DOI: 10.1002/joc.5548
论文题名: Atmospheric circulation patterns associated with persistent wet-freezing events over southern China
作者: Liao Z. ; Zhai P. ; Chen Y. ; Lu H.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2018
卷: 38, 期: 10 起始页码: 3976
结束页码: 3990
语种: 英语
英文关键词: blocking high pattern
; persistent wet-freezing event
; Rossby wave
Scopus关键词: Climatology
; Freezing
; Lakes
; Mechanical waves
; Troposphere
; Water vapor
; Wave energy conversion
; Arctic oscillations
; Atmospheric circulation patterns
; Blocking high pattern
; Lower troposphere
; Persistent wet-freezing event
; Qinghai Tibet plateau
; Rossby wave
; Temperature inversions
; Fighter aircraft
; air mass
; Arctic Oscillation
; atmospheric circulation
; cold air
; freezing
; precipitation (climatology)
; Rossby wave
; troposphere
; Bay of Bengal
; China
; Indian Ocean
; Lake Baikal
; Pacific Ocean
; Qinghai-Xizang Plateau
; Russian Federation
; Sea of Okhotsk
; South China Sea
; Urals
英文摘要: Persistent wet-freezing events (PWFEs), a typical type of compound extremes, combine adverse effects from both its precipitation and temperature components, thereby posing great threats to human society and ecosystem. Atmospheric circulation patterns that govern the occurrence and persistence of PWFEs over southern China are identified and classified, based on cases during 1980–2010. There are two dominating types of large-scale atmospheric circulation patterns responsible for PWFEs: a single blocking high type and a double blocking high type. The single blocking high type tends to occur under positive Arctic Oscillation (AO) phase, characteristics of a long-lived blocking high over the Lake Baikal in the middle troposphere favouring lower-level cold air masses penetrate southwards along a northeast–southwest route. Likewise, abundant water vapour advances northwards from the Bay of Bengal and the South China Sea, meeting cold air masses over southern China under the upper-level divergence caused by the intensified upper-level subtropical jet which prevails on top of the western Qinghai–Tibet Plateau. Locally, a stable temperature inversion structure is anchored in the lower troposphere. The double blocking high type features blocking highs over the Ural Mountains and the Sea of Okhotsk, along with an intensified trough between them. The upper-level subtropical jet over mid-latitude East Asia strengthens, providing divergence fields at upper troposphere. Low-level cold air masses move southwards from the Lake Baikal along a north route, converging with the water vapour transported from the Bay of Bengal to southern China by a low-level southwesterly jet. By contrast, the inversion layer is absent atop the region experiencing double blocking PWFEs. Regardless of event types, the duration of PWFEs is dedicated by Rossby wave energy dispersion through its role in maintaining blocking patterns during the PWFEs. © 2018 Royal Meteorological Society Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/116819
Appears in Collections: 气候减缓与适应
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作者单位: State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, China; University of Chinese Academy of Sciences, Beijing, China; Guangxi Climate Center, Nanning, China
Recommended Citation:
Liao Z.,Zhai P.,Chen Y.,et al. Atmospheric circulation patterns associated with persistent wet-freezing events over southern China[J]. International Journal of Climatology,2018-01-01,38(10)