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DOI | 10.1007/s00382-019-04705-4 |
Subseasonal zonal variability of the western Pacific subtropical high in summer: climate impacts and underlying mechanisms | |
Guan, WeiNa1; Hu, HaiBo1,2; Ren, XueJuan1; Yang, Xiu-Qun1 | |
2019-09-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2019 |
卷号 | 53页码:3325-3344 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | The zonal oscillation of the western Pacific subtropical high (WPSH) significantly influences the weather and climate over East Asia. This study investigates characteristics and mechanisms of the zonal variability of the WPSH on subseasonal time scales during summer by using a subseasonal WPSH (Sub-WPSH) index. Accompanied with the Sub-WPSH index, strong anticyclonic (cyclonic) anomalies are found over East Asia and coastal region south of 30 degrees N on both 850 hPa and 500 hPa. During the positive period of the Sub-WPSH index, the WPSH extends more westward with enhanced precipitation over the Yangtze-Huaihe river basin and suppressed precipitation over the south of the Yangtze River in China. These precipitation anomalies can last for at least 1 week. While the subseasonal zonal variability of the WPSH is found to be closely associated with atmospheric teleconnections and local air- sea interaction, the mechanisms of the variability are different before and after mid-July (early and late summer). In both early and late summer, the East Asia/Pacific (EAP) wave train pattern affects the zonal shift of the WPSH by inducing a low-level anomalous anticyclonic/cyclonic circulation over the subtropical western Pacific, and this mechanism is stronger in late summer. In constrast, the influence of the Silk-Road pattern wave train is more important in the early summer. Meanwhile, in late summer, a stronger SST forcing on the atmosphere and a faster cycle of subseasonal variations of the WPSH are observed before the westward stretch of the WPSH, which could be related to the colder local SST anomalies. The westward stretch of the WPSH is accompanied by stronger anticyclonic anomalies in late summer. |
英文关键词 | Summer Yangtze rainfall The western Pacific subtropical high Subseasonal variability Rossby wave train Local air-sea interaction |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000483626900049 |
WOS关键词 | EAST-ASIAN MONSOON ; NORTH PACIFIC ; TELECONNECTION PATTERNS ; INTERANNUAL VARIABILITY ; EXTENDED WESTWARD ; PART I ; PRECIPITATION ; RAINFALL ; FEATURES ; JAPAN |
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/186377 |
专题 | 气候变化 |
作者单位 | 1.Nanjing Univ, Sch Atmospher Sci, Inst Climate & Global Change Res, CMA NJU Joint Lab Climate Predict Studies, Nanjing 210093, Jiangsu, Peoples R China; 2.Nanjing Univ Informat Sci & Technol, Minist Educ, Key Lab Meteorol Disaster, Nanjing 210044, Jiangsu, Peoples R China |
推荐引用方式 GB/T 7714 | Guan, WeiNa,Hu, HaiBo,Ren, XueJuan,et al. Subseasonal zonal variability of the western Pacific subtropical high in summer: climate impacts and underlying mechanisms[J]. CLIMATE DYNAMICS,2019,53:3325-3344. |
APA | Guan, WeiNa,Hu, HaiBo,Ren, XueJuan,&Yang, Xiu-Qun.(2019).Subseasonal zonal variability of the western Pacific subtropical high in summer: climate impacts and underlying mechanisms.CLIMATE DYNAMICS,53,3325-3344. |
MLA | Guan, WeiNa,et al."Subseasonal zonal variability of the western Pacific subtropical high in summer: climate impacts and underlying mechanisms".CLIMATE DYNAMICS 53(2019):3325-3344. |
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