Origins of black carbon from anthropogenic emissions and open biomass burning transported to Xishuangbanna, Southwest China  

作　　者：Xuyan Liu SiwenWang Qianqian Zhang Chunlai Jiang Linlin Liang Shihao Tang Xingying Zhang Xiuzhen Han Lin Zhu 

机构地区：[1]National Satellite Meteorological Center,Beijing 100081,China [2]State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex,Beijing 100084,China [3]Department of Multiphase Chemistry,Max Planck Institute for Chemistry,Mainz 55128,Germany [4]Research Center for Total Pollution Load Control and Emission Trading,Chinese Academy of Environmental Planning,Beijing 100012,China [5]State Key Laboratory of Severe Weather and Key Laboratory for Atmospheric Chemistry,Chinese Academy of Meteorological Sciences,Beijing 100081,China

出　　处：《Journal of Environmental Sciences》2023年第3期277-289,共13页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 41705109 and 41805098);State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex (No. SCAPC_(2)02001);State Key Laboratory of Severe Weather & Key Laboratory for Atmospheric Chemistry (No. 2018B04);Tsinghua National Laboratory for Information Science and Technology。

摘　　要：Black carbon(BC) has importance regarding aerosol composition, radiative balance, and human exposure. This study adopted a backward-trajectory approach to quantify the origins of BC from anthropogenic emissions(BCAn) and open biomass burning(BCBB) transported to Xishuangbanna in 2017. Haze months, between haze and clean months, and clean months in Xishuangbanna were defined according to daily PM_(2.5)concentrations of >75, 35–75, and<35 μg/m^(3), respectively. Results showed that the transport efficiency density(TED) of BC transported to Xishuangbanna was controlled by the prevailing winds in different seasons.The yearly contributions to the effective emission intensity of BCAnand BCBBtransported to Xishuangbanna were 52% and 48%, respectively. However, when haze occurred in Xishuangbanna, the average BCAnand BCBBcontributions were 23% and 77%, respectively. This suggests that open biomass burning(BB) becomes the dominant source in haze months. Myanmar, India, and Laos were the dominant source regions of BC transported to Xishuangbanna during haze months, accounting for 59%, 18%, and 13% of the total, respectively. Furthermore, India was identified as the most important source regions of BCAntransported to Xishuangbanna in haze months, accounting for 14%. The two countries making the greatest contributions to BCBBtransported to Xishuangbanna were Myanmar and Laos in haze months, accounting for 55% and 13%, respectively. BC emissions from Xishuangbanna had minimal effects on the results of the present study. It is suggested that open BB in Myanmar and Laos, and anthropogenic emissions in India were responsible for poor air quality in Xishuangbanna.

关 键 词：Black carbon XISHUANGBANNA Effective emission intensity Anthropogenic emissions Open biomass burning 

分 类 号：X513[环境科学与工程—环境工程]