QBO and Pinatubo signals in the mass flux at 100 hPa and stratospheric circulation
QBO and Pinatubo signals in the mass flux at 100 hPa and stratospheric circulation
复制标题
100 hPa 质量通量和平流层环流中的 QBO 和 Pinatubo 信号
DOI：
10.1029/98gl01295
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
K. Yamazaki
中科院分区：
文献类型：
--
作者：
Dong;K. Yamazaki
剩余平均纬向环流由转换的欧拉平均（TEM）动量和连续性方程计算，从1988年12月到1995年11月。我们的方法不依赖于辐射计算。由南、北方半球的热带外向下质量通量估算了100 hPa上的热带向上质量通量。利用多元回归统计模型定量地获得了准两年振荡（QBO）的信号和趋势。结果表明，热带向上的质量通量在QBO东风相增强，在QBO西风相减弱。作为残差，检测到1991年6月皮纳图博火山爆发的信号。这反映了喷发后气溶胶对平流层下部残余环流的影响。在1991年下半年，质量流量突然增加，并在1993年底停止增加，约2.5年后的爆发。
The residual mean meridional circulation is calculated by the transformed Eulerian‐mean (TEM) momentum and continuity equations for the period from December 1988 to November 1995. Our method does not rely on radiative calculations. The tropical upward mass flux at 100 hPa is estimated from the extratropical downward mass fluxes in the southern and northern hemispheres. The multiple regression statistical model is used to obtain quantitatively the signal of the quasi‐biennial oscillation (QBO) and the trend. The results show that the tropical upward mass flux is enhanced during QBO easterly phase and reduced during QBO westerly phase. As a residual, the signal of Mount Pinatubo volcanic eruption in June 1991 is detected. This reflects the aerosol effects to the residual circulation in the lower stratosphere after the eruption. An abrupt increase of the mass flux is shown in the latter half of 1991, and the increase ceases at the end of 1993, about 2.5 years after the eruption.