DOI: 10.1002/2017JD026768
论文题名: Daily-scale planetary wave patterns and the modulation of cold season weather in the northern extratropics
作者: Xie Z. ; Black R.X. ; Deng Y.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期: 16 起始页码: 8383
结束页码: 8398
语种: 英语
英文关键词: extreme cold waves
; harmonic analysis
; northern annual mode
; planetary wave
; storm track
英文摘要: Tropospheric planetary waves, often linked to asymmetries in lower boundary forcing, significantly modulate atmospheric blocking and storm track structures that are, in turn, linked to extreme surface weather events. Day-to-day variability in the planetary scale circulation, taken as wave numbers 1 to 5 in the daily 500 hPa geopotential heights, and the associated impact on storm tracks and regional weather are studied for the period 1950–2005. Six boreal cold-season distinct planetary wave patterns are identified via hierarchical cluster analysis. The first, second, and sixth patterns feature a prominent zonal wave number 1 structure, while the fourth and fifth patterns resemble the negative and positive phases of northern annular mode, respectively. The second pattern represents an amplification of the climatological mean wave structure, while the third pattern resembles the zonal wave number 3 pattern. A multitaper spectral analysis of the daily projection indices indicates that the planetary wave patterns are primarily intraseasonal in nature. The first (sixth) pattern combines the positive (negative) phase of the Pacific-North American teleconnection pattern and negative (positive) phase of the North Atlantic Oscillation, inducing poleward (equatorward) shifts in the Pacific storm track and a weakened (strengthened) Atlantic storm track. In contrast, the fourth (fifth) pattern results in a simultaneous equatorward (poleward) displacement of both storm tracks. Extreme cold waves over the continental United States (U.S.) are favored during occurrences of the fourth and sixth patterns. During episodes of the first pattern, increased rainfall prevails over much of the U.S., while precipitation anomalies induced by the other patterns are more regional in nature. ©2017. American Geophysical Union. All Rights Reserved. 资助项目: DE-SC0012554
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62612
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States; ICCES, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Xie Z.,Black R.X.,Deng Y.. Daily-scale planetary wave patterns and the modulation of cold season weather in the northern extratropics[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(16)