DOI: 10.1007/s00382-013-1784-y
Scopus记录号: 2-s2.0-84894378025
论文题名: On the yearly phase delay of winter intraseasonal mode in the western United States
作者: Wang S.-Y. ; Gillies R.R. ; van den Dool H.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 42, 期: 2017-05-06 起始页码: 1649
结束页码: 1664
语种: 英语
英文摘要: In the western United States, persistent and recurrent flow patterns not only modulate precipitation events but also result in prolonged surface inversion episodes. In this region, the frequency of persistent ridge/trough events ranges between 20 and 40 days, well within the intraseasonal timescale. Based on NCEP reanalysis data starting at 1949, with a focus on the interior West, we observed that episodes of prolonged ridge/trough events appear to occur about a week later every year and resets every 5-7 years-a previously undocumented phenomenon examined herein. Diagnostic analyses indicate that the interplay between regional intraseasonal flow patterns and the North Atlantic Oscillation (NAO) alternates the preferred timeframe for the persistent ridge/trough events to occur. This may result from different phases of the NAO shifting the winter mean ridge and such shifts modulate the occurrence and timing of persistent ridge/trough events. When the timing changes evolve around the quasi-6 years cycle of the NAO, the resultant evolution forms what appears to be a steady phase delay in the ridge/trough events year after year. These results are a further step in disclosing the multiple-scale interaction between intraseasonal and interannual modes and its regional climate/weather impact. © 2013 Springer-Verlag Berlin Heidelberg. 资助项目: NASA, National Aeronautics and Space Administration
; Bureau of Reclamation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54281
Appears in Collections: 过去全球变化的重建
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作者单位: Utah Climate Center, Utah State University, Logan, UT, United States; Department of Plants, Soils and Climate, Utah State University, 4820 Old Main Hill, Logan, UT, 84322, United States; NOAA/NWS/NCEP/Climate Prediction Center, College Park, MD, United States
Recommended Citation:
Wang S.-Y.,Gillies R.R.,van den Dool H.. On the yearly phase delay of winter intraseasonal mode in the western United States[J]. Climate Dynamics,2014-01-01,42(2017-05-06)