| DOI: | 10.1175/JCLI-D-17-0583.1
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| Scopus记录号: | 2-s2.0-85059624074
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| 论文题名: | Weak El Niño and winter climate in the mid- to high latitudes of eurasia |
| 作者: | Zhang P.; Wang B.; Wu Z.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2019
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| 卷: | 32, 期:2 | | 起始页码: | 405
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| 结束页码: | 421
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| 语种: | 英语
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| 英文关键词: | Atmosphere
; Atmosphere-ocean interaction
; Atmospheric circulation
; Climate variability
; Interannual variability
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| Scopus关键词: | Atmospheric pressure
; Atmospheric thermodynamics
; Climatology
; Earth atmosphere
; Mechanical waves
; Oceanography
; Surface waters
; Tropics
; Waveguides
; Atmosphere-ocean interactions
; Atmospheric anomaly
; Atmospheric circulation
; Climate variability
; Interannual variability
; North Atlantic oscillations
; Numerical evidence
; Sea surface temperature anomalies
; Nickel compounds
; air-sea interaction
; annual variation
; atmospheric circulation
; climate variation
; El Nino
; sea surface temperature
; teleconnection
; temperature anomaly
; winter
; Eurasia
; Indian Ocean
; Indian Ocean (Tropical)
; Pacific Ocean
; Pacific Ocean (East)
; Pacific Ocean (West)
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| 英文摘要: | According to the sea surface temperature anomaly (SSTA) intensity in the Niño-3.4 region and the east- west gradient across the Pacific, three types of El Niño are identified in this work. An event with larger than average intensity is defined as a strong El Niño, all others are considered to be weak events. Almost all strong El Niños are concurrent with a large gradient, which is featured by negative SSTAs in the western Pacific and positive SSTAs in the equatorial eastern Pacific (EP) and Indian Ocean (IO). According to the east-west gradient, the weak events can be subdivided into gradient-weak (GW) El Niño and equatorial-weak (EW) El Niño. The GW El Niño characterizes a great east-west gradient without a significant IO SSTA. In contrast, theEWevent features a positive SSTA over the tropical IO and EP. The impact ofGWEl Niño on the North Atlantic-Eurasia continent (NA-Eurasia) displays a negative North Atlantic Oscillation (NAO)-like atmospheric anomaly, resulting in a drier and cooler-than-normal winter over Eurasia. Observational and numerical evidence indicate that the prolonged subtropical jet from the North Pacific to NA acts as a waveguide that captures the planetary Rossby waves generated by the GW El Niño. This waveguide favors the propagation of the perturbations into the downstream regions, which would affect the NA-Eurasian climate. However, theEWEl Niño is accompanied by a relatively weak subtropical jet that cannot impact the NA-Eurasian climate significantly. For the strong El Niño, the absence of theNAOsignal can be attributed to the counteracting of the teleconnections triggered by the Pacific and the tropical IO. © 2018 American Meteorological Society. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/117252
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| Appears in Collections: | 气候变化与战略
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| Recommended Citation: | |
Zhang P.,Wang B.,Wu Z.. Weak El Niño and winter climate in the mid- to high latitudes of eurasia[J]. Journal of Climate,2019-01-01,32(2)
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