• 关键词：FLEXPART模式  上甸子大气本底站  CO浓度  源区分布特征

• 基金项目：公益性行业(气象)科研专项(No.GYHY200806026);国家自然科学基金项目(No.40875086)

• 李岩
• 兰州大学大气科学学院, 兰州 730000

• 安兴琴
• 中国气象科学研究院大气成分观测与服务中心, 北京 100081

• 姚波
• 中国气象科学研究院大气成分观测与服务中心, 北京 100081

• 周凌晞
• 中国气象科学研究院大气成分观测与服务中心, 北京 100081

• 左洪超
• 兰州大学大气科学学院, 兰州 730000

• 摘要：FLEXPART是挪威大气研究所开发的拉格朗日粒子扩散模式.为客观地评价该模式在北京地区的适用性,以北京上甸子大气本底站为例,模拟了CO浓度变化及其源区分布特征,并与该站实测CO浓度和2006年排放源清单进行了比对.结果表明:①模式模拟的CO浓度变化趋势可以较好地反映上甸子地区CO浓度的日变化规律,CO浓度的模拟值与实测值的相关系数在春夏两季分别达到0.42和0.41;②春夏两季北京市污染气团主要源地分布在西-西南和西西南-南-南南东扇区,模式结果较好地体现了北京及周边地区CO源区的分布特征.初步研究表明,FLEXPART模式在北京地区是基本适用的.

• Abstract：FLEXPART is a Lagrangian particle tracking air dispersion model which was developed by the Norwegian Institute for investigation of air quality.In order to study the applicability of FLEXPARTto Beijing,the proper parameters of FLEXPARThave been set for simulation of COconcentration and the distribution characteristics of source regions.The simulated COconcentrations are validated by the observations at Shangdianzi atmospheric background station,while the distribution characteristics of source regions are compared with the emission inventory of 2006.Based on the preliminary study,we found the model can reproduce the main characteristics of CO variation at the Shangdianzi station.The correlation coefficients of the simulated values and the observed COconcentrations are high:up to 0.42 for spring and 0.41 for summer,respectively.Model results show that polluted air masses in Beijing mainly come from the W-SWand WSW-S-SSEdirections in spring and summer seasons.Model results can reflect the distribution characteristics of source regions for COin Beijing and its surrounding areas.Our preliminary study indicates that the FLEXPARTmodel is applicable to the investigation of air quality in Beijing.

• Key words：FLEXPART model  Shangdianzi atmospheric background station  CO concentration  distribution characteristics of source regions

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