Impact of long-range transport and under-cloud scavenging on precipitation chemistry in East China

摘要: Two hundred twenty-five precipitation samples were collected at high- (summit, 1,534 m ASL) and low-elevation (base, 218 m sites between 2005 2008 in eastern China. The present work focused on the roles of long-range transport under-cloud/boundary layer scavenging chemical composition two sites. Ionic trace species analyzed 225 samples. A total 72 events occurring simultaneously summit base further examined. Positive matrix factorization (PMF) backward air mass trajectories used to identify sources pollutants. Low pH high concentrations ionic measured both Inter-correlations for simultaneous poor elements (−0.07~0.47). several fold increase major ion (122~546%) element (261~3,302%) occurred as rain fell. Approximately 89% masses responsible distance origin. Marine salt, crustal material, fossil fuel burning plus secondary products, metallic-industry-related factors identified by PMF, contributing 9.7%, 22.8%, 41.8%, 25.6%, respectively, pollutants 13.3%, 31.9%, 39.6%, 15.2%, base. Long-range atmospheric primarily influenced low site was strongly under-cloud process local boundary Crustal material products predominant pollution this region.