中南阿拉斯加冰川成因及冻土分布特征分析

Analysis of the precipitation patterns in Southcentral Alaska

冰川及冻土地貌是地貌研究的重要组成部分,通过研究阿拉斯加中南部的冰川成因及冻土分布特征有助于进一步了解中南阿拉斯加的地貌特征。在梳理影响冰川成因的多种因素以及永久冻土相关知识的前提下,对阿拉斯加中南部地区的冰川成因以及冻土分布特征进行了分析。指出:(1)大冰期被认为主要是由于大陆位置的变动而引起的,冰川形成于冬天冷到可以降雪而夏天不能暖到将所有积雪都融化掉的地方;(2)在中南阿拉斯加,山区之外的一些地方只存在不连续的永冻土。这些能够发育不连续永冻土的地方主要位于科珀河(铜河)流域,以及苏西特纳河流域北部的某些地区。

Glacier and permafrost landscape is an important part of landscape research.It helps to understand the terrain characteristics in Southcentral Alaska through the study of the glacial origin and distribution of permafrost.This paper analyzes the glacial origin and distribution of permafrost in Southcentral Alaska on the basis of combing a variety of factors affect glaciers origin and permafrost under the premise of knowledge.It points out：（1）It is considered that great ice age is mainly caused by the change of the continental position.Glaciers formed in cold enough to snow in the winter and the snow can＇t be melt in the summer;（2）In Southcentral Alaska,other places outside the mountains only exist discontinuous permafrost.These places are mainly located in copper river basin and some places in the northern part of Suzy Turner River Basin.