气候变化领域集成服务门户(CCPortal): A Hemispheric and Seasonal Comparison of Tropospheric to Mesospheric Gravity-Wave Propagation

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DOI	10.1029/2021JD034990
	A Hemispheric and Seasonal Comparison of Tropospheric to Mesospheric Gravity-Wave Propagation
	Alexandre D.; Thurairajah B.; England S.L.; Cullens C.Y.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:18
英文摘要	Deep convection from monsoons has been shown to be a major tropospheric source of gravity waves (GWs) in the summer hemisphere. These GWs can propagate up to the upper mesosphere, either vertically (over the same latitude) or obliquely (latitudinal propagation away from their source), where they dissipate and release their momentum. These waves play an important role in the global dynamical structure of the middle atmosphere. Understanding their hemispheric and seasonal variations could improve the GW parameterization schemes in present global models. To this end, this paper reports on a GW ray-tracing analysis using the GROGRAT model to simulate the propagation of GWs from the monsoon regions in the northern and the southern hemispheres during both the summer and the winter seasons. The 20 simulations show the southern hemisphere to be more conducive to both the vertical and the oblique propagation of mesospheric GWs compared to the northern hemisphere, regardless of season. This is partially due to a stronger GW filtering in the northern hemisphere near the tropopause where a third of the waves have been vertically reflected. We also show that an increase in the horizontal wavelength increases not only the latitudinal component but also the longitudinal component of the oblique propagation of GWs. The broad spectrum of waves with different horizontal wavelengths and horizontal phase speeds used in this study highlights the existence of an upper limit in the horizontal wavelength of GWs that can reach the upper mesosphere. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	gravity waves; hemispheric comparison; monsoon convection; oblique propagation; ray tracing; seasonal comparison
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/237000
作者单位	Kevin T. Crofton Department of Aerospace and Ocean Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States; Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States; Berkeley Institute for Data Science, University of California Berkeley, Berkeley, CA, United States
推荐引用方式 GB/T 7714	Alexandre D.,Thurairajah B.,England S.L.,et al. A Hemispheric and Seasonal Comparison of Tropospheric to Mesospheric Gravity-Wave Propagation[J],2021,126(18).
APA	Alexandre D.,Thurairajah B.,England S.L.,&Cullens C.Y..(2021).A Hemispheric and Seasonal Comparison of Tropospheric to Mesospheric Gravity-Wave Propagation.Journal of Geophysical Research: Atmospheres,126(18).
MLA	Alexandre D.,et al."A Hemispheric and Seasonal Comparison of Tropospheric to Mesospheric Gravity-Wave Propagation".Journal of Geophysical Research: Atmospheres 126.18(2021).