准共振行星波动力学在近期北半球春季至秋季极端事件中的作用。
Role of quasiresonant planetary wave dynamics in recent boreal spring-to-autumn extreme events.
作者信息
Petoukhov Vladimir, Petri Stefan, Rahmstorf Stefan, Coumou Dim, Kornhuber Kai, Schellnhuber Hans Joachim
机构信息
Potsdam Institute for Climate Impact Research, D-14412 Potsdam, Germany;
Potsdam Institute for Climate Impact Research, D-14412 Potsdam, Germany; Santa Fe Institute, Santa Fe, NM 87501
出版信息
Proc Natl Acad Sci U S A. 2016 Jun 21;113(25):6862-7. doi: 10.1073/pnas.1606300113. Epub 2016 Jun 6.
Abstract
In boreal spring-to-autumn (May-to-September) 2012 and 2013, the Northern Hemisphere (NH) has experienced a large number of severe midlatitude regional weather extremes. Here we show that a considerable part of these extremes were accompanied by highly magnified quasistationary midlatitude planetary waves with zonal wave numbers m = 6, 7, and 8. We further show that resonance conditions for these planetary waves were, in many cases, present before the onset of high-amplitude wave events, with a lead time up to 2 wk, suggesting that quasiresonant amplification (QRA) of these waves had occurred. Our results support earlier findings of an important role of the QRA mechanism in amplifying planetary waves, favoring recent NH weather extremes.
摘要
在2012年和2013年的北半球寒带地区春季至秋季（5月至9月），北半球经历了大量严重的中纬度地区极端天气。我们在此表明，这些极端天气中有相当一部分伴随着纬向波数m = 6、7和8的高度放大的准静止中纬度行星波。我们进一步表明，在许多情况下，这些行星波的共振条件在高振幅波事件开始前就已出现，提前时间长达2周，这表明这些波发生了准共振放大（QRA）。我们的结果支持了QRA机制在放大行星波中起重要作用的早期发现，这有利于近期北半球的极端天气。
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