Nitrogen dioxide DOAS measurements from ground and space: comparison ofzenith scattered sunlight ground-based measurements and OMI data in Central Mexico
The use of satellite data in com bination with ground-based measurements can provide valuable information about atmospheric chemistry and air quality. In this study, ground-based Differential Optical Absorption Spectroscopy (DOAS) measurements of nitrogen dioxide (N02) conducted in central Mexico ar...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2013 |
| País: | México |
| Institución: | Universidad Nacional Autónoma de México |
| Repositorio: | Redalyc-UNAM |
| OAI Identifier: | oai:redalyc.org:56527859009 |
| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=56527859009 |
| Access Level: | acceso abierto |
| Palabra clave: | Ciencias de la Tierra OMI DOAS based space borne |
| Sumario: | The use of satellite data in com bination with ground-based measurements can provide valuable information about atmospheric chemistry and air quality. In this study, ground-based Differential Optical Absorption Spectroscopy (DOAS) measurements of nitrogen dioxide (N02) conducted in central Mexico are compared with the space-bome Ozone Monitoring Instrument (OMI) dataset of 2006-2011. Ground-based measure- ments exhibited large day-to-day variations and were on average three times higher than the space-borne derived average over the observation site. This difference is attributed to strong horizontal inhomogeneity of the lower layer of the measured N0 2 colurnns, sampled over a large footprint from the satellite instrument. Also, a reduced sensitivity of the satellite observation near the surface, where the largest concentrations are expected, could be responsible for this large discrepancy. From the analyzed OMI dataset, distribution maps ofN0 2 above central Mexico were reconstructed, allowing to identify three main areas with increased N0 2 colurnn densities: The dominating metropolitan area ofMexico City, the heavily industrialized region ofTula lo the norlhand the Cuemavaca valleylo the south, In this analysis, seasonal variability ofN0 2 columns over central Mexico was detecled, finding higher N0 2 columns during the dry andcold season, followed by the dry and wann period, and finally the lowesl N0 2 columns werefound during lhe rainy season, Pollutiontransporl of this gas from TulainloMexico City, as well aslowardsthe Cuemavaca valley, is evidenl from this datase. |
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