DOI: 10.1016/j.atmosres.2018.07.023
Scopus记录号: 2-s2.0-85050682973
论文题名: Evolution mechanism of synoptic-scale EAP teleconnection pattern and its relationship to summer precipitation in China
作者: Wang L. ; Wang C. ; Guo D.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 214 起始页码: 150
结束页码: 162
语种: 英语
英文关键词: Circulation pattern
; East Asia-Pacific pattern
; Energy conversion
; Extreme precipitation
; Wave-activity flux
Scopus关键词: Energy conversion
; Potential energy
; Precipitation (meteorology)
; Statistical tests
; Troposphere
; Circulation patterns
; East Asia
; Extreme precipitation
; Middle and lower reaches of yangtze rivers
; Moisture flux convergences
; Summer precipitation
; Teleconnection patterns
; Wave-activity flux
; Fluxes
; atmospheric circulation
; energy use
; potential energy
; precipitation (climatology)
; summer
; synoptic meteorology
; teleconnection
; troposphere
; China
; Philippines
; Yangtze River
英文摘要: Using ERA-Interim reanalysis daily data and gridded precipitation dataset, the evolution mechanism of East Asia-Pacific (EAP) teleconnection pattern and its relationship to summer precipitation in China were investigated on synoptic timescales based on EOF analysis, composite analysis, and significance test. The results demonstrate that the evolution of synoptic-scale EAP pattern is identified as having a significant relationship with the energy propagation represented by the wave-activity flux (WAF). Such EAP-related WAFs show various features in different levels of the troposphere. In the lower troposphere, the WAF primarily points poleward from the Philippines, playing a vital role in triggering and maintaining the synoptic-scale EAP pattern. A middle tropospheric zonally distributed ridge/trough/ridge wave train provides a favorable westerly waveguide for the southeastward (eastward) energy propagation, converging with a relatively weak poleward WAF over mid-latitude (high-latitude) East Asia. Moreover, the upper-level EAP-related anomalies are partly influenced by two conspicuous eastward WAFs. One may favor the development of Okhotsk anticyclonic (positive) anomaly, and the other one related to the Silk-Road (SR) wave train along the Asian jet converges into the cyclonic (negative) anomaly to greatly strengthen it. Particularly, the highly efficient baroclinic energy conversion responsible for the self-maintenance of SR pattern is also crucial for reinforcing and maintaining this cyclonic anomaly for a prolonged period by extraction of available potential energy from basic flow. In addition, during EAP pattern lifetime, due to the strong moisture flux convergence and upper-level divergence, the long-lasting strong ascents of moist/warm air along a moist and thick layer, therefore induce the summer consecutive extreme precipitation in the middle and lower reaches of Yangtze River. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/108728
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Key Laboratory of Meteorological Disaster, Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Science and Technology Innovation Team on Climate Simulation and Forecast, Nanjing University of Information Science & Technology, Nanjing, 210044, China; State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, 100081, China
Recommended Citation:
Wang L.,Wang C.,Guo D.. Evolution mechanism of synoptic-scale EAP teleconnection pattern and its relationship to summer precipitation in China[J]. Atmospheric Research,2018-01-01,214