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SGER: Stratosphere-Troposphere Transfer of the Zonal Angular Momentum Associated with the Global Mass Circulation

SGER：与全球质量环流相关的纬向角动量的平流层-对流层转移

基本信息

批准号：
0741357
负责人：
Ming Cai
金额：
$ 5.01万
依托单位：
Florida State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2008
资助国家：
美国
起止时间：
2008-01-01 至 2008-12-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0741357&HistoricalAwards=false
关键词：
SGER Stratosphere Troposphere Transfer Zonal

项目摘要

Recent observational studies reveal that changes in the wintertime stratospheric circulation are followed by changes in the troposphere. This apparent downward influence is an active area of research. Under this Small Grant for Exploratory Research (SGER), Cai will investigate the dynamics of troposphere-stratosphere coupling in an unconventional framework, analyzing the mass circulation using the potential temperature as the vertical coordinate. Terms in the zonal mean angular-momentum balance will be calculated from daily analyses. The results will be used to explore the mechanisms responsible for the poleward and downward propagation of angular momentum anomalies in the stratosphere and, as revealed in Cai's recent published work, their equatorward propagation near Earth's surface. The results will provide a preliminary test of Cai's controversial hypothesis that the propagation of these features results from their advection by a global mass circulation that is ultimately driven by heating. Broader impacts of this work are in its potential implication for predictability on extended timescales, since the angular momentum anomalies take about 50 days to propagate in the stratospheres from the tropics to high latitudes, and then opposite signed anomalies take about the same amount of time to propagate in the troposphere from high latitudes to the subtropics. A graduate student and a post-doc will participate in the research.

最近的观测研究表明，冬季平流层环流的变化会引起对流层的变化。这种明显的下行影响是一个活跃的研究领域。根据这项探索性研究小额资助（SGER），蔡将在非常规框架中研究对流层-平流层耦合的动力学，使用位温作为垂直坐标分析质量环流。纬向平均角动量平衡中的项将根据每日分析计算。其结果将用于探索同温层角动量异常向极和向下传播的机制，以及Cai最近发表的工作中揭示的它们在地球表面附近向赤道传播的机制。这些结果将提供一个初步的测试蔡的有争议的假设，传播这些功能的结果，从他们的平流由全球质量环流，最终是由加热驱动。这项工作的更广泛影响在于其对延长时间尺度上的可预测性的潜在影响，因为角动量异常需要大约50天才能在平流层从热带传播到高纬度，然后相反符号的异常需要大约相同的时间在对流层从高纬度传播到亚热带。一名研究生和一名博士后将参与这项研究。