Measurements of gas and aerosol for two weeks in northern China during the winter–spring period of 2000, 2001 and 2002
Measurements of gas and aerosol for two weeks in northern China during the winter–spring period of 2000, 2001 and 2002
复制标题
DOI：
10.1016/j.atmosres.2006.02.023
复制
发表时间：
2006-12
影响因子：
5.5
通讯作者：
A. Takami;Wei Wang;D. Tang;S. Hatakeyama
中科院分区：
文献类型：
--
作者：
A. Takami;Wei Wang;D. Tang;S. Hatakeyama
在2000年、2001年和2002年的冬春季节，在青岛、凤凰山和大连分别进行了为期2周的大气和气溶胶的密集观测。2000年1月18日青岛和凤凰山都出现了高浓度SO2。通过对大气中SO2浓度的后向轨迹计算和分析，认为高浓度SO2事件是由局地污染和输送造成的。硝酸盐、硫酸盐和铵是PM2.5中的主要组分。2002年青岛市PM2.5中NO3-、nss-SO 42-和NH 4+的质量分数分别为10%、12%和5.5%，均高于nss-Ca 2+的质量分数（1%）。在大连和凤凰山观测到的化学成分与青岛相似。青岛冬季的nss-SO 42-/SO2质量比较低（<1.2），表明冬季硫酸盐可能是由SO2在气相中缓慢氧化生成和/或由青岛以外地区输送而来。NH 4+与nss-SO 42 −的当量比为1.39，表明硫酸铵是PM2.5的主要化学成分之一。青岛的NO3-/SO 42-比值高于东亚偏远地区。在凤凰山获得的气体和气溶胶数据与青岛的数据相似，表明小城市的排放可能对中国北方的污染有很大影响。
Intensive measurements of gas and aerosol for 2weeks were carried out at Qingdao (gas and aerosol in 2000, 2001 and 2002), Fenghuangshan (gas and aerosol in 2000 and 2001), and Dalian (aerosol in 2002) in the winter–spring period. High SO2episodes were observed on 18 January 2000 at both Qingdao and Fenghuangshan. According to back trajectory calculations and analysis of gaseous species, high SO2episodes were caused by local pollution and transport. Nitrate, sulfate and ammonium were the major species in PM2.5. Mass fractions of NO3−, nss-SO42−and NH4+at Qingdao in 2002 were 10%, 12% and 5.5% for PM2.5, respectively, which were higher than that of nss-Ca2+(1%). Chemical compositions observed at Dalian and Fenghuangshan were similar to those at Qingdao. The mass ratio of nss-SO42−/SO2at Qingdao in winter was low (<1.2), indicating that sulfate was probably produced by the slow oxidation of SO2in the gas phase and/or was transported from outside of Qingdao in winter. The equivalent ratio of NH4+to nss-SO42−was 1.39, suggesting that ammonium sulfate was one of the major chemical compositions in PM2.5. The NO3−/SO42−ratio at Qingdao was higher than that at remote places in East Asia. Gas and aerosol data obtained at Fenghuangshan were similar to data at Qingdao, suggesting that emissions from small cities may have a great influence on pollution in northern China.