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| 全新世浑善达克沙地粒度旋回及其反映的气候变化 | |
| 引用本文： | 张洪,靳鹤龄,苏志珠,孙忠.全新世浑善达克沙地粒度旋回及其反映的气候变化[J].中国沙漠,2005,25(1):1-7. |
| 作者姓名： | 张洪 靳鹤龄 苏志珠 孙忠 |
| 作者单位： | 1. 中国科学院,寒区旱区环境与工程研究所,甘肃,兰州,730000 2. 中国科学院,寒区旱区环境与工程研究所,甘肃,兰州,730000;兰州大学,资源与环境学院,甘肃,兰州,730000 3. 中国科学院,寒区旱区环境与工程研究所,甘肃,兰州,730000;山西大学,黄土高原研究所,山西,太原,030006 |
| 基金项目： | 国家重点基础研究发展规划——中国北方沙漠化过程及其防治研究(TG2000048701)，中国博士后科学基金(200303440)共同资助 |
| 摘 要： | 利用浑善达克沙地北部锡林浩特风成砂/古土壤剖面的粗颗粒含量、标准偏差、中值粒径、平均粒径和粘粒含量等气候代用指标,对浑善达克沙地10 ka以来的沉积物粒度进行了系统分析研究\.结果表明气候变化存在4个阶段:10.7～9.6 ka BP气候相对干冷;9.6～6 ka BP气候温暖湿润; 6～3.4 ka BP气候干冷暖湿波动频繁;3.4 ka BP以来气候以干旱为主。 |
| 关 键 词： | 浑善达克沙地 粒度 全新世 气候变化 |
| 文章编号： | 1000-694X(2005)01-0001-07 |
| 修稿时间： | 2004年1月10日 |
Climate Changes Revealed by Grain-size Cycles of Holocene in Hunshandake Desert |
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| ZHANG Hong.Climate Changes Revealed by Grain-size Cycles of Holocene in Hunshandake Desert[J].Journal of Desert Research,2005,25(1):1-7. | |
| Authors: | ZHANG Hong |
| Institution: | ZHANG Hong~ |
| Abstract: | The Hunshandake desert is located in the west of Inner Mongolia, China. This region is sensitive to climate change with annual temperature between 0.9~5.5 ℃ and annual precipitation between 240.3～422.6 mm. The samples were gotten at 5-cm intervals in the Xilinhaote section（43°52′36.6″N, 116°05′34.1″E）which is 2.8 m high and lies in the Hunshandake desert. In the laboratory the character of the grain-size composition and the changes of the grain-size parameters were analyzed. The relationships of the indicators of monsoon like Mz (mean particle diameter), Md (median size), D/SC (the ratio of the coarse sands to the sum of fine sands and clay), the coarse sands fraction(>63 μm), σ1 (standard deviation) and the clay fraction(<2 μm) with the monsoon variables were analyzed. The winter monsoon becomes strong when Mz, Md and the clay fraction become low, but D/SC and σ1 become high; on the contrary, the summer monsoon becomes strong when Mz, Md and the clay fraction become high, but D/SC and σ1 become low.According to the relationships, the climate changes since 10 ka BP could be divided into 4 stages: 10.7～9.6 cal ka BP, cold and arid; 9.6～6 cal ka BP, warm and humid; 6～3.4 cal ka BP, fluctuated between cold/arid and warm/humid; 3.4 cal ka BP to present, arid predominated. The climate changes in the Hunshandake desert are similar with other regions in China and in the world. It is mainly affected by the winter monsoon and the summer monsoon. |
| Keywords: | the Hunshandake Desert grain-size Holocene climate change |
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