DOI: 10.1175/JCLI-D-16-0513.1
Scopus记录号: 2-s2.0-85020113188
论文题名: Variations of Northern Hemisphere storm track and extratropical cyclone activity associated with the Madden-Julian oscillation
作者: Guo Y. ; Shinoda T. ; Lin J. ; Chang E.K.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 13 起始页码: 4799
结束页码: 4818
语种: 英语
英文摘要: This study investigates the intraseasonal variations of the Northern Hemispheric storm track associated with the Madden-Julian oscillation (MJO) during the extended boreal winter (November-April) using 36 yr (1979- 2014) of reanalysis data fromERA-Interim. Twomethods have been used to diagnose storm-track variations. In the first method, the storm track is quantified by the temporal-filtered variance of 250-hPa meridional wind (vv250) ormean sea level pressure (pp). The intraseasonal anomalies of vv250 composited for eightMJOphases are characterized by a zonal band of strong positive (or negative) anomaliesmeandering from the Pacific all the way acrossNorthAmerica and theAtlantic into northern Europe,withweaker anomalies of opposite sign at one or both flanks. The results based on pp are consistent with those based on vv250 except for larger zonal variations, which may be induced by surface topography. In the second method, an objective cyclone-tracking scheme has been used to track the extratropical cyclones that compose the storm track. The MJO-composite anomalies of the ''accumulated'' cyclone activity, a quantity that includes contributions from both the cyclone frequency and cyclonemean intensity, are very similar to those based on pp. Further analysis demonstrates that major contribution comes from variations in the cyclone frequency. Further analysis suggests that the intraseasonal variations of the stormtrack can be primarily attributed to the variations of themean flowthat responds to the anomalousMJO convections in the tropics, with possible contribution also from the moisture variations. © 2017 American Meteorological Society. 资助项目: NOAA, National Oceanic and Atmospheric Administration
; NOAA, National Oceanic and Atmospheric Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48863
Appears in Collections: 气候变化与战略
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作者单位: Department of Physical and Environmental Sciences, Texas A and M University-Corpus Christi, Corpus Christi, TX, United States; Department of Geography, Ohio State University, Columbus, OH, United States; School of Marine and Atmospheric Sciences, Stony Brook University, State University of New York, Stony Brook, NY, United States
Recommended Citation:
Guo Y.,Shinoda T.,Lin J.,et al. Variations of Northern Hemisphere storm track and extratropical cyclone activity associated with the Madden-Julian oscillation[J]. Journal of Climate,2017-01-01,30(13)