关键词: 沙尘暴, 变化特征, 空间分布

Abstract: Based on The Time Series of Strong Sand-Dust Storm in China and the Supporting Dataset, the temporal and spatial change of sand-dust storms in China during 1958—2007 was analyzed. The results showed that the variation of the station-hours of sand-dust storms in China presented a decreasing tendency and experienced two periods of rapid decease, two periods of significant oscillation and two periods of slow decease, and each period was about 8 years long. The mean value of station-hours during 1983—2007 was 58.4% less than that during 1958—1982. The inter-annual variation of the average time of sand-dust storms was not obvious, while the average time of sand-dust storms had a double seasonal discrepancy. The frequently occurring time during 1983—2007 had delayed about 7 days compared with that during 1958—1982. The sand-dust storms occurring in north china was more than that in south China, and the sand-dust storms occurring in west china was more than that in east China, and Alxa and southern Tarim Basin were two frequently occurring centers. The temporal patterns of sand-dust storms were significantly different for different regions. There was an increasing tendency in the northwest part of Otindag Sandy Land and the northwest part of Qaidam Basin despite the decreasing tendency nationwide. The isoline of sand dust-storm ending year moved northwards significantly and the distribution area had reduced.

Key words: sand-dust storm, change tendency, spatial distribution