On the lack of stratospheric dynamical variability in low-top versions of the CMIP5 models - Archive ouverte HAL Access content directly
Journal Articles Journal of Geophysical Research: Atmospheres Year : 2013

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

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M. Sigmond
D. Shindell
S. Watanabe

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. © 2013. American Geophysical Union. All Rights Reserved.
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Dates and versions

hal-01099072 , version 1 (12-04-2021)

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Andrew J. Charlton-Perez, M.P. Baldwin, T. Birner, R.X. Black, A.H. Butler, et al.. On the lack of stratospheric dynamical variability in low-top versions of the CMIP5 models. Journal of Geophysical Research: Atmospheres, 2013, 118 (6), pp.2494-2505. ⟨10.1002/jgrd.50125⟩. ⟨hal-01099072⟩
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