DOI: 10.1175/JCLI-D-18-0130.1
Scopus记录号: 2-s2.0-85053027365
论文题名: Afro-Eurasian intermediate-frequency teleconnection and modulation by ENSO
作者: He S. ; Yang S. ; Lu M. ; Li Z.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 19 起始页码: 8121
结束页码: 8139
语种: 英语
英文关键词: ENSO
; Teleconnections
Scopus关键词: Atmospheric pressure
; Frequency modulation
; Mechanical waves
; Waveguides
; Atmospheric variability
; Atmospheric variations
; East asian jet streams
; ENSO
; Intermediate frequencies
; Meteorological fields
; Meteorological signals
; Teleconnections
; Climatology
英文摘要: The Afro-Eurasian intermediate-frequency atmospheric teleconnection conveys meteorological signals zonally, leads to various atmospheric variations, and causes extreme events along its path. This study, aimed at demonstrating the characteristics of the teleconnection, reveals that the teleconnection accounts for nearly half of the atmospheric variability and significantly influences different meteorological fields. With the propagation of signals associated with the teleconnection, local weather varies from prolonged dry and warm days to extended wet and cold days. El Niño-Southern Oscillation (ENSO) modulates the interannual variation of the teleconnection: it becomes more active and its downstream pattern shifts southward during El Niño events. Two responsible mechanisms are proposed for the ENSO modulation: the eddy-to-eddy interaction that leads to the change in the activeness of the teleconnection and the waveguide effect that accounts for the shift of the teleconnection. First, the El Niño-related Atlantic anomalies of the Rossby wave train and storm track amplify the Atlantic disturbances of the intermediate frequency and thus the activeness of the teleconnection. Second, during El Niño years, the East Asian jet stream shifts southward, resulting in the southward shifts of the downstream waveguide effect and thus the downstream pattern. This study also demonstrates that when investigating an atmospheric mode or its impacts, the signals of different time scales should be separated and the cross-frequency interactive systems necessitate examinations. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110650
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, School of Atmospheric Sciences, Sun Yat-sen University, Guangzhou, Guangdong, China; Institute of Earth Climate and Environment System, Sun Yat-sen University, Guangzhou, Guangdong, China
Recommended Citation:
He S.,Yang S.,Lu M.,et al. Afro-Eurasian intermediate-frequency teleconnection and modulation by ENSO[J]. Journal of Climate,2018-01-01,31(19)