2013年3月27日
On the lack of stratospheric dynamical variability in low-top versions of the CMIP5 models
Journal of Geophysical Research Atmospheres
- 巻
- 118
- 号
- 6
- 開始ページ
- 2494
- 終了ページ
- 2505
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1002/jgrd.50125
- 出版者・発行元
- Blackwell Publishing Ltd
We describe the main differences in simulations of stratospheric climate and variability by models within the fifth Coupled Model Intercomparison Project (CMIP5) that have a model top above the stratopause and relatively fine stratospheric vertical resolution (high-top), and those that have a model top below the stratopause (low-top). Although the simulation of mean stratospheric climate by the two model ensembles is similar, the low-top model ensemble has very weak stratospheric variability on daily and interannual time scales. The frequency of major sudden stratospheric warming events is strongly underestimated by the low-top models with less than half the frequency of events observed in the reanalysis data and high-top models. The lack of stratospheric variability in the low-top models affects their stratosphere-troposphere coupling, resulting in short-lived anomalies in the Northern Annular Mode, which do not produce long-lasting tropospheric impacts, as seen in observations. The lack of stratospheric variability, however, does not appear to have any impact on the ability of the low-top models to reproduce past stratospheric temperature trends. We find little improvement in the simulation of decadal variability for the high-top models compared to the low-top, which is likely related to the fact that neither ensemble produces a realistic dynamical response to volcanic eruptions. © 2013. American Geophysical Union. All Rights Reserved.
- リンク情報
- ID情報
-
- DOI : 10.1002/jgrd.50125
- ISSN : 2169-8996
- SCOPUS ID : 84876733097