CAJ | 학술논문

“城市气象/示踪试验”在中国西北甘肃省榆中县的城市区域内(3 km×3 km)构建了一个精细化的观测网，对气象场和示踪物浓度场进行了高时空分辨率的观测。利用观测资料初步分析了城区内流场及示踪物的输送扩散特征。结果表明：受不同尺度运动相互作用的影响，城区流场十分复杂；城市冠层顶风场与示踪物浓度场有较好的对应，即浓度高值区基本出现在主导风向下风方向±20?的扇形区域内且呈现出近似为正态分布的特征，同时地面和城市冠层顶示踪物的浓度分布存在明显差异。
“성시기상/시종시험”재중국서북감숙성유중현적성시구역내(3 km×3 km)구건료일개정세화적관측망，대기상장화시종물농도장진행료고시공분변솔적관측。이용관측자료초보분석료성구내류장급시종물적수송확산특정。결과표명：수불동척도운동상호작용적영향，성구류장십분복잡；성시관층정풍장여시종물농도장유교호적대응，즉농도고치구기본출현재주도풍향하풍방향±20?적선형구역내차정현출근사위정태분포적특정，동시지면화성시관층정시종물적농도분포존재명현차이。
The Urban Meteorological and Tracer Experiment was carried out within a 3 km×3 km urban region in Yuzhong County, Lanzhou. Both the meteorological and the tracer concentration fields were observed with a high spatiotemporal resolution during the experiment. Characteristics of wind field and tracer diffusion within the urban area were analyzed. The results show that, due to the interaction between motions with different scales, the flow field within the urban area was very complex. Tracer concentrations matched well with the wind field above urban canopy layer (UCL), with high tracer concentrations appearing downwind of the predominant wind within a sector of ±20? around the main wind direction and approximate normal distribution in crosswind direction. The ground distribution of tracer concentrations was significantly different from that above the UCL.