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85926 |
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|a Domeisen, Daniela I. V.
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|a Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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|a Plumb, R. Alan
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|a Plumb, R. Alan
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|a Traveling planetary-scale Rossby waves in the winter stratosphere: The role of tropospheric baroclinic instability
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|b American Geophysical Union,
|c 2014-03-27T15:55:55Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/85926
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|a The Southern Hemisphere winter stratosphere exhibits prominent traveling planetary-scale Rossby waves, which generally are not able to induce Stratospheric Sudden Warmings. A series of runs of a simplified general circulation model is presented, aimed at better understanding the generation of these waves. While the generation of planetary-scale traveling waves through the interaction of synoptic-scale waves is observed in a control run, when the model is truncated to permit only waves with zonal wave number 1 or 2, the long waves are found to increase in strength, leading to a considerably more active stratosphere including Sudden Warmings comparable in strength to Northern Hemisphere winter. This finding suggests that the role of tropospheric synoptic eddies is two-fold: while generating a weak planetary-scale wave flux into the stratosphere, their main effect is to suppress baroclinic instability of planetary-scale waves by stabilizing the tropospheric mean state.
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|a National Science Foundation (U.S.) (grant 0808831)
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|a en_US
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|a Article
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|t Geophysical Research Letters
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