期刊
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
卷 118, 期 6, 页码 2494-2505出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/jgrd.50125
关键词
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资金
- National Centre for Atmospheric Science [CMIP5]
- NSF under the US CLIVAR program
- NSF under Office of Polar Program
- U.S. National Science Foundation
- U.S. Department of Energy, Office of Biological and Environmental Research [DE-FOA000024]
- National Science Foundation [ARC-1107384]
- Spanish Ministry of Science and Innovation (MCINN) [CGL2008-05968-C02-01]
- National Science Foundation
- BMBF [01LP1130B]
- Joint DECC/Defra Met Office Hadley Centre Climate Programme [GA01101]
- European Commission [226520]
- Grants-in-Aid for Scientific Research [22106009] Funding Source: KAKEN
- Natural Environment Research Council [ncas10009] Funding Source: researchfish
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1151768, 0938325] Funding Source: National Science Foundation
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1129519] Funding Source: National Science Foundation
- Directorate For Geosciences
- Division Of Polar Programs [1107384] Funding Source: National Science Foundation
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. Citation: Charlton-Perez, A. J., et al. (2013), On the lack of stratospheric dynamical variability in low-top versions of the CMIP5 models, J. Geophys. Res. Atmos., 118, 2494-2505, doi:10.1002/jgrd.50125.
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