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

大气环流模型中的马登-朱利安振荡：与其引发、维持和抑制相关的因素分析

• 批准号: 0224559
• 负责人: David Randall
• 金额: $ 15万
• 依托单位: Colorado State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-12-15 至 2005-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0224559&HistoricalAwards=false
• 关键词: Madden; Julian; Oscillation; General; Circulation

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.

该项目将改善气候模型中季节内变异性的建模。 Madden-Julian振荡（MJO）是季节内变异性的关键组成部分，在调节全球热带和亚热带地区的循环和降水变异性中起着重要作用。 MJO还影响亚洲 - 澳大利亚夏季季风，甚至可能会发生ENSO变异性。 当前的气候模型在模拟MJO变异性方面明显不足。 由于被夹在两个显着波动的时间刻度之间，时间尺度较短，时间尺度较长的季节性到年龄变化，直到最近才受到大量的研究关注。 博士。 Randall，Demott和Khairoutdinov（来自科罗拉多州立大学）将在气候模型中研究MJO变异性的启动和演变，在该气候模型中，云得以解决（而不是参数化）。 NCAR社区气候系统模型（CCSM）将实施云解决方案。 项目任务将包括完善此方案，并确定MJO模拟对实施各个方面的敏感性。 PI将开发针对MJO变异性的诊断分析软件包，并使其可通过CCSM网站提供社区使用。