Generation of layering in the upper arctic troposphere away from the jet stream
International audience Ozone sounding databases for two stations, So-dankylä (67° N, 27° E) and Ny-Ålesund (79° N, 12° E) were used in order to investigate the generation of layering in the upper and middle troposphere of the Arctic. We concentrated on dry, ozone-rich and stable layers observed belo...
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Online Access: | https://hal.science/hal-00317132 https://hal.science/hal-00317132/document https://hal.science/hal-00317132/file/angeo-21-1653-2003.pdf |
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ftccsdartic:oai:HAL:hal-00317132v1 2024-02-11T10:01:16+01:00 Generation of layering in the upper arctic troposphere away from the jet stream Karpetchko, A. Kyro, E. von Der Gathen, P. Finnish Meteorological Institute (FMI) Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association 2003 https://hal.science/hal-00317132 https://hal.science/hal-00317132/document https://hal.science/hal-00317132/file/angeo-21-1653-2003.pdf en eng HAL CCSD European Geosciences Union hal-00317132 https://hal.science/hal-00317132 https://hal.science/hal-00317132/document https://hal.science/hal-00317132/file/angeo-21-1653-2003.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317132 Annales Geophysicae, 2003, 21 (7), pp.1653-1665 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2003 ftccsdartic 2024-01-21T00:49:16Z International audience Ozone sounding databases for two stations, So-dankylä (67° N, 27° E) and Ny-Ålesund (79° N, 12° E) were used in order to investigate the generation of layering in the upper and middle troposphere of the Arctic. We concentrated on dry, ozone-rich and stable layers observed below the thermal tropopause under light wind conditions. This condition ensures that the observed layer is not a tropopause fold, a well-known phenomenon that develops within frontal zones near the jet stream. Selection criteria for ozone, humidity and stability anomalies of the tropopause fold detection algorithm were used here to pick out for detailed studies the most pronounced examples of laminae. For all these cases the meteorological situations were investigated in order to establish the origin of the observed layers. We found that layers could be classified into two groups. Laminae of the first group were observed equatorward of the jet stream and those of a second group were observed poleward of the jet. The meteorological situation for the first group resembles that for equatorward stratospheric streamer propagation. It was found that this group accounts for only a small fraction of the layers observed at Sodankylä and for none of those observed at Ny-Ålesund during the period investigated. A large case-to-case variability in the synoptic situation was observed for the second group of laminae, which were detected northward of the jet stream. Nevertheless, in about half of the cases, streamers of tropospheric air were found in the vicinity of the stations on the isentropic surfaces just above the detected stratospheric layers. Back trajectory analyses showed that these layers originated in the vicinity of the polar jet stream. We suppose that laminae-like structures in the troposphere were caused, in both groups, by equatorward (poleward) advection of the stratospheric (tropospheric) air, together with differential vertical shear. Forward-trajectory calculations suggest that, subsequently, a part of the ... Article in Journal/Newspaper Arctic Ny Ålesund Ny-Ålesund Sodankylä Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic Ny-Ålesund Sodankylä ENVELOPE(26.600,26.600,67.417,67.417) |
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 [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Karpetchko, A. Kyro, E. von Der Gathen, P. Generation of layering in the upper arctic troposphere away from the jet stream |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Ozone sounding databases for two stations, So-dankylä (67° N, 27° E) and Ny-Ålesund (79° N, 12° E) were used in order to investigate the generation of layering in the upper and middle troposphere of the Arctic. We concentrated on dry, ozone-rich and stable layers observed below the thermal tropopause under light wind conditions. This condition ensures that the observed layer is not a tropopause fold, a well-known phenomenon that develops within frontal zones near the jet stream. Selection criteria for ozone, humidity and stability anomalies of the tropopause fold detection algorithm were used here to pick out for detailed studies the most pronounced examples of laminae. For all these cases the meteorological situations were investigated in order to establish the origin of the observed layers. We found that layers could be classified into two groups. Laminae of the first group were observed equatorward of the jet stream and those of a second group were observed poleward of the jet. The meteorological situation for the first group resembles that for equatorward stratospheric streamer propagation. It was found that this group accounts for only a small fraction of the layers observed at Sodankylä and for none of those observed at Ny-Ålesund during the period investigated. A large case-to-case variability in the synoptic situation was observed for the second group of laminae, which were detected northward of the jet stream. Nevertheless, in about half of the cases, streamers of tropospheric air were found in the vicinity of the stations on the isentropic surfaces just above the detected stratospheric layers. Back trajectory analyses showed that these layers originated in the vicinity of the polar jet stream. We suppose that laminae-like structures in the troposphere were caused, in both groups, by equatorward (poleward) advection of the stratospheric (tropospheric) air, together with differential vertical shear. Forward-trajectory calculations suggest that, subsequently, a part of the ... |
author2 |
Finnish Meteorological Institute (FMI) Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association |
format |
Article in Journal/Newspaper |
author |
Karpetchko, A. Kyro, E. von Der Gathen, P. |
author_facet |
Karpetchko, A. Kyro, E. von Der Gathen, P. |
author_sort |
Karpetchko, A. |
title |
Generation of layering in the upper arctic troposphere away from the jet stream |
title_short |
Generation of layering in the upper arctic troposphere away from the jet stream |
title_full |
Generation of layering in the upper arctic troposphere away from the jet stream |
title_fullStr |
Generation of layering in the upper arctic troposphere away from the jet stream |
title_full_unstemmed |
Generation of layering in the upper arctic troposphere away from the jet stream |
title_sort |
generation of layering in the upper arctic troposphere away from the jet stream |
publisher |
HAL CCSD |
publishDate |
2003 |
url |
https://hal.science/hal-00317132 https://hal.science/hal-00317132/document https://hal.science/hal-00317132/file/angeo-21-1653-2003.pdf |
long_lat |
ENVELOPE(26.600,26.600,67.417,67.417) |
geographic |
Arctic Ny-Ålesund Sodankylä |
geographic_facet |
Arctic Ny-Ålesund Sodankylä |
genre |
Arctic Ny Ålesund Ny-Ålesund Sodankylä |
genre_facet |
Arctic Ny Ålesund Ny-Ålesund Sodankylä |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317132 Annales Geophysicae, 2003, 21 (7), pp.1653-1665 |
op_relation |
hal-00317132 https://hal.science/hal-00317132 https://hal.science/hal-00317132/document https://hal.science/hal-00317132/file/angeo-21-1653-2003.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1790597054885527552 |