Patterns of tropical Pacific convection anomalies and associated extratropical wave trains in AMIP5
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In this paper, the performance of 18 Coupled Model Intercomparison Project Phase 5 (CMIP5) models forced by observational SSTs in simulating the tropical Pacific convective variation and the atmospheric responses in the extratropics are assessed. The multi-model ensemble mean results of 18 CMIP5 models show that five major patterns of tropical Pacific convection anomaly in winter can indeed be well reproduced, however, the simulation of the corresponding extratropical responses for each pattern exists some deficiency except for the La Niña pattern compared with observations. We defined an optimized subset of well performing models (ACCESS1.0, CanAM4, CCSM4, CMCC-CM, HadGEM2-A, MPI-ESM-MR) in tropical Pacific deep convection according to the ranking of model skill score. These models exhibit approximately identical convection anomaly patterns in both amplitude and spatial structure to the observation, which potentially might improve the representation of extratropical teleconnections with the tropical Pacific, especially for the CP El Niño (CPEN), EP El Niño (EPEN) and western CP (W-CP) patterns. Both evident atmospheric anomalies of CPEN and EPEN patterns over the NA/E sector and the northeastward propagating wave trains of W-CP pattern can be quite well simulated in the high-skilled models.
KeywordsAMIP5 model Tropical Pacific convection Extratropical wave train High-skilled model
We thank the two anonymous reviewers for their valuable comments and suggestions, which led to significant improvement in the manuscript. This study is supported jointly by the National Key Research and Development Program (Grant no. 2016YFA0600604), the National Natural Science Foundation of China (Grant 41721004), and the Chinese Academy of Sciences Key Research Program of Frontier Sciences (QYZDY-SSW-DQC024).
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Conflict of interest
The authors declare that they have no conflict of interest.
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