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DOI | 10.1007/s00382-017-3995-0 |
Distinct winter patterns of tropical Pacific convection anomaly and the associated extratropical wave trains in the Northern Hemisphere | |
Ding, Shuoyi1,2; Chen, Wen1,2; Graf, Hans-F.1; Guo, Yuanyuan3; Nath, Debashis1 | |
2018-09-01 | |
发表期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2018 |
卷号 | 51页码:2003-2022 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | In this paper, distinct patterns of boreal winter convection anomalies over the tropical Pacific and associated wave trains in the extratropics are addressed. The first leading mode (EOF1) of convection anomalies as measured by outgoing longwave radiation demonstrates an east-west oscillation of deep convection with centers over the equatorial central Pacific (CP) and over the tropical western North Pacific and the Maritime Continent. The second leading mode (EOF2) is also a dipole pattern with opposite centers straddling 170A degrees W, possibly modifying EOF1 to some extent. Combining the first two leading modes, five major categories of tropical convection anomalies can be identified for the period 1979/80-2012/13. The comparison between these five categories and the corresponding SST anomaly patterns indicates a nonlinear relationship between convection and SST. The combination of EOF1 and EOF2 with in-phase PCs exhibits an east-west dipole pattern with opposite signs over west of the dateline and the Maritime Continent. The negative phase of the two PCs, named La Nia pattern, induces a negative Pacific/North American-positive North Atlantic Oscillation teleconnection in the extratropics. Approximately opposite responses can be detected in its positive phase, named CP El Nio pattern. The negative PC2 superposing positive PC1, named EP El Nio pattern, shows the strongest convection anomalies with enhanced (depressed) convection over the eastern (western) Pacific and leads to a Tropical/Northern Hemisphere-like teleconnection pattern and an anomalous anticyclone extending from the North Pacific to the North Atlantic. The positive PC2 with neutral PC1, named western CP pattern, shows weakly enhanced convection to the west of the dateline as a response to local SST warming around the dateline. This convection anomaly pattern, although weak, is important and excites a northeastward wave train from the tropics to Greenland, resulting in surface air temperature cooling covering the northeastern North America and warmer and wetter conditions over Western Europe. |
英文关键词 | Tropical Pacific convection Extratropical wave train Western CP pattern Indonesia West Pacific dipole CP and EP El Nino |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000442433200023 |
WOS关键词 | OUTGOING LONGWAVE RADIATION ; NINO-SOUTHERN OSCILLATION ; TERM CLIMATE VARIABILITY ; EL-NINO ; ATMOSPHERIC CIRCULATION ; INTERANNUAL SEESAW ; AMERICAN CLIMATE ; WESTERN PACIFIC ; ICELANDIC LOWS ; ENSO INFLUENCE |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/36081 |
专题 | 气候变化 |
作者单位 | 1.Chinese Acad Sci, Inst Atmospher Phys, Ctr Monsoon Syst Res, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Earth Sci, Beijing, Peoples R China; 3.Sun Yat Sen Univ, Sch Atmospher Sci, Ctr Monsoon & Environm Res, Guangzhou, Guangdong, Peoples R China |
推荐引用方式 GB/T 7714 | Ding, Shuoyi,Chen, Wen,Graf, Hans-F.,et al. Distinct winter patterns of tropical Pacific convection anomaly and the associated extratropical wave trains in the Northern Hemisphere[J]. CLIMATE DYNAMICS,2018,51:2003-2022. |
APA | Ding, Shuoyi,Chen, Wen,Graf, Hans-F.,Guo, Yuanyuan,&Nath, Debashis.(2018).Distinct winter patterns of tropical Pacific convection anomaly and the associated extratropical wave trains in the Northern Hemisphere.CLIMATE DYNAMICS,51,2003-2022. |
MLA | Ding, Shuoyi,et al."Distinct winter patterns of tropical Pacific convection anomaly and the associated extratropical wave trains in the Northern Hemisphere".CLIMATE DYNAMICS 51(2018):2003-2022. |
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