Staff members and soldiers de-ice the landing field of Kunming airport, capital of southwest China's Yunnan Province, on Dec. 16, 2013. Kunming, the Spring City, witnessed heavy snowfall from Dec. 15 to early Dec. 16, due to the advent of a severe cold air front. Snow began to affect the airport at 9:00 a.m. on Dec. 15. The airport has temporarily closed. [Xinhua]