The Propagation and Breaking of Atmospheric Rossby Waves and Their Effects on the General Circulation

大气罗斯贝波的传播和破碎及其对大气环流的影响

• 批准号: 9908883
• 负责人: Gudrun Magnusdottir
• 金额: $ 31.93万
• 依托单位: University of California-Irvine
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-08-01 至 2003-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9908883&HistoricalAwards=false
• 关键词: Propagation; Breaking; Atmospheric; Rossby; Waves

Rossby waves play a major role in the motions that determine the Earth's general atmospheric circulation and weather patterns, but many aspects of Rossby-wave dynamics are still poorly understood. Under this award, Dr. Magnusdottir will explore how regions of Rossby wave breaking, where potential vorticity is mixed and nonlinear processes must be taken into account, affect the basic flow. While the emphasis will be on the upper troposphere in the lower latitudes, the stratosphere and stratosphere-troposphere interactions will be considered as well. In particular, the roles of the Hadley circulation on Rossby wave propagation and breaking and of Rossby wave drag will be examined. The study will employ a hierarchy of models, from simple theoretical models to complex general circulation models.In addition, the principal investigator will examine the dynamical influence of the stratosphere on tropospheric flow will be examined with a numerical model. Recent work suggests the stratosphere may have a more significant influence on short time scales than previously thought. Finally, as time permits, Dr. Magnusdottir will expand upon some preliminary work looking at the effect of higher sea surface temperatures on the atmospheric circulation at low latitudes.

罗斯贝波在决定地球大气环流和天气模式的运动中起着重要作用，但罗斯贝波动力学的许多方面仍然知之甚少。 根据该奖项，Magnusdottir博士将探索Rossby波破碎区域如何影响基本流，其中位涡混合且必须考虑非线性过程。 虽然重点将放在低纬度的对流层上层，但也将考虑平流层和平流层-对流层的相互作用。 特别是，将研究哈德利环流对罗斯比波传播和破碎以及罗斯比波阻力的作用。 这项研究将采用一系列模型，从简单的理论模型到复杂的大气环流模型，此外，首席研究员将研究平流层对对流层流动的动力学影响。 最近的研究表明，平流层在短时间尺度上的影响可能比以前认为的更重要。 最后，在时间允许的情况下，Magnusdottir博士将扩大一些初步工作，研究高海面温度对低纬度大气环流的影响。