Sensitivity of MJO simulation to the convective adjustment timescale in CAM6OA
Sensitivity of MJO simulation to the convective adjustment timescale in CAM6
对流调整时间尺度(tau)是影响全球环流模式中MJO模拟的关键参数之一,但其敏感性存在争议.本研究利用CAM6模式,通过设置精细的tau梯度试验(间隔0.5小时),系统探究了该参数对MJO模拟技巧的影响.结果表明,增大tau值(尤其是当tau大于两小时时)能显著提升MJO的模拟技巧,包括其振幅和东传信号.其背后的物理机制在于:较大的tau值抑制了对流的发生,使得更多水汽得以在边界层内累积,从而增强了MJO发展和传播所必需的边界层季节内水汽扰动.本研究不仅深化了对tau参数影响MJO物理过程的理解,也为未来通过优化对流参数化方案来改进MJO模拟提供了重要的理论依据和模式发展参考.
Xuan Zhou;Lu Wang;Yesheng Zhu;Haoqian Li;Lin Chen
State Key Laboratory of Climate System Prediction and Risk Management/Key Laboratory of Meteorological Disaster,Ministry of Education/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing,ChinaState Key Laboratory of Climate System Prediction and Risk Management/Key Laboratory of Meteorological Disaster,Ministry of Education/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing,China||Laboratory for Regional Oceanography and Numerical Modeling,Qingdao Marine Science and Technology Center,Qingdao,ChinaZhanjiang Air Traffic Management Station,Civil Aviation Administration of China,Zhanjiang,China||State Key Laboratory of Climate System Prediction and Risk Management/Key Laboratory of Meteorological Disaster,Ministry of Education/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing,ChinaState Key Laboratory of Climate System Prediction and Risk Management/Key Laboratory of Meteorological Disaster,Ministry of Education/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing,ChinaState Key Laboratory of Climate System Prediction and Risk Management/Key Laboratory of Meteorological Disaster,Ministry of Education/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing,China
热带大气季节内振荡大气环流模式积云参数化方案对流调整时间尺度
Madden-julian oscillationGeneral circulation modelCumulus parameterization schemeConvective adjustment timescale
《大气和海洋科学快报（英文版）》 2026 (4)
59-65,7
This work was jointly supported by the National Natural Science Foundation of China[grant numbers 42088101 and 42576024],Excel-lent Youth Natural Science Foundation of Jiangsu Province[grant num-ber BK20230061],and the Joint Open Project of KLME & CIC-FEMD[grant number KLME202501].
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