气候变化领域集成服务门户(CCPortal): Formation of a Mesospheric Inversion Layer and the Subsequent Elevated Stratopause Associated With the Major Stratospheric Sudden Warming in 2018/19

CCPortal

DOI	10.1029/2021JD034681
	Formation of a Mesospheric Inversion Layer and the Subsequent Elevated Stratopause Associated With the Major Stratospheric Sudden Warming in 2018/19
	Okui H.; Sato K.; Koshin D.; Watanabe S.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:18
英文摘要	Since 2004, following prolonged stratospheric sudden warming (SSW) events, it has been observed that the stratopause disappeared and reformed at a higher altitude, forming an elevated stratopause (ES). The relative roles of atmospheric waves in the mechanism of ES formation are still not fully understood. We performed a hindcast of the 2018/19 SSW event using a gravity-wave (GW) permitting general circulation model that resolves the mesosphere and lower thermosphere (MLT) and analyzed dynamical phenomena throughout the entire middle atmosphere. An ES formed after the major warming on January 1, 2019. There was a marked temperature maximum in the polar upper mesosphere around December 28, 2018 prior to the disappearance of the descending stratopause associated with the SSW. This temperature structure is referred to as a mesospheric inversion layer (MIL). We show that adiabatic heating from the residual circulation driven by GW forcing (GWF) causes barotropic and/or baroclinic instability before the MIL formation, causing in situ generation of planetary waves (PWs). These PWs propagate into the MLT and exert negative (westward) forcing, which contributes to the MIL formation. Both GWF and PW forcing (PWF) above the recovered eastward jet play crucial roles in ES formation. The altitude of the recovered eastward jet, which regulates GWF and PWF height, is likely affected by the MIL structure. Simple vertical propagation from the lower atmosphere is insufficient to explain the presence of the GWs observed in this event. © 2021. The Authors.
英文关键词	0342 middle atmosphere: energy deposition; 3332 mesospheric dynamics; 3334 middle atmosphere dynamics; 3363 stratospheric dynamics; 3389 tides and planetary waves; elevated stratopause; gravity waves; mesospheric inversion layer; middle atmosphere; planetary waves; stratospheric sudden warming
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/236987
作者单位	Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo, Japan; Japan Agency for Marine–Earth Science and Technology, Yokohama, Japan
推荐引用方式 GB/T 7714	Okui H.,Sato K.,Koshin D.,et al. Formation of a Mesospheric Inversion Layer and the Subsequent Elevated Stratopause Associated With the Major Stratospheric Sudden Warming in 2018/19[J],2021,126(18).
APA	Okui H.,Sato K.,Koshin D.,&Watanabe S..(2021).Formation of a Mesospheric Inversion Layer and the Subsequent Elevated Stratopause Associated With the Major Stratospheric Sudden Warming in 2018/19.Journal of Geophysical Research: Atmospheres,126(18).
MLA	Okui H.,et al."Formation of a Mesospheric Inversion Layer and the Subsequent Elevated Stratopause Associated With the Major Stratospheric Sudden Warming in 2018/19".Journal of Geophysical Research: Atmospheres 126.18(2021).