Properties of the average distribution of equatorial Kelvin waves investigated with the GROGRAT ray tracer
Properties of the average distribution of equatorial Kelvin waves investigated with the GROGRAT ray tracer
复制标题
使用 GROGRAT 射线追踪器研究赤道开尔文波平均分布的特性
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
S. Eckermann
中科院分区：
文献类型：
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作者：
M. Ern;H. Cho;P. Preusse;S. Eckermann
抽象的。对流层对流激发的Kelvin波被认为是平流层准两年振荡（QBO）的主要驱动力之一。本文利用联合收割机的重力波区域或全球射线跟踪仪（GRIGRAT），结合几组实测资料，研究了Kelvin波的强迫和垂直传播。射线示踪剂在对流层高度的发射分布是根据欧洲中期天气预报中心（ECMWF）业务分析的时空谱以及热带降雨测量使命任务（TRMM）卫星测量的向外长波辐射（OLR）和降雨量数据推导出来的。将所得平流层开尔文波谱与ECMWF业务分析和使用宽带发射辐射测量（SABER）卫星仪器探测大气的温度测量结果进行比较。讨论的问题如下：源变率与风调制的相对重要性、辐射和湍流阻尼与波浪破碎的相对重要性以及自由传播的波浪支配频谱的最小高度。
Abstract. 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.