气候变化领域集成服务门户(CCPortal): QBO, ENSO, and Solar Cycle Effects in Short-Term Nonmigrating Tidal Variability on Planetary Wave Timescales From SABER

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DOI	10.1029/2019JD031910
	QBO, ENSO, and Solar Cycle Effects in Short-Term Nonmigrating Tidal Variability on Planetary Wave Timescales From SABER—An Information-Theoretic Approach
	Kumari K.; Oberheide J.
发表日期	2020
ISSN	2169897X
卷号	125 期号:6
英文摘要	Much progress has been made in delineating and understanding the “tidal climate” of the mesosphere and lower thermosphere, that is, tidal variability on seasonal or longer timescales. Short-term tidal variability on timescales of a few days is much less understood, mainly due to observational constraints imposed by satellite local solar time sampling. This paper presents a new approach to study the “tidal weather” in 16 years of SABER temperatures. Our focus is on the eastward-propagating nonmigrating diurnal tide with zonal wave number 3 (DE3) that originates from tropical convection. The statistics of short-term tidal variability derived from “tidal deconvolution” are analyzed using an information-theoretic approach based on Bayesian statistics and time-dependent probability density functions. The paper particularly discusses the statistical characteristics of interannual changes in short-term DE3 variability on a quasi-10-day wave (Q10DW) timescale and relates it to various forcing and propagation conditions such as Quasi-Biennial Oscillation (QBO), El Niño-Southern Oscillation (ENSO), and solar cycle. Understanding the response to these drivers requires a separate treatment of symmetric and antisymmetric DE3 tidal modes. Symmetric DE3 mode variability is enhanced during the easterly phase of the QBO due to enhanced Q10DW activity and during the La Niña phase of ENSO due to enhanced convective forcing but does not show a solar cycle dependence because of stable polar vortex conditions in the southern hemisphere. Antisymmetric DE3 mode variability is enhanced in the westerly phase of the QBO during solar maximum due to Q10DW activity related to a more unstable polar vortex in the northern hemisphere. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	ENSO; information theory; planetary waves; QBO; short-term tidal variability; solar cycle
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/186084
作者单位	Department of Physics and Astronomy, Clemson University, Clemson, SC, United States
推荐引用方式 GB/T 7714	Kumari K.,Oberheide J.. QBO, ENSO, and Solar Cycle Effects in Short-Term Nonmigrating Tidal Variability on Planetary Wave Timescales From SABER—An Information-Theoretic Approach[J],2020,125(6).
APA	Kumari K.,&Oberheide J..(2020).QBO, ENSO, and Solar Cycle Effects in Short-Term Nonmigrating Tidal Variability on Planetary Wave Timescales From SABER—An Information-Theoretic Approach.Journal of Geophysical Research: Atmospheres,125(6).
MLA	Kumari K.,et al."QBO, ENSO, and Solar Cycle Effects in Short-Term Nonmigrating Tidal Variability on Planetary Wave Timescales From SABER—An Information-Theoretic Approach".Journal of Geophysical Research: Atmospheres 125.6(2020).