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The role of planetary waves in the tropospheric jet response to stratospheric cooling

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Scott_PlanetaryWaves_GRL_FinalPubVersion.pdf (693.6Kb)
Date
28/03/2016
Author
Smith, Karen L.
Scott, Richard K.
Funder
NERC
Grant ID
NE/H005803/1
Keywords
Stratosphere-troposhere coupling
Planetary waves
Idealized modeling
GE Environmental Sciences
QA Mathematics
3rd-DAS
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Abstract
An idealized general circulation model is used to assess the importance of planetary-scale waves in determining the position of the tropospheric jet, specifically its tendency to shift poleward as winter stratospheric cooling is increased. Full model integrations are compared against integrations in which planetary waves are truncated in the zonal direction, and only synoptic-scale waves are retained. Two series of truncated integrations are considered, using (i) a modified radiative equilibrium temperature or (ii) a nudged-bias correction technique. Both produce tropospheric climatologies that are similar to the full model when stratospheric cooling is weak. When stratospheric cooling is increased, the results indicate that the interaction between planetary- and synoptic-scale waves plays an important role in determining the structure of the tropospheric mean flow and rule out the possibility that the jet shift occurs purely as a response to changes in the planetary- or synoptic-scale wave fields alone.
Citation
Smith , K L & Scott , R K 2016 , ' The role of planetary waves in the tropospheric jet response to stratospheric cooling ' , Geophysical Research Letters , vol. 43 , no. 6 , pp. 2904-2911 . https://doi.org/10.1002/2016GL067849
Publication
Geophysical Research Letters
Status
Peer reviewed
DOI
https://doi.org/10.1002/2016GL067849
ISSN
1944-8007
Type
Journal article
Rights
© 2016, Publisher / the Author(s). This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at onlinelibrary.wiley.com / https://dx.doi.org/10.1002/2016GL067849
Description
K.L.S. is funded in part by a Natural Sciences and Engineering Council of Canada Postdoctoral Fellowship. R.K.S. acknowledges support from the National Science Foundation.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/9528

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