Influences of ENSO on Western North Pacific Tropical Cyclone Kinetic Energy and Its Meridional Transport

This study investigates the influences of ENSO on tropical cyclone (TC) kinetic energy and its meridional transport in the western North Pacific (WNP) using the TC wind field obtained after a method for removing TC vortices from reanalysis data is applied. Results show that ENSO strongly modulates T...

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Bibliographic Details
Published in:Journal of climate 2013-01, Vol.26 (1), p.322-332
Main Authors: Ha, Yao, Zhong, Zhong, Hu, Yijia, Yang, Xiuqun
Format: Article
Language:English
Subjects:
Atmospherics
Climate
Climate models
Climatology
Cold
Correlation
Cyclones
Datasets
Dipoles
Earth, ocean, space
El Nino
El Nino phenomena
El Nino-Southern Oscillation event
Energy
Exact sciences and technology
External geophysics
Hurricanes
Kinetic energy
La Nina
Marine
Meridional transport
Meteorology
Ocean circulation
Phases
Southern Oscillation
Statistical analysis
Storms, hurricanes, tornadoes, thunderstorms
Summer
Transport
Tropical climates
Tropical cyclones
Velocity
Vortices
Vorticity
Wind
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Summary:This study investigates the influences of ENSO on tropical cyclone (TC) kinetic energy and its meridional transport in the western North Pacific (WNP) using the TC wind field obtained after a method for removing TC vortices from reanalysis data is applied. Results show that ENSO strongly modulates TC kinetic energy and its meridional transport in the WNP, but their effects and regions differ. The TC kinetic energy is positively correlated with the Niño-3.4 index in the entire WNP, and its poleward transport is positively (negatively) correlated with the Niño-3.4 index in the eastern WNP (the western WNP and the South China Sea); these correlations are statistically significant. The maximum TC kinetic energy is located around 25°N, 135°E (25°N, 125°E) in the warm (cold) year, showing an east–west pattern during different ENSO phases. The meridional transport of TC kinetic energy exhibits a dipole pattern over the WNP, with the poleward (equatorward) transport in the eastern (western) WNP. Both poleward and equatorward transports strengthen (weaken) and shift eastward (westward) in El Niño (La Niña) years. Therefore, El Niño has strong influences on TC kinetic energy and its meridional transport.
ISSN:0894-8755
1520-0442
DOI:10.1175/jcli-d-11-00543.1