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| Spatio-temporal variation characteristics of dust-storm in Alaxan region of Inner Mongolia Autonomous region |
| Dong Zhi1,Gu Yu2,Li Hongli1 |
| 1.Forestry College of Shandong Agriculture University,271018,Tai'an,Shandong;2.Environmental Monitor Central Station of Inner Mongolia Autonomous Region,010010,Huhhot:China |
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Abstract Based on the observed dust-storm data of Alaxan region of Inner Mongolia from 1961 to 2003,the spatial distribution characteristics,seasonal and yearly and decadal temporal variation characteristics and the cause of dust storm were analyzed.The results showed as followed: The dust-storm-days radiation decreased from Guaizi lake as center to other area all around in spatial,and the dust storm occurred frequently in the north and east and less in the west and south of this region;the days of dust storm took on more in spring and summer,but less in autumn and winter,the years which was more than average days of dust storm occurring was few in yearly during 43 years,the dust-storm-days occurring was most in 20 century 70's,and it had trend to decline after 70's.The variation of the dust-storm-days is in response to some special climate variation,geographical situation and environment,the relationship between dust-storm-days and strong-wind-days has been positive correlation,and the intensity of dust-storm-days negatively correlated with the air temperature and precipitation of last year,further more,the linear relation was accorded with between average monthly days of dust-storm and average monthly strong-wind-days,the correlation coefficient is 0.988 5.The result can provide science gist to preventing and controlling the dust-storm for Alaxan region.
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Received: 13 July 2007
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