On the role of the Kelvin wave in the westerly phase of the semiannual zonal wind oscillation
On the role of the Kelvin wave in the westerly phase of the semiannual zonal wind oscillation
复制标题
开尔文波在半年纬向风振荡西风相中的作用
DOI：
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发表时间：
1979
期刊：
影响因子：
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通讯作者：
T. Dunkerton
中科院分区：
文献类型：
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作者：
T. Dunkerton
摘要本文定量地研究了Hirota（1978）发现的开尔文波在产生热带平流层上层半年一次纬向风振荡的西风加速中的作用。结果表明，在波参数合理的情况下，开尔文波确实可以产生观测到的加速度。对于Dickinson（1973）的热阻尼率，波数1扰动最可能的相速度范围是从45到60 m s−1。对于“光化学加速”阻尼速率（Blake和Lindzen， 1973），他需要超过70 m s - 1的相速度。准两年一次的振荡可能对半年一次的西风带有重要的调制作用。
Abstract The role of the Kelvin wave, discovered by Hirota (1978), in producing the westerly accelerations of the semiannual zonal wind oscillation in the tropical upper stratosphere is examined quantitatively. It is shown that, for reasonable values of the wave parameters, this Kelvin wave could indeed give rise to the observed accelerations. For the thermal damping rates of Dickinson (1973), the most likely range of phase speeds for a wavenumber 1 disturbance is from 45 to 60 m s−1. For “photochemically accelerated” damping rates (Blake and Lindzen, 1973), a phase speed in excess of 70 m s−1 would he required. The possibility of a significant modulation of the semiannual westerlies by the quasi-biennial oscillation is also suggested.