DOI: 10.1175/JCLI-D-13-00399.1
Scopus记录号: 2-s2.0-84905186988
论文题名: Intraseasonal modulation of synoptic-scale disturbances and tropical cyclone genesis in the Eastern North Pacific
作者: Crosbie E.C. ; Serra Y.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 15 起始页码: 5724
结束页码: 5745
语种: 英语
Scopus关键词: Climatology
; Kinetics
; Moisture
; Storms
; Eastern north pacific
; Madden-Julian oscillation
; Regional model
; Subseasonal variability
; Synoptic climatology
; Tropical cyclogenesis
; Tropospheric moisture
; Vertical wind shear
; Hurricanes
; climate modeling
; climatology
; cyclogenesis
; kinetic energy
; Madden-Julian oscillation
; regional climate
; synoptic meteorology
; tropical cyclone
; wind shear
; Pacific Ocean
; Pacific Ocean (North)
英文摘要: The influence of the Madden-Julian oscillation (MJO) on synoptic-scale waves, important precursors to tropical cyclones and tropical cyclogenesis, is investigated using a regional model of the eastern North Pacific basin. Cyclogenesis frequency is evaluated with respect to the MJO using a combination of the regional model and the archive best-track data. The statistics of the regional model compare well to the data and suggest that the MJO predominantly deters cyclogenesis during the suppressed phase rather than enhances it during the active phase when compared to neutral conditions. Synoptic-scale variability of cloudiness and eddy kinetic energy and analysis of vortex track statistics show a consistent enhancement of wave strength during the active phases of the MJO supported by both barotropic energetics and tropospheric moisture availability. Vertical wind shear, of critical importance to cyclone development, also exhibits strong variability associated with the phase of the MJO but, contrary to synoptic activity and moisture, results in unfavorable conditions for cyclogenesis during the active phase of the MJO in the region. The result is for the MJO to enhance cyclogenesis frequency relative to neutral conditions during the early active phase but otherwise to result in suppressed activity. In addition to the basinwide longitudinal structure, the local MJO exhibits a distinct north-south structure not apparent in the global pattern but in agreement with recent studies of tropical eastern North Pacific subseasonal variability. © 2014 American Meteorological Society. 资助项目: NSF, National Science Foundation
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51396
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Atmospheric Sciences, University of Arizona, Tucson, AZ, United States
Recommended Citation:
Crosbie E.C.,Serra Y.. Intraseasonal modulation of synoptic-scale disturbances and tropical cyclone genesis in the Eastern North Pacific[J]. Journal of Climate,2014-01-01,27(15)