Processes influencing ozone levels in Alaskan forest fire plumes during long-range transport over the North Atlantic
[1] A case of long-range transport of a biomass burning plume from Alaska to Europe is analyzed using a Lagrangian approach. This plume was sampled several times in the free troposphere over North America, the North Atlantic and Europe by three different aircraft during the IGAC Lagrangian 2K4 exper...
Published in: | Journal of Geophysical Research: Atmospheres |
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Online Access: | https://eprints.lancs.ac.uk/id/eprint/49575/ https://eprints.lancs.ac.uk/id/eprint/49575/1/2006JD007576.pdf |
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ftulancaster:oai:eprints.lancs.ac.uk:49575 2024-05-19T07:45:01+00:00 Processes influencing ozone levels in Alaskan forest fire plumes during long-range transport over the North Atlantic Real, E. Law, K. S. Weinzierl, B. Fiebig, M. Petzold, A. Wild, O. Methven, J. Arnold, S. Stohl, A. Huntrieser, H. Roiger, A. Schlager, H. Stewart, D. Avery, M. Sachse, G. Browell, E. Ferrare, R. Blake, D. 2007-05-08 application/pdf https://eprints.lancs.ac.uk/id/eprint/49575/ https://eprints.lancs.ac.uk/id/eprint/49575/1/2006JD007576.pdf en eng https://eprints.lancs.ac.uk/id/eprint/49575/1/2006JD007576.pdf Real, E. and Law, K. S. and Weinzierl, B. and Fiebig, M. and Petzold, A. and Wild, O. and Methven, J. and Arnold, S. and Stohl, A. and Huntrieser, H. and Roiger, A. and Schlager, H. and Stewart, D. and Avery, M. and Sachse, G. and Browell, E. and Ferrare, R. and Blake, D. (2007) Processes influencing ozone levels in Alaskan forest fire plumes during long-range transport over the North Atlantic. Journal of Geophysical Research: Atmospheres, 112 (D10): D10S41. -. ISSN 0747-7309 Journal Article PeerReviewed 2007 ftulancaster 2024-04-30T23:33:17Z [1] A case of long-range transport of a biomass burning plume from Alaska to Europe is analyzed using a Lagrangian approach. This plume was sampled several times in the free troposphere over North America, the North Atlantic and Europe by three different aircraft during the IGAC Lagrangian 2K4 experiment which was part of the ICARTT/ ITOP measurement intensive in summer 2004. Measurements in the plume showed enhanced values of CO, VOCs and NOy, mainly in form of PAN. Observed O-3 levels increased by 17 ppbv over 5 days. A photochemical trajectory model, CiTTyCAT, was used to examine processes responsible for the chemical evolution of the plume. The model was initialized with upwind data and compared with downwind measurements. The influence of high aerosol loading on photolysis rates in the plume was investigated using in situ aerosol measurements in the plume and lidar retrievals of optical depth as input into a photolysis code (Fast-J), run in the model. Significant impacts on photochemistry are found with a decrease of 18% in O-3 production and 24% in O-3 destruction over 5 days when including aerosols. The plume is found to be chemically active with large O-3 increases attributed primarily to PAN decomposition during descent of the plume toward Europe. The predicted O-3 changes are very dependent on temperature changes during transport and also on water vapor levels in the lower troposphere which can lead to O-3 destruction. Simulation of mixing/dilution was necessary to reproduce observed pollutant levels in the plume. Mixing was simulated using background concentrations from measurements in air masses in close proximity to the plume, and mixing timescales ( averaging 6.25 days) were derived from CO changes. Observed and simulated O-3/CO correlations in the plume were also compared in order to evaluate the photochemistry in the model. Observed slopes change from negative to positive over 5 days. This change, which can be attributed largely to photochemistry, is well reproduced by multiple model runs even if ... Article in Journal/Newspaper North Atlantic Alaska Lancaster University: Lancaster Eprints Journal of Geophysical Research: Atmospheres 112 D10 |
institution |
Open Polar |
collection |
Lancaster University: Lancaster Eprints |
op_collection_id |
ftulancaster |
language |
English |
description |
[1] A case of long-range transport of a biomass burning plume from Alaska to Europe is analyzed using a Lagrangian approach. This plume was sampled several times in the free troposphere over North America, the North Atlantic and Europe by three different aircraft during the IGAC Lagrangian 2K4 experiment which was part of the ICARTT/ ITOP measurement intensive in summer 2004. Measurements in the plume showed enhanced values of CO, VOCs and NOy, mainly in form of PAN. Observed O-3 levels increased by 17 ppbv over 5 days. A photochemical trajectory model, CiTTyCAT, was used to examine processes responsible for the chemical evolution of the plume. The model was initialized with upwind data and compared with downwind measurements. The influence of high aerosol loading on photolysis rates in the plume was investigated using in situ aerosol measurements in the plume and lidar retrievals of optical depth as input into a photolysis code (Fast-J), run in the model. Significant impacts on photochemistry are found with a decrease of 18% in O-3 production and 24% in O-3 destruction over 5 days when including aerosols. The plume is found to be chemically active with large O-3 increases attributed primarily to PAN decomposition during descent of the plume toward Europe. The predicted O-3 changes are very dependent on temperature changes during transport and also on water vapor levels in the lower troposphere which can lead to O-3 destruction. Simulation of mixing/dilution was necessary to reproduce observed pollutant levels in the plume. Mixing was simulated using background concentrations from measurements in air masses in close proximity to the plume, and mixing timescales ( averaging 6.25 days) were derived from CO changes. Observed and simulated O-3/CO correlations in the plume were also compared in order to evaluate the photochemistry in the model. Observed slopes change from negative to positive over 5 days. This change, which can be attributed largely to photochemistry, is well reproduced by multiple model runs even if ... |
format |
Article in Journal/Newspaper |
author |
Real, E. Law, K. S. Weinzierl, B. Fiebig, M. Petzold, A. Wild, O. Methven, J. Arnold, S. Stohl, A. Huntrieser, H. Roiger, A. Schlager, H. Stewart, D. Avery, M. Sachse, G. Browell, E. Ferrare, R. Blake, D. |
spellingShingle |
Real, E. Law, K. S. Weinzierl, B. Fiebig, M. Petzold, A. Wild, O. Methven, J. Arnold, S. Stohl, A. Huntrieser, H. Roiger, A. Schlager, H. Stewart, D. Avery, M. Sachse, G. Browell, E. Ferrare, R. Blake, D. Processes influencing ozone levels in Alaskan forest fire plumes during long-range transport over the North Atlantic |
author_facet |
Real, E. Law, K. S. Weinzierl, B. Fiebig, M. Petzold, A. Wild, O. Methven, J. Arnold, S. Stohl, A. Huntrieser, H. Roiger, A. Schlager, H. Stewart, D. Avery, M. Sachse, G. Browell, E. Ferrare, R. Blake, D. |
author_sort |
Real, E. |
title |
Processes influencing ozone levels in Alaskan forest fire plumes during long-range transport over the North Atlantic |
title_short |
Processes influencing ozone levels in Alaskan forest fire plumes during long-range transport over the North Atlantic |
title_full |
Processes influencing ozone levels in Alaskan forest fire plumes during long-range transport over the North Atlantic |
title_fullStr |
Processes influencing ozone levels in Alaskan forest fire plumes during long-range transport over the North Atlantic |
title_full_unstemmed |
Processes influencing ozone levels in Alaskan forest fire plumes during long-range transport over the North Atlantic |
title_sort |
processes influencing ozone levels in alaskan forest fire plumes during long-range transport over the north atlantic |
publishDate |
2007 |
url |
https://eprints.lancs.ac.uk/id/eprint/49575/ https://eprints.lancs.ac.uk/id/eprint/49575/1/2006JD007576.pdf |
genre |
North Atlantic Alaska |
genre_facet |
North Atlantic Alaska |
op_relation |
https://eprints.lancs.ac.uk/id/eprint/49575/1/2006JD007576.pdf Real, E. and Law, K. S. and Weinzierl, B. and Fiebig, M. and Petzold, A. and Wild, O. and Methven, J. and Arnold, S. and Stohl, A. and Huntrieser, H. and Roiger, A. and Schlager, H. and Stewart, D. and Avery, M. and Sachse, G. and Browell, E. and Ferrare, R. and Blake, D. (2007) Processes influencing ozone levels in Alaskan forest fire plumes during long-range transport over the North Atlantic. Journal of Geophysical Research: Atmospheres, 112 (D10): D10S41. -. ISSN 0747-7309 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
112 |
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D10 |
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1799484932281597952 |