globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2016MS000683
Scopus ID: 2-s2.0-84990931050
Inter-model comparison of subseasonal tropical variability in aquaplanet experiments: Effect of a warm pool
Author: Leroux S; , Bellon G; , Roehrig R; , Caian M; , Klingaman N; P; , Lafore J; -P; , Musat I; , Rio C; , Tyteca S
Source Publication: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
Publishing Year: 2016
Volume: 8, Issue:4
pages begin: 1526
pages end: 1551
Language: 英语
Keyword: Climatology ; Tropics ; Aquaplanet ; Convective heating ; Madden-Julian oscillation ; Model comparison ; Spectral characteristics ; State of the art ; Subseasonal variability ; Tropical variability ; Lakes ; atmosphere-ocean coupling ; atmospheric general circulation model ; convective system ; experimental study ; heating ; Madden-Julian oscillation ; model test ; parameterization ; seasonal variation ; tropical meteorology ; warm pool ; westerly
English Abstract: This study compares the simulation of subseasonal tropical variability by a set of six state-of-the-art AGCMs in two experiments in aquaplanet configuration: a zonally symmetric experiment, and an experiment with a warm pool centered on the equator. In all six models, the presence of the warm pool generates zonal asymmetries in the simulated mean states in the form of a “Gill-type” response, made more complex by feedbacks between moisture, convective heating and circulation. Noticeable differences appear from one model to another. Only half the models simulate mean low-level equatorial westerlies over the warm pool area. The presence of the warm pool can also favor the development of large-scale variability consistent with observed Madden-Julian Oscillation (MJO) characteristics, but this happens only in half the models. Our results do not support the idea that the presence of the warm pool and/or of mean low-level equatorial westerlies are sufficient conditions for MJO-like variability to arise in the models. Comparing spectral characteristics of the simulated Convectively Coupled Equatorial Waves (CCEWs) in the aquaplanet experiments and the corresponding coupled atmosphere-ocean (i.e., CMIP) and atmosphere-only (i.e., AMIP) simulations, we also show that there is more consistency for a given model across its configurations, than for a given configuration across the six models. Overall, our results confirm that the simulation of subseasonal variability by given model is significantly influenced by the parameterization of subgrid physical processes (most-likely cloud processes), both directly and through modulation of the mean state. © 2016. The Authors.
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Document Type: 期刊论文
Appears in Collections:影响、适应和脆弱性

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Affiliation: CNRM UMR 3589, Météo-France/CNRS, Toulouse, France; Laboratoire de Glaciologie et Géophysique de l'Environnement, LGGE UMR 5183, CNRS/Univ. Grenoble Alpes, Grenoble, France; Department of Physics, University of Auckland, Auckland, New Zealand; SMHI, Norrköping, Sweden; National Centre for Atmospheric Science-Climate and Department of Meteorology, University of Reading, Reading, United Kingdom; Laboratoire de Météorologie Dynamique/IPSL/UPMC/CNRS, France

Recommended Citation:
Leroux S,, Bellon G,, Roehrig R,et al. Inter-model comparison of subseasonal tropical variability in aquaplanet experiments: Effect of a warm pool[J]. Journal of Advances in Modeling Earth Systems,2016-01-01,8(4)
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