmospheric TRAcers Monitoring) instrument has been developed as a result of the collaboration between CGE-UE, ISAC-CNR and Italian National Agency for New Technologies, Energy and the Environment (ENEA). SPATRAM is a multi-purpose UV-Vis-scanning spectrometer (250 – 950 nm) and it is installed at the Observatory of the CGE, in Evora, since April 2004. A brief description of the instrument is given, highlighting the technological innovations with respect to the previous version of similar equipment. The need for such measurements automatically taken on a routine basis in south-western European regions, specifically in Portugal, has encouraged the development and installation of the equipment and constitutes a major driving force for the present work. The main features and some improvements introduced in the DOAS (Differential Optical Absorption Spectroscopy) algorithms are discussed. The results obtained applying DOAS methodology to the SPATRAM spectrometer measurements of diffused spectral sky radiation are presented in terms of diurnal and seasonal variations of nitrogen dioxide (NO2) and ozone (O3). NO2 confirms the typical seasonal cycle reaching the maximum of (6.5 ± 0.3) × 10+15 molecules cm−2 for the sunset values (PM), during the summer season, and the minimum of (1.55 ± 0.07) × 10+15 molecules cm−2 for the sunrise values (AM) in winter. O3 presents the maximum total column of (433 ± 5) Dobson Unit (DU) in the spring season and the minimum of (284 ± 3) DU during the fall period. The huge daily variations of the O3 total column during the spring season are analyzed and discussed. The ground-based results obtained for NO2 and O3 column contents are compared with data from satellite-borne equipment (GOME - Global Ozone Monitoring Experiment; SCIAMACHY - Scanning Imaging Absorption Spectrometer for Atmospheric CHartographY; TOMS - Total Ozone Monitoring Spectrometer) and it is shown that the two data sets are in good agreement. The correlation coefficient for the comparison of the ground-based/satellite data for O3 is of 0.97.

© 2009 OSA

OCIS Codes
(010.1280) Atmospheric and oceanic optics : Atmospheric composition
(010.4950) Atmospheric and oceanic optics : Ozone
(280.0280) Remote sensing and sensors : Remote sensing and sensors
(300.6190) Spectroscopy : Spectrometers

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: April 2, 2009
Revised Manuscript: June 7, 2009
Manuscript Accepted: June 9, 2009
Published: July 20, 2009

Citation
Daniele Bortoli, Ana Maria Silva, Maria João Costa, Ana Filipa Domingues, and Giorgio Giovanelli, "Monitoring of atmospheric ozone and nitrogen dioxide over the south of Portugal by ground-based and satellite observations," Opt. Express 17, 12944-12959 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-15-12944


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