南京一次大雾过程边界层特征分析  

Boundary Layer Characteristics of a Heavy Fog Event in Nanjing

作　　者：谢旻[1,2] 王明[1] 彭珍[1] 李明高 孙鉴泞[1,2] 戎春波 

机构地区：[1]南京大学大气科学学院,江苏南京210093 [2]江苏省气候变化协同创新中心,江苏南京210093 [3]湖北省环境科学研究院,湖北武汉430072 [4]民航江苏空管分局,江苏南京211113

出　　处：《环境科学与技术》2014年第12期47-51,共5页Environmental Science & Technology

基　　金：国家自然科学基金项目(40805059;40905002);国家重点基础研究发展规划"973"项目(2010CB950704;2010CB428503);江苏省基础研究计划自然科学基金项目资助(BK2011578);江苏高校优势学科建设工程项目资助

摘　　要：雾、霾影响空气质量,特定气象条件有利于雾、霾形成。利用南京大学仙林综合观测基地的近地层湍流资料以及MICAPS气象资料,分析了2011年11月18日南京一次大雾过程的边界层特征。结果表明,大雾发生前后南京处于高空低压槽前,西南暖湿气流向南京地区输送充足的水汽,而近地面主要受到低压倒槽的控制,使得近地层相对湿度一直在90%以上。边界层上空（约300~500 m）存在很强很厚的逆温层,近地层动量通量几乎为0,感热通量也几乎为0,表明大雾期间南京地区大气一直处于稳定的边界层中,近地层湍流很微弱,有利于大雾的形成和维持。能谱分析表明,能谱高频段满足-2/3率,但中低频率部分可能由于非均匀下垫面地形的影响,分布比较杂乱。Fog and haze can affect air quality,and are subject to some special meteorological conditions. Based on the surface layer turbulence data measured in Xian Lin Campus of Nanjing University and the meteorological datasets from MICAPS,the boundary layer characteristics of a heavy fog event in Nanjing on Nov. 18,2011 were discussed. Results showed that Nanjing was affected by a low pressure trough in the sky,which led to the transportation of warm and humid vapor from the southwest ocean. And the surface layer of Nanjing was under control of an inverted trough,which caused the relative humidity above 90% during the event. There was a very strong and deep inversion layer above Nanjing. The value of momentum flux and the heat flux was very small. The atmosphere was quite stable so that the turbulence of ground layer was very weak,which was helpful to build and keep the heavy fog. The high frequency part of energy spectra adjusted to Kolmogorov＇s-2/3 law perfectly. However,the distribution of low frequency was messy because of heterogeneous ground condition.

关 键 词：雾 边界层 逆温层 湍流通量 能谱 

分 类 号：X511[环境科学与工程—环境工程] P404[天文地球—大气科学及气象学]