Study On The Monitoring Method Of Night Haze In Beijing Area Based On Radiative Transfer Model

With the accelerated developm ent of the c ity,to achiev e sustainable social and economic achievements,National City,industrial evolution process has deepened,but it has caused a series of environmental problems,involving the atmosphere,water,soil and other aspects,which bear the brunt of the haze problem.In recent years,the haze problem has gradually risen to the focus of the major cities,how to effectively control the haze has become an important work of the government.Want to deal with haze problem,we must do haze monitoring.Haze monitoring,PM2.5 is an im portant indicator.PM2.5 is a kind of small particle aerosol,which is harm ful to human health.At present,the monitoring methods for the use of the radiative transfer model to retrieve aerosol optical thickness,compared with standard aerosol products such as MODIS,to monitor effect,but most of the models are currently daytime haze retrieval algorithm,the radiation transmission path for sun ground sensor,because the night light contains natural light and arti ficial light,so the daytime inversion algorithm haze cannot be applied to night haze monitoring.In this paper,based on the principle of radiative transfer,we build a model of the night haze radiative transfer,and obtain 2 kinds of available haze monitori ng models.The main work of this paper is divided into 4 parts as follows:(1)The background,purpose,significance,re search status and progress of haze monitoring are introduced in detail.Firs tly introduces the background,purpose and significance of the research and then introduces the haze,research status and progress,including monitoring based on remote sensin g images and aerosol o ptical thickness monitoring based on,and finally introduces the research contents and technical route.(2)This paper introduces th e general situation of the study area,and analyzes the data types,for mats and treatm ent methods of the haze m odel.Taking Beijing as an example,the study area included S uomi-NPP/VIIRS DNB data,MODIS data,GEOS boundary layer height data and other ground st ation data.Data format involves HDF4,H5,NC and TIFF and other data,the text to IDL and JAVA as a processing tool.(3)The remote sensing monitoring m ethod,radiative transfer equation and typical radiative transfer model are analyzed in de tail.Analysis of haze monitoring method of remote sensing comprehensive analysis based on rem ote sensing image change method based on aerosol optical thickness monitoring and haze haze monitoring;shows the key point of extinction cross section,the m ass extinction rate,etc.the Lambert Law of radiative transfer process;introduces five typical radiative transfer model 6S,LOWTRAN,MODTRAN,FACODE,SBDART and analysis of the advantages and disadvantages of each model.(4)Construction of nighttime haze model.Based on the radiative transfer theory,the basic process of radiative transfer,some assumptions are b ased on rad iative transfer equation,get the nigh t haze rad iative transfer model;through ID L and JA VA programming language to realize the m odel parameters acquisition and processing;and then the obtained data were analyzed,to identify the data valid ity and practicability;robust to validate the model,the model can explain the variation rate and degree of robust test method of nonlinear regression an alysis;boundary layer height data and PM2.5 correlation,the boundary layer height as a new parameter into the model,to form a new night haze monitoring model based on the robustness of the new model and the original model were analyzed.