Figure 2From: The trend of natural illuminance levels in 14 Chinese cities in the past 50 yearsInter-annual variation in annual total illuminance in typical Chinese light-climate regions and Sen's slope trend analysis. (a) Erenhot and Beijing, (b) Changchun and Guangzhou, (c) Urumchi and Heihe, (d) Xian and Xining, (e) Kunming and Changsha, (f) Shanghai and Chongqing, and (g) Fuzhou and Yushu.Back to article page