DOI: 10.1175/JCLI-D-17-0232.1
Scopus记录号: 2-s2.0-85040620757
论文题名: Large-scale circulation anomalies and intraseasonal oscillations associated with long-lived extreme heat events in South China
作者: Chen R. ; Wen Z. ; Lu R.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 1 起始页码: 213
结束页码: 232
语种: 英语
英文关键词: Large-scale motions
; Synoptic climatology
Scopus关键词: Climatology
; Nickel
; Storms
; Anticyclonic anomalies
; Circulation anomalies
; Interannual forecasting
; Intraseasonal oscillations
; Large scale motion
; Large-scale circulation
; Synoptic climatology
; Tropical Western Pacific
; Tropical engineering
; air-sea interaction
; anticyclone
; atmospheric circulation
; convection
; El Nino
; extreme event
; La Nina
; seasonal variation
; synoptic meteorology
; warming
; China
; Pacific Ocean
; Pacific Ocean (West)
英文摘要: South China experiences extreme heat (EH) most frequently in eastern China. This study specifically explores the large-scale circulation anomalies associated with long-lived EH events in south China. The results show that there is an anomalous cyclone (anticyclone) and active (inactive) convection over south China (the western Pacific) before the EH onset; then, an anticyclone develops and moves northwestward and dominates over south China on the onset day. The anomalous anticyclone maintains its strength over south China and then diminishes and is replaced by another cyclone migrating from the western Pacific after the final day of the EH event. Consequently, the temperature increases over south China around the onset day and is anomalously warm for approximately 10 days on average and then decreases shortly thereafter. The fluctuating anomalies over south China and the western Pacific are intimately related to two intraseasonal oscillation (ISO) modes, namely, the 5-25- and 30-90-day oscillations, which originate from the tropical western Pacific and propagate northwestward. The 5-25-day oscillation is vital to triggering and terminating EH, accounting for approximately half of the original temperature and circulation anomaly transitions. The 30-90-day oscillation favors the persistent warming during EH events, accounting for approximately one-third of the original prolonged warming and anticyclonic anomaly. This result suggests that different ISO modes play crucial roles at different stages of the events. Moreover, a higher annual frequency of long-lived EH days in south China is associated with the transition phase from El Niño to La Niña. It is suggested that both medium-range and interannual forecasting of long-lived EH in south China are possible. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111736
Appears in Collections: 气候减缓与适应
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作者单位: Center for Monsoon and Environment Research, School of Atmospheric Sciences, Sun Yat-sen University, Guangzhou, China; Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, School of Atmospheric Sciences, Sun Yat-sen University, Guangzhou, China; State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; Jiangsu Collaborative Innovation Center for Climate Change, Nanjing, China; Institute of Atmospheric Sciences, Fudan University, Shanghai, China; University of the Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Chen R.,Wen Z.,Lu R.. Large-scale circulation anomalies and intraseasonal oscillations associated with long-lived extreme heat events in South China[J]. Journal of Climate,2018-01-01,31(1)