Tropopause Based on O3, Stratospheric Tracer (SF6) Ages, and Water Vapor Isotope (D, T) Tracers
Abstract. Based upon airborne trace gas and isotope observations in the winter months 1991/1992 to 1994/1995, transport pathways across the mid-latitude and Arctic tropopause are investigated. A powerful set of contrasting transport tracers are examined, such as deuterated water vapor (HDO) which is...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.523.8251 2023-05-15T14:51:11+02:00 Tropopause Based on O3, Stratospheric Tracer (SF6) Ages, and Water Vapor Isotope (D, T) Tracers Andreas Zahn The Pennsylvania State University CiteSeerX Archives 1999 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.523.8251 http://www-imk.fzk.de/asf/chemie/papers/JAC_Zahn_2001.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.523.8251 http://www-imk.fzk.de/asf/chemie/papers/JAC_Zahn_2001.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www-imk.fzk.de/asf/chemie/papers/JAC_Zahn_2001.pdf text 1999 ftciteseerx 2016-01-08T10:15:57Z Abstract. Based upon airborne trace gas and isotope observations in the winter months 1991/1992 to 1994/1995, transport pathways across the mid-latitude and Arctic tropopause are investigated. A powerful set of contrasting transport tracers are examined, such as deuterated water vapor (HDO) which is shown to trace the passage of water vapor from the troposphere into the low-ermost stratosphere (LS), or the ‘SF6 age ’ defined as the residence time of an air parcel within the stratosphere since its entry at the tropopause. Cross-tropopause transport in both directions was found near mid-latitude cyclones (at baroclinic flanks of troughs in the polar front), in which about 80 % of the stratosphere-to-troposphere flux proceeded along potential temperature (θ) surfaces of 300 ± 10 K. As these isentropes are the lowest which reach into the LS (in winter), a mixing zone just above the Arctic tropopause (at least 1.5 km thick) is formed. Here, upwelling tropospheric air is mixed with downwelling LS air which is affected by air from higher altitudes, the surf-zone and the polar vortex. The observed elevated D/H isotope ratio of water vapor within the mixing zone can be explained by injection of subtropical water vapor that is transported to the tropopause by the warm conveyor belt associated with mid-latitude cyclones. Downward vertical transport of Arctic LS air, which may be influenced by ouflowing chemically disturbed polar vortex air, into the Arctic troposphere was found to be small. Key words: extra-tropical stratospheric-tropospheric exchange, isotope composition of tropospheric and stratospheric water vapor. 1. Text Arctic Unknown Arctic |
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English |
description |
Abstract. Based upon airborne trace gas and isotope observations in the winter months 1991/1992 to 1994/1995, transport pathways across the mid-latitude and Arctic tropopause are investigated. A powerful set of contrasting transport tracers are examined, such as deuterated water vapor (HDO) which is shown to trace the passage of water vapor from the troposphere into the low-ermost stratosphere (LS), or the ‘SF6 age ’ defined as the residence time of an air parcel within the stratosphere since its entry at the tropopause. Cross-tropopause transport in both directions was found near mid-latitude cyclones (at baroclinic flanks of troughs in the polar front), in which about 80 % of the stratosphere-to-troposphere flux proceeded along potential temperature (θ) surfaces of 300 ± 10 K. As these isentropes are the lowest which reach into the LS (in winter), a mixing zone just above the Arctic tropopause (at least 1.5 km thick) is formed. Here, upwelling tropospheric air is mixed with downwelling LS air which is affected by air from higher altitudes, the surf-zone and the polar vortex. The observed elevated D/H isotope ratio of water vapor within the mixing zone can be explained by injection of subtropical water vapor that is transported to the tropopause by the warm conveyor belt associated with mid-latitude cyclones. Downward vertical transport of Arctic LS air, which may be influenced by ouflowing chemically disturbed polar vortex air, into the Arctic troposphere was found to be small. Key words: extra-tropical stratospheric-tropospheric exchange, isotope composition of tropospheric and stratospheric water vapor. 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Andreas Zahn |
spellingShingle |
Andreas Zahn Tropopause Based on O3, Stratospheric Tracer (SF6) Ages, and Water Vapor Isotope (D, T) Tracers |
author_facet |
Andreas Zahn |
author_sort |
Andreas Zahn |
title |
Tropopause Based on O3, Stratospheric Tracer (SF6) Ages, and Water Vapor Isotope (D, T) Tracers |
title_short |
Tropopause Based on O3, Stratospheric Tracer (SF6) Ages, and Water Vapor Isotope (D, T) Tracers |
title_full |
Tropopause Based on O3, Stratospheric Tracer (SF6) Ages, and Water Vapor Isotope (D, T) Tracers |
title_fullStr |
Tropopause Based on O3, Stratospheric Tracer (SF6) Ages, and Water Vapor Isotope (D, T) Tracers |
title_full_unstemmed |
Tropopause Based on O3, Stratospheric Tracer (SF6) Ages, and Water Vapor Isotope (D, T) Tracers |
title_sort |
tropopause based on o3, stratospheric tracer (sf6) ages, and water vapor isotope (d, t) tracers |
publishDate |
1999 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.523.8251 http://www-imk.fzk.de/asf/chemie/papers/JAC_Zahn_2001.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
http://www-imk.fzk.de/asf/chemie/papers/JAC_Zahn_2001.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.523.8251 http://www-imk.fzk.de/asf/chemie/papers/JAC_Zahn_2001.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766322235559116800 |