Yanai波群通过WISHE诱导的对流对赤道大气中慢MJO类开尔文波的激发
Excitation of slow MJO-like Kelvin waves in the equatorial atmosphere by Yanai wave-group via WISHE-induced convection
摘要：
季节内麦登-朱利安振荡（MJO）涉及热带大气中缓慢向东传播的信号，它显著影响气候，尽管理论和观测取得了重大进展，但尚未得到很好的理解。本文利用一个简单的浅水大气模式研究了热带地区大气对非线性“风致地表热交换”（WISHE）强迫的响应。该模型产生了一个有趣的丰富的年际行为，包括一个缓慢的，向东传播的赤道西风多尺度信号，不符合任何自由线性波，并与MJO的特征。结果表明，该慢信号是由于柳井波群引起的纬向风所产生的WISHE强迫的开尔文波。强迫开尔文波的速度与柳井波的群速度相似，这使得两者在缓慢向东传播的同时通过WISHE项进行非线性相互作用。这些结果可能对观测到的热带WISHE相关的大气季节内现象有影响。
英文摘要：
The intraseasonal Madden-Julian oscillation (MJO) involves a slow eastward-propagating signal in the tropical atmosphere which significantly influences climate yet is not well understood despite significant theoretical and observational progress. We study the atmosphere's response to nonlinear "Wind Induced Surface Heat Exchange" (WISHE) forcing in the tropics using a simple shallow water atmospheric model. The model produces an interestingly rich interannual behavior including a slow, eastward propagating equatorial westerly multiscale signal, not consistent with any free linear waves, and with MJO-like characteristics. It is shown that the slow signal is due to a Kelvin wave forced by WISHE due to the meridional wind induced by a Yanai wave group. The forced Kelvin wave has a velocity similar to the group velocity of the Yanai waves, allowing the two to interact nonlinearly via the WISHE term while slowly propagating eastward. These results may have implications for observed tropical WISHE-related atmospheric intraseasonal phenomena.
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