Establishing Lagrangian connections between observations within air masses crossing the Atlantic during the International Consortium for Atmospheric Research on Transport and Transformation experiment
Establishing Lagrangian connections between observations within air masses crossing the Atlantic during the International Consortium for Atmospheric Research on Transport and Transformation experiment
复制标题
在国际大气研究联盟传输与转化实验期间，在穿越大西洋的气团内的观测结果之间建立拉格朗日联系
DOI：
10.1029/2006jd007540
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
L. Whalley
中科院分区：
文献类型：
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作者：
J. Methven;Arnold;M. J. Evans;J. McQuaid;A. Stohl;M. Avery;K. Law;A. Lewis;Hopkins;N. Watson;P. Monks;D. Parrish;J. Holloway;C. Reeves;H. Schlager;E. Atlas;Blake;H. Coe;J. Crosier;P. Williams;F. Flocke;R. Purvis;B. Rappenglück;H. Singh;L. Whalley
ITCT-Lagrangian-2K 4（洲际传输和化学转化）实验的目的是量化光化学和混合对自由对流层中空气质量转化的影响。为此目的，在这些气团飞越北大西洋的过程中，曾数次试图利用分别位于新罕布什尔州（美国）、法亚尔（亚速尔群岛）和克雷尔（法国）的四架飞机进行拦截和取样。本文首先描述了两个拉格朗日模型的预测，用于指导飞机进入目标气团。一种新的技术，然后确定飞行段之间的拉格朗日匹配。两个独立的搜索进行：拉格朗日模型匹配和匹配的碳氢化合物指纹的对整个空气样本。通过搜索由匹配轨迹链接的匹配碳氢化合物样本来进一步过滤信息。这些“重合匹配”的质量是使用温度、湿度和示踪观测来评估的。该技术拉出五个明确的拉格朗日案件涵盖了各种情况下，这些都进行了详细研究。匹配轨迹和碳氢化合物指纹显示，并在示踪剂的顺风减去逆风的差异进行了讨论。
The ITCT-Lagrangian-2K4 (Intercontinental Transport and Chemical Transformation) experiment was conceived with an aim to quantify the effects of photochemistry and mixing on the transformation of air masses in the free troposphere away from emissions. To this end, attempts were made to intercept and sample air masses several times during their journey across the North Atlantic using four aircraft based in New Hampshire (USA), Faial (Azores) and Creil (France). This article begins by describing forecasts from two Lagrangian models that were used to direct the aircraft into target air masses. A novel technique then identifies Lagrangian matches between flight segments. Two independent searches are conducted: for Lagrangian model matches and for pairs of whole air samples with matching hydrocarbon fingerprints. The information is filtered further by searching for matching hydrocarbon samples that are linked by matching trajectories. The quality of these "coincident matches'' is assessed using temperature, humidity and tracer observations. The technique pulls out five clear Lagrangian cases covering a variety of situations and these are examined in detail. The matching trajectories and hydrocarbon fingerprints are shown, and the downwind minus upwind differences in tracers are discussed.