中国北方沙漠地区全新世气候变化的周期性探讨  

Holocene cyclic climate changes and desertifications in northern China

作　　者：李智佩[1] 岳乐平[1] 薛祥煦[1] 郭莉[2] 

机构地区：[1]西北大学地质系大陆动力学国家重点实验室,陕西西安710069 [2]中国地质调查局西安地质矿产研究所,陕西西安710054

出　　处：《干旱区地理》2007年第2期170-176,共7页Arid Land Geography

基　　金：中国地质调查局"中国三北地区荒漠化区域分类与发展趋势研究(20011230004)项目;大陆动力学国家重点实验室(西北大学)访问学者基金和陕西省教育厅专项科研计划项目毛乌素沙地全机关报世沙漠化周期性研究"

摘　　要：随着高精度全新世气候变化研究的深入,千、百年尺度上气候波动、周期性变化和气候事件不断被发现。北大西洋深海沉积物中发现的IRD事件、千年尺度上的约1500年周期性气候振荡已经被许多研究者共识,并在陆地湖泊、冰心乃至沙地和沙漠的沉积物中均有发现。百年尺度上的512年、400年、200年等周期性气候振荡还有待深入研究。研究表明,全新世以来,中国北方地区沙漠的扩大与缩小与全球气候的周期性变化具有密切的相关性,尤其是与千年尺度上的1500年的周期性震荡有关;数年-数十年尺度上的周期性气候振荡对我国沙尘暴的发生起着明显的控制作用。Along with the advances of high precision global climate change researches, climate fluctuations, periodicities and events on millennial and centennial scales are found. Ice-rifted debris （IRD） events which represent about 1 500 a cyclic climatic fluctuations found in North Atlantic oceanic sediments now have been recognized by most researchers, and evidences are found in continental lake, ice core, as well as dessert sediments. However, climate fluctuations on centennial scales at periodicities such as about 512 a, 400 a, 200 a need more evidences. The climate of desert area in northern China has experienced three stages since Holocene. The first stage shows the character of warming up with cooling intervals. The second stage is characterized by prevail high temperature and the last mainly show characteristics of cooling and fluctuating frequently. The sections in these areas formed in Holocene composed of inter-bedded aeolian sand and paleo-soil （dark loessial soil） or lacustrine sediments. Through the study of sections in the south margin of Gurbantunggut and Mu Us deserts, as well as in the north margin of Hunshandake desert, it is considered that the expanding and reducing of these deserts have 8 cycles during Holocene. Researches using antitheses between the ages of aeolian sands and IRD events show that the expanding of deserts is controlled clearly by Bond Cycles. The 4 cycles of Hulun Buir and Horqin desert expanding can also be compared to Bond Cycles. Therefore, it is considered that the expanding and reducing of desert during Holocene in northern China are closely related to cyclic global climate fluctuations, especially with that about 1500 a on millennial scale. However, the influence of climate change in centennial scale to desertification needs further studies. Furthermore, there exists about 42 a, 3 a and 6.7 a climate fluctuations on annual to decadal scales. These cyclic climate changes controlled clearly the occurrences of sandstorm in northern China in spring and early summer.

关 键 词：气候变化 周期性 沙漠演化 沙尘暴 

分 类 号：P467[天文地球—大气科学及气象学]