We report on the retrieval of stratospheric aerosol particle size and extinction coefficient profiles from multi-color backscatter measurements with the Rayleigh–Mie–Raman lidar operated at the Arctic Lidar Observatory for Middle Atmosphere Research (ALOMAR) in northern Norway. The retrievals are based on a two-step approach. In a first step, the median radius of an assumed monomodal log-normal particle size distribution with fixed width is retrieved based on a color index that formed from the measured backscatter ratios at the wavelengths of 1064 nm and 532 nm. An intrinsic ambiguity of the retrieved aerosol size information is discussed. In a second step, this particle size information is used to convert the measured lidar backscatter ratio to aerosol extinction coefficients. The retrieval is currently based on monthly-averaged lidar measurements and the results for March 2013 are discussed. A sensitivity study is presented that allows for establishing an error budget for the aerosol retrievals. Assuming a monomodal log-normal aerosol particle size distribution with a geometric width of S = 1.5, median radii on the order of below 100 nm are retrieved. The median radii are found to generally decrease with increasing altitude. The retrieved aerosol extinction profiles are compared to observations with the OSIRIS (Optical Spectrograph and InfraRed Imager System) and the OMPS-LP (Ozone Mapping Profiling Suite Limb Profiler) satellite instruments in the 60 ${}^{\circ }$ N to 80 ${}^{\circ }$ N latitude band. The extinction profiles that were retrieved from the lidar measurements show good agreement with the observations of the two satellite instruments when taking the different wavelengths of the instruments into account.

中文翻译：

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一种从地面瑞利-米-拉曼激光雷达观测资料中提取平流层气溶胶消光和粒径的方法

我们报告了由挪威北部北极激光雷达中空研究站（ALOMAR）运营的Rayleigh-Mie-Raman激光雷达通过多色反向散射测量获得的平流层气溶胶粒径和消光系数分布图。检索基于两步方法。第一步，根据颜色指数检索假定的具有固定宽度的单峰对数正态粒度分布的中值半径，该颜色指数由在1064 nm和532 nm波长处测得的反向散射比形成。讨论了所获取的气溶胶尺寸信息的内在模糊性。在第二步骤中，此粒度信息用于将测得的激光雷达后向散射比转换为气溶胶消光系数。目前，该检索基于月平均激光雷达测量值，并讨论了2013年3月的结果。提出了一项敏感性研究，可以为气溶胶回收建立误差预算。假设几何宽度为的单峰对数正态气溶胶粒径分布S = 1.5，检索到低于100 nm的中值半径。发现中值半径通常随高度的增加而减小。将获得的气溶胶消光剖面与OSIRIS（光学光谱仪和红外成像仪系统）和OMPS-LP（臭氧测绘分析套件肢体轮廓仪）在60年代的观测值进行比较。 ${}^{\circ }$ N至80 ${}^{\circ }$ N纬度带。当考虑到仪器的不同波长时，从激光雷达测量结果中获得的消光剖面与这两个卫星仪器的观测结果显示出很好的一致性。