Establishing Lagrangian connections between observations within air masses crossing the Atlantic during the International Consortium for Atmospheric Research on Transport and Transformation experiment
Methven, J. and Arnold, S. R. and Stohl, A. and Evans, M. J. and Avery, M. and Law, K. and Lewis, A.C. and Monks, P.S. and Parrish, D.D. and Reeves, C.E. and Schlager, H. and Atlas, E. and Blake, D.R. and Coe, H. and Crosier, J. and Flocke, F.M. and Holloway, J.S. and Hopkins, J.R. and McQuaid, J. and Purvis, R. and Rappenglück, B. and Singh, H.B. and Watson, N.M. and Whalley, L.K. and Williams, P.I. (2006) Establishing Lagrangian connections between observations within air masses crossing the Atlantic during the International Consortium for Atmospheric Research on Transport and Transformation experiment. Journal of Geophysical Research, 111, . DOI: 10.1029/2006JD007540.
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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.
|Title:||Establishing Lagrangian connections between observations within air masses crossing the Atlantic during the International Consortium for Atmospheric Research on Transport and Transformation experiment|
|Journal or Publication Title:||Journal of Geophysical Research|
|In ISI Web of Science:||Yes|
|Keywords:||long range transport, Lagrangian experiment, pollution transport, trajectory match, fingerprint, air mass transformation|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Transport|
|HGF - Program Themes:||V UR - Schonung von Umwelt und Ressourcen|
|DLR - Research area:||Transport|
|DLR - Program:||V UR - Schonung von Umwelt und Ressourcen|
|DLR - Research theme (Project):||V - Umweltwirkungen des Verkehrs (old)|
|Institutes and Institutions:||Institute of Atmospheric Physics > Atmospheric Trace Species|
|Deposited By:||Jana Freund|
|Deposited On:||05 Feb 2007|
|Last Modified:||27 Apr 2009 13:20|
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