Chemically-resolved aerosol eddy covariance flux measurements in urban Mexico City during MILAGRO 2006

Zalakeviciute, R.; Alexander, M.L.; Allwine, E.; Jimenez, J.L.; Jobson, B.T.; Molina, L.T.; Nemitz, E.; Pressley, S.N.; VanReken, T.; Ulbrich, I.M.; Velasco, E.; Lamb, B.K.. 2012 Chemically-resolved aerosol eddy covariance flux measurements in urban Mexico City during MILAGRO 2006. Atmospheric Chemistry and Physics Discussions, 12 (5). 11899-11939. 10.5194/acpd-12-11899-2012

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As part of the MILAGRO 2006 field campaign, the exchange of atmospheric aerosols with the urban landscape was measured from a tall tower erected in a heavily populated neighborhood of Mexico City. Urban submicron aerosol fluxes were measured using an eddy covariance method with a quadrupole aerosol mass spectrometer during a two week period in March 2006. Nitrate and ammonium aerosol concentrations were elevated at this location near the city center compared to measurements at other urban sites. Significant downward fluxes of nitrate aerosol, averaging −0.2 μg m−2 s−1, were measured during daytime. The urban surface was not a significant source of sulfate aerosols. The measurements also showed that primary organic aerosol fluxes, approximated by hydrocarbon-like organic aerosols (HOA), displayed diurnal patterns similar to CO2 fluxes and anthropogenic urban activities. Overall, 47% of submicron organic aerosol emissions were HOA, 35% were oxygenated (OOA) and 18% were associated with biomass burning (BBOA). Organic aerosol fluxes were bi-directional, but on average HOA fluxes were 0.09 μg m−2 s−1, OOA fluxes were −0.002 μg m−2 s−1, and BBOA fluxes were −0.03 μg m−2 s−1. The average diurnal flux results showed that the 2006 gridded emissions inventory of Mexico City underestimates mid-day and evening rush hour emissions of submicron aerosols for the monitored neighborhood, but averaged daily, the emission inventory and flux measurements for this location were in close agreement.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.5194/acpd-12-11899-2012
Programmes: CEH Topics & Objectives 2009 - 2012 > Biogeochemistry > BGC Topic 1 - Monitoring and Interpretation of Biogeochemical and Climate Changes > BGC - 1.1 - Monitor concentrations, fluxes, physico-chemical forms of current and emerging pollutants ...
CEH Sections: Billett (to November 2013)
ISSN: 1680-7367
Additional Information. Not used in RCUK Gateway to Research.: Open Access article - click on Official URL link for full text
NORA Subject Terms: Atmospheric Sciences
Date made live: 07 Aug 2012 14:20

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