Airborne Observation of Wintertime Aerosols Vertical Distributions in Northern Guangdong
GAO Jianqiu
LI Junxia
HE Songwei
DU Jiaming
CUI Yi
WANG Wuyi
WANG Gang
Abstract：From 18 to 20 January 2024,aerial observations of atmospheric aerosol spatial distribution were conducted for the first time in northern Guangdong using a weather modification aircraft,establishing baseline data to assess the region's ecological barrier effectiveness.This study analyzes the vertical distribution characteristics of aerosol number concentration,effective diameter,and particle size distribution in winter in northern Guangdong utilizing the data from two flights(including aerosol,cloud droplet,and comprehensive meteorological observations),wind profile radar data and ERA5 reanalysis data,combined with synoptic weather analysis.The results indicate that during the observation period,under stable and clear weather conditions the aerosol number concentration in the northern Guangdong region reached a maximum of 1 679 cm-3,with a mean value of approximately 1 000 cm-3 below 1 500 m and an average effective diameter of 0.3 μm.The average aerosol size distribution exhibited a bimodal structure,with peaks at 0.14-0.15 μm and 0.20-0.22 μm.The average aerosol size distribution width decreased with altitude,measuring 3 μm below 1 800 m and 1 μm above 1 800 m.The peak concentration of aerosol particle size distribution below 500 m was approximately 140-160 particles·cm-3.Overall,aerosol number concentration decreased with altitude,exhibiting a sharp drop at the top of the boundary layer.The presence of an inversion layer resulted in relatively high concentration zones at multiple altitudes.Long-range transport influenced the variation of aerosol number concentration in the upper atmosphere.From the surface to high altitudes,atmospheric conditions with a relative humidity greater than 80％throughout the entire layer facilitated the hygroscopic growth of soluble aerosol particles during their upward transport.
Keywords：Winter in Northern GuangdongAerosol number concentrationvertical distributioneffective diameteraircraft observation
Publication Date：2025-04-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：11( 178-188 )