Upward and downward injection of Rossby wave activity across the tropopause: A new aspect of the troposphere–stratosphere dynamical linkage
Abstract Propagation of zonally confined Rossby wave activity between the troposphere and lower stratosphere of the southern hemisphere during austral winter and spring of 1997 is studied, by using a wave‐activity flux and refractive index, both defined for stationary Rossby waves on a zonally asymm...
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crwiley:10.1256/qj.03.91 2023-12-03T10:29:21+01:00 Upward and downward injection of Rossby wave activity across the tropopause: A new aspect of the troposphere–stratosphere dynamical linkage Nishii, Kazuaki Nakamura, Hisashi 2005 http://dx.doi.org/10.1256/qj.03.91 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1256%2Fqj.03.91 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1256/qj.03.91 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Quarterly Journal of the Royal Meteorological Society volume 131, issue 606, page 545-564 ISSN 0035-9009 1477-870X Atmospheric Science journal-article 2005 crwiley https://doi.org/10.1256/qj.03.91 2023-11-09T13:49:45Z Abstract Propagation of zonally confined Rossby wave activity between the troposphere and lower stratosphere of the southern hemisphere during austral winter and spring of 1997 is studied, by using a wave‐activity flux and refractive index, both defined for stationary Rossby waves on a zonally asymmetric time‐mean flow. A particular event of large‐scale quasi‐stationary cyclogenesis in the troposphere is discussed, to which downward wave‐activity injection from anticyclonic anomalies upstream that had developed in the exit region of the lower‐stratospheric polar‐night jet (PNJ) contributed substantially. Consistent with that downward injection, phase lines of observed stream‐function anomalies exhibited a distinct eastward tilt with height. The development of the anticyclonic anomalies occurred at the leading edge of a quasi‐stationary Rossby wave train propagating along the PNJ, that had originated from a tropospheric blocking ridge farther upstream. Though less common than upward wave‐activity injection across the tropopause, similar events of downward wave‐activity injection occurred several times during that season, primarily in the regions south of Australia and over the central South Pacific, over each of which the PNJ exit overlapped with a tropospheric subpolar jet to form a vertical waveguide locally. It is argued that the downward wave‐activity propagation is essentially due to refraction in the vertically sheared westerlies, and the zonal asymmetries in the time‐mean flow are a likely factor for the observed geographical preference of the downward wave‐activity injection. Copyright © 2005 Royal Meteorological Society. Article in Journal/Newspaper polar night Wiley Online Library (via Crossref) Austral Pacific Quarterly Journal of the Royal Meteorological Society 131 606 545 564 |
institution |
Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Atmospheric Science |
spellingShingle |
Atmospheric Science Nishii, Kazuaki Nakamura, Hisashi Upward and downward injection of Rossby wave activity across the tropopause: A new aspect of the troposphere–stratosphere dynamical linkage |
topic_facet |
Atmospheric Science |
description |
Abstract Propagation of zonally confined Rossby wave activity between the troposphere and lower stratosphere of the southern hemisphere during austral winter and spring of 1997 is studied, by using a wave‐activity flux and refractive index, both defined for stationary Rossby waves on a zonally asymmetric time‐mean flow. A particular event of large‐scale quasi‐stationary cyclogenesis in the troposphere is discussed, to which downward wave‐activity injection from anticyclonic anomalies upstream that had developed in the exit region of the lower‐stratospheric polar‐night jet (PNJ) contributed substantially. Consistent with that downward injection, phase lines of observed stream‐function anomalies exhibited a distinct eastward tilt with height. The development of the anticyclonic anomalies occurred at the leading edge of a quasi‐stationary Rossby wave train propagating along the PNJ, that had originated from a tropospheric blocking ridge farther upstream. Though less common than upward wave‐activity injection across the tropopause, similar events of downward wave‐activity injection occurred several times during that season, primarily in the regions south of Australia and over the central South Pacific, over each of which the PNJ exit overlapped with a tropospheric subpolar jet to form a vertical waveguide locally. It is argued that the downward wave‐activity propagation is essentially due to refraction in the vertically sheared westerlies, and the zonal asymmetries in the time‐mean flow are a likely factor for the observed geographical preference of the downward wave‐activity injection. Copyright © 2005 Royal Meteorological Society. |
format |
Article in Journal/Newspaper |
author |
Nishii, Kazuaki Nakamura, Hisashi |
author_facet |
Nishii, Kazuaki Nakamura, Hisashi |
author_sort |
Nishii, Kazuaki |
title |
Upward and downward injection of Rossby wave activity across the tropopause: A new aspect of the troposphere–stratosphere dynamical linkage |
title_short |
Upward and downward injection of Rossby wave activity across the tropopause: A new aspect of the troposphere–stratosphere dynamical linkage |
title_full |
Upward and downward injection of Rossby wave activity across the tropopause: A new aspect of the troposphere–stratosphere dynamical linkage |
title_fullStr |
Upward and downward injection of Rossby wave activity across the tropopause: A new aspect of the troposphere–stratosphere dynamical linkage |
title_full_unstemmed |
Upward and downward injection of Rossby wave activity across the tropopause: A new aspect of the troposphere–stratosphere dynamical linkage |
title_sort |
upward and downward injection of rossby wave activity across the tropopause: a new aspect of the troposphere–stratosphere dynamical linkage |
publisher |
Wiley |
publishDate |
2005 |
url |
http://dx.doi.org/10.1256/qj.03.91 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1256%2Fqj.03.91 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1256/qj.03.91 |
geographic |
Austral Pacific |
geographic_facet |
Austral Pacific |
genre |
polar night |
genre_facet |
polar night |
op_source |
Quarterly Journal of the Royal Meteorological Society volume 131, issue 606, page 545-564 ISSN 0035-9009 1477-870X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1256/qj.03.91 |
container_title |
Quarterly Journal of the Royal Meteorological Society |
container_volume |
131 |
container_issue |
606 |
container_start_page |
545 |
op_container_end_page |
564 |
_version_ |
1784254634764795904 |