Evaluation Of The Circulation Modes In The East Asia By CMIP5Models

Based on1961-2005monthly500hPa geopotential height data of atmospheric general circulation from the U.S. nation center for environmental prediction (NCEP), this paper evaluates the winter and summer’s500hPa geopotential height in East Asia (EA) simulated by39climate models in the the Phase5of Coupled Model Intercomparison Project(CMIP5) historical simulation experiment. EOF, Taylor figures, PDFs and two assessment indicators have been used to find the models which are better in simulating the winter and summer circulation modes in EA. Results show that:(1)The models considered are able to simulate reasonably well these variability modes in the winter. IPSL-CM5B-LR, MPI-ESM-P, CMCC-CMS, FGOALS-g2and HadGEM2-ES are the models better at reproducing winter’s spatial structures, It’s found that all the models considered are able to simulate reasonably well these main modes, WP being the mode which is best spatially simulated and the third mode is worst in the winter. From a temporal point of view, it finds that of all modes in the winter the second mode simulations best, then is WP. CESM1-FASTCHEM, HadGEM2-ES, INM-CM4, GISS-E2-H and BCC-CSM1-1are better at reproducing winter’s PDF. Considering of spatial and temporal structures, HadGEM2-ES, IPSL-CM5B-LR, CESM1-FASTCHEM, INM-CM4and BCC-CSM1-1are better than the other34models in the winter.(2) The models considered are able to simulate reasonably well these variability modes in the summer. ECEARTH, CanESM2, CMCC-CM, GFDL-ESM2G and IPSL-CM5A-MR are better at reproducing summer’s spatial structures and the first mode being the mode which is best spatially simulated and WP is worst in the summer. From a temporal point of view, in the summer the second mode also simulations best, then are the third mode and WP. CCSM4, HadGEM2-CC, GFDL-CM3, MRI-CGCM3, NorESM1-M are better at reproducing summer’s PDF. Considering of spatial and temporal structures, ECEARTH, CMCC-CM, CCSM4, CANESM2and MIROC5are better in the summer.(3) The models simulate these variability modes better in the winter than in the summer. Both spatial structures and temporal structures in the winter or summer, FGOALS-g2、 HadGEM2-CC、 CMCC-CMS、 CESM1-FASTCHEM are better.(4)Based on the definition of PNA, all the models are able to simulate well PNA in the winter. HadGEM2-ES、 ACCESS1-0、 GFDL-CM3、 MIROC-ESM、 MPI-ESM-LR are better at simulating winter’s PNA. From the PDF features of winter’s PNA, BNU-ESM、 HadGEM2-ES、 CESM1-WACCM、MPI-ESM-MR are better at reproducing winter’s PNA’s PDF. Take account of spatial and temporal structures, HadGEM2-ES、 MPI-ESM-MR、 CNRM-CM5、 CESM1-CAM5、 BNU-ESM are better in winter’s PNA.(5) Based on the definition of EAP, all the models are able to simulate well EAP in the summer. CanESM2、 CESM1-WACCM、CMCC-CMS、 GFDL-ESM2G、 MPI-ESM-MR are better at simulating summer’s EAP、 From the PDF features of summer’s EAP, HadGEM2-CC、 CCSM4、 CNRM-CM5、 MIROC-ESM-CHEM are better at reproducing summer’s EAP’s PDF. Take account of spatial and temporal structures, CCSM、 CESM1-WACCM、 HadGEM2-CC、 CANESM2、CNRM-CM5are better in summer’s EAP.(6)While CNRM-CM5、 CESM1-WACCM、 MPI-ESM-MR、 GISS-E2-R are better in both winter’s PNA and summer’s EAP.