Diabatic Processes of the Madden-Julian Oscillation (MJO): Enabling and Analyzing THORPEX MJO Task Force and GEWEX Atmospheric System Study Global Model Evaluation Project

鉴于非绝热加热在Madden-Julian振荡(MJO)物理和理论中的核心作用，以及在模拟和预测MJO及相关现象时减少模式缺陷的要求，探索如何在现有的大气环流模式中描述MJO垂直加热结构是非常有兴趣和迫切需要的。为了满足这一需求，世界气候研究计划(WCRP)、世界天气研究计划(WWRP)/THORPEX MJO任务组(MJOTF)和Gewex大气系统研究(GASS)建议并制定了一项联合研究活动。国际研究活动的目标是描述、比较和评价与MJO有关的加热、增湿和动量混合过程，这些过程是由当今全球天气和气候模式产生的，重点是它们的垂直结构。GASS活动是对MJO垂直结构和非绝热过程演变的首次多模式比较和评价。该项目的目标是：(1)支持总体组织领导对MJOTF和GASS非绝热过程实验的贡献；(2)提供与实验的气候学部分有关的后勤和管理支助；(3)对实验的气候学部分进行初步/牵头分析。该项目的一个具体成果是，它将为提高模式保真度提供有价值的指导，以表示与MJO和相关热带现象有关的一些快速过程，包括对流、云、辐射和边界层。这种改进有可能改善亚季节性时间尺度的预报。因此，该项目具有相当广泛的影响。

Given the central role of diabatic heating in Madden-Julian Oscillation (MJO) physics and theory along with the demands for reducing model deficiencies in simulating and predicting the MJO and related phenomena, it is of great interest and urgent need to explore how MJO vertical heating structures are represented in current General Circulation Models (GCMs). To address this demand, a joint research activity has been suggested and formulated by the World Climate Research Program (WCRP) World Weather Research Program (WWRP)/THORPEX MJO Task Force (MJOTF) and the GEWEX Atmospheric System Study (GASS). The objectives of the international research activity are to characterize, compare and evaluate the heating, moistening and momentum mixing processes associated with the MJO that are produced by present-day global weather and climate models, with a focus on their vertical structure. The GASS activity represents the first multi-model comparison and evaluation of the vertical structure and evolution of diabatic processes of the MJO.The objectives of this project are to: (i) support a contribution of overall organizational leadership to the MJOTF and GASS diabatic processes experiment; (ii) provide the logistical and management support associated with the climatological component of the experiment; and (iii) undertake the initial/lead analysis of the climatological component of the experiment. A tangible outcome, of this project is that it will provide valuable guidance for improving model fidelity in representing a number of fast processes, including convection, clouds, radiation, and boundary layer, associated with the MJO and related tropical phenomena. Such improvements have the potential to improve forecasting at subseasonal time scales. Thus this project has substantial broader impacts.