DOI: 10.1002/joc.5697
论文题名: Prolonged seasonal drought events over northern China and their possible causes
作者: Li X. ; Li D. ; Li X. ; Chen L.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2018
卷: 38, 期: 13 起始页码: 4802
结束页码: 4817
语种: 英语
英文关键词: El Niño-Southern Oscillation
; northern China
; prolonged seasonal drought
; teleconnection pattern
Scopus关键词: Atmospheric pressure
; Lanthanum
; Orthogonal functions
; Circumglobal teleconnection patterns
; Empirical orthogonal function analysis
; Northern China
; Physical connections
; Seasonal droughts
; Southern oscillation
; Teleconnection patterns
; Vertical circulation
; Drought
; climate change
; drought
; El Nino-Southern Oscillation
; evapotranspiration
; meridional circulation
; precipitation assessment
; seasonality
; teleconnection
; Walker circulation
; China
; Eurasia
; Scandinavia
英文摘要: The features and possible causes of prolonged seasonal drought (PSD) events over northern China (NC) during 1960–2012 are explored in this study using the multi-scale standardized precipitation evapotranspiration index (SPEI). The results show that PSD events (i.e., drought events with a timescale of 9 months or less) have had a relatively high probability of occurrence from spring to autumn during the past five decades. The results of the empirical orthogonal function (EOF) analysis show that the leading mode of the SPEI09 in autumn reflects a broad pattern of drought in NC, which confirms the existence of the PSD events. Furthermore, we conclude that two factors, teleconnection patterns in the mid-latitudes of Eurasia and transitions from La Niña to El Niño, are mainly responsible for the PSD events. On the one hand, the associated teleconnection patterns in the upper-level troposphere show an Eurasian (EU)-like pattern in spring, the Silk Road (SR) pattern or the circumglobal teleconnection (CGT) pattern in summer, and a Scandinavia (SCA)-like pattern in autumn, respectively. Associated with these teleconnection patterns, descending anomalies are detected in the whole atmosphere over NC in all seasons. On the other hand, the transition from La Niña (winter) to El Niño (the following autumn) also exerts effects on the PSD through modulating the Walker circulation and the meridional vertical circulation along the coast of East Asia. However, this process is more effective in spring relative to summer and autumn. In addition, physical connections likely exist among these factors, and their combined effects, together with the insufficient moisture supply, regulate the PSD events over NC. © 2018 Royal Meteorological Society Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/116746
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster, Ministry of Education, Nanjing University of Information Science & Technology (NUIST), Nanjing, China; International Joint Research Laboratory on Climate and Environment Change (ILCEC), Nanjing University of Information Science & Technology (NUIST), Nanjing, China; Institute of Atmospheric Sciences, Fudan University, Shanghai, China
Recommended Citation:
Li X.,Li D.,Li X.,et al. Prolonged seasonal drought events over northern China and their possible causes[J]. International Journal of Climatology,2018-01-01,38(13)