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Preliminary analysis of the zonal distribution of ENSO-related ssta in three CMIP5 coupled models

Atmospheric and Oceanic Science Letters 2020年第5期13卷 443-451页

作者： GE Zi-an CHEN Lin Key Laboratory of Meteorological Disaster Ministry of Education(Klme)/joint International Research Laboratory of Climate and Environmental Change(Ilcec)/collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science and TechnologyNanjingChina State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of SciencesXi’anChina

The simulated sea surface temperature anomaly(ssta)over the tropical Pacific during El Ni?o–Southern Oscillation(ENSO)is investigated in three representative coupled models:CESM1-CAM5,FGOALS-s2,and *** is found that there is a significant westward shift bias in reproducing the zonal distribution(ZD)of the ENSO-related ssta in CESM1-CAM5 and FGOALS-s2,whereas the ssta-ZD simulated by FGOALS-g2 is relatively *** examining the ssta-ZD during both warm and cold phases of ENSO separately,the authors reveal that the ssta-ZD simulation bias during the ENSO cycle mainly lies in the bias during the warm *** is noted that both the simulated zonal wind stress anomaly(τ’_x)and shortwave heat flux(SW)anomaly exhibit westward shift biases in CESM1-CAM5 and FGOALS-s2,while the counterparts in FGOALS-g2 are relatively *** westward shift biases in representingτ’_x and the SW anomaly(SWA)are attributed to the westward-shifted precipitation anomaly(PrA).It is suggested that the mean SST cold bias over the cold tongue region is the key factor behind the westward-shift bias in simulating the El Ni?o-related PrA,which leads to the westward-shiftedτ’_x and ***,the aforementioned anomaly fields,including the dynamic part(τ’_x)and thermodynamic part(SWA),contribute to the westward-shift bias in simulating the El Ni?o-related *** study provides clues for understanding the ZD simulation biases of ENSO-related fields;however,further in-depth investigation with more model simulations,especially the incoming CMIP6 simulations,is still needed to fully understand the ENSO ssta-ZD simulation bias in coupled models.

关键词： ENSO ssta zonal distribution coupled models simulation bias

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