DOI: 10.1175/JCLI-D-17-0833.1
Scopus ID: 2-s2.0-85053046127
Title: Strong modulation of the pacific meridional mode on the occurrence of intense tropical cyclones over the western North Pacific
Author: Gao S. ; Zhu L. ; Zhang W. ; Chen Z.
Source Publication: Journal of Climate
ISSN: 8948755
Publishing Year: 2018
Volume: 31, Issue: 19 pages begin: 7739
pages end: 7749
Language: 英语
Keyword: Climate classification/regimes
; Climate variability
; Tropical cyclones
Scopus Keyword: Hurricanes
; Mechanical waves
; Tropics
; Climate classification/regimes
; Climate variability
; Positive correlations
; Relative vorticity
; Rossby wave response
; Tropical cyclone
; Vertical wind shear
; Western North Pacific
; Storms
English Abstract: This study finds a significant positive correlation between the Pacific meridional mode (PMM) index and the frequency of intense tropical cyclones (TCs) over the western North Pacific (WNP) during the peak TC season (June-November). The PMM influences the occurrence of intense TCs mainly by modulating large-scale dynamical conditions over the main development region. During the positive PMM phase, anomalous off-equatorial heating in the eastern Pacific induces anomalous low-level westerlies (and cyclonic flow) and upper-level easterlies (and anticyclonic flow) over a large portion of the main development region through a Matsuno-Gill-type Rossby wave response. The resulting weaker vertical wind shear and larger low-level relative vorticity favor the genesis of intense TCs over the southeastern part of the WNP and their subsequent intensification over the main development region. The PMM index would therefore be a valuable predictor for the frequency of intense TCs over the WNP. © 2018 American Meteorological Society. Citation statistics:
Document Type: 期刊论文
Identifier: http://119.78.100.158/handle/2HF3EXSE/110681
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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Affiliation: Key Lab. of Meteorological Disaster of Ministry of Education, Nanjing Univ. of Information Science and Tech., Joint International Research Laboratory on Climate and Environment Change, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing, China; IIHR-Hydroscience and Engineering, The University of Iowa, Iowa City, IA, United States
Recommended Citation:
Gao S.,Zhu L.,Zhang W.,et al. Strong modulation of the pacific meridional mode on the occurrence of intense tropical cyclones over the western North Pacific[J]. Journal of Climate,2018-01-01,31(19)