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Long-path averaged mixing ratios of O3 and NO2 in the free troposphere from mountain MAX-DOAS
Título : Long-path averaged mixing ratios of O3 and NO2 in the free troposphere from mountain MAX-DOAS
Autor : Gómez Martín, L.; Navarro Comas, Mónica; Puentedura, Olga; González Ramos, Yenny; Cuevas Agulló, Emilio; Gil-Ojeda, Manuel
Palabras clave : Ozone; Gases traza; Alta troposfera; Free troposphere
Fecha de publicación : 2014
Editor: European Geosciences Union
Citación : Atmospheric Measurement Techniques. 2014, 7(10), p. 3373-3386
Versión del editor: https://dx.doi.org/10.5194/amt-7-3373-2014
Resumen : A new approximation is proposed to estimate O3 and NO2 mixing ratios in the northern subtropical free troposphere (FT). The proposed method uses O4 slant column densities (SCDs) at horizontal and near-zenith geometries to estimate a station-level differential path. The modified geometrical approach (MGA) is a simple method that takes advantage of a very long horizontal path to retrieve mixing ratios in the range of a few pptv. The methodology is presented, and the possible limitations are discussed. Multi-axis differential optical absorption spectroscopy (MAX-DOAS) high-mountain measurements recorded at the Izaña observatory (28° 18' N, 16° 29' W) are used in this study. The results show that under low aerosol loading, O3 and NO2 mixing ratios can be retrieved even at very low concentrations. The obtained mixing ratios are compared with those provided by in situ instrumentation at the observatory. The MGA reproduces the O3 mixing ratio measured by the in situ instrumentation with a difference of 28%. The different air masses scanned by each instrument are identified as a cause of the discrepancy between the O3 observed by MAX-DOAS and the in situ measurements. The NO2 is in the range of 20–40 ppt, which is below the detection limit of the in situ instrumentation, but it is in agreement with measurements from previous studies for similar conditions.
Patrocinador: We acknowledge the support of AMISOC (Atmospheric Minor Species relevant to the Ozone Chemistry at both sides of the Subtropical jet, contract number CGL2011-24891), and NORS (Demonstration Network of Ground-Based Remote Sensing Observations in support of the GMES Atmospheric Service) integrated project under the 7th Framework Programme (contract number FP7-SPACE-2011-284421).
URI : http://hdl.handle.net/20.500.11765/510
ISSN : 1867-1381
1867-8548
Colecciones: Artículos científicos 2010-2014


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