Intraseasonal variations in the tropical tropopause temperature revealed by cluster analysis of convective activity

Space‐time variations of the tropical convective activities and temperatures around the tropical tropopause associated with the intraseasonal oscillation (ISO) are investigated using outgoing longwave radiation (OLR) data from the National Oceanic and Atmospheric Administration and atmospheric field...

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Veröffentlicht in:	Journal of geophysical research. Atmospheres 2013-05, Vol.118 (9), p.3545-3556
Hauptverfasser:	Nishimoto, Eriko, Shiotani, Masato
Format:	Artikel
Sprache:	eng
Schlagworte:	Atmospherics Cluster analysis Clusters Dehydration Earth, ocean, space El Nino Exact sciences and technology External geophysics Geophysics intraseasonal oscillation La Nina Low temperature Madden-Julian oscillation Meteorology Oscillations Propagation Southern Oscillation Strength Temperature Tropical environments tropical tropopause layer Tropopause tropopause temperature Weather forecasting
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Beschreibung
Zusammenfassung:	Space‐time variations of the tropical convective activities and temperatures around the tropical tropopause associated with the intraseasonal oscillation (ISO) are investigated using outgoing longwave radiation (OLR) data from the National Oceanic and Atmospheric Administration and atmospheric fields from the European Centre for Medium‐range Weather Forecasts Interim reanalysis data. By performing cluster analysis using the locus of convective activities observed in the unfiltered OLR field, the 72 ISO events selected during the southern summers from 1979–2011 are mainly grouped into four clusters. Two of the clusters exhibit the slow (
ISSN:	2169-897X 2169-8996
DOI:	10.1002/jgrd.50281