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大小兴安岭多年冻土退化及其趋势初步评估

Degradation of Permafrost in the Da and Xiao Hinggan Mountains,Northeast China,and Preliminary Assessment of Its Trend

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【作者】 金会军于少鹏吕兰芝郭东信李英武

【Author】 JIN Hui-jun~1, YU Shao-peng~1,2, GUO Dong-xin~1, L Lan-zhi~1, LI Ying-wu~1,3(1.State Key Laboratory of Frozen Soils Engineering,CAREERI,CAS,Lanzhou Gansu 730000,China;2.Department of Geography,Harbin Institute,Harbin Heilongjiang 150001,China; 3.Yitulihe Office,Qiqihar Branch of the Harbin Railway Department,Yakeshi Inner Mongolia 022168,China)

【机构】 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甘肃兰州730000哈尔滨学院地理系黑龙江哈尔滨150001哈尔滨铁路局齐齐哈尔铁路分局伊图里河办事处内蒙古牙克石022168

【摘要】 大小兴安岭多年冻土处于欧亚大陆多年冻土带南缘,地温高、厚度小、热稳定性差、对气候变暖的敏感性强.过去40 a来该区多年冻土退化主要表现为最大季节融化深度增大,厚度减薄,地温升高,融区扩大,多年冻土岛消失等.气候变暖及该区森林植被的锐减是导致多年冻土退化的普遍性和基础性因素,而多种人为活动影响起了加速促进作用.依据多年冻土南界与多年平均气温的密切相关关系,据1991—2000年平均气温-1.0~1.0℃等值线给出了现今多年冻土南界位置,并探讨了未来40~50 a后气温升高1.0~1.5℃情况下多年冻土南界的可能北移情况.

【Abstract】 In the southern margin of permafrost zone of the Eurasian continent,permafrost in the Da and Xiao Hinggan Mountains is warm,thin,thermally unstable and subsequently sensitive to climatic warming.During the past 40 years,permafrost has been degrading as evidenced by deepening active layer,thinning of permafrost,rising ground temperatures,expansion of taliks,and disappearance of permafrost islands.Detailed analyses indicate that climatic warming and sharp reduction of forest coverage during the past century are the general and basic reasons for the degradation of permafrost,and increasing human activities have been accelerating the retreat of permafrost.Based on the close correlations between the southern limit of permafrost(SLP) and decadal average air temperatures,present positions of the SLP are delineated using the multi-year average air temperature isotherms of-1.0~1.0 ℃ during 1999-2000.The SLP would shift northwards upon a projected warming of 1.0~1.5 ℃ during the next 40~50 years,but with significant uneven variations in different parts.

【基金】 中国科学院百人计划项目”气候变化条件下温暖多年冻土区线性工程稳定性”(2004407)资助
  • 【文献出处】 冰川冻土 ,Journal of Glaciology and Geocryology , 编辑部邮箱 ,2006年04期
  • 【分类号】P642.14
  • 【被引频次】95
  • 【下载频次】821
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