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• 冰冻圈变化 •    下一篇

极海洋型冰川是什么冰川

李吉均,周尚哲   

  1. 1.兰州大学
    2.
    南京师范大学
    3.华南师范大学
  • 收稿日期:2017-12-05 修回日期:2018-01-11 出版日期:2018-03-05
  • 通讯作者: 周尚哲

What glacier is the “ultra-maritime glacier”? A discussion with Professor Jing Cairui

    

  1.  
  • Received:2017-12-05 Revised:2018-01-11 Online:2018-03-05

摘要:

施雅风和谢自楚曾将中国现代冰川分为极大陆型冰川、亚大陆型冰川和海洋型冰川。这个分类方案因符合中国现代冰川的基本特征而得到广泛承认与应用。近年,景才瑞提出极海洋型冰川的概念,示意第四纪冰期时中国东部中低山地既然不存在基本的冰川类型,则可能存在一种比海洋型冰川更加高温湿润的特殊冰川。本文认为,这样类型的冰川是不存在的。海洋型冰川已经涵盖了处于融点冰温的临界冰川,即使再多的降水,也不能在正温条件下演变成冰川。故极海洋型冰川的概念是不能成立的。第四纪环境研究表明,冰期时大陆架广泛出露,西伯利亚-蒙古高压强迫下的冬季风加强,中国东部气候是朝着更加干旱的方向变化的,其海洋型特征也要大大降低。

Abstract:

Shi Yafeng and Xie Zichu have classified the contemporary glaciers of China into ultra-continental glacier, sub-continental glacier and maritime glacier. This classification has been widely accepted and applied because it accords with the essential characteristics of Chinese glaciers. Recently, Professor Jing Cairui proposes a new term, “ultra-maritime glacier”, to support the hypothesis of glaciations of the East China, meaning that even if the regular glaciers were not present on the middle-lower mountains in East China during Quaternary, there would existed a special kind of glaciers that were more warm and more humid than maritime glaciers. It is difficult to think such glacier is present in the world, because the term “maritime glaciers” contains all the glaciers with 0 temperate ice and it is impossible for water to crystallize into glacial ice under the temperature higher than 0 even more precipitation. So the concept “ultra-maritime glacier” is invalid. In addition, a lot of studies on Quaternary environment have indicated that in ice ages, continental shelf exposed extensively, the winter monsoon was dominant forced by the intensified Siberia-Mongolia high pressure. So the climate shifted to drier and the maritime climate was weakened during ice ages in the East China.

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