| DOI: | 10.1175/JCLI-D-16-0376.1
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| Scopus记录号: | 2-s2.0-85017508572
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| 论文题名: | Combined impacts of PDO and two types of La Niña on climate anomalies in Europe |
| 作者: | Ding S.; Chen W.; Feng J.; Grafa H.-F.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2017
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| 卷: | 30, 期:9 | | 起始页码: | 3253
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| 结束页码: | 3278
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| 语种: | 英语
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| Scopus关键词: | Atmospheric pressure
; Atmospheric thermodynamics
; Climate change
; Climatology
; Flow interactions
; Nickel
; Oceanography
; Troposphere
; Atmosphere-ocean interactions
; ENSO
; North American
; North Atlantic oscillations
; Pacific decadal oscillation
; Stratosphere-troposphere coupling
; Lanthanum
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| 英文摘要: | Combined impacts of the Pacific decadal oscillation (PDO) and two types of La Niña on climate anomalies in Europe are studied. Particularly, the conjunction of the negative PDO phase and two different types of La Niña events favors strong and significant North Atlantic Oscillation (NAO) pattern anomalies with opposite polarity. For the central Pacific (CP) La Niña, a clear positive NAO signal can be detected, which is accompanied by positive surface air temperature (SAT) anomaly and a dipolar structure of precipitation anomalies in Europe. In addition, a typical negative Pacific-North America (PNA) teleconnection pattern forms, including a high pressure anomaly over the southeastern United States, which may contribute to the development and maintenance of the NAO anomaly by strengthening the baroclinicity and the local eddy-mean flow interaction. However, for the eastern Pacific (EP) La Niña, a zonal wave train in the high latitudes can be observed, which is quite different from the typical PNA structure. Here, an anomalous anticyclone over southern Greenland supports a negative NAO pattern through the local eddy-mean flow interaction and the associated vorticity advection. Hence, reversed SAT and precipitation anomalies occur over Europe. Further analyses indicate that the wave trains emanating from the North Pacific and the synoptic eddy-mean flow interaction play essential roles in forming the anomalous NAO phases. The different wave trains for the CP and EP La Niña events may be attributed to the differences in the location and intensity of anomalous convection induced by different types of SST anomaly as well as by the corresponding background westerly wind anomalies in the upper troposphere. © 2017 American Meteorological Society. |
| 资助项目: | NSFC, National Natural Science Foundation of China
; NSFC, National Natural Science Foundation of China
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| Citation statistics: |
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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/49693
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
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| Recommended Citation: | |
Ding S.,Chen W.,Feng J.,et al. Combined impacts of PDO and two types of La Niña on climate anomalies in Europe[J]. Journal of Climate,2017-01-01,30(9)
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