DOI: 10.1007/s00382-015-2956-8
Scopus记录号: 2-s2.0-84952927959
论文题名: Intraseasonal variability of air temperature over the mid-high latitude Eurasia in boreal winter
作者: Yang S. ; Li T.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 47, 期: 2017-07-08 起始页码: 2155
结束页码: 2175
语种: 英语
英文关键词: Extended-range forecast
; Mid-high latitude intraseasonal temperature variability
; Southeastward propagation
英文摘要: The intraseasonal oscillation (ISO) of air temperature over the mid- and high-latitude Eurasia in boreal winter was investigated by NCEP-NCAR reanalysis data. It is found that the intraseasonal temperature disturbances exhibit maximum variability near the surface in the region of 50°–75°N, 80°‒120°E and they propagate southeastwards at average zonal and meridional phase speeds of 3.2 and 2.5 m s−1, respectively. The low-level temperature signal is tightly coupled with upper-tropospheric height anomalies, and both propagate southeastward in a similar phase speed. A diagnosis of the temperature budget reveals that the southeastward propagation is primarily attributed to the advection of the temperature anomaly by the mean wind. A wave activity flux analysis indicates that the southeastward propagating wave train is likely a result of Rossby wave energy propagation. The source of the Rossby wave train appears at the high latitude Europe/Atlantic sector, where maximum wave activity flux convergence resides. During its southeastward journey, the ISO perturbation gains energy from the mean flow through both kinetic and potential energy conversions. A physics-based empirical model was constructed to predict the intraseasonal temperature anomaly over southeast China. The major predictability source is the southeastward-propagating ISO signal. The data for 1979‒2003 were used as a training period to construct the empirical model. A 10-yr (2004‒2013) independent forecast shows that the model attains a useful skill of up to 25 days. © 2015, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53526
Appears in Collections: 过去全球变化的重建
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作者单位: International Laboratory on Climate and Environment Change and Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Nanjing, China; International Pacific Research Center, Department of Atmospheric Sciences, University of Hawaii at Manoa, Honolulu, HI, United States
Recommended Citation:
Yang S.,Li T.. Intraseasonal variability of air temperature over the mid-high latitude Eurasia in boreal winter[J]. Climate Dynamics,2016-01-01,47(2017-07-08)