摘要
中国西北地区生态环境极为脆弱,由于常年水资源不足,荒漠化成为该区域主要的生态环境问题。根据诸多学者对西北地区的研究,总结了我国西北地区生态环境与气候变化的特征,以及未来发展趋势。由于气候、环境变化及沙尘暴频次之间存在着一定的耦合关系,在此基础上,通过对影响沙尘暴频次的气候因子与其相关性研究的简要阐述,并结合相关论点,来探讨西北地区气候与环境变化如何影响沙尘暴的发生发展。相关研究表明,西北地区的大风、降水、下垫面状况等都直接影响着沙尘暴的发生发展,沙尘暴发生的频率和强度与沙尘源区的状况及其气候与生态环境变化都具有密切联系。其中,在一定的下垫面条件下,大风是影响较大的因子,降水的增加对沙尘暴有一定的抑制作用,气温通过大气环流的形式间接影响沙尘暴,土壤湿度则是通过改变植被覆盖、地表状况来影响沙尘暴。
According to many scholars’studies on the Northwest China,this article summed up the ecological environment,climate change features and trends in the Northwest China. Due to some coupling relationship existing between climate,environmental change and sandstorm frequency,the paper briefly described some climatic factors influencing dust storm frequency,and combined with the relevant arguments to explore the climate and environment changes how to impact on occurrence and development of sandstorm in Northwest China. Many researches show that the development of dust storms is directly affected by the wind,precipitation and status of underlying surface,etc. The frequency and intensity of dust storms are closely related to the natural conditions and climate of sandstorm sources,and gale is a bigger influence factor under certain underlying surface condition. The increase of precipitation has a certain inhibitory effect on sandstorm,the temperature has the indirect effect through atmospheric circulation on duststorm,and soil moisture’s influence on sandstorm by changing the vegetation cover,surface condition.
出处
《干旱气象》
2010年第4期467-474,共8页
Journal of Arid Meteorology
基金
国家自然科学基金项目"西北沙尘暴关键区近地面起沙特征的观测与数值研究"(40645027)
973计划前期研究专项课题"民勤的生态变化对(风蚀)起沙影响的特征观测与数值基础研究"共同资助
关键词
西北地区
气候变化
生态环境
沙尘暴
Northwest China
climate change
ecological environment
dust storm
