On the lack of stratospheric dynamical variability in low-top versions of the CMIP5 models

Charlton-Perez, Andrew J., Baldwin, Mark P., Birner, Thomas, Black, Robert X., Butler, Amy H., Calvo, Natalia, Davis, Nicholas A., Gerber, Edwin P., Gillett, Nathan, Hardiman, Steven, Kim, Junsu, Krüger, Kirstin, Lee, Yun-Young, Manzini, Elisa, McDaniel, Brent A., Polvani, Lorenzo, Reichler, Thomas, Shaw, Tiffany A., Sigmond, Michael, Son, Seok-Woo, Toohey, Matthew, Wilcox, Laura, Yoden, Shigeo, Christiansen, Bo, Lott, Francois, Shindell, Drew, Yukimoto, Seiji and Watanabe, Shingo (2012) On the lack of stratospheric dynamical variability in low-top versions of the CMIP5 models Journal of Geophysical Research: Atmospheres, 118 (6). pp. 2494-2505. DOI 10.1002/jgrd.50125.

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Abstract

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

Document Type: Article
Additional Information: WOS:000317843200003
Keywords: Coupled Model Intercomparison Project; CMIP5; TEMPERATURE TRENDS; CLIMATE-CHANGE; PART I; WINTER; CIRCULATION; OZONE; CONFIGURATION; SIMULATIONS; IMPACT; WELL
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Refereed: Yes
DOI etc.: 10.1002/jgrd.50125
ISSN: 2169-8996
Projects: CLIVAR, CMIP5
Date Deposited: 03 Dec 2012 10:53
Last Modified: 06 Feb 2018 13:00
URI: http://eprints.uni-kiel.de/id/eprint/19451

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