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Influence of ENSO on formation of tropical cloud clusters and their development into tropical cyclones in the western North Pacific
Author(s) -
Teng HsuFeng,
Lee ChengShang,
Hsu HuangHsiung
Publication year - 2014
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2014gl061823
Subject(s) - tropical cyclone , el niño southern oscillation , climatology , tropical cyclogenesis , tropical wave , productivity , convection , environmental science , geology , atmospheric sciences , geography , cyclone (programming language) , meteorology , field programmable gate array , computer science , computer hardware , economics , macroeconomics
This study analyzes the influence of El Niño–Southern Oscillation (ENSO) on the activity of tropical cloud clusters (TCCs) in the western North Pacific (WNP). A TCC must have at least one embedded mesoscale convective system and it must persist for more than 24 hours. In all, 2,248 TCCs were identified during July–October 1981–2009. While more (less) TCCs form in the eastern (western) part of the WNP during El Niño years than during normal years, the converse is true during La Niña years. The ratio of tropical cyclone (TC) numbers to TCC numbers (genesis productivity) was 27.3%, higher than found in previous study. TC genesis productivity does not correlate with the Oceanic Niño Index even in subregions of the WNP. The influence of ENSO on TC numbers in each subregion of the WNP was mainly due to changes in TCC number, not changes in TC genesis productivity.