Patterns of tropical Pacific convection anomalies and associated extratropical wave trains in AMIP5

Patterns of tropical Pacific convection anomalies and associated extratropical wave trains in AMIP5 In this paper, the performance of 18 Coupled Model Intercomparison Project Phase 5 (CMIP5) models forced by obser- vational 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. Keywords AMIP5 model · Tropical Pacific convection · Extratropical wave train · http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Climate Dynamics Springer Journals

Patterns of tropical Pacific convection anomalies and associated extratropical wave trains in AMIP5

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Publisher
Springer Journals
Copyright
Copyright © 2018 by Springer-Verlag GmbH Germany, part of Springer Nature
Subject
Earth Sciences; Geophysics/Geodesy; Climatology; Oceanography
ISSN
0930-7575
eISSN
1432-0894
D.O.I.
10.1007/s00382-018-4278-0
Publisher site
See Article on Publisher Site

Abstract

In this paper, the performance of 18 Coupled Model Intercomparison Project Phase 5 (CMIP5) models forced by obser- vational 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. Keywords AMIP5 model · Tropical Pacific convection · Extratropical wave train ·

Journal

Climate DynamicsSpringer Journals

Published: May 30, 2018

References

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