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34°N 32°N Sunny day Boundary layer height (a) m 34°N 32°N Boundary layer height Cloudy day (b) 30°N 30°N Chengdu Chengdu 28°N 26°N 96°E 98°E 100°E 102°E 104°E 106°E 108°E 110°E Boundary Layer Height (m) 28°N 26°N 96°E 98°E 100°E 102°E 104°E Boundary Layer Height (m) ΕΠ 106°E 108°E 110°E 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 hmax was higher on sunny days than on cloudy days Fig. 3. Distribution of the boundary layer height in the Sichuan Basin on (a) sunny and (b) cloudy days in winter 2017-2018. The oval outline is the Sichuan Basin and the red line is the border of the Tibetan Plateau.

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