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DOI | 10.1007/s00382-017-3871-y |
Relative contributions of external SST forcing and internal atmospheric variability to July-August heat waves over the Yangtze River valley | |
Chen, Xiaolong1; Zhou, Tianjun1,2 | |
2018-12-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2018 |
卷号 | 51页码:4403-4419 |
文章类型 | Article;Proceedings Paper |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | The Yangtze River valley (YRV), located in central-eastern China, has witnessed increased numbers of heat waves in the summer since 1951. Knowing what factors control and affect the interannual variability of heat waves, especially distinguishing the contributions of anomalous sea surface temperature (SST) forcings and those of internal modes of variability, is important to improving heat wave prediction. After evaluating 70 members of the atmospheric model intercomparison project (AMIP) experiments from the 25 models that participated in the coupled model intercomparison project phase 5 (CMIP5), 13 high-skill members (HSMs) are selected to estimate the SST-forced variability. The results show that approximately 2/3 of the total variability of the July-August heat waves in the YRV during 1979-2008 can be attributed to anomalous SST forcings, whereas the other 1/3 are due to internal variability. Within the SST-forced component, one-half of the influence is from the impact of the El Nino-Southern Oscillation (ENSO) and the other half is from non-ENSO related SST forcings, specifically, the SST anomalies in the North Pacific and the North Atlantic. Both the decaying El Nino and developing La Nina accompanied by a warm Indian Ocean and cold central Pacific, respectively, are favorable to hotter summers in the YRV because these patterns strengthen and extend the western North Pacific Subtropical High (WNPSH) westwards, for which the decaying ENSO plays a dominant role. The internal variability shows a circumglobal teleconnection in which Rossby waves propagate southeastwards over the Eurasian Continent and strengthen the WNPSH. Atmospheric model sensitivity experiments confirm that non-ENSO SST forcings can modulate the WNPSH and heat wave variability by projecting their influences onto the internal mode. |
英文关键词 | Heat wave Yangtze River valley ENSO Internal variability AMIP |
领域 | 气候变化 |
收录类别 | SCI-E ; ISTP |
WOS记录号 | WOS:000451725600029 |
WOS关键词 | HIGH-TEMPERATURE EXTREMES ; NORTH-ATLANTIC SST ; INDIAN-OCEAN ; CIRCUMGLOBAL TELECONNECTION ; INTERANNUAL VARIABILITY ; EASTERN CHINA ; SUMMER 2013 ; ANOMALIES ; IMPACTS ; TRENDS |
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/36400 |
专题 | 气候变化 |
作者单位 | 1.Chinese Acad Sci, Inst Atmospher Phys, LASG, Beijing 100029, Peoples R China; 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
推荐引用方式 GB/T 7714 | Chen, Xiaolong,Zhou, Tianjun. Relative contributions of external SST forcing and internal atmospheric variability to July-August heat waves over the Yangtze River valley[J]. CLIMATE DYNAMICS,2018,51:4403-4419. |
APA | Chen, Xiaolong,&Zhou, Tianjun.(2018).Relative contributions of external SST forcing and internal atmospheric variability to July-August heat waves over the Yangtze River valley.CLIMATE DYNAMICS,51,4403-4419. |
MLA | Chen, Xiaolong,et al."Relative contributions of external SST forcing and internal atmospheric variability to July-August heat waves over the Yangtze River valley".CLIMATE DYNAMICS 51(2018):4403-4419. |
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