Effects of Background Wind on the Eastward Propagation of Madden Julian Oscillation (MJO)

背景风对马登朱利安振荡（MJO）东向传播的影响

基本信息

批准号：
1757342
负责人：
Paul Roundy
金额：
$ 35.76万
依托单位：
SUNY at Albany
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-05-01 至 2023-04-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1757342&HistoricalAwards=false
关键词：
Effects Background Wind Eastward Propagation

项目摘要

The Madden Julian Oscillation (MJO) is referred to organized large-scale tropical convection system that slowly propagate eastward with an average time scale of 40-60 days around the equator. As they do so, they influence global weather patterns. One of the questions that remains to be understood fully is why some of these events move faster or slower than others. This project aims to explain part of the variability in the eastward propagating speed of MJO by linking it to slowly evolving background winds. Through analysis of observed and model data, this project will identify how these background winds alter the movements of the regions of tropical rainfall and the associated global weather patterns. A unique combination of statistics and the background momentum budget analyses will help to isolate the roles of tropical intrusion of extratropical disturbances in regulating the background wind system and thereby inter-event variations of eastward propagating speeds of MJO.Weather models do not predict well how these tropical rainfall patterns evolve. The improved understanding of how MJO interacts with the global weather would help improve weather forecasting in the important period for decision, 2-5 weeks into the future. Better understanding how these background wind patterns influence MJO's propagation also help identify error sources of existing numerical weather prediction models. Graduate students will be trained to perform research activities and will present papers at conferences and submit results for peer review.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

Madden Julian振荡（MJO）被称为有组织的大规模热带对流系统，该系统在赤道周围以40-60天的平均时间尺度缓慢地向东传播。这样做会影响全球天气模式。尚待充分理解的问题之一是，为什么其中一些事件的移动速度比其他事件更快或慢。该项目旨在通过将其链接到缓慢发展的背景风，来解释MJO向东传播速度的变化。通过分析观察到的数据和模型数据，该项目将确定这些背景风如何改变热带降雨区域的运动和相关的全球天气模式。统计数据和背景动量预算分析的独特组合将有助于隔离热带干扰在调节背景风系统中的热带侵入的作用，从而隔离MJO模型的向东传播速度的事实变化。Weather模型并不能很好地预测这些热带降雨模式如何发展。对MJO如何与全球天气相互作用的改进理解将有助于改善在未来2-5周的决定时期的重要时期的天气预测。更好地了解这些背景风模式如何影响MJO的传播也有助于确定现有数值天气预测模型的错误来源。研究生将接受培训以进行研究活动，并将在会议上介绍论文并提交同行评审结果。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛影响的评估评估标准来评估值得支持的。