泰山大气卤代烃的长期变化趋势与来源

卤代烃是大气环境与气候变化研究的热点问题.基于2003～2018年在泰山山顶（36.25°N, 117.10°E,海拔1 534 m）的6期强化观测数据,结合气流轨迹模型与受体源解析模型,分析了华北平原区域背景大气中卤代烃的长期变化趋势和主要来源.结果表明,《蒙特利尔议定书》已淘汰物种（CFC-12、 CFC-11、 CFC-113、 H-1211、 CCl₄和CH₃CCl₃）体积分数显著下降,受管控物种（HCFC-22、 HCFC-141b、 HCFC-142b和HFC-134a）及未列入管控的物种（CH₂Cl₂、 C₂Cl₄、 CH₃Cl、 CHCl₃）体积分数则呈上升趋势且体积分数中位值显著高于北半球中纬度大气背景中位值;泰山卤代烃的体积分数主要受4种不同来向气团输送的影响,其中来自华北地区气团占比最高（41%）;主要来源包括生物质燃烧（38.1%）、制冷剂（26.2%）、工业及家用溶...

Long-term Trends and Sources of Atmospheric Halocarbons at Mount Taishan, Northern China

Halocarbons are hot topics in atmospheric environment and climate change research. Combining observational data from six field campaigns at the summit of Mount Taishan (36.25°N, 117.10°E, 1534 m above sea level) with backward trajectory and receptor source analyses, this study analyzed the long-term trends and major emission sources of halocarbons in the regional background atmosphere of the North China Plain (NCP) from 2003 to 2018. The results showed that the volume fraction of species eliminated by the Montreal Protocol (MP) showed a significant downward trend; however, the MP-controlled and unregulated species showed an overall upward trend. Meanwhile, the median volume fraction of the MP-controlled and unregulated species at Mount Taishan were significantly higher than the mid-latitude median background values in the northern hemisphere. Mount Taishan air was mainly affected by four types of air masses, of which the air mass originating from NCP accounted for the highest proportion (41%). The major sources of halocarbons were biomass/biofuel burning (38.1%), refrigeration (26.2%), industrial and domestic solvent use (21.7%), solvent use in the electronic industry (8.7%), and leakage of chlorofluorocarbon (CFCs) banks (5.3%). This study fully demonstrates that MP has been effectively implemented in China and provides evidence and recommendations to further reduce and control the volume fraction of halocarbons.