观测约束下的煤矿区吸光气溶胶特性模拟研究  

Simulation of Absorbing Aerosol Characteristics in Coal Mine Area Under Observation Constraint

作　　者：关萝尧 Cohen Jason Blake 秦凯[1] 王硕 Tiwari Pravash[1] Guan Luoyao;Cohen Jason Blake;Qin Kai;Wang Shuo;Tiwari Pravash(School of Environment Science and Spatial Informatics,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China;Carbon Neutrality Institute,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China)

机构地区：[1]中国矿业大学环境与测绘学院,江苏徐州221116 [2]中国矿业大学碳中和研究院,江苏徐州221116

出　　处：《光学学报》2024年第18期245-255,共11页Acta Optica Sinica

基　　金：中央高校基本科研业务费(2024QN11067);国家自然科学基金(42075147)。

摘　　要：利用黑碳仪、光学粒度仪和太阳光度计在山西省长治市煤矿区开展连续实地观测,结合“核-壳”假设下的米散射模型,对煤矿区吸光气溶胶光学特性进行建模,提出一种基于多源地基观测快速反演吸光气溶胶单次散射反照率(SSA)的方法,并通过使用吸收Angstrom指数对模拟结果进行约束,分析了不同混合状态下吸光气溶胶光学特性的变化规律。结果表明:1)煤矿区吸光气溶胶粒径分布与污染条件相关,重度污染条件下粒径较大,中度污染条件下粒径较小,其中不同污染条件均在0.28~0.3μm等较小粒径区间内存在峰值,这表明排放源对粒径分布有重要影响;2)基于“核-壳”假设的米散射模型可以模拟不同混合状态下吸光气溶胶的SSA,以440 nm粒径为例,在均匀假设下SSA为0.43~0.72,在非均匀假设下SSA为0.41~0.65,这表明使用多波段、多粒径信息可以更准确地获取吸光气溶胶光学特性;3)吸收Angstrom指数只能在部分粒径区间与SSA相匹配,且无法应用至较大粒径区间,表明通过吸收Angstrom指数评估吸光气溶胶SSA的方法会产生偏差,应综合考虑粒径分布、混合状态和波长对其产生的影响。Objective In coal mining regions,extensive coal dust is generated during mining,transportation,and storage,coupled with substantial black carbon produced resulting from incomplete coal combustion in the industry chain.Over time,these materials form absorbable substances,evolving into core-shell aerosols with inorganic salt shells.These aerosols,including sulfate,nitrate,and water,exert significant climate impacts through direct and indirect radiation effects.The environmental and radiative forcing effects are substantial.Absorbing aerosol demonstrates strong solar radiation absorption across the ultraviolet to infrared spectrum.However,past studies primarily focus on their optical properties in visible and infrared bands,overlooking ultraviolet band absorption.Current research often assumes a lognormal particle size distribution for absorbing aerosols,neglecting variations in distribution and optical properties resulting from diverse emission scenarios.Therefore,a thorough analysis of absorbing aerosol optical properties at local scales is crucial.Quantitative assessments of particle size distribution,mixing state,and spatio-temporal variations are vital for elucidating the intricate interactions with boundary layer development,radiative forcing changes,and air pollution.Methods In our study conducted in the coal mining area of Changzhi City,Shanxi Province,various datasets are collected,including surface black carbon concentration,particle size distribution,and columnar aerosol optical depth(AOD).The investigation commenced with the utilization of the variance maximization method to categorize AOD data into distinct pollution events.Subsequent analysis involved evaluating the particle size distribution corresponding to different pollution degrees through probability density functions.The uncertainty of particle size for the desorption aerosol core and shell is then determined by integrating black carbon mass concentration data and particle size distribution information.These uncertainties are then used as input

关 键 词：单次散射反照率 吸光气溶胶 米散射模型 煤矿区 

分 类 号：X513[环境科学与工程—环境工程]