| 青藏高原东缘黑碳气溶胶变化特征及其来源 |
| 摘要点击 2851 全文点击 2582 投稿时间：2022-06-04 修订日期：2022-07-02 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 青藏高原 黑碳(BC) 日变化 潜在来源 影响区域 |
| 英文关键词 Tibetan Plateau black carbon(BC) diurnal variation potential source apportionment potential affecting area |
|
| 中文摘要 |
| 黑碳（BC）作为最重要的吸收性气溶胶，可影响青藏高原地区的辐射、云和地表积雪等，进而影响全球季风环流及降水.本研究于2017年7月5日至9月5日在青藏高原东缘理塘县使用黑碳仪AE-33测量了BC浓度数据，结合黑碳仪模型、PSCF和CWT潜在来源模型，分析了BC的污染特征、潜在来源及其影响区域.结果表明，理塘ρ（BC）为0.4~4699.8 ng ·m-3，平均值为816.4ng ·m-3，占PM2.5的质量分数为5.96%.理塘ρ（BC液态燃料）和ρ（BC固态燃料）的平均值分别为486.1ng ·m-3和398.5ng ·m-3，BC液态燃料的贡献率C为0.51.ρ（BC）主要分布在0~2000 ng ·m-3，可占总观测期间的92.5%.BC、BC液态燃料和BC固态燃料的日变化为双峰型分布，峰值分别出现在08：00和20：00，早高峰主要与交通源和含碳物质不完全燃烧有关，而在晚高峰期间则主要受到含碳物质不完全燃烧影响.PM2.5和BC的潜在来源和影响范围不同.境外输入对理塘PM2.5和BC的浓度影响较大，其影响范围主要集中在我国境内，向其东北部传输，高值中心主要集中在理塘周边地区. |
| 英文摘要 |
| As the most important absorbing aerosol, black carbon (BC) can affect radiation, clouds, and surface snow cover over the Tibetan Plateau. In this study, the BC mass concentrations were measured using a seven-channel aethalometer (AE-33) in Litang County over the eastern Tibetan Plateau from July 5 to September 5, 2017. The aethalometer model, potential source contribution function (PSCF), and concentration-weighted trajectory (CWT) models were used to analyze the variation characteristics, potential sources, and affecting areas of BC. The results showed that the mass concentration of ρ(BC) in Litang ranged from 0.4 to 4699.8 ng·m-3, with an average value of 816.4 ng·m-3, accounting for 5.96% of PM2.5. The average mass concentrations of ρ(BCliquid) and ρ(BCsolid) in Litang were 486.1 ng·m-3 and 398.5 ng·m-3, respectively, with a C of 0.51. The ρ(BC) mass concentration was mainly distributed from 0-2000 ng·m-3, which accounted for 92.5% of the total observation period. The diurnal variation in BC, BCliquid, and BCsolid showed a bimodal distribution, with the peaks appearing at 08:00 and 20:00, respectively. The first peak was mainly related to traffic sources and incomplete combustion of carbonaceous materials, whereas the second peak was mainly related to incomplete combustion of carbonaceous materials. The potential sources and affecting areas of PM2.5 and BC were different. Imports from abroad had a greater impact on the concentrations of PM2.5 and BC in Litang, and the affecting areas were mainly transmitted to the northeast in China. The high-value centers were mainly concentrated in the surrounding areas of Litang. |
|
|
|
