珠江三角洲东部低层大气流动与中尺度扩散特性

蔡旭晖; 张祯玺; 康凌; 陈家宜

珠江三角洲东部低层大气流动与中尺度扩散特性

1.
北京大学环境科学系, 北京, 100871
2.
北京大学环境模拟与污染控制国家重点实验室, 北京, 100871

基金项目: 教育部骨干教师计划资助

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出版历程
- 收稿日期: 2004-06-21
- 修回日期: 2004-10-18

A STUDY ON LOWER-LAYER ATMOSPHERIC FLOWS AND MESO-SCALE DIFFUSION PATTERNS OVER THE EASTERN AREA OF THE PEARL RIVER DELTA

1.
Department of Environmental Sciences, Peking University, Beijing 100871, China
2.
State Key Laboratory of pollution control and simulation, Peking University, Beijing 100871, China

摘要

摘要: 采用拉格朗日随机粒子扩散模式和三维风场诊断模式及实际气象观测资料,模拟分析以大亚湾核电厂厂址为中心的珠江三角洲东部地区低层大气流动和气载污染物的中尺度扩散情况。结果表明:(1)该区域低层大气流动受盛行风背景、天气系统、海陆风局地环流以及当地地形扰动的共同作用,季节变化明显。(2)冬-春-秋季,核电厂扩散的可能影响区域总体分布在偏北内陆方向和西南方的珠江出海口及外海地区,夏季总体分布于北方内陆地区。(3)污染物扩散输送出200km×200 km模拟区域的平均时间约12~20 h;污染物在模拟区域内滞留24
- 大气扩散 /
- 核电厂 /
- 珠江三角洲东部
Abstract: A Lagrangian stochastic model and a three-dimensional wind field diagnostic model are used to reveal the characteristics of lower-layer atmospheric flows and diffusion patterns over the eastern part of the Pearl River Delta,Guangdong province.Observed meteorological data are used and the dispersion from a virtual source located at the Dayawan nuclear power station,which is at the center of the model domain,is simulated.Results shows:(1) Lower atmospheric flows in this area are determined by prevailing background wind,synoptic system,the sea-and land-breeze circulation as well the local topography.(2) Dispersion paths direct towards the north inland and the southwest corner of the model domain for winter,autumn and spring,while a northerly pattern for summer.(3) The average time for air pollutants transport out of the model domain is 12-20 h,approximately.There are about 1/5 cases in winter,spring and autumn that air pollutant may stay in the domain for more than 24 h before they transport out.However,the cases in summer are much less,only 1/20 approximately.
- atmospheric diffusion /
- nuclear power station /
- Eastern Pearl River Delta

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参考文献(10)

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