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Properties of the average distribution of equatorial Kelvin waves investigated with the GROGRAT ray tracer

机译：用GROGRAT射线示踪剂研究赤道开尔文波的平均分布特性

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摘要

Kelvin waves excited by tropospheric convection are considered to be one of the main drivers of the stratospheric quasi-biennial oscillation (QBO). In this paper we combine several measured data sets with the Gravity wave Regional Or Global RAy Tracer (GROGRAT) in order to study the forcing and vertical propagation of Kelvin waves. Launch distributions for the ray tracer at tropospheric altitudes are deduced from space-time spectra of European Centre for Medium-Range Weather Forecasts (ECMWF) operational analyses, as well as outgoing longwave radiation (OLR) and rainfall data measured by the Tropical Rainfall Measuring Mission (TRMM) satellite. The resulting stratospheric Kelvin wave spectra are compared to ECMWF operational analyses and temperature measurements of the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) satellite instrument. Questions addressed are: the relative importance of source variability versus wind modulation, the relative importance of radiative and turbulent damping versus wave breaking, and the minimum altitude where freely propagating waves dominate the spectrum.
机译：对流层对流激发的开尔文波被认为是平流层准每两年一次振荡（QBO）的主要驱动力之一。在本文中，我们结合重力波区域或全球RAy示踪剂（GROGRAT）组合了几个测量数据集，以研究开尔文波的强迫和垂直传播。根据欧洲中距离天气预报中心（ECMWF）运营分析的时空光谱，以及热带雨量测量团测量的外向长波辐射（OLR）和降雨数据，推导出对流层高度处的射线示踪剂的发射分布（TRMM）卫星。使用宽带发射辐射法（SABER）卫星仪器，将得到的平流层开尔文波谱与ECMWF运行分析和大气探测的温度测量值进行比较。解决的问题是：源可变性与风调制的相对重要性，辐射和湍流阻尼与碎波的相对重要性，以及自由传播波主导频谱的最小高度。

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