气候变化领域集成服务门户(CCPortal): Equatorial Waves, Diurnal Tides and Small-Scale Thermal Variability in the Tropical Lower Stratosphere From COSMIC-2 Radio Occultation

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DOI	10.1029/2020JD033969
	Equatorial Waves, Diurnal Tides and Small-Scale Thermal Variability in the Tropical Lower Stratosphere From COSMIC-2 Radio Occultation
	Randel W.J.; Wu F.; Podglajen A.
发表日期	2021
ISSN	2169897X
卷号	126 期号:7
英文摘要	A new constellation of radio occultation satellites called COSMIC-2 (Constellation Observing System for Meteorology, Ionosphere, and Climate-2) is providing unprecedented dense measurements of the tropical atmosphere, with on average more than 4,000 high quality observations per day over 40°N–S. We use these data to evaluate large- and small-scale thermal variability in the tropical lower stratosphere during October 2019 – April 2020. Space-time spectral analysis of 6-hourly gridded COSMIC-2 data reveals a rich spectrum of traveling planetary-scale waves, including Kelvin waves, mixed Rossby-gravity waves and inertia gravity waves, in addition to propagating diurnal tides. These coherent modes show enhanced amplitudes from the tropical tropopause through the lower stratosphere (∼17–25 km). Characteristics of small-scale temperature variances, calculated as deviations from the gridded fields, reveal systematic spatial patterns including time average maxima over Africa and South America overlying frequent deep convection. Small-scale variances also exhibit transient maxima in the equatorial lower stratosphere tied to local variations in static stability, associated with large-scale Kelvin waves. The new COSMIC-2 observations provide novel details on the rich spectrum of large- and small-scale waves near and above the tropical tropopause. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	diurnal tides; equatorial waves; gravity waves; stratosphere; tropical tropopause
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/185347
作者单位	National Center for Atmospheric Research, Boulder, CO, United States; COSMIC Program, University Corporation for Atmospheric Research, Boulder, CO, United States; Laboratoire de Météorologie Dynamique, Paris, France
推荐引用方式 GB/T 7714	Randel W.J.,Wu F.,Podglajen A.. Equatorial Waves, Diurnal Tides and Small-Scale Thermal Variability in the Tropical Lower Stratosphere From COSMIC-2 Radio Occultation[J],2021,126(7).
APA	Randel W.J.,Wu F.,&Podglajen A..(2021).Equatorial Waves, Diurnal Tides and Small-Scale Thermal Variability in the Tropical Lower Stratosphere From COSMIC-2 Radio Occultation.Journal of Geophysical Research: Atmospheres,126(7).
MLA	Randel W.J.,et al."Equatorial Waves, Diurnal Tides and Small-Scale Thermal Variability in the Tropical Lower Stratosphere From COSMIC-2 Radio Occultation".Journal of Geophysical Research: Atmospheres 126.7(2021).