ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-8-7619-2008 Aircraft and ground-based measurements of hydroperoxides during the 2006 MILAGRO field campaign Nunnermacker L. J. 1 Weinstein-Lloyd J. B. 2 Hillery B. 2 Giebel B. 3 Kleinman L. I. 1 Springston S. R. 1 Daum P. H. 1 Gaffney J. 4 Marley N. 4 Huey G. 5 Brookhaven National Laboratory Atmospheric Sciences Division Upton, NY 11973, USA Chemistry/Physics Department State, University of New York, Old Westbury, NY, USA Rosenstiel School of Marine and Atmospheric Science, Division of Marine and Atmospheric Chemistry, University of Miami, Miami, FL, USA University of Arkansas, Department of Chemistry, Little Rock, AR, USA Georgia Institute of Technology School of Earth and Atmospheric Sciences, Atlanta, GA, USA 18 12 2008 8 24 7619 7636 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/8/7619/2008/acp-8-7619-2008.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/8/7619/2008/acp-8-7619-2008.pdf

Mixing ratios of hydrogen peroxide and hydroxymethyl hydroperoxide were determined aboard the US Department of Energy G-1 Research Aircraft during the March, 2006 MILAGRO field campaign in Mexico. Ground measurements of total hydroperoxide were made at Tecámac University, about 35 km NW of Mexico City. In the air and on the ground, peroxide mixing ratios near the source region were generally near 1 ppbv. Strong southerly flow resulted in transport of pollutants from Mexico City to two downwind surface sites on several flight days. On these days, it was observed that peroxide concentrations slightly decreased as the G-1 flew progressively downwind. This observation is consistent with low or negative net peroxide production rates calculated for the source region and is due to the very high NO<sub>x</sub> concentrations in the Mexico City plateau. However, relatively high values of peroxide were observed at takeoff and landing near Veracruz, a site with much higher humidity and lower NO<sub>x</sub> concentrations.

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