The weakening summer circulation in the Northern Hemisphere mid-latitudes

被引：294

作者：

Coumou, Dim ^{[1
]}

Lehmann, Jascha ^{[1
,2
]}

Beckmann, Johanna ^{[1
,2
]}

机构：

[1] Potsdam Inst Climate Impact Res, Earth Syst Anal, D-14412 Potsdam, Germany

[2] Univ Potsdam, Potsdam, Germany

来源：

SCIENCE | 2015年 / 348卷 / 6232期

关键词：

ARCTIC AMPLIFICATION; PLANETARY-WAVES; WEATHER; VARIABILITY; WARM;

D O I：

10.1126/science.1261768

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Rapid warming in the Arctic could influence mid-latitude circulation by reducing the poleward temperature gradient. The largest changes are generally expected in autumn or winter, but whether significant changes have occurred is debated. Here we report significant weakening of summer circulation detected in three key dynamical quantities: (i) the zonal-mean zonal wind, (ii) the eddy kinetic energy (EKE), and (iii) the amplitude of fast-moving Rossby waves. Weakening of the zonal wind is explained by a reduction in the poleward temperature gradient. Changes in Rossby waves and EKE are consistent with regression analyses of climate model projections and changes over the seasonal cycle. Monthly heat extremes are associated with low EKE, and thus the observed weakening might have contributed to more persistent heat waves in recent summers.

引用

页码：324 / 327

页数：4

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