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Temporal and Spatial Variations of Atmospheric Radiocarbon in the Mexico City Metropolitan Area

Published online by Cambridge University Press:  09 February 2016

Laura Beramendi-Orosco ,
Galia Gonzalez-Hernandez ,
Adriana Martinez-Jurado ,
Angeles Martinez-Reyes ,
Alfonso Garcia-Samano ,
Jose Villanueva-Diaz ,
Francisco Javier Santos-Arevalo ,
Isabel Gomez-Martinez  and
Omar Amador-Muñoz
Laura Beramendi-Orosco*
Affiliation:
Instituto de Geologia, Universidad Nacional Autonoma de Mexico, Ciudad Universitaria, 04510, Mexico
Galia Gonzalez-Hernandez
Affiliation:
Instituto de Geofisica, Universidad Nacional Autonoma de Mexico, Ciudad Universitaria, 04510, Mexico
Adriana Martinez-Jurado
Affiliation:
Posgrado en Ciencias Biológicas, Universidad Nacional Autonoma de Mexico, Ciudad Universitaria, 04510, Mexico
Angeles Martinez-Reyes
Affiliation:
Posgrado en Ciencias Biológicas, Universidad Nacional Autonoma de Mexico, Ciudad Universitaria, 04510, Mexico
Alfonso Garcia-Samano
Affiliation:
Facultad de Ciencias, Universidad Nacional Autonoma de Mexico, Ciudad Universitaria, 04510, Mexico
Jose Villanueva-Diaz
Affiliation:
Laboratorio Nacional de Dendrocronologia, Instituto Nacional de Investigaciones Forestales Agricolas y Pecuarias, Gomez Palacio, Durango, Apdo Postal 41, Mexico
Francisco Javier Santos-Arevalo
Affiliation:
Centro Nacional de Aceleradores (CNA), Avda. Thomas Alva Edison 7, Isla de la Cartuja, Seville 41092, Spain
Isabel Gomez-Martinez
Affiliation:
Centro Nacional de Aceleradores (CNA), Avda. Thomas Alva Edison 7, Isla de la Cartuja, Seville 41092, Spain
Omar Amador-Muñoz
Affiliation:
Centro de Ciencias de la Atmosfera, Universidad Nacional Autonoma de Mexico, Ciudad Universitaria, 04510, Mexico
*
Corresponding author. Email: laurab@geologia.unam.mx.
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Abstract

The Mexico City Metropolitan Area (MCMA) produces a complex mixture of gases and aerosols from diverse sources, including burning of fossil fuels, biomass, and wastes, with a significant biogenic contribution. We present the first results of ongoing projects to study temporal and spatial variations of 14CO2 in the area. Temporal variations reconstructed from tree rings of Taxodium mucronatum indicate a considerable radiocarbon depletion, in accordance to the vast amount of fossil fuels burnt inside Mexico Valley, with values between 62 and 246‰ lower than background values for the 1962–1968 period, and lower by 51–88‰ for the 1983–2010 period. The lower dilution found for the last decades might indicate an increase in enriched 14CO2 sources. Results from the spatial distribution, as revealed from integrated CO2 samples and grasses from six points within the MCMA collected during the 2013 dry season, show variations between sites and sample types. For integrated CO2 samples, values range from 35.6‰ to 54.0‰, and for grasses between −86.8‰ and 40.7‰. For three of the sampling points, the grasses are significantly depleted, by up to ∼133‰, as compared to the corresponding integrated CO2 sample. This may result from differences in the carbon assimilation period and exposure to different CO2 sources. Higher-than-background Δ14C values were found for all integrated CO2 samples, presumably resulting from 14C-enriched CO2 derived from forest fires in the mountains during the sampling period. Results obtained so far confirm the complexity of the 14C cycle in the MCMA.

Type
Articles
Information
Radiocarbon , Volume 57 , Issue 3 , 2015 , pp. 363 - 375
Copyright
Copyright © 2015 by the Arizona Board of Regents on behalf of the University of Arizona 

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