<?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%">Sun, X. S.</style></author><author><style face="normal" font="default" size="100%">Hu, M.</style></author><author><style face="normal" font="default" size="100%">Guo, S.</style></author><author><style face="normal" font="default" size="100%">Liu, K. X.</style></author><author><style face="normal" font="default" size="100%">Zhou, L. P.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">C-14-Based source assessment of carbonaceous aerosols at a rural site</style></title><secondary-title><style face="normal" font="default" size="100%">Atmospheric EnvironmentAtmospheric Environment</style></secondary-title><alt-title><style face="normal" font="default" size="100%">Atmos Environ</style></alt-title><short-title><style face="normal" font="default" size="100%">Atmos. Environ.</style></short-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">ambient aerosol</style></keyword><keyword><style  face="normal" font="default" size="100%">anthropogenic emission</style></keyword><keyword><style  face="normal" font="default" size="100%">atmospheric aerosols</style></keyword><keyword><style  face="normal" font="default" size="100%">Carbonaceous aerosols</style></keyword><keyword><style  face="normal" font="default" size="100%">China</style></keyword><keyword><style  face="normal" font="default" size="100%">elemental carbon</style></keyword><keyword><style  face="normal" font="default" size="100%">fine particles</style></keyword><keyword><style  face="normal" font="default" size="100%">fossil sources</style></keyword><keyword><style  face="normal" font="default" size="100%">organic-compounds</style></keyword><keyword><style  face="normal" font="default" size="100%">pm2.5</style></keyword><keyword><style  face="normal" font="default" size="100%">radiocarbon</style></keyword><keyword><style  face="normal" font="default" size="100%">radiocarbon analysis</style></keyword><keyword><style  face="normal" font="default" size="100%">source apportionment</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2012</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%">50</style></volume><pages><style face="normal" font="default" size="100%">36-40</style></pages><isbn><style face="normal" font="default" size="100%">1352-2310</style></isbn><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">Radiocarbon (C-14) has become a powerful tracer in source apportionments of atmospheric carbonaceous particles. Fine particles (PM2.5) were collected at a rural site of Beijing in the summer and winter of 2007. The fractions of contemporary carbon (f(C)) in total carbon (TC) and elemental carbon (EC) are presented using C-14 measurements. This value directly represents the contemporary biogenic contribution, since recently living biomass and biogenic organic compound emissions have f(C) = 1, whereas anthropogenic emissions from fossil carbon have f(C) = 0 because the C-14 in the latter has completely decayed. The measured f(C) (TC) values range from 0.30 to 0.38 (n = 12) in winter and 0.31 to 0.44 (n = 12) in summer, respectively. The levels of f(C) values are lower than those from other rural sites in the world, indicating that the Yufa site was heavily influenced by anthropogenic emissions. The high TC concentrations in winter with the lower average f(C) (TC) suggest that coal burning for residential heating was significant contributors to the TC concentrations. The sources of contemporary carbon are primary emissions due to biomass burning, and biogenic secondary organic aerosol. Biomass burning was a dominant contributor in the winter. Fossil fuels represented 80-87% of EC in both seasons. (C) 2012 Elsevier Ltd. All rights reserved.</style></abstract><accession-num><style face="normal" font="default" size="100%">WOS:000301561100005</style></accession-num><notes><style face="normal" font="default" size="100%">909JPTimes Cited:4Cited References Count:39</style></notes><auth-address><style face="normal" font="default" size="100%">Hu, MPeking Univ, State Key Joint Lab Environm Simulat &amp; Pollut Con, Coll Environm Sci &amp; Engn, Beijing 100871, Peoples R ChinaPeking Univ, State Key Joint Lab Environm Simulat &amp; Pollut Con, Coll Environm Sci &amp; Engn, Beijing 100871, Peoples R ChinaPeking Univ, State Key Joint Lab Environm Simulat &amp; Pollut Con, Coll Environm Sci &amp; Engn, Beijing 100871, Peoples R ChinaPeking Univ, State Key Lab Nucl Phys &amp; Technol, Beijing 100871, Peoples R ChinaPeking Univ, Inst Heavy Ion Phys, Sch Phys, Beijing 100871, Peoples R ChinaPeking Univ, Lab Earth Surface Proc, Dept Geog, Beijing 100871, Peoples R China</style></auth-address></record></records></xml>