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Tropical forcing of the circumglobal teleconnection pattern in boreal winter

机译：北冬季的热带强制迫使围绕

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摘要

Recently there has been an increase in interest in hemispheric-scale teleconnections. The circumglobal teleconnection pattern (CGT) is a special zonal phase of the jet whereby disturbances originating near the South Asian jet entrance, or within the jet, remain trapped and can propagate around the globe. Recent studies have shown that this CGT pattern affects climatic conditions across the entire hemisphere, from North America to Europe to South Asia. The CGT is generally thought of as an internal mode of atmospheric variability, but this study aims to examine whether the CGT can be forced during the boreal winter when the jet is at its peak amplitude. To accomplish this, we make use of a simple general circulation model to test whether an imposed diabatic heating anomaly in the tropics can force the CGT. Results from the simple model show that heating over the equatorial Indian Ocean and cooling over the western Tropical Pacific Ocean can drive a CGT-like pattern. Lagged regression using pentad reanalysis data supports these results, showing that a dipole convection pattern in these same regions precede the CGT.
机译：最近，对半球形级别的电信连接有兴趣增加。跳线遥控图案（CGT）是射流的特殊区域相位，由此源自南亚喷射入口或喷射内的扰动仍然被捕获并且可以在全球范围内传播。最近的研究表明，该CGT模式影响整个半球的气候条件，从北美到欧洲到南亚。 CGT通常被认为是大气变异性的内部模式，但是当射流处于其峰值幅度时，该研究旨在检查北方冬季中是否可以强制CGT。为实现这一目标，我们利用简单的一般循环模型来测试热带地区的施加型糖尿病加热异常是否可以强制CGT。简单模型的结果表明，在赤道印度洋上加热和在西部热带太平洋的冷却可以驾驶类似CGT的模式。使用PENTAD Reanalysis数据的滞后回归支持这些结果，显示这些相同区域中的偶极对流模式在CGT之前。

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