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Lagrangian analysis of low level anthropogenic plume processing across the North Atlantic

Real, E. and Law, K. and Schlager, H. and Roiger, A. and Huntrieser, H. and Methven, J. and Cain, M. and Holloway, J. and Neuman, J.A. and Ryerson, T. and Flocke, F. and de Gouw, J. and Atlas, E. and Donnelly, S. and Parrish, D. (2008) Lagrangian analysis of low level anthropogenic plume processing across the North Atlantic. Atmospheric Chemistry and Physics, 8, pp. 7737-7754.

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Abstract

The photochemical evolution of an anthropogenic plume from the New-York/Boston region during its transport at low altitudes over the North Atlantic to the European west coast has been studied using a Lagrangian framework. This plume, originally strongly polluted, was sampled by research aircraft just off the North American east coast on 3 successive days, and 3 days downwind off the west coast of Ireland where another aircraft re-sampled a weakly polluted plume. Changes in trace gas concentrations during transport were reproduced using a photochemical trajectory model including deposition and mixing effects. Chemical and wet deposition processing dominated the evolution of all pollutants in the plume. The mean net O3 production was evaluated to be -5 ppbv/day leading to low values of O3 by the time the plume reached Europe. Wet deposition of nitric acid was responsible for an 80% reduction in this O3 production. If the plume had not encountered precipitation, it would have reached the Europe with O3 levels up to 80-90 ppbv, and CO levels between 120 and 140 ppbv. Photochemical destruction also played a more important role than mixing in the evolution of plume CO due to high levels of both O3 and water vapour showing that CO cannot always be used as a tracer for polluted air masses, especially for plumes transported at low altitudes. The results also show that, in this case, an important increase in the O3/CO slope can be attributed to chemical destruction of CO and not to photochemical O3 production as is often assumed.

Document Type:Article
Title:Lagrangian analysis of low level anthropogenic plume processing across the North Atlantic
Authors:
AuthorsInstitution or Email of Authors
Real, E.Service d'Aéronomie, Paris, F
Law, K.Service d'Aéronomie, Paris, F
Schlager, H.DLR
Roiger, A.DLR
Huntrieser, H.DLR
Methven, J.Univ. of Reading, Reading, UK
Cain, M.Univ. of Reading, Reading, UK
Holloway, J.Univ. of Colorado at Boulder, Boulder, CO, USA
Neuman, J.A.Univ. of Colorado at Boulder, Boulder, CO, USA
Ryerson, T.NOAA ESRL, Boulder, CO, USA
Flocke, F.NCAR, Boulder, CO, USA
de Gouw, J.Univ. of Colorado at Boulder, Boulder, CO, USA
Atlas, E.Univ. of Miami, Miami, USA
Donnelly, S.Fort Hays State Univ., Hays, KS, USA
Parrish, D.NOAA ESRL, Boulder, CO, USA
Date:2008
Journal or Publication Title:Atmospheric Chemistry and Physics
Volume:8
Page Range:pp. 7737-7754
Status:Published
Keywords:pollution plume, ozone production, photochemical modeling
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Air Traffic and Weather (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Dr.rer.nat. Heidi Huntrieser
Deposited On:07 Jan 2009
Last Modified:12 Dec 2013 20:31

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