Establishing Lagrangian connections between observations within air masses crossing the Atlantic during the International Consortium for Atmospheric Research on Transport and Transformation experiment

J. Methven, S. R. Arnold, Andreas Stohl, M. J. Evans, M. Avery, K. Law, A. C. Lewis, P. S. Monks, D. D. Parrish, C. E. Reeves, H. Schlager, Elliot L Atlas, D. R. Blake, H. Coe, J. Crosier, Frank M. Flocke, John S. Holloway, J. R. Hopkins, J. McQuaid, R. Purvis & 5 others B. Rappenglück, H. B. Singh, N. M. Watson, L. K. Whalley, P. I. Williams

Research output: Contribution to journalArticle

40 Citations (Scopus)

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.

Original languageEnglish (US)
Article numberD23S62
JournalJournal of Geophysical Research C: Oceans
Volume111
Issue number23
DOIs
StatePublished - Dec 16 2006

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air masses
air mass
Hydrocarbons
hydrocarbon
aircraft
Air
tracer
trajectory
hydrocarbons
experiment
Experiments
Trajectories
Aircraft
photochemistry
tracers
Troposphere
trajectories
Photochemical reactions
troposphere
Azores

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Atmospheric Science
  • Astronomy and Astrophysics
  • Oceanography

Cite this

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.; Arnold, S. R.; Stohl, Andreas; Evans, M. J.; Avery, M.; Law, K.; Lewis, A. C.; Monks, P. S.; Parrish, D. D.; Reeves, C. E.; Schlager, H.; Atlas, Elliot L; Blake, D. R.; Coe, H.; Crosier, J.; Flocke, Frank M.; Holloway, John S.; Hopkins, J. R.; McQuaid, J.; Purvis, R.; Rappenglück, B.; Singh, H. B.; Watson, N. M.; Whalley, L. K.; Williams, P. I.

In: Journal of Geophysical Research C: Oceans, Vol. 111, No. 23, D23S62, 16.12.2006.

Research output: Contribution to journalArticle

Methven, J, Arnold, SR, Stohl, A, Evans, MJ, Avery, M, Law, K, Lewis, AC, Monks, PS, Parrish, DD, Reeves, CE, Schlager, H, Atlas, EL, Blake, DR, Coe, H, Crosier, J, Flocke, FM, Holloway, JS, Hopkins, JR, McQuaid, J, Purvis, R, Rappenglück, B, Singh, HB, Watson, NM, Whalley, LK & Williams, PI 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 C: Oceans, vol. 111, no. 23, D23S62. https://doi.org/10.1029/2006JD007540
Methven, J. ; Arnold, S. R. ; Stohl, Andreas ; Evans, M. J. ; Avery, M. ; Law, K. ; Lewis, A. C. ; Monks, P. S. ; Parrish, D. D. ; Reeves, C. E. ; Schlager, H. ; Atlas, Elliot L ; Blake, D. R. ; Coe, H. ; Crosier, J. ; Flocke, Frank M. ; Holloway, John S. ; Hopkins, J. R. ; McQuaid, J. ; Purvis, R. ; Rappenglück, B. ; Singh, H. B. ; Watson, N. M. ; Whalley, L. K. ; Williams, P. I. / Establishing Lagrangian connections between observations within air masses crossing the Atlantic during the International Consortium for Atmospheric Research on Transport and Transformation experiment. In: Journal of Geophysical Research C: Oceans. 2006 ; Vol. 111, No. 23.
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