Activity Characteristics of the East Asian Trough in CMIP5 Models

作者：Chen, Xiong; Liu, Xing; Li, Xin^*; Liu, Mingyang; Yang, Minghao

来源：Atmosphere, 2018, 9(2): 67.

DOI：10.3390/atmos9020067

• East Asian trough (EAT)
• climatology and interannual variability
• EOF modes
• CMIP5 models

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 degrees E and 1.5 degrees S of that observed. All 12 CMIP5 models reproduce the first empirical orthogonal 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.

• 出版日期2018-2
• 单位中国人民解放军国防科学技术大学; 中国科学院大气物理研究所