气候变化领域集成服务门户(CCPortal): Migrating Semidiurnal Tide During the September Equinox Transition in the Northern Hemisphere

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DOI	10.1029/2020JD033822
	Migrating Semidiurnal Tide During the September Equinox Transition in the Northern Hemisphere
	Pedatella N.M.; Liu H.-L.; Conte J.F.; Chau J.L.; Hall C.; Jacobi C.; Mitchell N.; Tsutsumi M.
发表日期	2021
ISSN	2169897X
卷号	126 期号:3
英文摘要	Specified Dynamics Whole Atmosphere Community Climate Model with thermosphere-ionosphere eXtension simulations are used to investigate the solar migrating semidiurnal tide (SW2) around September equinox at middle to high latitudes in the Northern Hemisphere. A pronounced minimum in SW2 occurs around September equinox, and is characterized by a ∼50% reduction in tidal amplitudes for 20–30 days. Analysis of the simulation results indicates that the SW2 minimum occurs due to the seasonal transition of the zonal mean zonal winds, which alter the generation and propagation of different symmetric and antisymmetric modes of SW2. In particular, the antisymmetric modes notably decrease due to the more hemispherically symmetric zonal winds around equinox. It is further demonstrated that interannual variability in the timing of the SW2 minimum is related to the timing of the seasonal transition of the zonal mean zonal winds in the middle atmosphere. This leads to an earlier occurrence of the SW2 minimum during years when the seasonal transition occurs earlier, such as the recent 2019 September equinox which saw an earlier transition of the Southern Hemisphere zonal mean zonal winds following the occurrence of a sudden stratosphere warming. The connection between the timing of the SW2 minimum in the Northern Hemisphere and the timing of the seasonal transition in the middle atmosphere winds is confirmed by seasonal variability of 12-h tides deduced from specular meteor radar observations at middle to high latitudes in the Northern Hemisphere. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	mesosphere; semidiurnal tide; whole atmosphere model
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/185511
作者单位	High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, United States; COSMIC Program Office, University Center for Atmospheric Research, Boulder, CO, United States; Leibniz Institute of Atmospheric Physics, Rostock University, Kühlungsborn, Germany; Tromsø Geophysical Observatory, The Arctic University of Norway, Tromsø, Norway; Institute for Meteorology, Universität Leipzig, Leipzig, Germany; Department of Electronic and Electrical Engineering, University of Bath, Bath, United Kingdom; British Antarctic Survey, Cambridge, United Kingdom; National Institute of Polar Research, Tokyo, Japan
推荐引用方式 GB/T 7714	Pedatella N.M.,Liu H.-L.,Conte J.F.,et al. Migrating Semidiurnal Tide During the September Equinox Transition in the Northern Hemisphere[J],2021,126(3).
APA	Pedatella N.M..,Liu H.-L..,Conte J.F..,Chau J.L..,Hall C..,...&Tsutsumi M..(2021).Migrating Semidiurnal Tide During the September Equinox Transition in the Northern Hemisphere.Journal of Geophysical Research: Atmospheres,126(3).
MLA	Pedatella N.M.,et al."Migrating Semidiurnal Tide During the September Equinox Transition in the Northern Hemisphere".Journal of Geophysical Research: Atmospheres 126.3(2021).