Tropical Deep Convection at Quasi-biennial and Annual Time Scales

准两年期和年度时间尺度的热带深对流

• 批准号: 9812429
• 负责人: Matthew Hitchman
• 金额: $ 19.25万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-11-15 至 2000-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9812429&HistoricalAwards=false
• 关键词: Tropical; Deep; Convection; Quasi; biennial

The goal of this project is to ascertain the degree to which the Quasi-biennial Oscillation (QBO) of the stratosphere and tropical deep convection are related. The co-principal investigators found in a preliminary study which compared interannual variations in outgoing long-wave radiation (OLR) in the tropics with a proxy for the QBO, the stratospheric zonal winds measured at Singapore. The correlation for the 12-year period was large enough to warrant further exploration. Drs. Hitchman and Martin will extend the period of their study to 23 years and will also investigate whether regional differences can be detected. In the course of the study, they will examine a number of meteorological parameters near the tropopause with the hope of gaining insights into the possible physical mechanisms involved. They will use a variety of data sets: OLR data from several satellite instruments, Highly Reflective Cloud data, standard meteorological analyses from the European Centre for Medium Range Forecasting and reanalysis products from the National Centers for Environmental Prediction. The results of this study should provide insights into the nature of large-scale tropical convection and the possibility of using the state of the tropical stratospheric winds for long-range forecasting of tropical convection on a regional basis. The Climate Dynamics and Large-scale Dynamic Meteorology Programs jointly fund this award.

该项目的目标是确定平流层准两年一次的振荡(QBO)与热带深对流的相关程度。联合首席调查人员在一项初步研究中发现，该研究将热带地区传出长波辐射(OLR)的年际变化与在新加坡测量的平流层纬向风QBO的替代指标进行了比较。12年期间的相关性足够大，足以保证进一步勘探。希奇曼和马丁博士将把他们的研究期限延长到23年，并将调查是否可以发现地区差异。在研究过程中，他们将检查对流层顶附近的一些气象参数，希望对可能涉及的物理机制有更深入的了解。他们将使用各种数据集：几个卫星仪器的OLR数据、高反射率的云数据、欧洲中期预报中心的标准气象分析以及国家环境预报中心的再分析产品。这项研究的结果应有助于深入了解大规模热带对流的性质，以及利用热带平流层风的状态在区域基础上对热带对流进行长期预报的可能性。气候动力学和大型动力气象项目共同资助了这一奖项。