| Characteristics of temporal and spatial variation of snow covering days and depth in east of Hexi Corridor |
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| DOI：10.7606/j.issn.1000-7601.2012.02.43 |
| Key Words: east of Hexi Corridor stations snow days snow depth evolution characteristics |
| Author Name | Affiliation | | LI Lingping | Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Key and Open Laboratory of Arid Change and Disaster Reduction of CMA, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou, Gansu 730020, China；
Wuwei Meteorological Bureau, Wuwei, Gansu 733000, China | | LIU Mingchun | Wuwei Meteorological Bureau, Wuwei, Gansu 733000, China |
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| Abstract: |
| The temporal-spatial distributing characteristics of snow cover were analyzed based on the conventional observation data of monthly snow cover days and depths of 5 stations in east of Hexi Corridor stations f
rom 1961 to 2007, The results show that in the spacial structure, because of altitude, geographical position, influence system, the distribution of snow cover depth and days decreasing from southeast to northwest, the number of snow cover days and depth in high altitude areas more than in low altitude areas, in mountain stations more than in plain; in the temporal chang, there is a decreasing trend in the observations on snow cover days and an increasing trend on snow cover depth, the maximum and minimum snow cover days occurrs on january and on september, the maximum and minimum snow cover depth occurrs on march and on december. In seasonal changes, the maximum number of snow cover days occurs in winter, seco
nd in spring, the least in autumn, the maximum of snow cover depth occurs in spring,second in autumn, the least in winter. On the attribution, the trends of snow cover depth and days in winter was the most important in annual change. It is found that the vibration periods of 6～7 a, 9～10 a and 2～3 a are displayed very clear of snow cover days before the mid 1990s and the vibration periods of 6～7 a and 2～3 a are displayed very clear behind the mid-1990s. and also found that the vibration periods of 6～7 a, 9～10 a and 2～3 a are displayed very
clear of snow cover depth before the mid 1970s and the vibration periods of 9～10 a, 12～13 a and 2～3 a are displayed clear from the mid-1970s to the mid-1990s, the vibration periods of 6～7 a and 2～3 a are displayed very clear behind the mid-1990s. |
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