 |
| Titel |
Impact of external industrial sources on the regional and local air quality of Mexico Megacity |
| VerfasserIn |
Victor Almanza, Luisa T. Molina, Guohui Li, Jerome Fast, Gustavo Sosa |
| Konferenz |
EGU General Assembly 2014
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250099433
|
| Publikation (Nr.) |
 EGU/EGU2014-15212.pdf |
|
|
|
|
|
| Zusammenfassung |
| The air quality of megacities can be influenced by external emissions sources on both
regional and global scales. At the same time their outflow emissions can exert an important
impact to the surrounding environment. The present study evaluates an SO2 peak observed on
24 March 2006 at the suburban supersite and ambient air quality monitoring stations
located in the northern region of the Mexico City Metropolitan Area (MCMA) during
MILAGRO campaign. We found that this peak could be related to an important
episodic emission event coming from Tizayuca region, northeast of the MCMA. Back
trajectories analyses suggest that the emission event started in the early morning at 04:00
LST and lasted for about 9 hours. The estimated emission rate is high, about 2
kg s-1. This finding suggests the possibility of “overlooked” emission sources in
Tizayuca region that could influence the air quality of the MCMA. This further
motivated us to study the cement plants, including those in the State of Hidalgo and
the State of Mexico. We found that they can also contribute SO2 in the NE region
of the basin, at the suburban supersite and that at some monitoring stations; their
contribution can be even higher than from the Tula Industrial Complex (TIC). The
contribution of TIC to regional ozone levels is also estimated. The model suggests low
contribution to the MCMA and slightly higher contribution at the suburban and
rural supersites. However, the contribution could be high in the upper northwest
region of the basin and in the southwest and south-southeast regions of the State
of Hidalgo. In addition, a first estimate of the potential contribution from flaring
activities to regional ozone levels is presented. Results suggest that part of the total
regional ozone from TIC-generated precursors could be related to flaring activities. |
|
|
|
|
|
|