摘要
青藏高原多年冻土区的大气降水、地表水、冻结层下深层泉水及多年冻土层中的各类地下冰中氚含量均低于北美洲马更些河谷地区。各类地下冰中氚含量有明显的差异性,可判断冻胀丘成因类型和补给水来源及地下冰的相对生成年代和地下水类型。
Tritium is a kind of isotope of hydrogen. It is a ideal tracer element in natural water circulation. The tritium analysis come into use not only in glacier snow and precipitation but also in ground ice in permafrost regions. A lot of tritium analyses showed that the tritium concentrations of precipitation (fresh snow), surface water (river or lake), groundwater deeply under frozen layer, and many kinds of ground ices in permafrost regions of Qinghai-Xizang plateau are all lower than those in the Mackenzie River valley area of Nourth America. Because the tritium concentrations are different in different water, various ground ices differ each other greatly in the tritium concentrations. We can use these differences to judge what the main reason to form a pingo is, where there the complement water came from, and when the ice formed relatively. Tritium analysis is also a new method in studying the water moving or migrating cryogenic structure and cryogenic phenomena in permafrost regions.
出处
《冰川冻土》
CSCD
北大核心
1989年第1期53-59,共7页
Journal of Glaciology and Geocryology
