DOI: 10.1007/s00382-017-3818-3
Scopus记录号: 2-s2.0-85025826661
论文题名: Enhancement of the relationship between the winter Arctic oscillation and the following summer circulation anomalies over central East Asia since the early 1990s
作者: Qiao S. ; Hu P. ; Feng T. ; Cheng J. ; Han Z. ; Gong Z. ; Zhi R. ; Feng G.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 50, 期: 2018-09-10 起始页码: 3485
结束页码: 3503
语种: 英语
英文关键词: Arctic oscillation
; Central East Asia
; Circumglobal teleconnection
; Indian summer monsoon
; Regime shift
; Tropical Atlantic
Scopus关键词: Arctic Oscillation
; jet stream
; monsoon
; rainfall
; sea surface temperature
; summer
; teleconnection
; winter
; Atlantic Ocean
; Atlantic Ocean (Tropical)
; Far East
英文摘要: Considering the possible lag of the impact of the winter Arctic oscillation (AO) on the subsequent summer climate anomalies over East Asia and that the relationship between them may differ during different periods, the non-stationary relationship between these systems and the corresponding mechanism of connection are investigated in this study. A regime shift of the winter AO index was detected around 1988, with mean AO indices of −0.69 and 0.10 for 1958–1987 and 1988–2014, respectively, and their differences passed the 99% confidence level. After the regime shift and especially since the early 1990s, negative (positive) winter AO indices corresponds with positive (negative) height anomalies over central East Asia (CEA) during the following summer. Meanwhile, the westerly jet stream tends to be northward (southward) and the East Asian summer monsoon (EASM) is strong (weak), which contributes to the warm (cold) anomalies over central China and the significantly enhanced (reduced) rainfall over northeast China. After the early 1990s, the enhanced connection of the winter AO and the following summer height anomalies over CEA is largely due to the enhanced connection of the winter AO and the following Indian summer monsoon (ISM) rainfall during the same period. The negative (positive) winter AO favors increasing (decreasing) rainfall over the ISM region, which triggers a positive (negative) circumglobal teleconnection (CGT), and results in significantly positive (negative) height anomalies over CEA. One way the winter AO could influence the following ISM rainfall is that the negative (positive) winter AO memories will be maintained by the positive (negative) sea surface temperature (SST) anomalies over the tropical Atlantic of the following summer, which are responsible for the La Niña (El Niño) developing phase and increases (decreases) the ISM rainfall. © 2017, Springer-Verlag GmbH Germany. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109320
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: College of Atmospheric Sciences, Lanzhou University, Lanzhou, China; National Climate Center, China Meteorological Administration, Beijing, 100081, China; College of Physical Science and Technology, Yangzhou University, Yangzhou, China
Recommended Citation:
Qiao S.,Hu P.,Feng T.,et al. Enhancement of the relationship between the winter Arctic oscillation and the following summer circulation anomalies over central East Asia since the early 1990s[J]. Climate Dynamics,2018-01-01,50(2018-09-10)