关键词: 关键词：乌鲁木齐, 不同海拔高度, 雾, 时空分布

Abstract: Based on the meteorological observations from 5 national meteorological stations in Urumqi, the temporal and spatial distribution characteristics of fogs in different altitude areas were analyzed. The results are as follows: (1) Foggy days was majorly influenced by altitude and terrain, and annual foggy days mostly appeared in alpine, followed by north plain area. (2) The foggy days in plain, urban and valley areas mainly appeared in winter, and it mainly appeared in spring in mid-mountain, while it mainly appeared in summer in alpine belt. Monthly variation of foggy days in urban plain, urban and valley presented a single peak distribution, and the peak values appeared from November to March next year, and foggy days in mid-mountain and alpine belt presented a double peak distribution, and the peak values occurred in spring and autumn. (3) In the past 58 years, annual, seasonal and monthly foggy days in plain and urban area increased significantly, but it decreased significantly in mountain area. (4) The fog in different altitude areas in Urumqi was influenced by different meteorological factors because of its different type and occurring season. In the past 58 years, precipitation and temperature increased, wind speed decreased during the fog season (from November to February) in plain area, which resulted in a corresponding increase of foggy days. The temperature increased during the fog season (from May to September) in mountain area, which resulted in a corresponding decrease of foggy days.

Key words:  Urumqi, different altitudes, fog, temporal and spatial distribution