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Fuyang Normal University (2022)

Aerosol Optical Properties and Evolution in Arid and Semi-arid Regions of China ——A Case Study of Hexi Corrido

马强磊

Titre : Aerosol Optical Properties and Evolution in Arid and Semi-arid Regions of China ——A Case Study of Hexi Corridor

Auteur : 马强磊

Grade : Master 2022

Université : Fuyang Normal University

Résumé partiel
Aerosols are one of the most important and uncertain factors affecting the climate and atmospheric environment,and have significant implications on human health.Drought is one of the primary natural causes leading to the gradual deterioration of human living environment.Hexi Corridor is located in arid and semi-arid areas of northwest China,with fragile ecological environment and more affected by dust weather.It is a sensitive area of climate change.Long-term and large-scale aerosol observation in the region can provide data support for the study of long-term aerosol changes in the region and their impact on climate and environment.It can also provide data reference for ecological protection,sustainable development,air pollution prevention,improvement of human living environment and environmental governance in the region.This thesis selects four representative observation stations located in the Hexi Corridor,namely SACOL Station(also known as Lanzhou Station),Minqin Station,Zhangye Station and Dunhuang Station,which are distributed in the Hexi Corridor from east to west.Based on the aerosol observation data of CE-318 solar radiometer at these stations,the aerosol optical depth(AOD),( ?)ngstr( ?)m exponent,and complex refractive index in Hexi Corridor were analyzed,and some important characteristics and trends were found.The main conclusions are as follows :(1)Variation characteristics of AOD : from the perspective of space,there is a clear trend of high western and low eastern AOD in the region,but the AOD in Lanzhou is significantly higher than that in Minqin,which is also an eastern region.This is mainly due to the high population density in Lanzhou and the excessive aerosols produced by human activities.From the perspective of time,this area has the characteristics of the highest AOD in spring and the lowest in autumn.This is mainly due to the higher wind speed in spring,coupled with the increase in natural aerosols caused by the exposed ground.However,the AOD in Lanzhou region is also high in winter,which is mainly due to the increase of black carbon particles produced by heating combustion in winter.In terms of annual mean changes,the comprehensive data from the four stations found that AOD fluctuated but did not change much before2020,while AOD showed a significant increase in 2020,suggesting that the changes in climate and environment in the region in the last two years deserve attention and in-depth study.

Mots clés : Aerosol ;CE-318 ;Optical properties ;Variation characteristics ;Hexi Corridor ;

Présentation (CNKI)

Page publiée le 23 octobre 2022