| 黄河源区冻土特征及退化趋势 |
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| 引用本文： | 金会军,王绍令,吕兰芝,何瑞霞,常晓丽,罗栋梁.黄河源区冻土特征及退化趋势[J].冰川冻土,2010,32(1):10-17. |
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| 作者姓名： | 金会军 王绍令 吕兰芝 何瑞霞 常晓丽 罗栋梁 |
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| 作者单位： | 中国科学院,寒区旱区环境与工程研究所,冻土工程国家重点实验室,甘肃,兰州,730000;中国科学院,寒区旱区环境与工程研究所,冻土工程国家重点实验室,甘肃,兰州,730000;中国科学院,寒区旱区环境与工程研究所,冻土工程国家重点实验室,甘肃,兰州,730000;中国科学院,寒区旱区环境与工程研究所,冻土工程国家重点实验室,甘肃,兰州,730000;中国科学院,寒区旱区环境与工程研究所,冻土工程国家重点实验室,甘肃,兰州,730000;中国科学院,寒区旱区环境与工程研究所,冻土工程国家重点实验室,甘肃,兰州,730000 |
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| 基金项目： | 中国科学院“百人计划”项目(2004407);;中国科学院重要方向性项目(KZCX3-SW-339);;国家自然科学基金项目(40701031);;国家自然科学基金创新群体项目“冻土与寒区工程”资助 |
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| 摘 要： | 黄河源区位于青藏高原多年冻土区东北部边缘地带,是季节冻土、岛状多年冻土和在大片连续多年冻土并存地带.多年冻土层在垂向分布上有衔接状和不衔接状两大类.不衔接状又可分为浅埋藏(8m)、深埋藏(8m)和双层多年冻土等形式.从20世纪80年代以来,源区气温以0.02℃.a-1增温率持续上升,人类经济活动日益增强,导致冻土呈区域性退化.多年冻土下界普遍升高50～80m,最大季节冻深平均减少了0.12m,浅层地下水温度上升0.5～0.7℃.冻土退化总体趋势是由大片状分布逐渐变为岛状、斑状分布,多年冻土层变薄,冻土面积缩小,融区范围扩大.部分多年冻土岛完全消失变为季节冻土.
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| 关 键 词： | 黄河源区 冻土分布 类型 退化 |
Features and Degradation of Frozen Ground in the Sources Area of the Yellow River, China |
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| JIN Hui-jun,WANG Shao-ling,L Lan-zhi,HE Rui-xia,CHANG Xiao-li,LUO Dong-liang.Features and Degradation of Frozen Ground in the Sources Area of the Yellow River, China[J].Journal of Glaciology and Geocryology,2010,32(1):10-17. |
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| Authors: | JIN Hui-jun WANG Shao-ling L Lan-zhi HE Rui-xia CHANG Xiao-li LUO Dong-liang |
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| Institution: | State Key Laboratory of Frozen Soil Engineering;Cold and Arid Regions Environmental and Engineering Research Institute;Chinese Academy of Sciences;Lanzhou Gansu 730000;China |
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| Abstract: | The Sources Area of the Yellow River (SAYR) is located in the transitional, mosaicked zones of seasonally frozen ground, and isolated patched permafrost, discontinuous and continuous permafrost on the northeastern Qinghai-Tibetan Plateau. Vertically, permafrost can be attached or detached from seasonal frost action, and the latter can be further divided into three types: shallowly-buried (≤8 m), deeply-buried (>8 m), and double-layered permafrost. Since the 1980s, air temperatures in the SAYR have been rising at an average rate of 0.02 ℃·a~(-1) and human economic activities have been ever increasing, resulting in a regional degradation of permafrost. The lower limit of permafrost has elevated by 50～80 m. The average maximum depth of frost penetration has declined by 12 cm in the areas of seasonally frozen ground. The temperatures of suprapermafrost water have increased by 0.5～0.7 ℃. The general trends of permafrost degradation include reduction in areal extent (from continuous or discontinuous permafrost to isolated patches of permafrost) and thickness, and expansion of taliks. Some permafrost patches have been converted to seasonally frozen ground. |
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| Keywords: | Sources Area of the Yellow River(SAYR) frozen ground ground temperature degradation |
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