瓦里关黑碳气溶胶监测数据的分析与研究  

Analysis of Black Carbon Aerosol Monitoring Data at Mt.WaliguanObservatory

作　　者：张国庆[1] 吴昊 赵玉成[1] ZHANG Guoqing;WU Hao;ZHAO Yucheng(China Global Atmospheric Watch Baseline Observatory,Xining 810001,China;Institute of Electrical Engineering,Chengdu University of Information Technology,Chengdu 610225,China)

机构地区：[1]中国大气本底基准观象台,青海西宁810001 [2]成都信息工程大学电子工程学院,四川成都610225

出　　处：《沙漠与绿洲气象》2024年第6期154-159,共6页Desert and Oasis Meteorology

摘　　要：以瓦里关全球本底站1994—2017年黑碳气溶胶监测数据为基础,研究分析黑碳气溶胶浓度值的时间变化及输送特征。结果表明:黑碳气溶胶浓度总体水平较低,明显低于我国东部地区,自2011年起呈现逐年减小趋势。季节变化显著,最高值出现在每年冬、春季的3—4月,最低值出现在秋季的11月左右;日变化较为明显,夜间浓度相对较高,白天浓度相对较低。黑碳气溶胶的输送与风向、风速密切相关,在偏东风向下浓度较高,并随着风速增大而增加,反映了站点偏东区域人类活动产生的黑碳气溶胶对站点观测值的影响;其余方位平均黑碳浓度值偏小,在小风时出现浓度高值区,随风速增大而减小,反映了站点其他方向相对清洁,人类活动的影响较小。高原上冬、春季偏西风气流为主,西南气流和高原地形影响下近地层较强偏东气流输送,以及冬春季采暖燃烧的排放,使得瓦里关站黑碳气溶胶相对较高;夏、秋季由于季风气流的影响,也会使东部源区的黑碳气溶胶沿着河谷向西输送,但由于降水增多,降水清除使瓦里关站黑碳气溶胶浓度相对较低。Based on the longtime monitoring data(1994-2017)of black carbon(BC)at Waliguan global baseline station,this study elucidated the temporal variations and transport characteristics of BC concentrations at the station.The results showed that the overall level of BC concentration at Waliguan was lower than those in eastern China,and had been continuously decreasing since 2011 on yearly basis.The seasonal variation was significant,with the highest BC values found in March and April,while the lowest value occurred in autumn(November)every year.Considering the diel variations of BC,high concentrations were associated with nighttime,while low concentrations were observed during the daytime.The transport of BC was greatly influenced by wind direction and wind speed.The BC concentration was higher in the easterly wind direction and increased with an increase in wind speed,which reflected that the higher level of emitted BC attributed to anthropogenic activities in the eastern part of the station.The average BC concentrations were relatively low in other wind directions,an indication of very low anthropogenic emissions.Winter and spring on the plateau were dominated by westerly airflow,which was influenced by southwesterly and strong easterly air transports near the surface due to the influence of the plateau topography,as well as emissions during the heating period in winter and spring,resulting in relatively high levels of BC at Waliguan station during the two seasons.Furthermore,in summer and autumn,due to the influence of the monsoon airflow,the BC in the eastern area was also transported westward along the river valley,however,due to the removal effect by precipitation,the BC concentration at Waliguan station was relatively low during both summer and autumn periods.

关 键 词：瓦里关 黑碳气溶胶 变化特征 输送特征 

分 类 号：X513[环境科学与工程—环境工程]