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Rossby Waves Entering the Equatorial Middle Atmosphere

罗斯比波进入赤道中层大气

基本信息

批准号：
8918574
负责人：
Matthew Hitchman
金额：
$ 18.96万
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：
1990
资助国家：
美国
起止时间：
1990-01-01 至 1993-12-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=8918574&HistoricalAwards=false
关键词：
Rossby Waves Entering Equatorial Middle

项目摘要

Extratropical planetary Rossby waves are known to propagate energy upward and equatorward from their tropospheric source region. Much of this wave activity reaches the equatorial middle atmosphere, where relatively little is known about its fate. Satellite data reveal that, around the solstices, when the equatorial middle atmosphere is inertially unstable, vertically layered disturbances (so-called "pancake structures") appear over the equator, but only when a burst of Rossby wave activity is impinging on the region. In this fundamental hydrodynamic study, the PI will use a high vertical resolution middle atmosphere version of the National Center for Atmospheric Research (NCAR) Community Climate Model (CCM) to test the hypothesis that the pancake structures are caused by Rossby waves entering an inertially unstable region. A hierarchy of experiments will be performed in which high latitude wave forcing is controlled and the mean flow is specified successively to be inertially stable, inertially unstable, and finally allowed to evolve with the wave field. In addition to gaining insight into the fate of Rossby waves at low latitudes, this study will improve understanding of interhemispheric tracer transport. Cross-equatorial transport diagnosed in the CCM will be parameterized in a two-dimensional middle atmosphere assessment model currently used to model ozone distribution.

外行星Rossby波已知从对流层向上和向赤道传播能量源区。这种波活动的大部分到达赤道中层大气，相对而言知之甚少关于它的命运卫星数据显示，至日，当赤道中层大气惯性不稳定的垂直分层扰动（所谓的“煎饼结构”）出现在赤道，但只有当一个突发的罗斯贝波活动正在冲击这个区域。在这基本的水动力学研究，PI将使用高垂直分辨率中大气版本的国家中心大气研究（NCAR）社区气候模式（CCM）测试假设，煎饼结构是由 Rossby波进入惯性不稳定区。一将进行分层实验，其中高纬度波强迫是受控的，平均气流是连续指定为惯性稳定的，惯性稳定的不稳定，最终允许随波场演化。除了深入了解罗斯比波的命运，低纬度地区，这项研究将提高对半球间示踪剂运输越赤道输送在CCM中诊断的疾病将在二维中层大气目前用于模拟臭氧分布的评估模型。