Dynamical processes in the stratosphere and upper troposphere and their influence on the distribution of trace gases in the polar atmosphere
Transport plays an important role in the distribution of long-lived gases such as ozone and water vapour in the atmosphere. Understanding of observed variability in these gases as well as prediction of the future changes depends therefore on our knowledge of the relevant atmospheric dynamics. This d...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/23270 2023-08-20T04:02:33+02:00 Dynamical processes in the stratosphere and upper troposphere and their influence on the distribution of trace gases in the polar atmosphere Karpechko, Alexey Vaughan, Geraint University of Helsinki, Faculty of Science, Department of Physical Sciences, Division of Atmospheric Sciences Helsingin yliopisto, matemaattis-luonnontieteellinen tiedekunta, fysikaalisten tieteiden laitos Helsingfors universitet, matematisk-naturvetenskapliga fakulteten, institutionen för fysikaliska vetenskaper Kyrö, Esko 2010-11-25T14:11:42Z application/pdf http://hdl.handle.net/10138/23270 eng eng Helsingin yliopisto Helsingfors universitet University of Helsinki URN:ISBN:978-951-697-622-1 Helsinki: Yliopistopaino, 2007, Finnish Meteorological Institute Contributions. 0782-6117 http://hdl.handle.net/10138/23270 URN:ISBN:978-952-10-3885-3 Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. meteorologia Text Doctoral dissertation (article-based) Artikkeliväitöskirja Artikelavhandling doctoralThesis 2010 ftunivhelsihelda 2023-07-28T06:24:51Z Transport plays an important role in the distribution of long-lived gases such as ozone and water vapour in the atmosphere. Understanding of observed variability in these gases as well as prediction of the future changes depends therefore on our knowledge of the relevant atmospheric dynamics. This dissertation studies certain dynamical processes in the stratosphere and upper troposphere which influence the distribution of ozone and water vapour in the atmosphere. The planetary waves that originate in the troposphere drive the stratospheric circulation. They influence both the meridional transport of substances as well as parameters of the polar vortices. In turn, temperatures inside the polar vortices influence abundance of the Polar Stratospheric Clouds (PSC) and therefore the chemical ozone destruction. Wave forcing of the stratospheric circulation is not uniform during winter. The November-December averaged stratospheric eddy heat flux shows a significant anticorrelation with the January-February averaged eddy heat flux in the midlatitude stratosphere and troposphere. These intraseasonal variations are attributable to the internal stratospheric vacillations. In the period 1979-2002, the wave forcing exhibited a negative trend which was confined to the second half of winter only. In the period 1958-2002, area, strength and longevity of the Arctic polar vortices do not exhibit significant long-term changes while the area with temperatures lower than the threshold temperature for PSC formation shows statistically significant increase. However, the Arctic vortex parameters show significant decadal changes which are mirrored in the ozone variability. Monthly ozone tendencies in the Northern Hemisphere show significant correlations (|r|=0.7) with proxies of the stratospheric circulation. In the Antarctic, the springtime vortex in the lower stratosphere shows statistically significant trends in temperature, longevity and strength (but not in area) in the period 1979-2001. Analysis of the ozone and water vapour ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Arctic Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto Arctic Antarctic The Antarctic |
institution |
Open Polar |
collection |
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
meteorologia |
spellingShingle |
meteorologia Karpechko, Alexey Dynamical processes in the stratosphere and upper troposphere and their influence on the distribution of trace gases in the polar atmosphere |
topic_facet |
meteorologia |
description |
Transport plays an important role in the distribution of long-lived gases such as ozone and water vapour in the atmosphere. Understanding of observed variability in these gases as well as prediction of the future changes depends therefore on our knowledge of the relevant atmospheric dynamics. This dissertation studies certain dynamical processes in the stratosphere and upper troposphere which influence the distribution of ozone and water vapour in the atmosphere. The planetary waves that originate in the troposphere drive the stratospheric circulation. They influence both the meridional transport of substances as well as parameters of the polar vortices. In turn, temperatures inside the polar vortices influence abundance of the Polar Stratospheric Clouds (PSC) and therefore the chemical ozone destruction. Wave forcing of the stratospheric circulation is not uniform during winter. The November-December averaged stratospheric eddy heat flux shows a significant anticorrelation with the January-February averaged eddy heat flux in the midlatitude stratosphere and troposphere. These intraseasonal variations are attributable to the internal stratospheric vacillations. In the period 1979-2002, the wave forcing exhibited a negative trend which was confined to the second half of winter only. In the period 1958-2002, area, strength and longevity of the Arctic polar vortices do not exhibit significant long-term changes while the area with temperatures lower than the threshold temperature for PSC formation shows statistically significant increase. However, the Arctic vortex parameters show significant decadal changes which are mirrored in the ozone variability. Monthly ozone tendencies in the Northern Hemisphere show significant correlations (|r|=0.7) with proxies of the stratospheric circulation. In the Antarctic, the springtime vortex in the lower stratosphere shows statistically significant trends in temperature, longevity and strength (but not in area) in the period 1979-2001. Analysis of the ozone and water vapour ... |
author2 |
Vaughan, Geraint University of Helsinki, Faculty of Science, Department of Physical Sciences, Division of Atmospheric Sciences Helsingin yliopisto, matemaattis-luonnontieteellinen tiedekunta, fysikaalisten tieteiden laitos Helsingfors universitet, matematisk-naturvetenskapliga fakulteten, institutionen för fysikaliska vetenskaper Kyrö, Esko |
format |
Doctoral or Postdoctoral Thesis |
author |
Karpechko, Alexey |
author_facet |
Karpechko, Alexey |
author_sort |
Karpechko, Alexey |
title |
Dynamical processes in the stratosphere and upper troposphere and their influence on the distribution of trace gases in the polar atmosphere |
title_short |
Dynamical processes in the stratosphere and upper troposphere and their influence on the distribution of trace gases in the polar atmosphere |
title_full |
Dynamical processes in the stratosphere and upper troposphere and their influence on the distribution of trace gases in the polar atmosphere |
title_fullStr |
Dynamical processes in the stratosphere and upper troposphere and their influence on the distribution of trace gases in the polar atmosphere |
title_full_unstemmed |
Dynamical processes in the stratosphere and upper troposphere and their influence on the distribution of trace gases in the polar atmosphere |
title_sort |
dynamical processes in the stratosphere and upper troposphere and their influence on the distribution of trace gases in the polar atmosphere |
publisher |
Helsingin yliopisto |
publishDate |
2010 |
url |
http://hdl.handle.net/10138/23270 |
geographic |
Arctic Antarctic The Antarctic |
geographic_facet |
Arctic Antarctic The Antarctic |
genre |
Antarc* Antarctic Arctic |
genre_facet |
Antarc* Antarctic Arctic |
op_relation |
URN:ISBN:978-951-697-622-1 Helsinki: Yliopistopaino, 2007, Finnish Meteorological Institute Contributions. 0782-6117 http://hdl.handle.net/10138/23270 URN:ISBN:978-952-10-3885-3 |
op_rights |
Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. |
_version_ |
1774713070054014976 |