Assessing the Influence of Aerosol on Radiation and Its Roles in Planetary Boundary Layer Development  

作　　者：Zhigang CHENG Yubing PAN Ju LI Xingcan JIA Xinyu ZHANG Pengkun MA Qianqian WANG Junxia DOU Jingjiang ZHANG Jiannong QUAN 

机构地区：[1]Institute of Urban Meteorology,China Meteorological Administration,Beijing 100089

出　　处：《Journal of Meteorological Research》2021年第2期384-392,共9页气象学报（英文版）

基　　金：the National Key Research and Development Program of China(2017YFC0209604 and 2018YFF0300101);Beijing Natural Science Foundation(8204062)。

摘　　要：A comprehensive measurement of planetary boundary layer(PBL)meteorology was conducted at 140 and 280 m on a meteorological tower in Beijing,China,to quantify the effect of aerosols on radiation and its role in PBL development.The measured variables included four-component radiation,temperature,sensible heat flux(SH),and turbulent kinetic energy(TKE)at 140 and 280 m,as well as PBL height(PBLH).In this work,a method was developed to quantitatively estimate the effect of aerosols on radiation based on the PBLH and radiation at the two heights(140 and 280 m).The results confirmed that the weakened downward shortwave radiation(DSR)on hazy days could be attributed predominantly to increased aerosols,while for longwave radiation,aerosols only accounted for around onethird of the enhanced downward longwave radiation.The DSR decreased by 55.2 W m^(-2) on hazy days during noontime(1100–1400 local time).The weakened solar radiation decreased SH and TKE by enhancing atmospheric stability,and hence suppressed PBL development.Compared with clean days,the decreasing rates of DSR,SH,TKE,and PBLH were 11.4%,33.6%,73.8%,and 53.4%,respectively.These observations collectively suggest that aerosol radiative forcing on the PBL is exaggerated by a complex chain of interactions among thermodynamic,dynamic,and radiative processes.These findings shed new light on our understanding of the complex relationship between aerosol and the PBL.

关 键 词：planetary boundary layer(PBL) AEROSOL RADIATION sensible heat flux(SH) TURBULENCE 

分 类 号：P421.3[天文地球—大气科学及气象学]