Trace gas transport in the 1999/2000 Arctic winter: comparison of nudged GCM runs with observations
International audience We have compared satellite and balloon observations of methane (CH 4 ) and hydrogen fluoride (HF) during the Arctic winter 1999/2000 with results from the MA-ECHAM4 middle atmospheric general circulation model (GCM). For this purpose, the meteorology in the model was nudged to...
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Online Access: | https://hal.science/hal-00295386 https://hal.science/hal-00295386/document https://hal.science/hal-00295386/file/acp-4-81-2004.pdf |
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ftccsdartic:oai:HAL:hal-00295386v1 2023-12-03T10:16:56+01:00 Trace gas transport in the 1999/2000 Arctic winter: comparison of nudged GCM runs with observations van Aalst, M. K. van den Broek, M. M. P. Bregman, A. Brühl, C. Steil, B. Toon, G. C. Garcelon, S. Hansford, G. M. Jones, R. L. Gardiner, T. D. Roelofs, G. J. Lelieveld, J. Crutzen, P.J. Institute for Marine and Atmospheric Research Utrecht (IMAU) Universiteit Utrecht / Utrecht University Utrecht SRON Netherlands Institute for Space Research (SRON) Royal Netherlands Meteorological Institute (KNMI) Max-Planck-Institut für Chemie (MPIC) Max-Planck-Gesellschaft Jet Propulsion Laboratory (JPL) NASA-California Institute of Technology (CALTECH) University of Cambridge UK (CAM) National Physical Laboratory Teddington (NPL) 2004-01-23 https://hal.science/hal-00295386 https://hal.science/hal-00295386/document https://hal.science/hal-00295386/file/acp-4-81-2004.pdf en eng HAL CCSD European Geosciences Union hal-00295386 https://hal.science/hal-00295386 https://hal.science/hal-00295386/document https://hal.science/hal-00295386/file/acp-4-81-2004.pdf info:eu-repo/semantics/OpenAccess ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.science/hal-00295386 Atmospheric Chemistry and Physics, 2004, 4 (1), pp.81-93 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2004 ftccsdartic 2023-11-04T23:56:03Z International audience We have compared satellite and balloon observations of methane (CH 4 ) and hydrogen fluoride (HF) during the Arctic winter 1999/2000 with results from the MA-ECHAM4 middle atmospheric general circulation model (GCM). For this purpose, the meteorology in the model was nudged towards ECMWF analyses. This nudging technique is shown to work well for this middle atmospheric model, and offers good opportunities for the simulation of chemistry and transport processes. However, caution must be used inside the polar vortex, particularly late in the winter. The current study focuses on transport of HF and CH 4 , initialized with satellite measurements from the HALOE instrument aboard the UARS satellite. We have compared the model results with HALOE data and balloon measurements throughout the winter, and analyzed the uncertainties associated with tracer initialization, boundary conditions and the passive tracer assumption. This comparison shows that the model represents some aspects of the Arctic vortex well, including relatively small-scale features. However, while profiles outside the vortex match observations well, the model underestimates HF and overestimates CH 4 concentrations inside the vortex, particularly in the middle stratosphere. This problem is also evident in a comparison of vortex descent rates based upon vortex average tracer profiles from MA-ECHAM4, and various observations. This could be due to an underestimate of diabatic subsidence in the model, or due to too much mixing between vortex and non-vortex air. Article in Journal/Newspaper Arctic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere van Aalst, M. K. van den Broek, M. M. P. Bregman, A. Brühl, C. Steil, B. Toon, G. C. Garcelon, S. Hansford, G. M. Jones, R. L. Gardiner, T. D. Roelofs, G. J. Lelieveld, J. Crutzen, P.J. Trace gas transport in the 1999/2000 Arctic winter: comparison of nudged GCM runs with observations |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience We have compared satellite and balloon observations of methane (CH 4 ) and hydrogen fluoride (HF) during the Arctic winter 1999/2000 with results from the MA-ECHAM4 middle atmospheric general circulation model (GCM). For this purpose, the meteorology in the model was nudged towards ECMWF analyses. This nudging technique is shown to work well for this middle atmospheric model, and offers good opportunities for the simulation of chemistry and transport processes. However, caution must be used inside the polar vortex, particularly late in the winter. The current study focuses on transport of HF and CH 4 , initialized with satellite measurements from the HALOE instrument aboard the UARS satellite. We have compared the model results with HALOE data and balloon measurements throughout the winter, and analyzed the uncertainties associated with tracer initialization, boundary conditions and the passive tracer assumption. This comparison shows that the model represents some aspects of the Arctic vortex well, including relatively small-scale features. However, while profiles outside the vortex match observations well, the model underestimates HF and overestimates CH 4 concentrations inside the vortex, particularly in the middle stratosphere. This problem is also evident in a comparison of vortex descent rates based upon vortex average tracer profiles from MA-ECHAM4, and various observations. This could be due to an underestimate of diabatic subsidence in the model, or due to too much mixing between vortex and non-vortex air. |
author2 |
Institute for Marine and Atmospheric Research Utrecht (IMAU) Universiteit Utrecht / Utrecht University Utrecht SRON Netherlands Institute for Space Research (SRON) Royal Netherlands Meteorological Institute (KNMI) Max-Planck-Institut für Chemie (MPIC) Max-Planck-Gesellschaft Jet Propulsion Laboratory (JPL) NASA-California Institute of Technology (CALTECH) University of Cambridge UK (CAM) National Physical Laboratory Teddington (NPL) |
format |
Article in Journal/Newspaper |
author |
van Aalst, M. K. van den Broek, M. M. P. Bregman, A. Brühl, C. Steil, B. Toon, G. C. Garcelon, S. Hansford, G. M. Jones, R. L. Gardiner, T. D. Roelofs, G. J. Lelieveld, J. Crutzen, P.J. |
author_facet |
van Aalst, M. K. van den Broek, M. M. P. Bregman, A. Brühl, C. Steil, B. Toon, G. C. Garcelon, S. Hansford, G. M. Jones, R. L. Gardiner, T. D. Roelofs, G. J. Lelieveld, J. Crutzen, P.J. |
author_sort |
van Aalst, M. K. |
title |
Trace gas transport in the 1999/2000 Arctic winter: comparison of nudged GCM runs with observations |
title_short |
Trace gas transport in the 1999/2000 Arctic winter: comparison of nudged GCM runs with observations |
title_full |
Trace gas transport in the 1999/2000 Arctic winter: comparison of nudged GCM runs with observations |
title_fullStr |
Trace gas transport in the 1999/2000 Arctic winter: comparison of nudged GCM runs with observations |
title_full_unstemmed |
Trace gas transport in the 1999/2000 Arctic winter: comparison of nudged GCM runs with observations |
title_sort |
trace gas transport in the 1999/2000 arctic winter: comparison of nudged gcm runs with observations |
publisher |
HAL CCSD |
publishDate |
2004 |
url |
https://hal.science/hal-00295386 https://hal.science/hal-00295386/document https://hal.science/hal-00295386/file/acp-4-81-2004.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.science/hal-00295386 Atmospheric Chemistry and Physics, 2004, 4 (1), pp.81-93 |
op_relation |
hal-00295386 https://hal.science/hal-00295386 https://hal.science/hal-00295386/document https://hal.science/hal-00295386/file/acp-4-81-2004.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1784263879236255744 |