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BECAPEX科学试验城市建筑群落边界层大气环境特征及其影响 预览 被引量:19

CHARACTERISTICS OF ATMOSPHERIC ENVINRONMENT OF BOUNDARY LAYER STRUCTURE OF CITY COMMUNITY IN BECAPEX AND INTEGRATE INFLUENCE
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摘要 2001~2003年在北京实施了大气边界层动力、热力、化学综合观测试验(BECAPEX,Beijing City Atmospheric Pollution Observation Field Experiment),获取了北京城市大气动力和大气化学三维结构图像。综合观测试验分析研究发现,城市区域呈非均匀次生尺度热岛分布,并伴随着城市次生尺度环流,影响了局地空气污染物分布特征。MODIS卫星遥感一地面观测资料经过变分分析,可发现北京城市空气污染与周边区域影响源有密切关系,并影响城市群落环境气候特征,导致该区域日照、雾日、低云量和能见度呈显著年代际变化趋势。 The Beijing City Atmospheric Pollution Observation Field Experiment (BECAPEX) was deployed during 2001—2003 to obtain the 3-dimensions structure integrate images of Beijing atmospheric dynamic and chemical process. Research on the integrated observations show the thermal-dynamic structure of city area is a non-uniform secondary heat island with a secondary circulation, which affects the distribution of the local pollutants. The data revealed the existence of an air dome (a dome-shape boundary layer) around urban Beijing and provided a comprehensive set of parameters that defined the characteristics of the air dome. Important findings of this study include the synchronous characteristics of the life cycle of pollutants within the urban atmospheric boundary layer and obvious diurnal variation of pollutants in the boundary layer or under the air dome. In fact, the data reveal that the air dome acts like a large canopy covering the city of Beijing. This phenomenon is closely associated with the temperature inversion and the vertical structure of the boundary layer. Moreover, the diffusion and distribution of air pollutants are related to the multiscale interaction among large-scale circulation, mountain and valley wind, and urban heat island circulation. As a result, air pollution in Beijing usually come from local sources, but the sources in the vicinity also have prominent influence. Features of the urban heavy pollution processes of Beijing are significantly correlated with the impact of the emission sources of southern peripheral cities, and the pollutants transferred northwards from distant upstream sources are retarded by the U-shape “valley” topography in Beijing's periphery. The two factors are responsible for the formation of the S-N zonal influencing domain of pollutants from the southern peripheral areas to Beijing. The variational correction analysis of MODIS RS-surface observations indicate that Beijing air pollution has close relationship with its surrounding regional influencing sources, an
作者 徐祥德 丁国安 卞林根 谢立安 Xu Xiangde Ding Guoan Bian Lingen (Chinese Academy of Meteorology Sciences, Beijing 100081) Xie Lian (North Carolina State University, Department of Marine, Earth and Atmospheric Sciences,USA)
出处 《气象学报》 CSCD 北大核心 2004年第5期663-671,F005共10页 Acta Meteorologica Sinica
基金 国家重点基础研究发展规划项目 (G19990 45 70 0 ) 中美合作城市大气环境观测试验综合研究项目
关键词 大气环境特征 地面观测 观测试验 年代际变化 大气化学 云量 大气边界层 群落 科学试验 环境气候 BECAPEX Air Dome,Atmospheric dynamic-chemical process,Integrate image.
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