HR: 1400h
AN: A33A-13    [Abstracts]
TI: Trace gas measurements at the Altzomoni site (4000 masl) near Mexico City
AU: * Grutter, M
EM: grutter@servidor.unam.mx
AF: Centro de Ciencias de la Atmosfera, Universidad Nacional Autonoma de Mexico (UNAM), Mexico, DF 04510, Mexico
AU: Basaldud, R
AF: Centro de Ciencias de la Atmosfera, Universidad Nacional Autonoma de Mexico (UNAM), Mexico, DF 04510, Mexico
AU: Hernandez, A
AF: Centro de Ciencias de la Atmosfera, Universidad Nacional Autonoma de Mexico (UNAM), Mexico, DF 04510, Mexico
AU: Baumgardnrer, D
AF: Centro de Ciencias de la Atmosfera, Universidad Nacional Autonoma de Mexico (UNAM), Mexico, DF 04510, Mexico
AU: Rappenglueck, B
AF: Deptartment of Geoscience, University of Houston, Houston, TX 77204, United States
AU: Steinbrecher, R
AF: Institute of Meteorology and Climate Research, Atmospheric Environmental Division, Forschungszentrum Karlsruhe, Garmisch-Partenkirch, 82467, Germany
AU: Retama, A
AF: Secretari­a de Medio Ambiente, Gobierno del Distrito Federal, Mexico, DF 11800, Mexico
AB: The Altzomoni site is located on a mountain pass 60 km southeast of Mexico City and more than 1700 m above the basin. This high altitude station is well above the boundary layer and thus gives the possibility to observe long range transport of pollutants primarily between the Puebla and the MCMA basins. Situated inside the Izta-Popo National Park, with close to 20000 hectares, the site has no significant anthropogenic emissions. Trace gas measurements were done using an open-path FTIR spectrometer during November 2005 and March of 2006. The bistatic telescope system was placed on top of two hills separated by 367 m. Spectra in the region 600 - 4000 cm-1 were averaged and recorded at 0.5 cm-1 spectral resolution every 5 min and the concentrations of CO, CO2, CH4, N2O, O3, HCHO and other trace gases were retrieved using an NL-CLS algorithm. Comparisons with point samplers were made during the November campaign. Afternoon peaks and high correlations of co-located PAN, PPN and VOC measurements indicate a growth of the boundary layer enough to submerge over the observation site and thus giving place to pollution transport in the regional scale. The evolution of the mixing layer height was also followed with a LIDAR system located downhill 22 km west of Altzomoni.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Joint Assembly