DOI: 10.1175/JCLI-D-16-0094.1
Scopus记录号: 2-s2.0-85028517462
论文题名: The recent increase in the occurrence of a boreal summer teleconnection and its relationship with temperature extremes
作者: Lee M.-H. ; Lee S. ; Song H.-J. ; Ho C.-H.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 18 起始页码: 7493
结束页码: 7504
语种: 英语
Scopus关键词: Atmospherics
; Climate change
; Conformal mapping
; Mechanical waves
; Self organizing maps
; Wave propagation
; Waves
; Canadian Arctic Archipelago
; Climate variability
; European centre for medium-range weather forecasts
; Extreme events
; Extreme weather events
; Rossby wave
; Teleconnection patterns
; Teleconnections
; Weather forecasting
英文摘要: This study has investigated the relationship between temperature extremes and a subseasonal hemispheric teleconnection pattern over the Northern Hemisphere during boreal summer. By applying self-organizing map (SOM) analysis to 200-hPa geopotential fields from the European Centre for Medium-Range Weather Forecasts interim reanalysis (ERA-Interim) for the period 1979-2012, a teleconnection pattern is identified that increased dramatically in its occurrence after the late 1990s. This pattern is characterized by a zonal wavenumber-5 pattern with anomalous high pressure cores over eastern Europe, northeastern Asia, the eastern North Pacific, the eastern United States, and Greenland. These high pressure centers coincide with regions of increasingly frequent temperature extremes in recent decades. To investigate the temporal evolution of the identifiedSOMpattern, time-lagged composites were performed relative to the days in which the 200-hPa geopotential field most closely resembled the SOM pattern. From day 210 to day 0, a wave train propagated from the central tropical Pacific to the Canadian Arctic Archipelago and Greenland. This poleward wave propagation was followed by the establishment of quasi-stationary high pressure centers over Greenland, Europe, and Asia. This study suggests that more frequent occurrence of the hemispheric teleconnection is linked to more severe and longer extreme weather events over the Northern Hemisphere since the late 1990s. © 2017 American Meteorological Society. 资助项目: Seoul National University
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48724
Appears in Collections: 气候减缓与适应 气候变化与战略
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作者单位: Korea Polar Research Institute, Incheon, South Korea; School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea; Department of Meteorology, The Pennsylvania State University, University Park, PA, United States; Korea Institute of Atmospheric Prediction Systems, Seoul, South Korea
Recommended Citation:
Lee M.-H.,Lee S.,Song H.-J.,et al. The recent increase in the occurrence of a boreal summer teleconnection and its relationship with temperature extremes[J]. Journal of Climate,2017-01-01,30(18)