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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, D23S62. DOI: 10.1029/2006JD007540.

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Abstract

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.

Document Type:Article
Title:Establishing Lagrangian connections between observations within air masses crossing the Atlantic during the International Consortium for Atmospheric Research on Transport and Transformation experiment
Authors:
AuthorsInstitution or Email of Authors
Methven, J.Univ. of Reading, Reading, UK
Arnold, S. R.Univ. of Leeds, Leeds, UK
Stohl, A.NILU, Kjeller, N
Evans, M. J.Univ. of Leeds, Leeds, UK
Avery, M.NASA, Hampton, VA, USA
Law, K.Univ. Pierre et Marie Curie, Paris, F
Lewis, A.C.Univ. of York, York, UK
Monks, P.S.Univ. of Leicester, Leicester, UK
Parrish, D.D.NOAA, Boulder, CO, USA
Reeves, C.E.Univ. of East Angli, Norwich, UK
Schlager, H.UNSPECIFIED
Atlas, E.Univ. of Miami, Miami, FL, USA
Blake, D.R.Univ. of California, Irvine, CA, USA
Coe, H.Univ. of Manchester, Manchester, UK
Crosier, J.Univ. of Manchester, Manchester, UK
Flocke, F.M.NCAR, Boulder, CO, USA
Holloway, J.S.NOAA, Boulder, CO, USA
Hopkins, J.R.Univ. of York, York, UK
McQuaid, J.Univ. of Leeds, Leeds, UK
Purvis, R.FAAM, Cranfield, UK
Rappenglück, B.FZ Karlsruhe, Garmisch-Partenkirchen
Singh, H.B.NASA, Moffett Field, CA, USA
Watson, N.M.Univ. of York, York, UK
Whalley, L.K.Univ. of Leeds, Leeds, UK
Williams, P.I.Univ. of Manchester, Manchester, UK
Date:2006
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:111
DOI:10.1029/2006JD007540
Page Range:D23S62
Status:Published
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 (old)
DLR - Research area:Transport
DLR - Program:V UR - Schonung von Umwelt und Ressourcen
DLR - Research theme (Project):V - Umweltwirkungen des Verkehrs (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Jana Freund
Deposited On:05 Feb 2007
Last Modified:11 Nov 2014 21:56

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