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Structure and variability of the tropical tropopauseare presented using radio occultation measurements byCHAMP/GPS (CHAllenging Mini satellite Payload/Global Positioning System) from May 2001 to December2004 (with a total of 175,149 occultations). The tropopauseheights defined by both lapse rate and cold pointgenerally show large-scale, off-equatorial maxima(tropopause increase at 20°N or S than at equator), andsometimes even a high tropopause for about 0.3 to 0.65km (on an average) at 20°N and S simultaneously thanat the equator along a particular meridian, in contrast toour previous knowledge. Although this feature hasalready been reported partially during the summermonsoon season, the present study shows the seasonaland geographical distributions of the tropical tropopausecomprehensively using a new promising observationaltechnique. In addition, the vertical shape of thetropopause is found to be sharp in the equatorial regionand broad in the subtropics especially in northernwinter. Possible mechanisms are discussed in light ofdynamical and radiative processes

New Characteristics of the Tropical Tropopause Revealed by CHAMP/GPS Measurements