<?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%">X. Li</style></author><author><style face="normal" font="default" size="100%">Rohrer, F.</style></author><author><style face="normal" font="default" size="100%">Brauers, T.</style></author><author><style face="normal" font="default" size="100%">Hofzumahaus, A.</style></author><author><style face="normal" font="default" size="100%">Lu, K.</style></author><author><style face="normal" font="default" size="100%">Shao, M.</style></author><author><style face="normal" font="default" size="100%">Zhang, Y. H.</style></author><author><style face="normal" font="default" size="100%">Wahner, A.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Modeling of HCHO and CHOCHO at a semi-rural site in southern China during the PRIDE-PRD2006 campaign</style></title><secondary-title><style face="normal" font="default" size="100%">Atmospheric Chemistry and PhysicsAtmospheric Chemistry and PhysicsAtmospheric Chemistry and Physics</style></secondary-title><alt-title><style face="normal" font="default" size="100%">Atmos Chem Phys</style></alt-title><short-title><style face="normal" font="default" size="100%">Atmos Chem PhysAtmos Chem Phys</style></short-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">aerosol</style></keyword><keyword><style  face="normal" font="default" size="100%">air-pollution sources</style></keyword><keyword><style  face="normal" font="default" size="100%">formaldehyde measurements</style></keyword><keyword><style  face="normal" font="default" size="100%">global-scale</style></keyword><keyword><style  face="normal" font="default" size="100%">glyoxal</style></keyword><keyword><style  face="normal" font="default" size="100%">max-doas measurements</style></keyword><keyword><style  face="normal" font="default" size="100%">organic-compounds</style></keyword><keyword><style  face="normal" font="default" size="100%">pearl river delta</style></keyword><keyword><style  face="normal" font="default" size="100%">rural site</style></keyword><keyword><style  face="normal" font="default" size="100%">secondary sources</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2014</style></year></dates><number><style face="normal" font="default" size="100%">22</style></number><volume><style face="normal" font="default" size="100%">14</style></volume><pages><style face="normal" font="default" size="100%">12291-12305</style></pages><isbn><style face="normal" font="default" size="100%">1680-7316</style></isbn><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">HCHO and CHOCHO are important trace gases in the atmosphere, serving as tracers of VOC oxidations. In the past decade, high concentrations of HCHO and CHOCHO have been observed for the Pearl River Delta (PRD) region in southern China. In this study, we performed box model simulations of HCHO and CHOCHO at a semi-rural site in the PRD, focusing on understanding their sources and sinks and factors influencing the CHOCHO to HCHO ratio (R-GF). The model was constrained by the simultaneous measurements of trace gases and radicals. Isoprene oxidation by OH radicals is the major pathway forming HCHO, followed by degradations of alkenes, aromatics, and alkanes. The production of CHOCHO is dominated by isoprene and aromatic degradation; contributions from other NMHCs are of minor importance. Compared to the measurement results, the model predicts significant higher HCHO and CHOCHO concentrations. Sensitivity studies suggest that fresh emissions of precursor VOCs, uptake of HCHO and CHOCHO by aerosols, fast vertical transport, and uncertainties in the treatment of dry deposition all have the potential to contribute significantly to this discrepancy. Our study indicates that, in addition to chemical considerations (i.e., VOC composition, OH and NOx levels), atmospheric physical processes (e.g., transport, dilution, deposition) make it difficult to use the CHOCHO to HCHO ratio as an indicator for the origin of air mass composition.</style></abstract><accession-num><style face="normal" font="default" size="100%">WOS:000345290700019</style></accession-num><notes><style face="normal" font="default" size="100%">Au0clTimes Cited:0Cited References Count:47</style></notes><auth-address><style face="normal" font="default" size="100%">Li, XForschungszentrum Julich, Inst Energie &amp; Klimaforsch Troposphare IEK 8, D-52425 Julich, GermanyForschungszentrum Julich, Inst Energie &amp; Klimaforsch Troposphare IEK 8, D-52425 Julich, GermanyForschungszentrum Julich, Inst Energie &amp; Klimaforsch Troposphare IEK 8, D-52425 Julich, GermanyPeking Univ, Coll Environm Sci &amp; Engn, Beijing 100871, Peoples R China</style></auth-address></record></records></xml>