کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6576987 | 1422841 | 2017 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Chemical characteristics of PM2.5 during haze episodes in spring 2013 in Beijing
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم زمین و سیاره ای (عمومی)
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چکیده انگلیسی
A continuous daily PM2.5 sampling campaign from 10 April till 8 June 2013, including three haze episodes, was conducted in Beijing. Chemical species, including EC, OC, water-soluble ions and inorganic elements, were analysed by a thermal/optical carbon analyser, IC and ICP-MS, respectively. A comparison of air quality during such haze episodes in relation to clear air situations, as well as the differences between the haze episodes was emphasised. The results showed that the most important fractions of PM2.5 during haze were SO42â, NO3â and NH4+ (namely, SNA) which together accounted for 54-61% of the total PM2.5 mass. Estimated secondary organic carbon (SOC) was also found to be increased during haze, but the relative increase compared to clear days was much lower than for SNA, leading to a decrease in relative contribution of SOC to PM2.5 in the observed haze events. Cluster analyses from back trajectories showed four air mass clusters during spring 2013 and air flow, which was from the south-easterly directions, might favour the accumulation of PM2.5, especially SNA and anthropogenic elements. All these results proved that the anthropogenic air pollution in the Southeast of Beijing was responsible for the formation of hazes in Beijing during spring 2013.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Urban Climate - Volume 22, December 2017, Pages 51-63
Journal: Urban Climate - Volume 22, December 2017, Pages 51-63
نویسندگان
Rongrong Shen, Klaus Schäfer, Longyi Shao, Jürgen Schnelle-Kreis, Yuesi Wang, Fengxia Li, Zirui Liu, Stefan Emeis, Hans Peter Schmid,