French airborne lidar measurements for Eyjafjallajökull ash plume survey
French airborne lidar measurements for Eyjafjallajökull ash plume survey
复制标题
法国机载激光雷达测量埃亚菲亚德拉冰盖火山灰羽流调查
DOI：
10.5194/acp-12-7059-2012
复制
发表时间：
2012
影响因子：
6.3
通讯作者：
P. Royer
中科院分区：
文献类型：
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作者：
P. Chazette;A. Dabas;J. Sanak;M. Lardier;P. Royer
抽象的。法国研究飞机Falcon 20上安装了一台紫外瑞利-米氏激光雷达，以监测2010年4月至5月埃亚菲亚德拉火山喷出的火山灰羽。2010年4月21日、5月12日和16日分别在法国、西班牙和英国领空进行了三次业务飞行。飞行的最初目的是向法国民航当局提供关于火山灰羽流的存在和位置的客观信息。本文件介绍了火山危机后详细分析的结果。它们与火山灰云的结构及其光学特性（如消光系数和激光雷达比）有关。测得的激光雷达比率在43至50 sr的范围内，与2010年4月从巴黎（法国）附近的地基激光雷达获得的比率（~48 sr）非常一致。在所有飞行期间，颗粒去极化方面的灰特征是一致的（在34 ± 3%和38 ± 3%之间）。这样的值似乎是火山灰的一个很好的识别参数。使用0.19和1.1 m2 g−1之间的特定横截面，5月12日和16日飞行得出的灰羽中的最小（最大）质量浓度分别为140（2300）和250（1500）μg m−3。它可能比飞机发动机的临界损伤水平（2 mg m−3）要低，或处于临界损伤水平的量级，但远高于200 μg m−3的警戒水平。
Abstract. An Ultra-Violet Rayleigh-Mie lidar has been integrated aboard the French research aircraft Falcon20 in order to monitor the ash plume emitted by the Eyjafjallajokul volcano in April–May 2010. Three operational flights were carried out on 21 April, 12 and 16 May 2010 inside French, Spanish and British air spaces, respectively. The original purpose of the flights was to provide the French civil aviation authorities with objective information on the presence and location of the ash plume. The present paper presents the results of detailed analyses elaborated after the volcano crisis. They bear on the structure of the ash clouds and their optical properties such as the extinction coefficient and the lidar ratio. Lidar ratios were measured in the range of 43 to 50 sr, in good agreement with the ratios derived from ground-based lidar near Paris (France) in April 2010 (~48 sr). The ash signature in terms of particulate depolarization was consistent during all flights (between 34 ± 3 % and 38 ± 3%). Such a value seems to be a good identification parameter for volcanic ash. Using specific cross-sections between 0.19 and 1.1 m2 g−1, the minimum (maximal) mass concentrations in the ash plumes derived for the flights on 12 and 16 May were 140 (2300) and 250 (1500) μg m−3, respectively. It may be rather less than, or of the order of the critical level of damage (2 mg m−3) for the aircraft engines, but well above the 200 μg m−3 warning level.
2010 年埃亚菲亚德拉冰盖火山灰羽流的机载激光雷达观测
影响因子：
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作者：
Marenco F
通讯作者：
Marenco F
影响因子：
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作者：
B. Johnson;K. Turnbull;P. Brown;R. Burgess;J. Dorsey;A. Baran;H. Webster;J. Haywood;R. Cotton;Z. Ulanowski;E. Hesse;A. Woolley;P. Rosenberg;Metals Office
通讯作者：
B. Johnson;K. Turnbull;P. Brown;R. Burgess;J. Dorsey;A. Baran;H. Webster;J. Haywood;R. Cotton;Z. Ulanowski;E. Hesse;A. Woolley;P. Rosenberg;Metals Office