GSTDTAP  > 气候变化
DOI10.1007/s00382-017-4035-9
What drove the Pacific and North America climate anomalies in winter 2014/15?
Peng, Peitao; Kumar, Arun; Hu, Zeng-Zhen
2018-10-01
发表期刊CLIMATE DYNAMICS
ISSN0930-7575
EISSN1432-0894
出版年2018
卷号51页码:2667-2679
文章类型Article
语种英语
国家USA
英文摘要

In late 2014 and early 2015, the canonical atmospheric response to the El Nino and Southern Oscillation (ENSO) event was not observed in the central and eastern equatorial Pacific, although Nino3.4 index exceeded the threshold for a weak El Nino. 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 200hPa 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 Nino3.4 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 Nino3.4 region is associated with the ENSO mode or NPM, or both.


英文关键词El Nino North Pacific mode (NPM) Climate anomalies in winter 2014 15
领域气候变化
收录类别SCI-E
WOS记录号WOS:000444947600016
WOS关键词SEASONAL FOOTPRINTING MECHANISM ; SEA-SURFACE TEMPERATURE ; LEVEL PRESSURE ANOMALIES ; EL-NINO ; MERIDIONAL MODE ; COUPLED MODEL ; ATMOSPHERIC CIRCULATION ; DECADAL OSCILLATION ; WARMING HIATUS ; ENSO EVENTS
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/35687
专题气候变化
作者单位NOAA, Climate Predict Ctr, NCEP, 5830 Univ Res Court, College Pk, MD 20740 USA
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GB/T 7714
Peng, Peitao,Kumar, Arun,Hu, Zeng-Zhen. What drove the Pacific and North America climate anomalies in winter 2014/15?[J]. CLIMATE DYNAMICS,2018,51:2667-2679.
APA Peng, Peitao,Kumar, Arun,&Hu, Zeng-Zhen.(2018).What drove the Pacific and North America climate anomalies in winter 2014/15?.CLIMATE DYNAMICS,51,2667-2679.
MLA Peng, Peitao,et al."What drove the Pacific and North America climate anomalies in winter 2014/15?".CLIMATE DYNAMICS 51(2018):2667-2679.
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