Climatological features of stratospheric streamers in the FUB-CMAM with increased horizontal resolution
International audience The purpose of this study is to investigate horizontal transport processes in the winter stratosphere using data with a resolution relevant for chemistry and climate modeling. For this reason the Freie Universität Berlin Climate Middle Atmosphere Model (FUB-CMAM) with its mode...
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ftinsu:oai:HAL:hal-00295621v1 2023-11-12T04:12:49+01:00 Climatological features of stratospheric streamers in the FUB-CMAM with increased horizontal resolution Krüger, K. Langematz, U. Grenfell, J. L. Labitzke, K. Institut für Meteorologie Berlin Freie Universität Berlin 2005-01-21 https://hal.science/hal-00295621 https://hal.science/hal-00295621/document https://hal.science/hal-00295621/file/acp-5-547-2005.pdf en eng HAL CCSD European Geosciences Union hal-00295621 https://hal.science/hal-00295621 https://hal.science/hal-00295621/document https://hal.science/hal-00295621/file/acp-5-547-2005.pdf info:eu-repo/semantics/OpenAccess ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.science/hal-00295621 Atmospheric Chemistry and Physics, 2005, 5 (2), pp.547-562 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2005 ftinsu 2023-10-25T16:30:05Z International audience The purpose of this study is to investigate horizontal transport processes in the winter stratosphere using data with a resolution relevant for chemistry and climate modeling. For this reason the Freie Universität Berlin Climate Middle Atmosphere Model (FUB-CMAM) with its model top at 83 km altitude, increased horizontal resolution T42 and the semi-Lagrangian transport scheme for advecting passive tracers is used. A new approach of this paper is the classification of specific transport phenomena within the stratosphere into tropical-subtropical streamers (e.g. Offermann et al., 1999) and polar vortex extrusions hereafter called polar vortex streamers. To investigate the role played by these large-scale structures on the inter-annual and seasonal variability of transport processes in northern mid-latitudes, the global occurrence of such streamers was calculated based on a 10-year model climatology, concentrating on the existence of the Arctic polar vortex. For the identification and counting of streamers, the new method of zonal anomaly was chosen. The analysis of the months October-May yielded a maximum occurrence of tropical-subtropical streamers during Arctic winter and spring in the middle and upper stratosphere. Synoptic maps revealed highest intensities in the subtropics over East Asia with a secondary maximum over the Atlantic in the northern hemisphere. Furthermore, tropical-subtropical streamers exhibited a higher occurrence than polar vortex streamers, indicating that the subtropical barrier is more permeable than the polar vortex barrier (edge) in the model, which is in good correspondence with observations (e.g. Plumb, 2002; Neu et al., 2003). Interesting for the total ozone decrease in mid-latitudes is the consideration of the lower stratosphere for tropical-subtropical streamers and the stratosphere above ~20 km altitude for polar vortex streamers, where strongest ozone depletion is observed at polar latitudes (WMO, 2003). In the lower stratosphere the FUB-CMAM simulated a ... Article in Journal/Newspaper Arctic Institut national des sciences de l'Univers: HAL-INSU Arctic |
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Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Krüger, K. Langematz, U. Grenfell, J. L. Labitzke, K. Climatological features of stratospheric streamers in the FUB-CMAM with increased horizontal resolution |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience The purpose of this study is to investigate horizontal transport processes in the winter stratosphere using data with a resolution relevant for chemistry and climate modeling. For this reason the Freie Universität Berlin Climate Middle Atmosphere Model (FUB-CMAM) with its model top at 83 km altitude, increased horizontal resolution T42 and the semi-Lagrangian transport scheme for advecting passive tracers is used. A new approach of this paper is the classification of specific transport phenomena within the stratosphere into tropical-subtropical streamers (e.g. Offermann et al., 1999) and polar vortex extrusions hereafter called polar vortex streamers. To investigate the role played by these large-scale structures on the inter-annual and seasonal variability of transport processes in northern mid-latitudes, the global occurrence of such streamers was calculated based on a 10-year model climatology, concentrating on the existence of the Arctic polar vortex. For the identification and counting of streamers, the new method of zonal anomaly was chosen. The analysis of the months October-May yielded a maximum occurrence of tropical-subtropical streamers during Arctic winter and spring in the middle and upper stratosphere. Synoptic maps revealed highest intensities in the subtropics over East Asia with a secondary maximum over the Atlantic in the northern hemisphere. Furthermore, tropical-subtropical streamers exhibited a higher occurrence than polar vortex streamers, indicating that the subtropical barrier is more permeable than the polar vortex barrier (edge) in the model, which is in good correspondence with observations (e.g. Plumb, 2002; Neu et al., 2003). Interesting for the total ozone decrease in mid-latitudes is the consideration of the lower stratosphere for tropical-subtropical streamers and the stratosphere above ~20 km altitude for polar vortex streamers, where strongest ozone depletion is observed at polar latitudes (WMO, 2003). In the lower stratosphere the FUB-CMAM simulated a ... |
author2 |
Institut für Meteorologie Berlin Freie Universität Berlin |
format |
Article in Journal/Newspaper |
author |
Krüger, K. Langematz, U. Grenfell, J. L. Labitzke, K. |
author_facet |
Krüger, K. Langematz, U. Grenfell, J. L. Labitzke, K. |
author_sort |
Krüger, K. |
title |
Climatological features of stratospheric streamers in the FUB-CMAM with increased horizontal resolution |
title_short |
Climatological features of stratospheric streamers in the FUB-CMAM with increased horizontal resolution |
title_full |
Climatological features of stratospheric streamers in the FUB-CMAM with increased horizontal resolution |
title_fullStr |
Climatological features of stratospheric streamers in the FUB-CMAM with increased horizontal resolution |
title_full_unstemmed |
Climatological features of stratospheric streamers in the FUB-CMAM with increased horizontal resolution |
title_sort |
climatological features of stratospheric streamers in the fub-cmam with increased horizontal resolution |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.science/hal-00295621 https://hal.science/hal-00295621/document https://hal.science/hal-00295621/file/acp-5-547-2005.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-00295621 Atmospheric Chemistry and Physics, 2005, 5 (2), pp.547-562 |
op_relation |
hal-00295621 https://hal.science/hal-00295621 https://hal.science/hal-00295621/document https://hal.science/hal-00295621/file/acp-5-547-2005.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782331138535063552 |