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Lanzhou University (2020)

Numerical Simulation of Dust Weather,and the Transportation and Sources of Dust Aerosol in Different Seasons in Northwest China

彭路

Titre : Numerical Simulation of Dust Weather,and the Transportation and Sources of Dust Aerosol in Different Seasons in Northwest China

Auteur : 彭路;

Grade : Master’s Theses 2020

Université : Lanzhou University

Résumé partiel
Dust weather is a kind of special disastrous weather in arid areas,which makes the fragile ecological environment of Northwest China worsen further,and has a serious impact on air quality,human health and social economy.The Northwest District is located in the inland of Northwest China,with complex climate characteristics and diverse land types.It is an area with high frequency of dust weather in China,and an important contribution source of dust storm area in Central Asia.Dust weather occurs mostly in spring and appeared in winter in 2017.Therefore,it is of practical significance to study the characteristics of dust weather in different seasons,transport of particles and potential source areas in this area.In this paper,firstly,WRF-Chem model,NCEP data,coupled with MOZART-MOSAIC chemical aerosol scheme,AFWA sand scheme were used to simulate the two dust processes in spring and winter in the northwest of China in 2017.The meteorological station observations verified the simulation effect of the model on sand and dust weather,meanwhile this paper showed the changing process of sand and dust weather and sand and dust concentration.Secondly,by using HYSPLIT model,potential source contribution factor analysis(PSCF)and weight concentration method(CWT),the movement track of two dust weather air masses was traced,and the influence degree of potential source area on the concentration of PM10 in Northwest typical cities was quantitatively calculated.Finally,by using hourly monitoring data,the characteristics of PM10 and PM2.5 concentration changed and the pollution characteristics in the early,middle and later stages of dust occurrence were analyzed,and then the relationship between atmospheric particles and wind speed and temperature was further analyzed.The main results are as follows :(1)The WRF-Chem model can well reproduce the process of dust weather change.The main influencing factors of dust process in spring were cyclones and cold front on the ground,and in winterwere cold front on the ground.The main source areas of sand dust in spring are Tarim Basin and its surrounding areas in South Xinjiang,northwest Inner Mongolia and North Shaanxi,and Turpan Basin and Kumtag Desert in winter.At the same time,the movement of dust air mass in Tarim Basin and Northern Gansu Province was also well captured.

Mots clés : dust weather; dust aerosol; WRF-Chem; transport path; potential source area

Présentation (CNKI)

Page publiée le 22 mai 2021