引用本文:孟伟,马志强,张小玲.2012—2014年冬季北京上甸子气溶胶观测研究[J].环境科学研究,2015,28(12):1815-1822.
MENG Wei,MA Zhiqiang,ZHANG Xiaoling.Observations of Aerosols at Shangdianzi Station in Winters from 2012-2014 in Beijing[J].Reserrch of Environmental Science,2015,28(12):1815-1822.]
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2012—2014年冬季北京上甸子气溶胶观测研究
孟 伟1,2 , 马志强1,2, 张小玲1,2
1.中国气象局北京城市气象研究所, 北京 100089 ;2.京津冀环境气象预报预警中心, 北京 100089
摘要:
为了分析冬季上甸子本底站气溶胶的变化特征,利用2012—2014年每年1月上甸子本底站的能见度、ρ(PM2.5)、ρ(BC)、ρ(CO)等数据,结合气象资料对上甸子地区气溶胶特性进行分析. 结果表明:2012—2014年每年1月地面月均风速分别为2.5、2.4和2.4 m/s,RH(相对湿度)分别为45.6%、59.5%和45.8%,ρ(PM2.5)分别为38.6、54.7和45.2 μg/m3,MSE(气溶胶质量散射系数)分别为5.3、5.9和4.9 m2/g. 虽然地面风速基本没有变化,但2013年1月的RH比2012年和2013年1月平均高出30%,并且同期ρ(PM2.5)和MSE也高于2012年和2013年1月. ρ(PM2.5)的增加导致太阳辐射减弱,但对SSA(气溶胶单次反照率)影响不大. 对2013年1月数据分析可知,各种RH区段下,能见度与ρ(PM2.5)均呈负相关,其中在80.0%10 km时,bext和Bext(分别以能见度和大气组分计算的大气消光系数)基本相当,二者在这3年的拟合斜率平均值高达0.99;当能见度<5 km时,2014年1月的bext和Bext之间不存在线性关系,2012年和2013年1月的bext和Bext的R2分别是0.88和0.92.
关键词:  能见度  PM2.5  消光系数  上甸子
DOI:
分类号:
基金项目:中国气象局气候变化专项(CCSF201505);北京市科委首都蓝天行动培育专项(Z141100001014013);中国科学院战略性先导科技专项(B类)(XDB05020202)
Observations of Aerosols at Shangdianzi Station in Winters from 2012-2014 in Beijing
MENG Wei1,2, MA Zhiqiang1,2, ZHANG Xiaoling1,2
1.Institute of Urban Meteorology, China Meteorological Administration, Beijing 100089, China ;2.Environmental Meteorology Forecast Center of Beijing-Tianjin-Hebei, Beijing 100089, China
Abstract:
Abstract: In order to analyze the characteristics of aerosol changes at Shangdianzi background station in winters from 2012 to 2014, air environmental chemical factors were observed including air visibility, PM2.5, BC, radiation and CO in each January to study the aerosol characteristics combined with meteorological data. The results showed that the average speeds of the ground wind in the three years were 2.5,2.4 and 2.4 m/s, and the relative humidities were 45.6%, 59.5% and 45.8%, while the MSE(mass scattering efficiency) were 5.3,5.9 and 4.9 m2/g separately. Comparing the results, the ground wind speed did not change obviously, while the relative humidity increased by 30% in 2013. Both PM2.5 mass concentration and aerosol MSE were higher in 2013 than those in the other two years. The increase of PM2.5 concentration weakened the solar radiation, but it did not have an obvious effect on the aerosol single scattering albedo (SSA). According to the data in 2013, visibility and PM2.5 concentrations were negatively correlated in various RH segments. The RMSE(root mean square error) reached a peak of 1.43 when RH was less than or equal to 70.0%, while it was 1.98 when the RH was greater than 70.0% and less than 80.0%, and it was 1.42 when the RH was greater than 80.0% and less than 100%. When visibility was more than 10 km, the bext(bext=2.996/visibility) and Bext (Bext=bag+bsg+bap+bsp) were roughly equal, and the three-year average slope fitting was up to 0.99; when visibility was less than 5 km, there was no linear relationship between bext and Bext in 2014. The squares of linear correlation coefficient between bext and Bext were 0.88 and 0.92 in 2012 and 2013, respectively.
Key words:  visibility  PM2.5  extinction coefficient  Shangdianzi