Studies on the eguatorial middle atmosphere dynamics.

利用新加坡（北纬104度）1978 - 1993年15年的气球观测资料，对赤道平流层下部的短周期扰动进行了统计分析。据发现，具有约2天的周期的内波是独立于著名的长周期波，如开尔文波和Rossby重力波占主导地位。利用1992年1月至1993年5月的UARS-CLAES观测资料，研究了赤道平流层下部大气温度的时空变化。在此期间，明显的证据开尔文波观察到的纬向波数1温度异常的东进。Kelvin波在QBO的东风区活动强烈，而在西风区迅速减弱。本文从理论和数值上研究了热带大气对瞬态局部加热的响应。用分离变量法对线性化原始方程进行了分析。依赖的波激励的加热的几个参数上澄清。本文还利用一个全非线性模式的时间积分和精确的辐射计算，研究了在某些气候基本态中激发波的传播，这些基本态包括两个相反的QBO位相，并在同样大小的装置上对Plumb和McEwan（1978）的QBO实验进行了双重检验。证实了平均流的形成及其逆转。反转周期对波源狭窄区域的层结非常敏感，变化显著。

A statistical analysis was carried out of short-period disturbances in the equatorial lower stratosphere, with use of balloon observations at Singapore (lN,104E) for 15 years of 1978 - 1993. It is found that internal waves having a period of about 2 days are dominant independently from the well-known longer-period waves such as Kelvin waves and Rossby-gravity waves. Results of long-term statistics show that these short-period waves are strongly connected with the QBO.Space-time variations of atmospheric temperature in the equatorial lower stratosphere ax investigated using temperature data derived from UARS-CLAES observations for January 1992 to May 1993. During this period, clear evidence of Kelvin waves is observed for eastward progression of zonal wavenumber 1 temperature anomalies. The Kelvin wave activity is vigorous during the easterly regime, but rapidly decreases in the westerly regime of the QBO.Response of the atmosphere to transient localized heating in the tropics is studied theoretically and nemerically. The method of separation of variables is used to analyze the linearized primitive equations. Dependence of the wave excitation on several parameters of the heating is clarified. Time-integrations of a full nonlinear model with accurate radiative calculations are also done to investigate the propagation of excited waves in some climatological basic states including two opposite QBO phases.Laboratory experiment of QBO done by Plumb and McEwan (1978) was double cheked using same size of apparatus. The formation of mean flow and its reverse were confirmed. The period of reverse, however, was very sensitive to the stratification of narrow region at the source of wave, and varied significantly.