| 祁连山东段全新世与现代水热组合特征研究 |
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| 引用本文： | 邬光剑,潘保田,管清玉,刘志刚,王义祥.祁连山东段全新世与现代水热组合特征研究[J].地理科学,2000,20(2):160-165. |
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| 作者姓名： | 邬光剑 潘保田 管清玉 刘志刚 王义祥 |
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| 作者单位： | 兰州大学地理系,甘肃,兰州,730000 |
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| 基金项目： | 国家自然科学基金!（49731010），教育部重点项目 |
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| 摘 要： | 位于祁连山北麓的扁都口和哈溪记录了该地区的全新世气候变化。采用磁化率、有机碳含量和碳酸钙含量作为降水指标，其记录的水分变化与冰芯及其他记录的对比，显示了地区全新世水热组合变化的特征。传统的大暖期鼎盛阶段并非本研究的气候最宜期。５．２～４．０ｋａＢ．Ｐ。．本区的环境相当优越，是气候最宜期。４．０ｋａＢ．Ｐ．存在一次比３．０ｋａＢ．Ｐ．明显的气候恶化，地层和剖面记录突出。２．０～１．０ｋａＢ．Ｐ．是低
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| 关 键 词： | 祁连山 全新世 水热组合特征 气候变化 古气候 |
Study on Hydro-Thermal Characteristic of Eastern Qilian Mountains in Holocene and Present |
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| WU Guang-jian,PAN Bao-tian,GUANG Qing-yu,LIU Zhi-gang,WANG Yi-xiang.Study on Hydro-Thermal Characteristic of Eastern Qilian Mountains in Holocene and Present[J].Scientia Geographica Sinica,2000,20(2):160-165. |
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| Authors: | WU Guang-jian PAN Bao-tian GUANG Qing-yu LIU Zhi-gang WANG Yi-xiang |
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| Abstract: | Biandukou and Haxi section recorded climatic changes in Holocene, Eastern Qilian Mountains. Susceptibility, organic carbon content and CaCO_3 content are used as excellent proxies to summer monsoon, mainly the precipitation. Compared with the Dunde ice-core record, used as the thermal proxy, here we can rebuild the hydro-thermal characteristic in Holocene in this region. During the 7. 2 - 6. 0 Ka B. P., in eastern China and many other regions, climate characteristic was high temperature and high precipitation. But, in eastern Qilian Mountains, this period was not the optimum, it's only relatively suitable. The climate optimum took place during 5. 2 - 4. 0 ka B. P., not in the same time with Megathermal Maximum. Significant environment deterioration took place in 4. 0 ka B. P. and 3. 0 ka B. P., but the former was more distinct than the latter. So we took 4. 0 ka B. P. as the boundary of the middle Holocene and the late. Changes of ancient civilizations serviced as another proof for climatic changes. In 2. 0 - 1. 0 ka B. P., scores of climatic proxies showed another climate suitable period, but the leaching depth of CaCO_3 was shallow and the Dunde ice-core recorded the drop of temperature. Analysis of modern weather data shows that humidity has an incline to drop beyond a certain high temperature in arid and semi-arid region. While in subhumid regions, humidity increases with the increase of temperature and this may give the possibility of the assembly of high temperature and high humidity as now as in the middle Holocene(7. 2 - 6. 0 ka B. P. ). Environment qualities in arid and semi-arid regions mainly depend on water since it is the most important in all the factors. So temperature and humidity would not reach their maximum simultaneously in the studied area. |
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| Keywords: | Qilian Mts Holocene Climatic change Hydro - thermal characteristic |
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