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What kind of stratospheric sudden warming propagates to the troposphere?
| Title: | What kind of stratospheric sudden warming propagates to the troposphere? |
| Authors: | Nakagawa, Ken I. Browse this author | | Yamazaki, Koji2 Browse this author →KAKEN DB |
| Authors(alt): | 山崎, 孝治2 |
| Issue Date: | 16-Feb-2006 |
| Publisher: | American Geophysical Union |
| Journal Title: | Geophysical Research Letters |
| Volume: | 33 |
| Start Page: | L04801 |
| Publisher DOI: | 10.1029/2005GL024784 |
| Abstract: | The factors affecting the downward propagation of stratospheric sudden warming (SSW) events to the troposphere are studied through composite analysis of 45-year reanalysis data from the European Centre for Medium-Range Weather Forecasts. During the growth stage of SSW, events that propagate into the troposphere exhibit enhanced upward flux of the wavenumber 2 wave, while events that do not propagate downward display reduced wavenumber 2 flux. In both events, upward flux of the wavenumber-1 wave is enhanced, but the enhancement is stronger in the non-propagating event. The composite for propagating events reveals a negative Eurasian pattern of horizontal geopotential anomalies in the troposphere during the growth stage, and a negative Arctic Oscillation pattern following the event, while non-propagating events are preceded by a positive Eurasian pattern. In both types of event, the tropospheric anomalies are generated mainly by tropospheric planetary wave forcing prior to the emergence of SSW. |
| Description: | An edited version of this paper was published by AGU.
Copyright 2006, American Geophysical Union, Geophysical Research Letters, 33 |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/1438 |
| Appears in Collections: | 環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 山崎 孝治
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