Evolution of planetary boundary layer under different weather conditions,and its impact on aerosol concentrations

被引：40

作者：

Jiannong Quan ^{[1
,2
]}

Yang Gao ^{[1
]}

Qiang Zhang ^{[1
]}

Xuexi Tie ^{[3
,4
]}

Junji Cao ^{[5
]}

Suqin Han ^{[6
]}

Junwang Meng ^{[1
]}

Pengfei Chen ^{[1
]}

Delong Zhao ^{[1
]}

机构：

[1] Beijing Weather Modification Office

[2] Institude of Urban Meteorology,CMA

[3] Key Laboratory of Aerosol,SKLLQG,Institute of Earth Environment,Chinese Academy of Sciences

[4] National Center for Atmospheric Research,Boulder,USA

[5] Key Laboratory of Aerosol,SKLLQG,Institute of Earth Environment.Chinese Academy of Sciences

[6] Tianjin Institute of Meteorological Sciences

来源：

Particuology | 2013年 / 11卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Planetary boundary layer(PBL); Interaction between the PBL and aerosols;

D O I：

暂无

中图分类号：

X513 [粒状污染物];

学科分类号：

0706 ; 070602 ;

摘要：

A field experiment was conducted in Tianjin,China from September 9-30,2010,focused on the evolution of Planetary Boundary Layer(PBL) and its impact on surface air pollutants.The experiment used three remote sensing instruments,wind profile radar(WPR),microwave radiometer(MWR) and micro-pulse lidar(MPL),to detect the vertical profiles of winds,temperature,and aerosol backscattering coefficient and to measure the vertical profiles of surface pollutants(aerosol,CO,SO2,NOx),and also collected sonic anemometers data from a 255-m meteorological tower.Based on these measurements,the evolution of the PBL was estimated.The averaged PBL height was about 1000-1300 m during noon/afternoon-time, and 200-300 m during night-time.The PBL height and the aerosol concentrations were anti-correlated during clear and haze conditions.The averaged maximum PBL heights were 1.08 and 1.70 km while the averaged aerosol concentrations were 52 and 17μg/m3under haze and clear sky conditions,respectively. The influence of aerosols and clouds on solar radiation was observed based on sonic anemometers data collected from the 255-m meteorological tower.The heat flux was found significantly decreased by haze (heavy pollution) or cloud,which tended to depress the development of PBL,while the repressed structure of PBL further weakened the diffusion of pollutants,leading to heavy pollution.This possible positive feedback cycle(more aerosols→lower PBL height→more aerosols) would induce an acceleration process for heavy ground pollution in megacities.

引用

页码：34 / 40

页数：7

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