The Madden-Julian Oscillation in General Circulation Models: An Analysis of Factors Relevant to Its Initiation, Maintenance, and Suppression

该项目将改进气候模型中季节内变化的建模。 马登-朱利安振荡（MJO）是季节内变化的重要组成部分，对全球热带和副热带地区的环流和降水变化具有重要的调节作用。 MJO还影响亚洲-澳大利亚夏季风，甚至可能影响ENSO变率。 目前的气候模式在模拟MJO变率方面存在明显不足。 由于夹在两个显着的波动时间尺度-较短的时间尺度的天气和较长的时间尺度的季节到年际变化-MJO没有得到显着的研究关注，直到最近。 Randall、Demott和Khairoutdinov博士（均来自科罗拉多州立大学）将在一个云被解析（而非参数化）的气候模型中研究MJO变率的启动和演变。 云解析方案将在NCAR社区气候系统模型（CCSM）中实施。 项目任务将包括完善该方案，并确定MJO模拟对实施的各个方面的敏感性。 PI将开发针对MJO变异性的诊断分析包，并通过CCSM网站提供给社区使用。

The project will improve the modeling of intra-seasonal variability in climate models. The Madden-Julian Oscillation (MJO) is a key component of intra-seasonal variability, and plays a significant role in modulating circulation and precipitation variability in the global Tropics and subtropical regions. MJO also influences the Asian-Australian summer monsoons and possibly even ENSO variability. Current climate models are notably deficient in simulating MJO variability. Because of being sandwiched between two notable fluctuation time-scales-the shorter time-scale weather and the longer time-scale seasonal-to-interannual variability-MJO has not received significant research attention until recently. Drs. Randall, Demott and Khairoutdinov (all from Colorado State University) will investigate the initiation and evolution of MJO variability in a climate model in which clouds are resolved (and not parameterized). A cloud-resolving scheme will be implemented in the NCAR Community Climate System Model (CCSM). Project tasks will include refining this scheme, and ascertaining the sensitivity of MJO simulation to various aspects of the implementation. The PIs will develop a diagnostic analysis package targeting MJO variability, and make it available for community use through the CCSM web site.