Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-18-0370.1 |
Summer Arctic Cold Anomaly Dynamically Linked to East Asian Heat Waves | |
Wu, Bingyi1,2; Francis, Jennifer A.3 | |
2019-02-01 | |
发表期刊 | JOURNAL OF CLIMATE
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ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2019 |
卷号 | 32期号:4页码:1137-1150 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA |
英文摘要 | During recent years, the rapidly warming Arctic and its impact on winter weather and climate variability in the mid- and low latitudes have been the focus of many research efforts. In contrast, anomalous cool Arctic summers and their impacts on the large-scale circulation have received little attention. In this study, we use atmospheric reanalysis data to reveal a dominant pattern of summer 1000-500-hPa thickness variability north of 30 degrees N and its association with East Asian heat waves. It is found that the second thickness pattern exhibits strong interannual variability but does not exhibit any trend. Spatially, the positive phase of the second thickness pattern corresponds with significant Arctic cold anomalies in the mid- and low troposphere, which are surrounded by warm anomalies outside the Arctic. This pattern is the thermodynamic expression of the leading pattern of upper-tropospheric westerly variability and significantly correlated with the frequency of East Asian heat waves. The Arctic has experienced frequent summer cold anomalies since 2005, accompanied by strengthened tropospheric westerly winds over most of the Arctic and weakened westerlies over the mid- and low latitudes of Asia. The former significantly enhances baroclinicity over the Arctic, which dynamically contributes to increased frequency of anomalous low surface pressure during summer along with decreased frequency over high latitudes of Eurasia and North America. The latter is exhibited by sustained high pressure anomalies in the mid- and low troposphere that dynamically facilitate the occurrence of East Asian heat waves. A systematic northward shift of Asian zonal winds dynamically links Arctic cold anomalies with East Asian heat waves and produces a seesaw structure in zonal wind anomalies over the Arctic and the Tibetan Plateau (the third pole). Evidence suggests that enhanced Arctic westerlies may provide a precursor to improve predictions of the East Asian winter monsoon, though the mechanism for this lag association is unclear. |
英文关键词 | Atmospheric circulation Dynamics Teleconnections |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000457325500004 |
WOS关键词 | HIGH-TEMPERATURE ; EXTREME WEATHER ; HOT SUMMER ; CHINA ; CIRCULATION ; TELECONNECTIONS ; SEA |
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/21230 |
专题 | 气候变化 |
作者单位 | 1.Fudan Univ, Dept Atmospher & Ocean Sci, Shanghai, Peoples R China; 2.Fudan Univ, Inst Atmospher Sci, Shanghai, Peoples R China; 3.Woods Hole Res Ctr, Falmouth, MA USA |
推荐引用方式 GB/T 7714 | Wu, Bingyi,Francis, Jennifer A.. Summer Arctic Cold Anomaly Dynamically Linked to East Asian Heat Waves[J]. JOURNAL OF CLIMATE,2019,32(4):1137-1150. |
APA | Wu, Bingyi,&Francis, Jennifer A..(2019).Summer Arctic Cold Anomaly Dynamically Linked to East Asian Heat Waves.JOURNAL OF CLIMATE,32(4),1137-1150. |
MLA | Wu, Bingyi,et al."Summer Arctic Cold Anomaly Dynamically Linked to East Asian Heat Waves".JOURNAL OF CLIMATE 32.4(2019):1137-1150. |
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