DOI: 10.1175/JCLI-D-16-0703.1
Scopus记录号: 2-s2.0-85025670908
论文题名: Summertime planetary wave resonance in the Northern and Southern hemispheres
作者: Kornhuber K. ; Petoukhov V. ; Karoly D. ; Petri S. ; Rahmstorf S. ; Coumou D.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 16 起始页码: 6133
结束页码: 6150
语种: 英语
Scopus关键词: Meteorology
; Resonance
; Troposphere
; Atmospheric circulation
; Extreme events
; Extreme weather events
; Northern hemisphere
; Planetary Waves
; Southern Hemisphere
; Surface weather conditions
; Zonal-mean zonal winds
; Fighter aircraft
英文摘要: Slow-moving planetary waves of high amplitudes are often associated with persistent surface weather conditions. This persistence can lead to extreme weather events with potentially serious implications for society and nature. Quasi-resonant amplification (QRA) of planetary waves has been proposed as a mechanism to generate high-amplitude hemisphere-wide patterns of wavenumbers 6-8 in the Northern Hemisphere (NH) summer. Here this mechanism is studied in both hemispheres. Analyzing 1979-2015 reanalysis data, evidence for QRA in the Southern Hemisphere (SH) is found for wavenumbers 4 and 5. It is shown that the difference in resonating wavenumbers between hemispheres stems from the different magnitude and latitudinal shape of the respective zonal-mean zonal winds. During resonance events a strong and narrow jet is observed in both hemispheres, whereas the emergence of a second zonal mean jet at high latitudes (i.e., a "double jet") is seen in the NH only. Strong and narrow jets can form stable, zonally oriented waveguides, which are an essential prerequisite for resonance. After investigating the waves' preferred phase positions during QRA, a bimodal behavior is identified for wavenumbers 4 and 5 in the SH and for wavenumber 6 in the NH, whereas wavenumbers 7 and 8 exhibit a single preferred phase position in the NH. Composite plots of meridional wind and temperature anomalies during periods when the resonating wave is in the preferred phase position indicate those regions that are most likely to experience heat extremes. These regions include western North America, western Europe, and central Eurasia in the NH and Patagonia and Australia in the SH. © 2017 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48778
Appears in Collections: 气候减缓与适应 气候变化与战略
There are no files associated with this item.
作者单位: Potsdam Institute for Climate Impact Research-Earth System Analysis, Potsdam, Germany; Universität Potsdam, Potsdam, Germany; ARC Centre of Excellence for Climate System Science, University of Melbourne, Parkville, VIC, Australia; Institute for Environmental Studies, Vrije Universiteit, Amsterdam, Netherlands
Recommended Citation:
Kornhuber K.,Petoukhov V.,Karoly D.,et al. Summertime planetary wave resonance in the Northern and Southern hemispheres[J]. Journal of Climate,2017-01-01,30(16)