Institute of Mineralogy and Geochemistry, Karlsruhe Institute of Technology, Adenauerring 20b, 76131 Karlsruhe, Germany.
Environ Pollut. 2013 Nov;182:392-401. doi: 10.1016/j.envpol.2013.07.042. Epub 2013 Aug 24.
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.
在北京的五个地点进行了为期两年的连续调查，以研究黑碳（BC）浓度的时空分布和通量，突出了贡献源的相对影响。结果表明，北京的 BC 存在显著的时空变异性。浓度最高出现在冬季，主要是由于气象条件停滞不前，以及冬季燃煤取暖等季节性 BC 源。夏季，生物质燃烧被确定为一个次要的季节性源。BC 也具有空间变异性，北京东南部的浓度较高，西北部的浓度较低，这是由于各种当地 BC 源（如交通和工业）的排放强度不同。由于特定的气象条件，如城市混合层高度较低，以及各种人为活动，如市中心夜间重型车辆交通专用，夜间 BC 浓度经常较高。
