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Diurnal and intraseasonal variation of UTLS vertical wind disturbance in the equatorial region and its relation to tropospheric convective activities

机译：赤道地区UTLS垂直风扰的日，季节内变化及其与对流层对流活动的关系

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摘要

Vertical wind variations in the Upper Troposphere and Lower Stratosphere (UTLS) measured by the Equatorial Atmosphere Radar (EAR) at Kototabang, Sumatra, between 2003 and 2005 but mainly in 2004, have been statistically analyzed to study the characteristics of wind variances associated with convective activity, which is related to gravity wave generation and propagation. The analyses are intended to characterize relatively short period disturbances of less than 12 hours and an energy propagation direction of a relatively high elevation angle, and to relate vertical wind variations to convective activity close to the EAR. Correlation analyses between vertical wind variations and rainfall show that the wind variances have a clear diurnal variation indicating probable effects of tropospheric convection. They also show some intraseasonal variation. However, there are no significant correlations with the Out-going Long-wave Radiation (OLR) anomaly. The correlations between variances at UT and LS suggest that the UTLS coupling of vertical wind variation through upward propagation of gravity wave is similarly evident in the afternoon during both the active and the inactive phase of OLR that is a proxy of large-scale convective activity.
机译：由苏门答腊科托邦的赤道大气雷达（EAR）在2003年至2005年（主要是2004年）对高对流层和低平流层（UTLS）的垂直风向变化进行了统计分析，以研究与对流相关的风向变化特征活动，这与重力波的产生和传播有关。该分析旨在表征少于12小时的相对短时间扰动和相对较高仰角的能量传播方向，并将垂直风的变化与接近EAR的对流活动联系起来。垂直风向变化与降雨之间的相关分析表明，风向变化具有明显的昼夜变化，表明对流层对流的可能影响。他们还显示出一些季节内变化。但是，与外发长波辐射（OLR）异常没有显着相关性。 UT和LS方差之间的相关性表明，通过重力波的向上传播，垂直风向变化的UTLS耦合在OLR的活跃阶段和非活跃阶段的下午都是相似的，后者是大规模对流活动的代表。

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