The Influence of El Niño–Southern Oscillation on Tropical Cyclone Activity in the Eastern North Pacific Basin

The interannual variability of tropical cyclone (TC) activity due to El Niño–Southern Oscillation (ENSO) in the main development region of the eastern North Pacific basin has received scant attention. Herein the authors classify years of El Niño, La Niña, and neutral conditions using the multivariat...

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Veröffentlicht in:Journal of climate 2015-03, Vol.28 (6), p.2459-2474
Hauptverfasser: Jien, Jerry Y., Gough, William A., Butler, Ken
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creator Jien, Jerry Y.
Gough, William A.
Butler, Ken
description The interannual variability of tropical cyclone (TC) activity due to El Niño–Southern Oscillation (ENSO) in the main development region of the eastern North Pacific basin has received scant attention. Herein the authors classify years of El Niño, La Niña, and neutral conditions using the multivariate ENSO index (MEI). Storm measurements of the net tropical cyclone activity index and power dissipation index are used to summarize the overall seasonal TC activity and TC intensity between 1971 and 2012. Both measures are found to be statistically dependent on the ENSO phases in the basin’s main development region. However, when the area is longitudinally divided, only the western portion of the development region experienced a significant difference (p< 0.05). Specifically, El Niño years are characterized by more frequent, more intense events compared to La Niña conditions for this subregion. Correlation analyses on the relationships between the MEI and both TC indices demonstrate correlations between ENSO and TC activity and intensity that are statistically significant (p< 0.05) only in the western region. These relationships have the potential to improve the short-term forecast of the local TC activity and intensity on a seasonal basis for public awareness and disaster preparation.
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source American Meteorological Society; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Jstor Complete Legacy
subjects Correlation analysis
Correlations
Cyclones
Cyclonic activity
El Nino
El Nino phenomena
El Nino-Southern Oscillation event
Energy dissipation
Environmental conditions
Global warming
Hurricanes
Influence
Interannual variability
La Nina
Ocean currents
Oscillation
Public awareness
Sea level
Sea surface temperature
Seasons
Southern Oscillation
Statistical analysis
Storm damage
Storms
Time series
Tropical cyclone activity
Tropical cyclone intensities
Tropical cyclones
Tropical regions
title The Influence of El Niño–Southern Oscillation on Tropical Cyclone Activity in the Eastern North Pacific Basin
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