DOI: 10.1175/JCLI-D-14-00739.1
Scopus记录号: 2-s2.0-84957636119
论文题名: The continuum of wintertime Southern Hemisphere atmospheric teleconnection patterns
作者: Chang C.-H. ; Johnson N.C.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 24 起始页码: 9507
结束页码: 9529
语种: 英语
Scopus关键词: Atmospheric pressure
; Climate change
; Conformal mapping
; Sea ice
; Self organizing maps
; Time measurement
; Wind effects
; Antarctic oscillation
; ENSO
; Intraseasonal variability
; Madden-Julian oscillation
; Teleconnections
; Trends
; Variability
; Climatology
; air temperature
; Antarctic Oscillation
; atmospheric circulation
; El Nino-Southern Oscillation
; Madden-Julian oscillation
; sea ice
; seasonal variation
; Southern Hemisphere
; surface temperature
; teleconnection
; trend analysis
; winter
英文摘要: This study uses the method of self-organizing maps (SOMs) to categorize the June-August atmospheric teleconnections in the 500-hPa geopotential height field of the Southern Hemisphere (SH) extratropics. This approach yields 12 SOM patterns that provide a discretized representation of the continuum of SH teleconnection patterns from 1979 to 2012. These 12 patterns are large in spatial scale, exhibiting a mix of annular mode characteristics and wave trains of zonal wavenumber varying from 2 to 4. All patterns vary with intrinsic time scales of about 5-10 days, but some patterns exhibit quasi-oscillatory behavior over a period of 20-30 days, whereas still others exhibit statistically significant enhanced and suppressed frequencies up to about four weeks in association with the Madden-Julian oscillation. Two patterns are significantly influenced by El Niño-Southern Oscillation (ENSO) on interannual time scales. All 12 patterns have strong influences on surface air temperature and sea ice concentrations, with the sea ice response occurring over a time scale of about 2-4 weeks. The austral winter has featured a positive frequency trend in patterns that project onto the negative phase of the southern annular mode (SAM) and a negative frequency trend in positive SAM-like patterns. Such atmospheric circulation trends over 34 yr may arise through atmospheric internal variability alone, and, unlike other seasons in the SH, it is not necessary to invoke external forcing as a dominant source of circulation trends. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50718
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan; International Pacific Research Center, SOEST, University of Hawai'i at Manoa, Honolulu, HI, United States; Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States; Cooperative Institute for Climate Science, Princeton University, Princeton, NJ, United States
Recommended Citation:
Chang C.-H.,Johnson N.C.. The continuum of wintertime Southern Hemisphere atmospheric teleconnection patterns[J]. Journal of Climate,2015-01-01,28(24)