Abstract
Abstract Tropical cold point tropopause (CPT) characteristics have been calculated using ECMWF reanalyses and high resolution radiosonde soundings obtained in TOGA COARE as well as operational sounding data. It is found that ECMWF reanalyses are suitable for investigating the morphology of the tropical CPT and the variabilities of the tropopause over the entire Tropics, despite an almost constant one-side warm bias. The daily locations of the tropical coldest CPT are clustered over the western Pacific warm pool region in January and spread out longitudinally as the year progresses. During the Indian summer monsoon, the locations of the coldest CPT are deflected northward. The influences of the quasi-biennial oscillation (QBO) and the El Nino–Southern Oscillation (ENSO) on the tropical CPT have been separated using bivariate regression. The stratospheric zonal wind shear at 50 mb leads the variation in the tropical CPT temperatures by about 6 months. The QBO signature in the tropical CPT is mainly zonally ...
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