Assessment of the capability of CMIP6 global climate models to simulate Arctic cyclones  

作　　者：SONG Jia-Ning FU Gang XU Ying HAN Zhen-Yu SUN Qi-Zhen WANG Hui 

机构地区：[1]Ocean University of China,Qingdao,266100,China [2]Laboratory for Climate Studies,National Climate Center,China Meteorological Administration,Beijing,100081,China [3]National Marine Environmental Forecasting Center,Beijing,100081,China

出　　处：《Advances in Climate Change Research》2021年第5期660-676,共17页气候变化研究进展（英文版）

基　　金：This study was supported by the National Key Research and Development Programs of China(2017YFA0603703,2017YFA0605004,2016YFC1402700);the National Natural Science Foundation of China(41790471 and 41775042).

摘　　要：Arctic cyclones are one of the important synoptic-scale systems that affect weather variability over the Arctic and can cause intense weather phenomena and disasters.Thus,research on the assessment of the climate characteristics,activity laws,and variability trends of Arctic cyclones using climate models has practical significance.On the basis of the fifth-generation European Center for Medium-Range Weather Forecasts reanalysis(ERA5)data,the spatiotemporal variations of Arctic cyclones during 1981–2014 are analyzed by detecting and tracking cyclones using the Lagrangian method.Then,the simulation results of 14 global climate models from the Coupled Model Intercomparison Project Phase 6(CMIP5)are compared with the results of ERA5.Both the individual models and their ensemble mean can simulate the spatial distribution of the density of cyclone tracks with reasonable capability,the correlation coefficients of track density are approximately 0.6.Furthermore,in boreal winter,the Atlantic zonal negative bias of track density is stronger than that in summer.By contrast,in boreal summer,the negative bias over the Arctic Ocean region is stronger than that in winter.Moreover,the simulations of density-field-related variables(i.e.,cyclolysis,cyclogenesis,track,and lowest center pressure densities)of Arctic cyclones are generally better in winter than in summer,and the models can simulate well that the number of external Arctic cyclones entering the Arctic region from the midlatitudes is more than the internal Arctic cyclones generated inside the Arctic region(60°‒90°N).Furthermore,we show that the capability of models to capture Arctic cyclones with a short lifespan(<3 d)is somewhat poor.Except for the simulation of the minimum pressure of Arctic cyclones,the performance of high-resolution models is better than that of low-resolution models.The simulation of Arctic cyclone radius is poor among all of the variables related to Arctic cyclones,and the observed trends of intensities are not well simulated.In general,the s

关 键 词：CMIP6 Arctic cyclones Simulation capability assessment 

分 类 号：P467[天文地球—大气科学及气象学]