气候变化领域集成服务门户(CCPortal): Secondary Gravity Waves Generated by Breaking Mountain Waves Over Europe

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DOI	10.1029/2019JD031662
	Secondary Gravity Waves Generated by Breaking Mountain Waves Over Europe
	Heale C.J.; Bossert K.; Vadas S.L.; Hoffmann L.; Dörnbrack A.; Stober G.; Snively J.B.; Jacobi C.
发表日期	2020
ISSN	2169897X
卷号	125 期号:5
英文摘要	A strong mountain wave, observed over Central Europe on 12 January 2016, is simulated in 2D under two fixed background wind conditions representing opposite tidal phases. The aim of the simulation is to investigate the breaking of the mountain wave and subsequent generation of nonprimary waves in the upper atmosphere. The model results show that the mountain wave first breaks as it approaches a mesospheric critical level creating turbulence on horizontal scales of 8–30 km. These turbulence scales couple directly to horizontal secondary waves scales, but those scales are prevented from reaching the thermosphere by the tidal winds, which act like a filter. Initial secondary waves that can reach the thermosphere range from 60 to 120 km in horizontal scale and are influenced by the scales of the horizontal and vertical forcing associated with wave breaking at mountain wave zonal phase width, and horizontal wavelength scales. Large-scale nonprimary waves dominate over the whole duration of the simulation with horizontal scales of 107–300 km and periods of 11–22 minutes. The thermosphere winds heavily influence the time-averaged spatial distribution of wave forcing in the thermosphere, which peaks at 150 km altitude and occurs both westward and eastward of the source in the 2 UT background simulation and primarily eastward of the source in the 7 UT background simulation. The forcing amplitude is ~2× that of the primary mountain wave breaking and dissipation. This suggests that nonprimary waves play a significant role in gravity waves dynamics and improved understanding of the thermospheric winds is crucial to understanding their forcing distribution. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Gravity Waves; LES; Mountain Waves; Secondary gravity waves
语种	英语
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/186132
作者单位	Center for Space and Atmospheric Research (CSAR), Embry-Riddle Aeronautical University, Daytona Beach, FL, United States; Department of Electrical & Computer Engineering, University of Alaska, Fairbanks, AK, United States; NorthWest Research Associates, Inc., Boulder, CO, United States; Jülich Supercomputing Centre, Forschungszentrum Jülich, Jülich, Germany; DLR, Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany; Institute of Applied Physics, University of Bern, Bern, Switzerland; Institute for Meteorology, University of Leipzig, Leipzig, Germany
推荐引用方式 GB/T 7714	Heale C.J.,Bossert K.,Vadas S.L.,et al. Secondary Gravity Waves Generated by Breaking Mountain Waves Over Europe[J],2020,125(5).
APA	Heale C.J..,Bossert K..,Vadas S.L..,Hoffmann L..,Dörnbrack A..,...&Jacobi C..(2020).Secondary Gravity Waves Generated by Breaking Mountain Waves Over Europe.Journal of Geophysical Research: Atmospheres,125(5).
MLA	Heale C.J.,et al."Secondary Gravity Waves Generated by Breaking Mountain Waves Over Europe".Journal of Geophysical Research: Atmospheres 125.5(2020).