DOI: 10.1175/JCLI-D-15-0287.1
Scopus记录号: 2-s2.0-84950147070
论文题名: A novel approach to diagnosing Southern Hemisphere planetary wave activity and its influence on regional climate variability
作者: Irving D. ; Simmonds I.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 23 起始页码: 9041
结束页码: 9057
语种: 英语
Scopus关键词: Fourier analysis
; Mechanical waves
; Sea ice
; Antarctica
; Atmospheric circulation
; Climate variability
; Planetary Waves
; Southern Hemisphere
; Climatology
; atmospheric circulation
; climate variation
; planetary wave
; regional climate
; Rossby wave
; Southern Hemisphere
; troposphere
; Amundsen Sea
; Bellingshausen Sea
; Southern Ocean
英文摘要: Southern Hemisphere mid- to upper-tropospheric planetary wave activity is characterized by the superposition of two zonally oriented, quasi-stationary waveforms: zonal wavenumber 1 (ZW1) and zonal wavenumber 3 (ZW3). Previous studies have tended to consider these waveforms in isolation and with the exception of those studies relating to sea ice, little is known about their impact on regional climate variability. A novel approach is taken to quantifying the combined influence of ZW1 and ZW3, using the strength of the hemispheric meridional flow as a proxy for zonal wave activity. The methodology adapts the wave envelope construct routinely used in the identification of synoptic-scale Rossby wave packets and improves on existing approaches by allowing for variations in both wave phase and amplitude. While ZW1 and ZW3 are both prominent features of the climatological circulation, the defining feature of highly meridional hemispheric states is an enhancement of the ZW3 component. Composites of the mean surface conditions during these highly meridional, ZW3-like anomalous states (i.e., months of strong planetary wave activity) reveal large sea ice anomalies over the Amundsen and Bellingshausen Seas during autumn and along much of the East Antarctic coastline throughout the year. Large precipitation anomalies in regions of significant topography (e.g., New Zealand, Patagonia, and coastal Antarctica) and anomalously warm temperatures over much of the Antarctic continent were also associated with strong planetary wave activity. The latter has potentially important implications for the interpretation of recent warming over West Antarctica and the Antarctic Peninsula. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50664
Appears in Collections: 气候变化事实与影响
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作者单位: School of Earth Sciences, University of Melbourne, Parkville, VIC, Australia
Recommended Citation:
Irving D.,Simmonds I.. A novel approach to diagnosing Southern Hemisphere planetary wave activity and its influence on regional climate variability[J]. Journal of Climate,2015-01-01,28(23)