Spatiotemporal variation of climate of different flanks and elevations of the Qinling-Daba mountains in China during 1969-2018.

(1) Overall, a significant trend of warming was detected in all seasons over the past 50 years, with rates of increase of 0.347, 0.125, 0.200 and 0.302 °C/10a, in spring, summer, autumn and winter, respectively.

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For example, 97.06%, 88.24%, 94.12%, and 97.06% of stations in the western QDM were found to have a notable trend of increase in air temperature in spring, summer, autumn, and winter, respectively, whereas such trends were detected on the other flanks at less than 89.29%, 35.71%, 69.05%, 80.95% of stations, respectively.

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In spring, only Songpan station showed a trend of increase in precipitation, i.e., 7.63 mm/10a.

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Overall, an obvious trend of warming in different seasons has occurred over the previous 50 years in the QDM, but the rate of air temperature increase has varied markedly on different flanks and at different elevations.

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There was an increasing trend of seasonal air temperature at different elevations in different seasons in the QDM.

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