Weakening of annual temperature cycle over the Tibetan Plateau since the 1870s.

The highly significant correlation ( r =0.81, n =59, P <0.0001) between the Qamdo and regional residual series indicates the representativeness of the station record for larger spatial scales.

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Overall, a slightly increasing trend is recorded before the 1870s (0.21 °C per 100 years from 1700 to 1873) and is replaced by an almost threefold negative trend thereafter (−0.59 °C per 100 years).

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The year 1863 indicates the starting point of an increasing trend, while 1874 and 1955 mark the start of trend decreases.

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