New approach for aerosol profiling with a Lidar onhoard an ultralight aircraft: Application to the African Monsoon Multidisciplinary Analysis
New approach for aerosol profiling with a Lidar onhoard an ultralight aircraft: Application to the African Monsoon Multidisciplinary Analysis
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DOI：
10.1021/es070343y
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发表时间：
2007-12-15
影响因子：
11.4
通讯作者：
Dulac, Francois
中科院分区：
文献类型：
--
作者：
Chazette, Patrick;Sanak, Joseph;Dulac, Francois
设计了一种用于超轻型飞机的新型机载仪器载荷，用于确定气溶胶光学特性的垂直剖面。它是基于激光雷达气溶胶紫外光机场（LAUVA），一个紧凑的后向散射激光雷达系统，发射波长为355nm。2006年1月至2月，在非洲季风多学科分析（AMMA）的第一次活动期间，我们从尼日尔的尼亚美市在萨赫勒地区操作了这种机载配置，当时来自土壤尘埃和草原火灾的气溶胶导致能见度大幅降低。利用激光雷达指向不同方向的能力，反演了气溶胶后向散射消光比（BER）的垂直剖面。与散射计（880nm）和地面太阳光度计的协同作用使我们能够进一步确定埃氏指数的垂直剖面(A)。我们在自由对流层以下约5公里处确定了三种类型的气溶胶层，分别以生物质燃烧（BB）颗粒、矿物粉尘(D)颗粒和BB和D颗粒混合为主，其BER (a)值分别接近0.008 sr(-1)（1.5）、0.025 sr(-1)(0)和0.015 sr(-1)（0.4 -1）。
A new airborne instrumental payload has been designed for an ultralight aircraft to determine the vertical profile of aerosol optical properties. It is based on Lidar Aerosols UItraViolet Aeroporte (LAUVA), a compact backscattering lidar system emitting at the wavelength of 355 nm. We operated this airborne configuration in the Sahel from the city of Niamey (Niger) during the first campaign of the African Monsoon Multidisciplinary Analysis (AMMA) in January - February 2006, when aerosols from both soil dust and savannah fires cause large visibility reductions. We take advantage of the lidar capability of pointing in different directions for retrieving the vertical profile of the aerosol backscatter to extinction ratio (BER). A synergy with a scatterometer (880 nm) and a ground-based sunphotometer allows us to further determine the vertical profile of Angstrom exponent (a). We identify three types of aerosol layers up to about 5 km below the free troposphere, dominated by biomass burning (BB) particles, mineral dust (D) particles, and a mixing between BB and D particles, respectively, associated with BER (a) values close to 0.008 sr(-1) (1.5), 0.025 sr(-1) (0), and 0.015 sr(-1) (0.4 - 1).