| 天气与气候 |
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| Response of Sandstorm Transformation to Climate and Eco-environment Change in East Part of Northwest China |
CHEN Nan1,2, ZHAO Guang-ping1,2, CHEN Yu-ying1, ZHENG Guang-fen1, PENG Wei-geng3
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| 1.Gansu Arid Meteorology institute, China Metrological Administration, Lanzhou 730020, China; 2.Key Laboratory of Meteorological Disaster Preventing and Reducing of Ningxia, Yinchuan 750002, China; 3.Technology Department of Air Traffic Administration, Yinchuan Civil Aviation of China, Yinchuan 750002, China |
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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.
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Received: 08 May 2007
Published: 20 July 2008
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2008, Vol. 28 
