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SW: →Tropical troposphere: Typo
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 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.
Moreover, models predict higher temperatures in the upper tropical troposphere with long-term warming, no matter whether the forcing is anthropogenic (greenhouse gases) or natural (solar) [http://www.realclimate.org/index.php/archives/2007/12/tropical-troposphere-trends/#more-509]. As noted in the section below, it is the combination of tropospheric warming and startospheric cooling that most clearly distinguishes greenhouse gas induced warming from that resulting from natural external forcings.
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]
