DOI: 10.1007/s00382-017-4035-9
Scopus记录号: 2-s2.0-85037681286
论文题名: What drove the Pacific and North America climate anomalies in winter 2014/15?
作者: Peng P. ; Kumar A. ; Hu Z.-Z.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 51, 期: 2018-07-08 起始页码: 2667
结束页码: 2679
语种: 英语
英文关键词: Climate anomalies in winter 2014/15
; El Niño
; North Pacific mode (NPM)
Scopus关键词: El Nino
; El Nino-Southern Oscillation
; precipitation (climatology)
; sea surface temperature
; temperature anomaly
; winter
; North America
; Pacific Ocean
; Pacific Ocean (Equatorial)
; Pacific Ocean (North)
; Pacific Ocean (Subtropical)
英文摘要: In late 2014 and early 2015, the canonical atmospheric response to the El Niño and Southern Oscillation (ENSO) event was not observed in the central and eastern equatorial Pacific, although Niño3.4 index exceeded the threshold for a weak El Niño. In an effort to understand why it was so, this study deconvoluted the observed 2014/15 December–January–February (DJF) mean sea surface temperature (SST), precipitation and 200 hPa stream function anomalies into the leading patterns related to the principal components of DJF SST variability. It is noted that the anomalies of these variables were primarily determined by the patterns related to two SST modes: one is the North Pacific mode (NPM), and the other the ENSO mode. The NPM was responsible for the apparent lack of coupled air–sea relationship in the central equatorial Pacific and the east–west structure of the circulation anomalies over North America, while the ENSO mode linked to SSTs in the central and eastern equatorial Pacific as well as the circulation in the central equatorial Pacific. Further, the ENSO signal in DJF 2014/15 likely evolved from the NPM pattern in winter 2013/14. Its full development, however, was impeded by the easterly anomalies in the central equatorial Pacific that was associated with negative SST anomalies in the southeastern subtropical Pacific. In addition, the analyses also indicates that the SST anomalies in the Niño3.4 region alone were not adequate for capturing the coupling of oceanic and atmospheric anomalies in the tropical Pacific, due to the fact that this index cannot distinguish whether the SST anomaly in the Niño3.4 region is associated with the ENSO mode or NPM, or both. © 2017, Springer-Verlag GmbH Germany, part of Springer Nature. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109083
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: Climate Prediction Center, NCEP/NOAA, 5830 University Research Court, College Park, MD 20740, United States
Recommended Citation:
Peng P.,Kumar A.,Hu Z.-Z.. What drove the Pacific and North America climate anomalies in winter 2014/15?[J]. Climate Dynamics,2018-01-01,51(2018-07-08)