DOI: 10.1175/JCLI-D-17-0147.1
Scopus记录号: 2-s2.0-85040553644
论文题名: Tropical-extratropical interactions associated with East Asian cold air outbreaks. Part II: Intraseasonal variation
作者: Abdillah M.R. ; Kanno Y. ; Iwasaki T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 2 起始页码: 473
结束页码: 490
语种: 英语
英文关键词: Cold air surges
; Extratropics
; Intraseasonal variability
; Madden-Julian oscillation
; Tropics
; Winter/cool season
Scopus关键词: Cams
; Climate change
; Mechanical waves
; Regression analysis
; Tropical engineering
; Tropics
; Wind effects
; Cold air
; Extratropics
; Intraseasonal variability
; Madden-Julian oscillation
; Winter/cool seasons
; Climatology
; atmospheric wave
; cold air
; convection
; extratropical cyclone
; geopotential
; Madden-Julian oscillation
; Rossby wave
; seasonal variation
; tropical meteorology
; Far East
; Pacific Ocean
; Pacific Ocean (West)
英文摘要: Intraseasonal variations of East Asian cold air outbreaks (CAOs) in relation to the tropical atmosphere during 34 winters (DJF) are investigated. This study is a continuation of Part I, which discussed the interannual variability of East Asian CAOs. Two types of quantitative East Asian CAOs, western and eastern CAOs, are examined. Their variations are identified by the zonal integration of equatorward flux of cold air mass (CAM) below 280 K at 45°N over 90°-135°E and 135°E-180°. A day-lagged regression analysis reveals that peaks of intraseasonal western and eastern CAO events are preconditioned by large-scale tropical convection anomalies resembling particular phases of the Madden-Julian oscillation (MJO). Western CAO events tend to occur when the convective phase of the MJO crosses over the Maritime Continent. In contrast, eastern CAO events are triggered by the MJO over the western Pacific. Observations of MJO-related atmospheric anomalies indicate the important roles of poleward Rossby wave trains in affecting extratropical East Asian CAOs. The barotropic Rossby waves develop negative geopotential height anomalies in midlatitude East Asia, which then induce a low-level equatorward cold airflow. Several experiments in an atmospheric model using prescribed MJO-like heating anomalies demonstrate that the Maritime Continent MJO and the western Pacific MJO clearly affect the equatorward CAM flux over the western and eastern CAO regions, respectively. Compared with the western CAO, the eastern CAO shows a more robust response to the MJO because of stronger wave activity during the western Pacific MJO. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111729
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan
Recommended Citation:
Abdillah M.R.,Kanno Y.,Iwasaki T.. Tropical-extratropical interactions associated with East Asian cold air outbreaks. Part II: Intraseasonal variation[J]. Journal of Climate,2018-01-01,31(2)