关键词: 沙尘暴转型, 生态/气候影响模型, 驱动, 西北地区东部

Abstract: The sandstorm data in last 50 years and the quantitatively retrieved vegetation cover data from NOAA/AVHRR NDVI data since 1981 in the east part of Northwest China, which combined with calibrated detailed land-use data, were used to synthetically analyze the ecological change feature and basic model, sandstorm frequency, duration, and threshold wind speed in the area. The results show that, since 1951 the sandstorm in the east of Northwest China experienced a transformation from less to more, the annual change mutation occurred in 1987, the annual amplitude of NDVI in the area was large and showed a slow decreasing trend, the general eco-environment showed a degenerating trend. Under this circumstance, the duration of sandstorm increased, the threshold wind speed decreased. Study based on the eco-climate model shows that the sandstorm duration and frequency in the east of Northwest China are different, climate change drove the sandstorm frequency change, and eco-environment change had a significant adjust and control effect on the sandstorm duration.

Key words: transformation of sandstorm, eco-climate model, driving factor, east part of Northwest China