Spatio-temporal variations of black carbon concentrations in the Megacity Beijing
Spatio-temporal variations of black carbon concentrations in the Megacity Beijing
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DOI：
10.1016/j.envpol.2013.07.042
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发表时间：
2013-11-01
影响因子：
8.9
通讯作者：
Cen, Kuang
中科院分区：
文献类型：
--
作者：
Schleicher, Nina;Norra, Stefan;Cen, Kuang
为研究北京市大气中黑碳浓度的时空分布和通量，在北京市5个采样点进行了为期2年的连续观测。结果表明：北京市大气污染具有明显的时空变异性。冬季的浓度最高，这主要是由于停滞的气象条件和季节性的BC来源，例如用于取暖的燃煤。生物质燃烧被确定为夏季月份的一个次要季节性来源。由于交通和工业等不同的本地BC源的排放强度不同，BC在空间上也存在差异，北京东南部的浓度较高，西北部的浓度较低。通常，由于特定的气象条件，如较低的城市混合层高度和各种人为活动，如市区内专用的夜间重型车辆交通，夜间BC浓度较高。(C)2013爱思唯尔有限公司保留所有权利。
The spatial and temporal distribution and the flux of black carbon (BC) concentration in Beijing were continuously investigated over a two-year period at five sites to highlight the relative influence of contributing sources. The results demonstrate firstly that there is significant spatio-temporal variability of BC in Beijing. Highest concentrations occurred during winter primarily due to stagnant meteorological conditions, and seasonal BC sources, such as coal combustion for heating purposes. Biomass burning was identified as a minor seasonal source during the summer months. BC also varied spatially with higher concentrations in the SE of Beijing and lower concentrations in the NW, due to the differing emission intensity of various local BC sources such as traffic and industry. Frequently, overnight BC concentrations were higher due to specific meteorological conditions, such as the lower urban mixing layer height and various anthropogenic activities, such as exclusive night-time heavy duty vehicle traffic in the inner-city. (C) 2013 Elsevier Ltd. All rights reserved.