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SW: →Tropical troposphere: typo
The ISPM overview claims: "There is no significant warming in the tropical troposphere (the lowest portion of the Earth’s atmosphere), which accounts for half the world’s atmosphere, despite model predictions that warming should be amplified there." [see also ISPM 2.1c].
However, one of the two satellite-based tropospheric estimates (RSS) shows a trend of 0.18°C per decade. [AR4 Fig. 3.18] Moreover, as acknowledged in the ISPM, models predict amplified warming in the tropical '''upper troposphere''', not the tropical tropsphere troposphere as a whole. [ISPM 2.1c, AR4 10.3.4] There are no estimates for temperature trends in the upper troposphere in the data sets found in AR4.
The ISPM goes on: "One of the available satellite data sets shows trends consistent with increased warming at higher altitude in the tropics ... '''while others do not'''." [ISPM 2.1c]
