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Establishing Lagrangian Connections between Observations within Air Masses Crossing the Atlantic during the ICARTT ExperimentThe International Consortium for Atmospheric Research on Transport and Transformation (ICARTT)-Lagrangian 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 using two Lagrangian models that were used to direct the aircraft into target air masses. A novel technique is then used to identify 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.
Document ID
20080015925
Acquisition Source
Langley Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Methven, J. (Reading Univ. United Kingdom)
Arnold, S. R. (Leeds Univ. United Kingdom)
Stohl, A. (Norwegian Inst. for Air Research Kjeller, Norway)
Evans, M. J. (Leeds Univ. United Kingdom)
Avery, M. (NASA Langley Research Center Hampton, VA, United States)
Law, K. (Centre National de la Recherche Scientifique Paris, France)
Lewis, A. C. (York Univ. United Kingdom)
Monks, P. S. (Leicester Univ. United Kingdom)
Parrish, D. (National Oceanic and Atmospheric Administration Boulder, CO, United States)
Reeves, C. (East Anglia Univ. Norwich, United Kingdom)
Schlager, H. (Deutsche Forschungsanstalt fuer Luft- und Raumfahrt Oberpfaffenhofen, Germany)
Atlas, E. (Miami Univ. Miami, FL, United States)
Blake, D. (California Univ. CA, United States)
Coe, H. (Manchester Univ. United Kingdom)
Cohen, R. C. (California Univ. CA, United States)
Crosier, J. (Manchester Univ. United Kingdom)
Flocke, F. (National Center for Atmospheric Research Boulder, CO, United States)
Holloway, J. S. (National Oceanic and Atmospheric Administration Boulder, CO, United States)
Hopkins, J. R. (York Univ. United Kingdom)
Huber, G. (National Oceanic and Atmospheric Administration Boulder, CO, United States)
McQuaid, J. (Leeds Univ. United Kingdom)
Purvis, R. (Facility for Airborne Atmospheric Measurements Cranfield, United Kingdom)
Rappengluck, B. (Forschungszentrum Karlsruhe G.m.b.H. Karlsruhe, Germany)
Ryerson, T. B. (National Oceanic and Atmospheric Administration Boulder, CO, United States)
Sachse, G. W. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 24, 2013
Publication Date
December 1, 2006
Subject Category
Geosciences (General)
Funding Number(s)
WBS: WBS 281945.02.39.01.04
Distribution Limits
Public
Copyright
Public Use Permitted.

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