DOI: 10.1002/joc.5250
论文题名: Impact of the boreal summer quasi-biweekly oscillation on eastern north pacific tropical cyclone activity
作者: Zhao H. ; Raga G.B. ; Klotzbach P.J.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2018
卷: 38, 期: 3 起始页码: 1353
结束页码: 1365
语种: 英语
英文关键词: Eastern North Pacific
; Genesis potential index
; Quasi-biweekly oscillation
; Tropical cyclone
Scopus关键词: Hurricanes
; Storms
; Tropics
; Eastern north pacific
; Genesis potential index
; Intra-seasonal variabilities
; Madden-Julian oscillation
; Quasi-biweekly oscillation
; Tropical cyclogenesis
; Tropical cyclone
; Tropical cyclone activity
; Climate change
; climate oscillation
; cyclogenesis
; relative humidity
; seasonal variation
; summer
; tropical cyclone
; vorticity
; Pacific Ocean
; Pacific Ocean (North)
英文摘要: Several studies have focused on the impact of the Madden-Julian Oscillation (MJO, with a period between 30 and 60 days) on boreal summer tropical cyclone (TC) activity over the Eastern North Pacific (ENP) basin. The quasi-biweekly oscillation (QBWO), with a period of about 20 days, is another dominant mode of intra-seasonal variability during the boreal summer over the ENP basin. There have been fewer studies focused on the influence of the QBWO on tropical cyclogenesis over the ENP basin. The exploratory analyses performed in this study suggest that the QBWO has a strong impact on boreal summer ENP TC activity, with enhanced TC activity during the convectively active phase. The significant increase (decrease) of tropical cyclogenesis events during the convectively active (inactive) QBWO phase is found to be closely associated with the strengthening (weakening) of the low-level cyclonic circulation and increasing (decreasing) mid-level relative humidity (vertical wind shear) over the ENP. Mid-level relative humidity and low-level vorticity are found to be the two most important players in modulating TC genesis location and frequency, based upon the analyses of the anomalous genesis potential index pattern and its magnitude associated with the QBWO. Associated with changes in TC location and large-scale steering flows, distinct difference in TC tracks during different QBWO phases can be readily found and thus cause substantial differences in basin-wide TC intensity. This study enhances our understanding of the modulation of intra-seasonal oscillations on boreal summer ENP TC activity and has the potential to aid in the sub-seasonal prediction of ENP TC activity. © 2017 Royal Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117121
Appears in Collections: 气候减缓与适应
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作者单位: Key Laboratory of Meteorological Disaster of the Ministry of Education Joint International Research Laboratory of Climate and Environment Change, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Pacific Typhoon Research Center, Earth System Modelling Center Nanjing University of Information Science and Technology, China; Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, Mexico City, Mexico; Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States
Recommended Citation:
Zhao H.,Raga G.B.,Klotzbach P.J.. Impact of the boreal summer quasi-biweekly oscillation on eastern north pacific tropical cyclone activity[J]. International Journal of Climatology,2018-01-01,38(3)