卫星和地基遥感观测资料约束下的核-壳态气溶胶光学特性模拟研究  

Analysis of Core-Shell Mixed Aerosol Optical Properties Constrained by Satellite and Ground-Based Remote Sensing Observations

作　　者：王新莹 秦凯[2] Cohen Jason 王硕[3] Wang Xinying;Qin Kai;Cohen Jason;Wang Shuo(School of Atmospheric Sciences,Sun Yat-sen University,Zhuhai 519000,Guangdong,China;School of Environment and Spatial Informatics,China University of Mining and Technology,Xuzhou 221018,Jiangsu,China;Carbon Neutrality Institute,China University of Mining and Technology,Xuzhou,221018,Jiangsu,China)

机构地区：[1]中山大学大气科学学院,广东珠海519000 [2]中国矿业大学环境与测绘学院,江苏徐州221018 [3]中国矿业大学碳中和研究院,江苏徐州221018

出　　处：《光学学报》2024年第6期329-340,共12页Acta Optica Sinica

基　　金：国家自然科学基金(42075147,41975041)。

摘　　要：针对结合星地观测与模型定量模拟消光性气溶胶光学特性及黑碳质量空间分布这一热点问题,利用TROPOMI卫星紫外波段观测数据与AERONET地基观测数据,基于“核-壳”假设下的米散射模型提出了一种准确量化黑碳气溶胶质量空间分布的模拟方法,并对北京、中国香港、首尔三个站点的模拟结果进行分析与验证。多源数据约束后米散射模型模拟得到的结果显示:北京的吸收系数在0.04~0.13之间,中国香港的吸收系数整体小于0.08,首尔的吸收系数介于0.02~0.06之间。计算得到的黑碳气溶胶柱内质量空间分布结果显示:北京站黑碳气溶胶柱内质量在200~600 kg/grid之间,中国香港站黑碳气溶胶柱内质量在180~650 kg/grid之间,首尔站黑碳气溶胶柱内质量在300 kg/grid以下。结合卡尔曼滤波排放清单与一阶箱模型对黑碳气溶胶柱内质量结果进行间接验证,计算得到的黑碳气溶胶生命周期为1~4 d不等,符合其在大气中的真实状态,说明结果具有一定可靠性。通过对比加入TROPOMI紫外波段卫星观测数据前后对模型进行约束得到的粒径分布及吸收系数结果的差异发现:加入紫外波段观测数据对模拟结果具有一定增强作用。所提方法模拟结果良好,方案具有一定应用潜力。Objective Light-absorbing aerosols have a huge impact on visibility.The atmospheric pollution they cause can pose serious risks to human health.Quantitatively assessing the optical properties and spatiotemporal distribution of lightabsorbing aerosols is of vital importance for decision-making in the management and control of complex air pollution.The dynamic changes in the physicochemical properties of light-absorbing aerosols,along with their temporal and spatial heterogeneity,introduce significant uncertainties in simulating their radiative forcing.The challenges arise from difficulties in accurately estimating particle size distribution,chemical composition,and mixed state,impeding precise retrievals through satellite remote sensing,with common model simulations and radiative transfer equations assuming the presence of external mixing for light-absorbing aerosols.However,research indicates that,especially in regions prone to pollution events like East Asia,South Asia,and Southeast Asia,a"core-shell"mixed state,with black carbon as the core and scattering aerosols like sulfates and nitrates as the shell,best represents the prevailing state of light-absorbing aerosols.Rough assumptions about aerosol states not only introduce significant errors in simulating aerosol number and mass concentrations in the atmosphere but also lead to substantial uncertainties in estimating overall radiative forcing.Methods Data from both satellite and in situ measurements are employed in the present study.First,we employ the AERONET aerosol optical depth(AOD)dataset to identify polluted days at three selected sites,and we match it in space and time with the single scattering albedo(SSA)dataset combined with the TROPOMI ultraviolet(UV)SSA dataset.Second,we utilize the Mie optical model across various combinations of core and shell sizes to establish a preliminary SSA map.Subsequently,we use SSA data from six different wavebands to constrain the SSA output from the Mie model.All calculations are conducted at a daily and grid-level res

关 键 词：TROPOMI卫星数据 AERONET 黑碳气溶胶 米散射模型 

分 类 号：X513[环境科学与工程—环境工程]