Cluster Analysis of Typhoon Tracks. Part II: Large-Scale Circulation and ENSO

A new probabilistic clustering method, based on a regression mixture model, is used to describe tropical cyclone (TC) propagation in the western North Pacific (WNP). Seven clusters were obtained and described in Part I of this two-part study. In Part II, the present paper, the large-scale patterns o...

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Veröffentlicht in:Journal of climate 2007-07, Vol.20 (14), p.3654-3676
Hauptverfasser: Camargo, Suzana J., Robertson, Andrew W., Gaffney, Scott J., Smyth, Padhraic, Ghil, Michael
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container_end_page 3676
container_issue 14
container_start_page 3654
container_title Journal of climate
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creator Camargo, Suzana J.
Robertson, Andrew W.
Gaffney, Scott J.
Smyth, Padhraic
Ghil, Michael
description A new probabilistic clustering method, based on a regression mixture model, is used to describe tropical cyclone (TC) propagation in the western North Pacific (WNP). Seven clusters were obtained and described in Part I of this two-part study. In Part II, the present paper, the large-scale patterns of atmospheric circulation and sea surface temperature associated with each of the clusters are investigated, as well as associations with the phase of the El Niño–Southern Oscillation (ENSO). Composite wind field maps over the WNP provide a physically consistent picture of each TC type, and of its seasonality. Anomalous vorticity and outgoing longwave radiation indicate changes in the monsoon trough associated with different types of TC genesis and trajectory. The steering winds at 500 hPa are more zonal in the straight-moving clusters, with larger meridional components in the recurving ones. Higher values of vertical wind shear in the midlatitudes also accompany the straight-moving tracks, compared to the recurving ones. The influence of ENSO on TC activity over the WNP is clearly discerned in specific clusters. Two of the seven clusters are typical of El Niño events; their genesis locations are shifted southeastward and they are more intense. The largest cluster is recurving, located northwestward, and occurs more often during La Niña events. Two types of recurving and one of straight-moving tracks occur preferentially when the Madden–Julian oscillation is active over the WNP region.
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source American Meteorological Society; Jstor Complete Legacy; EZB-FREE-00999 freely available EZB journals
subjects Atmospheric circulation
Atmospheric circulation patterns
Climate change
Cluster analysis
Clustering
Cyclones
Datasets
Earth, ocean, space
El Nino
El Nino events
El Nino phenomena
El Nino-Southern Oscillation event
Exact sciences and technology
External geophysics
Hurricanes
La Nina
La Nina events
Long wave radiation
Madden-Julian oscillation
Marine
Meteorology
Monsoon trough
Monsoons
Probabilistic models
Radiation
Regression models
Research methodology
Sea surface
Sea surface temperature
Seasonal variations
Seasonality
Southern Oscillation
Statistical analysis
Statistical significance
Steering
Storms, hurricanes, tornadoes, thunderstorms
Summer
Surface temperature
Trajectories
Tropical climates
Tropical cyclones
Typhoon tracks
Typhoons
Vertical wind shear
Vorticity
Wind
Wind oscillations
Wind shear
Winds
title Cluster Analysis of Typhoon Tracks. Part II: Large-Scale Circulation and ENSO
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