Abstract
To disclose the relation between the sandstorms change and the temperature changes, a case study in the desert area in northwestern china is investigated. The results showed that: the instability of climate in Minqin desert area is enhancing in the arid desert region in northwest China. Mainly as follows: Variation the annual extreme maximum temperature increasing. Variation of extreme minimum temperature also an increasing trend. Average visibility of sandstorms significantly reduced and the fluctuation trend increased significantly. In the past two years, there have been some unusual climate events in other regions in China. They reflect the fact that the deterioration of the stability of the climate change. The instability of the climate change impact on human life and production is increased more than global warming, more worthy of global concern.
Highlights
Global warming is a hot topic worldwide
The 4th evaluation report by IPCC showed that from 1906 to 2005, the average air temperature in the world rose by 0.74°C,and the average temperature in the latter half of the 20th century was the highest in the last 1300 years (IPCC, 2007)
The study by Chinese scholars indicated that the increasing /decreasing of rainfalls in the arid areas in northwest China was, to some extent, related to the global temperature rising/dropping (Leng et al, 2007; Jin et al, 2005)
Summary
Global warming is a hot topic worldwide. The 3rd evaluation report by IPCC (Intergovernmental Panel on Climate Change) indicated that the world’s average temperature in the 20th centaury rose by 0.6±0.2°C, with the warmest period of 1980s and 1990s (Houghton et al, 2001). The study by Chinese scholars indicated that the increasing /decreasing of rainfalls in the arid areas in northwest China was, to some extent, related to the global temperature rising/dropping (Leng et al, 2007; Jin et al, 2005). Linear regression was used to analyze the changing trends of average temperature, the maximum/minimum temperatures, precipitation and air humidity. The maximum temperature during 19612009 showed an insignificant rising trend (p>0.05) (Fig. 2a), with the rising rate of 0.10°C/ (10a). The inter-annual difference of the maximum temperature from 1961 to 2009 displayed a significant increasing trend (p0.05) (Fig. 3a) at the rate of -0.19°C/(10a). The inter-annual difference of minimum temperature during 19612009 displayed an insignificant increasing trend (p>0.05) (Fig. 3b). The average visibility during sandstorm events was negatively related to the temperature in May in a comparatively significant way (α
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