摘要
甲烷水合物是地球表层（＜２ｋｍ）最重要的碳库，其ＣＨ４含量很可能超过１０１６ｋｇ。暴露大陆架的海侵加热及深部压力变化可能使海相沉积物中的甲烷水合物失稳分解；而冰帽生长，使其下的水合物稳定带扩展。水合物对地表扰动的敏感性、稳定和失稳时间尺度的不对称性和水合物巨大碳量表明，甲烷水合物可能在调节冰期、间冰期大气成分中扮演重要角色。北极沿海多年冻土变暖和甲烷释放可能早已开始，但目前和下一世纪的排放量可能不大。由于水合物赋存和水合物碳量估计的不确定性和制约水合物稳定性机制的复杂性，特别是表面变化在深处传播的长时间滞后和衰减，水合物中甲烷对目前全球气候变化有一定影响，但这种影响较小，至少在２１世纪不会有重要影响。
The international symposium on ground freezing and frost action in soils was hold in lulea university of technology, sweden, on 15～17 April, 1997. The proceedings include 82 papers dealing with ISSMFE work group reports, heat and mass transfer in freezing and thawing soils and rock, frost susceptibility and frost heave, mechanical properties of frozen, thawed and thawing soils and rock, environmental soil freezing, engineering design and case histories. In this paper attention was paid on progresses in the study of soil freezing and frost heaving,design and case histories. In this paper attention was paid on progresses in the study of soil freezing and frost heaving.
出处
《冰川冻土》
CSCD
北大核心
1997年第3期272-279,共8页
Journal of Glaciology and Geocryology
