DOI: 10.1175/JCLI_D_12_00379.1
Scopus记录号: 2-s2.0-84886248255
论文题名: Dynamics and geometry of extratropical cyclones in the upper troposphere by a neighbor enclosed area tracking algorithm
作者: Inatsu M. ; Amada S.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 21 起始页码: 8641
结束页码: 8653
语种: 英语
Scopus关键词: Arctic oscillations
; Extratropical cyclones
; Interannual variability
; Morphological characteristic
; Northern Hemispheres
; Synoptic climatology
; Wavebreaking
; Wintertime climatology
; Algorithms
; Climatology
; Tracking (position)
; Troposphere
; Storms
; algorithm
; annual variation
; Arctic Oscillation
; climatology
; eddy
; Northern Hemisphere
; synoptic meteorology
; tropical cyclone
; troposphere
; wave breaking
英文摘要: This study shows that the morphological characteristics of upper-tropospheric extratropical eddies are closely related to the background flow in the Northern Hemisphere winter. Enclosed surfaces of 300-hPa relative vorticity are identified by using the neighbor enclosed area tracking algorithm, andthe periphery of these surfaces are approximated by ellipses. Eddies are classified into five categories according to the approximate ellipse. Eddies having an oblateness of less than 0.6 are classified as near circle, or are otherwise classified as northeast-southwest (NE-SW), northwest-southeast (NW-SE), north-south, or west-east, according to the direction of the major axis. In the wintertime climatology, NE-SW-oriented cyclones are collocated with the jet stream, while NW-SE-oriented cyclones mostly reside north of the jet. In interannual variability, moreover, the frequency of NE-SW cyclones is slightly correlated with the Arctic Oscillation (AO) index, while the frequency of NW-SE cyclones is highly anticorrelated with the AO index. This is consistent with positive feedback between horizontally slanted eddies and background flow, as has been shown in many previous studies. © 2013 American Meteorological Society. 资助项目: MEXT, Ministry of Education, Culture, Sports, Science, and Technology
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51584
Appears in Collections: 气候变化事实与影响
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作者单位: Graduate School of Science, Hokkaido University, Sapporo, Japan
Recommended Citation:
Inatsu M.,Amada S.. Dynamics and geometry of extratropical cyclones in the upper troposphere by a neighbor enclosed area tracking algorithm[J]. Journal of Climate,2013-01-01,26(21)