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DOI | 10.1175/JCLI-D-16-0760.1 |
Summer Rainfall Seesaw between Hetao and the Middle and Lower Reaches of the Yangtze River and Its Relationship with the North Atlantic Oscillation | |
Jin, Dachao1,2; Guan, Zhaoyong1 | |
2017-09-01 | |
发表期刊 | JOURNAL OF CLIMATE
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ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2017 |
卷号 | 30期号:17 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | Using the NCEP-NCAR reanalysis and other observational datasets, the authors have investigated the relationship of summer rainfall variations between the Hetao region of northern China and the middle and lower reaches of Yangtze River (MLRYR). The results have demonstrated that rainfall in Hetao varies out of phase with that in MLRYR on the interannual time scales. This phenomenon is referred to as the Hetao-Yangtze rainfall seesaw (HYRS). An HYRS index is defined to reveal both spatial and temporal features of HYRS. It is found that the North Atlantic Oscillation (NAO) affects the HYRS. In years when the NAO is in its positive phase, anomalous divergences in the lower troposphere and anomalous convergences in the upper troposphere are observed in regions of the Mediterranean and eastern Europe. The anomalous convergences in the upper troposphere occur as the positive Rossby wave source excites a circumglobal teleconnection (CGT) in the midlatitudes, exhibiting the eastward propagation of Rossby wave energy along the Asian jet. Meanwhile, the Eurasian-Pacific (EUP) teleconnection also affects the HYRS. Influenced mainly by the CGT pattern, the circulations over Hetao and MLRYR are consequently perturbed. The atmosphere over Hetao converges anomalously in the lower troposphere and diverges anomalously in the upper troposphere, facilitating more than normal rainfall there. At the same time, the atmosphere over MLRYR diverges anomalously in the lower troposphere and converges anomalously in the upper troposphere, resulting in more than normal summer rainfall in MLRYR. In this way, the north-south rainfall seesaw is formed. This NAO-induced rainfall seesaw is potentially useful for summer rainfall predictions in both MLRYR and the Hetao region of northern China. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000407276600003 |
WOS关键词 | EAST-ASIAN SUMMER ; DAILY PRECIPITATION EXTREMES ; ARCTIC OSCILLATION ; TELECONNECTION PATTERN ; SURFACE-TEMPERATURE ; MARITIME CONTINENT ; HEMISPHERE SUMMER ; WESTERN PACIFIC ; WAVE-GUIDE ; EL-NINO |
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/20686 |
专题 | 气候变化 |
作者单位 | 1.Nanjing Univ Informat Sci & Technol, Minist Educ, Key Lab Meteorol Disaster, Collaborat Innovat Ctr Forecast & Evaluat Meteoro, Nanjing, Jiangsu, Peoples R China; 2.Chinese Acad Meteorol Sci, State Key Lab Severe Weather, Beijing, Peoples R China |
推荐引用方式 GB/T 7714 | Jin, Dachao,Guan, Zhaoyong. Summer Rainfall Seesaw between Hetao and the Middle and Lower Reaches of the Yangtze River and Its Relationship with the North Atlantic Oscillation[J]. JOURNAL OF CLIMATE,2017,30(17). |
APA | Jin, Dachao,&Guan, Zhaoyong.(2017).Summer Rainfall Seesaw between Hetao and the Middle and Lower Reaches of the Yangtze River and Its Relationship with the North Atlantic Oscillation.JOURNAL OF CLIMATE,30(17). |
MLA | Jin, Dachao,et al."Summer Rainfall Seesaw between Hetao and the Middle and Lower Reaches of the Yangtze River and Its Relationship with the North Atlantic Oscillation".JOURNAL OF CLIMATE 30.17(2017). |
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