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首页> 外文期刊>Journal of Geophysical Research, D. Atmospheres: JGR >QBO, ENSO, and Solar Cycle Effects in Short-Term Nonmigrating Tidal Variability on Planetary Wave Timescales From SABER-An Information-Theoretic Approach
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QBO, ENSO, and Solar Cycle Effects in Short-Term Nonmigrating Tidal Variability on Planetary Wave Timescales From SABER-An Information-Theoretic Approach

机译:QBO,ENSO和太阳循环效应在短期非迁移潮汐变异性上,由Sabre的行星波时间尺度 - 一种信息 - 理论方法

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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 Ni?o-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 Ni?a 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.
机译:在划定和理解介质圈和较低的热层的“潮气气候”中取得了很大的进展,即季节性或更长的时间段的潮汐变异性。几天时间内测量值的短期潮汐变异程度较少,主要是由于卫星本地太阳能时间采样所施加的观察限制。本文提出了一种研究了16年的持续温度的“潮汐天气”的新方法。我们的重点是与源自热带对流的Zonal Wave 3(DE3)向东传播的非迁移昼夜潮汐。使用基于贝叶斯统计和时间依赖性概率密度函数的信息 - 理论方法分析了来自“潮汐解卷积”的短期潮汐变异性的统计数据。本文特别讨论了在准10天波(Q10DW)时间尺度上的短期DE3可变性的持续变化的统计特征,并将其与各种强制和传播条件相关联,例如准双年振荡(QBO),EL NI? O-Southern振荡(ENSO)和太阳循环。了解对这些驱动程序的响应需要单独处理对称和反对称DE3潮汐模式。由于增强的Q10DW活动和La Ni期间,在QBO的东方相位期间增强了对称的DE3模式可变性,因为由于增强的对流强制,因此ENSO的阶段,但由于南部的稳定极性涡流条件,因此不显示太阳循环依赖性半球。由于北半球更不稳定的极性涡流相关的Q10DW活动,在太阳能最大值期间,QBO的西部阶段增强了反对称DE3模式可变性。

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