African Easterly Waves and Their Interactions with Clouds and Convection

非洲东风波及其与云和对流的相互作用

• 批准号: 0138290
• 负责人: Christopher Thorncroft
• 金额: $ 37.41万
• 依托单位: SUNY at Albany
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-04-01 至 2006-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0138290&HistoricalAwards=false
• 关键词: African; Easterly; Waves; Their; Interactions

Recognizing the important role the African easterly waves (AEWs) play in forecasts ranging from daily to seasonal, this project seeks to understand the evolution of AEWs and their interactions with convection. The first part of the research is to obtain the statistical relationships in these interactions at various phases in the life cycle of AEWs and to investigate the physical processes involved in them using the ECMWF analyses, satellite data, radiosonde data and raingauge data. The study will then be enhanced through a case-study approach following the evolution of individual AEWs and their interactions with convection. The third part, albeit at a lower priority, is to investigate the intra-seasonal to inter-annual variability of the relationships that exist between the AEWs, the African easterly jets, and tropical convection. An important goal is to understand and gain knowledge of the precursors of Atlantic tropical cyclones through the interactions of the AEWs and tropical convection. If a conceptual model can be developed for the preconditioning for tropical cyclogenesis, it would be very valuable for the prediction community. The PI is actively involved in planning the international Western African Monsoon (WAM) experiment to be held in 2004/2005. The research from this grant will contribute to the planning of the WAM field experiment.

认识到非洲东风波（AEWs）在从日常到季节性的预报中发挥的重要作用，该项目旨在了解AEWs的演变及其与对流的相互作用。研究的第一部分是获得这些相互作用的统计关系，在不同阶段的AEW的生命周期和调查的物理过程中涉及使用ECMWF分析，卫星数据，无线电探空仪数据和雨量计数据。然后，将通过个案研究的方法，加强个别AEW的演变及其与对流的相互作用的研究。第三部分，虽然在一个较低的优先级，是调查的季节内年际变化之间的关系，存在的AEW，非洲东风急流，热带对流。一个重要的目标是通过AEW和热带对流的相互作用来了解和获得大西洋热带气旋前兆的知识。如果能发展出一个概念性的热带气旋生成预处理模式，将对预报界有很大的参考价值。 PI积极参与规划将于2004/2005年举行的国际西非季风（WAM）实验。这项研究将有助于WAM实地实验的规划。

项目成果

The Influence of Convectively Coupled Kelvin Waves on African Easterly Waves in a Wave-Following Framework

波浪跟踪框架中对流耦合开尔文波对非洲东风波的影响

• DOI: 10.1175/mwr-d-21-0321.1
• 发表时间: 2022
• 期刊: Monthly Weather Review
• 影响因子: 3.2
• 作者: Lawton, Quinton A.;Majumdar, Sharanya J.;Dotterer, Krista;Thorncroft, Christopher;Schreck, Carl J.
• 通讯作者: Schreck, Carl J.