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Nanjing University of Information Science and Technology (2019)

Dust Storm Simulation Coupled with Refined CALMET Wind Field in Tarim Basin


Titre : Dust Storm Simulation Coupled with Refined CALMET Wind Field in Tarim Basin

Auteur : 刘炤寰;

Grade : Master’s Theses 2019

Université : Nanjing University of Information Science and Technology

Résumé partiel
Dust aerosol is the most important component in the atmosphere,an important link that causes the interaction of the atmosphere,the biosphere and the lithosphere,and a key link in the global material cycle and climate change.The center of the Tarim Basin is the Taklimakan Desert.It is the second largest mobile desert in the world.It is a high-incidence center for dust storms in China and a high-risk center for dust storms.It raises dust aerosols through the parasol effect,ice core effect and iron.The fertilizer effect affects regional and global climates and has become one of the hotspots for studying global change.Although the Taklimakan Desert covers an area of 330,000 square kilometers,and the meteorological observatory is limited to the oasis on the edge of the desert,the meteorological observations throughout the desert are almost blank.The uniqueness of the basin climate and the blank of large area observations make the spatial distribution of meteorological elements such as temperature,wind direction and wind speed impossible to be obtained by interpolation.The surface wind element data is missing,and the alternatives such as NCEP reanalysis or FNL analysis of wind element data are almost completely ineffective in this area of the Tarim Basin,which in turn will lead to all wind-related sands driven by reanalysis data.Dust mode fails in this area.Because the Taklimakan Desert is the high-risk center of the global dust storm,it can raise a large amount of dust aerosols to affect the regional and global climate,and carry out a refined simulation of the wind field in this area,and then use the sandstorm pattern to accurately simulate the dust storm process in the basin.To assess the amount of sandstorms,it has important scientific and practical value for the study area and global climate change.In view of the above problems,this paper attempts to correct the wind field in the Tarim Basin by using the CALMET module in the CALPUFF simulation system by using the observation data of desert aeolian landforms and meteorological wind conditions,and obtaining fine The surface wind field is coupled into the sandstorm pattern to improve the accuracy of the sandstorm process in the Tarim Basin.The main conclusions are as follows:1)Observations from 1995 to 2017 show that the most common place for sandstorms is the desert hinterland,where the most marginal oasis occurs at the southeastern end of the basin,followed by the southern Hetian-Peshan area and the Keping-Alar area in the north.

Mots clés : sand and dust weather; CALMET model; cold air intrusion path; surface wind field;

Présentation (CNKI)

Page publiée le 28 avril 2020