<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Heald, C. L.</style></author><author><style face="normal" font="default" size="100%">Kroll, J. H.</style></author><author><style face="normal" font="default" size="100%">Jimenez, J. L.</style></author><author><style face="normal" font="default" size="100%">Docherty, K. S.</style></author><author><style face="normal" font="default" size="100%">DeCarlo, P. F.</style></author><author><style face="normal" font="default" size="100%">Aiken, A. C.</style></author><author><style face="normal" font="default" size="100%">Q. Chen</style></author><author><style face="normal" font="default" size="100%">Martin, S. T.</style></author><author><style face="normal" font="default" size="100%">Farmer, D. K.</style></author><author><style face="normal" font="default" size="100%">Artaxo, P.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">A simplified description of the evolution of organic aerosol composition in the atmosphere</style></title><secondary-title><style face="normal" font="default" size="100%">Geophysical Research Letters</style></secondary-title><alt-title><style face="normal" font="default" size="100%">Geophys. Res. Lett.</style></alt-title><short-title><style face="normal" font="default" size="100%">Geophys. Res. Lett.Geophys. Res. Lett.</style></short-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">campaign</style></keyword><keyword><style  face="normal" font="default" size="100%">chemistry</style></keyword><keyword><style  face="normal" font="default" size="100%">high-resolution</style></keyword><keyword><style  face="normal" font="default" size="100%">mass-spectrometry</style></keyword><keyword><style  face="normal" font="default" size="100%">mexico-city</style></keyword><keyword><style  face="normal" font="default" size="100%">secondary</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2010</style></year><pub-dates><date><style  face="normal" font="default" size="100%">Apr</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">37</style></volume><pages><style face="normal" font="default" size="100%">L08803</style></pages><isbn><style face="normal" font="default" size="100%">0094-8276</style></isbn><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">Organic aerosol (OA) in the atmosphere consists of a multitude of organic species which are either directly emitted or the products of a variety of chemical reactions. This complexity challenges our ability to explicitly characterize the chemical composition of these particles. We find that the bulk composition of OA from a variety of environments (laboratory and field) occupies a narrow range in the space of a Van Krevelen diagram (H: C versus O:C), characterized by a slope of similar to-1. The data show that atmospheric aging, involving processes such as volatilization, oxidation, mixing of air masses or condensation of further products, is consistent with movement along this line, producing a more oxidized aerosol. This finding has implications for our understanding of the evolution of atmospheric OA and representation of these processes in models. Citation: Heald, C. L., J. H. Kroll, J. L. Jimenez, K. S. Docherty, P. F. DeCarlo, A. C. Aiken, Q. Chen, S. T. Martin, D. K. Farmer, and P. Artaxo (2010), A simplified description of the evolution of organic aerosol composition in the atmosphere, Geophys. Res. Lett., 37, L08803, doi: 10.1029/2010GL042737.</style></abstract><work-type><style face="normal" font="default" size="100%">Article</style></work-type><accession-num><style face="normal" font="default" size="100%">ISI:000277033000004</style></accession-num><notes><style face="normal" font="default" size="100%">&lt;p&gt;ISI Document Delivery No.: 587YPTimes Cited: 0Cited Reference Count: 27Heald, C. L. Kroll, J. H. Jimenez, J. L. Docherty, K. S. DeCarlo, P. F. Aiken, A. C. Chen, Q. Martin, S. T. Farmer, D. K. Artaxo, P.Nsf [atm-0929282, atm-0449815, atm-0723582]; noaa [na08oar4310565]Authors C. L. Heald and J. H. Kroll contributed equally to this work. This work was supported in part by NSF grants ATM-0929282, ATM-0449815, and ATM-0723582 and NOAA grant NA08OAR4310565. We thank A. J. Weinheimer (NCAR) for providing the MILAGRO NOx/NOy observations.Amer geophysical unionWashington&lt;/p&gt;</style></notes><auth-address><style face="normal" font="default" size="100%">[Heald, C. L.] Colorado State Univ, Dept Atmospher Sci, Ft Collins, CO 80525 USA. [Chen, Q.; Martin, S. T.] Harvard Univ, Sch Engn &amp;amp; Appl Sci, Cambridge, MA 02138 USA. [Chen, Q.; Martin, S. T.] Harvard Univ, Dept Earth &amp;amp; Planetary Sci, Cambridge, MA 02138 USA. [Kroll, J. H.] MIT, Dept Civil &amp;amp; Environm Engn, Cambridge, MA 02139 USA. [Jimenez, J. L.; Docherty, K. S.; Aiken, A. C.; Farmer, D. K.] Univ Colorado, CIRES, Boulder, CO 80309 USA. [Jimenez, J. L.; Docherty, K. S.; Aiken, A. C.; Farmer, D. K.] Univ Colorado, Dept Chem &amp;amp; Biochem, Boulder, CO 80309 USA. [DeCarlo, P. F.] Univ Colorado, Dept Atmospher &amp;amp; Ocean Sci, Boulder, CO 80309 USA. [DeCarlo, P. F.] Univ Colorado, CIRES, Boulder, CO 80309 USA. [Artaxo, P.] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, Brazil.Heald, CL, Colorado State Univ, Dept Atmospher Sci, 1371 Campus Delivery, Ft Collins, CO 80525 USA.heald@atmos.colosate.edu</style></auth-address></record></records></xml>