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Open AccessArticle

Activity Characteristics of the East Asian Trough in CMIP5 Models

1
College of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China
2
Maritime Environment Project Office, Beijing 100081, China
3
State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
4
No. 91939 Troops of People’s Liberation Army, Jiangmen 529145, China
*
Author to whom correspondence should be addressed.
Atmosphere 2018, 9(2), 67; https://doi.org/10.3390/atmos9020067
Received: 19 December 2017 / Revised: 8 February 2018 / Accepted: 12 February 2018 / Published: 14 February 2018
(This article belongs to the Special Issue Monsoons)
In this paper, the performances of 12 CMIP5 (Coupled Model Intercomparison Project phase 5) models for simulating the climatology and interannual variability of the East Asian trough (EAT) are assessed using the National Centers for Environmental Prediction (NCEP) reanalysis data and the outputs of the CMIP5 models. The multimodel ensemble (MME) successfully reproduces the spatial pattern and spatial variations in the climatology and interannual variability of the EAT but the intensity and interannual variability of EAT are weaker than in the observations. The biases in intensity (interannual variability) are larger over the southern (northern) part of the EAT than over the northern (southern) part. The intermodel spreads are small for the EAT intensity but are large for its location in terms of both latitude and longitude. The simulated EAT in the MME is about 3° E and 1.5° S of that observed. All 12 CMIP5 models reproduce the first empirical orthogonal function (EOF) mode of EAT activity; however, its intensity and location are only successfully captured in half of the models and its linear weakening trend is simulated in ten models. The second EOF mode of EAT activity and its linear strengthening trend are successfully reproduced in eight models. View Full-Text
Keywords: East Asian trough (EAT); climatology and interannual variability; EOF modes; CMIP5 models East Asian trough (EAT); climatology and interannual variability; EOF modes; CMIP5 models
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Chen, X.; Liu, X.; Li, X.; Liu, M.; Yang, M. Activity Characteristics of the East Asian Trough in CMIP5 Models. Atmosphere 2018, 9, 67.

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