Characteristics and Source Apportionment of Black Carbon Over the Eastern Tibetan Plateau

• Published in: Huanjing kexue Vol. 44; no. 5; p. 2450
• Main Authors: Wang, Hong-Lei, Liu, Si-Han, Zhao, Tian-Liang, Lu, Wen, Xia, Jun-Rong, Shi, Shuang-Shuang
• Format: Journal Article
• Language: Chinese
• Published: China 08.05.2023
• Subjects: Tibetan Plateau; black carbon(BC); potential affecting area; potential source apportionment; diurnal variation
• ISSN: 0250-3301
• DOI: 10.13227/j.hjkx.202206036

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 (BC) in Litang ranged from 0.4 to 4699.8 ng·m , with an average value of 816.4 ng·m , accounting for 5.96% of PM . The average mass concentrations of (BC ) and (BC ) in Litang were 486.1 ng·m and 398.5 ng·m , respectively, with a of 0.51. The (BC) mass concentration was mainly distributed from 0-2000 ng·m , which accounted for 92.5% of the total observation period. The diurnal variation in BC, BC , and BC showed a bimodal distrib