DOI: 10.1175/JCLI-D-16-0152.1
Scopus记录号: 2-s2.0-85017102639
论文题名: Tropical-extratropical interactions associated with east asian cold air outbreaks. Part I: Interannual variability
作者: Abdillah M.R. ; Kanno Y. ; Iwasaki T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 8 起始页码: 2989
结束页码: 3007
语种: 英语
Scopus关键词: Atmospheric thermodynamics
; Cams
; Climatology
; Heat convection
; Mechanical waves
; Nickel
; Oceanography
; Tropics
; Atmosphere-ocean interactions
; Cold air
; ENSO
; Interannual variability
; Winter/cool seasons
; Climate change
英文摘要: Interannual variability of winter-mean East Asian cold air outbreaks (CAOs) and its relationship with the tropical climate system during 56 boreal winters (DJF) are investigated. The magnitude of CAO is quantified as winter-mean equatorward cold airmass (CAM) flux below 280-K potential temperature across the 45°N latitude. EOF analysis shows that the interannual variation of East Asian CAOs is attributed mainly to the contributions from western and eastern CAOs. In particular, the western and eastern CAOs tend to be remotely forced by La Niña and El Niño events, respectively. The western and eastern CAOs have distinct climate variability. The western CAO, which is enhanced under the climatic anomalies of high pressure over northern Eurasia and low pressure over the western North Pacific, causes negative CAM anomalies over northern Eurasia and positive ones over midlatitude East Asia. In the tropical region, the western CAO negatively correlates with the eastern Pacific and Indian Ocean SST, both of which enhance precipitation over the Maritime Continent. On the other hand, the eastern CAO is enhanced by the strong Aleutian low and results in positive CAM anomalies in the western North Pacific and substantial negative anomalies in western North America. The eastern CAO positively correlates with the tropical SST anomalies and accordingly precipitation anomalies over the central Pacific. ENSO influences western and eastern CAOs through upper and poleward Rossby wave trains excited by convective anomalies over the Maritime Continent and central Pacific, respectively. © 2017 American Meteorological Society. 资助项目: JSPS, Japan Society for the Promotion of Science
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49714
Appears in Collections: 气候变化事实与影响
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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 I: Interannual variability[J]. Journal of Climate,2017-01-01,30(8)