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冰川冻土 ›› 1983, Vol. 5 ›› Issue (4): 1-7.

• 研究论文 •    下一篇

高海拔多年冻土分布的地带性数学模式之探讨

程国栋, 吴邦俊   

  1. 中国科学院兰州冰川冻土研究所
  • 收稿日期:1982-07-23 出版日期:1984-08-25 发布日期:2012-04-26

Approach to the Mathematical Model of Zonality of High-Altitude Permafrost

Cheng Guodong, Wu Bangjun   

  1. Lanzhou Institute of Glaciology and Cryopedology, Academia Sinica
  • Received:1982-07-23 Online:1984-08-25 Published:2012-04-26

摘要: 多年冻土南界以南一定高度以上出现的多年冻土为高海拔多年冻土。出现多年冻土的最低海拔高度值,即高海拔多年冻土的下界值是国民经济总体规划的必不可少的资料之一。该下界值可看作土中水在空间的相变线。它和其它重要的自然地理要素(树线、雪线、山地寒漠土界线等)一样,是自然环境的十分敏感的指示者[1]

Abstract: The changing trends of timberline, snow line, boundary line of mountain cold desert soil and permafrost lower limit with latitude are quite similar. By using the method of curve-fitting,the empirical relationship between lower limit of high-altitude permafrost(H) and latitude (φ) has been obtained.H = 3650 exp[-0.003(φ-25.37)2] + 1428. Tentatively applied, the results are satisfactory.This function has an extreme value and an inflection point, which is different from those mathematical models obtained before. As indicated by this function, starting from equator, the permafrost lower limit rises with increase of latitude, and reaches its extreme value of 5078 m a.s.l. at the latitude of 25°22’N, then it descends with increase of latitude; at the initial stage, the descending slope is steep, and reaches its maximum at the latitude of 38°N, then becomes gentle with increase of latitude. These features of the function are closely related to the features of mean latitudinal distribution of earth’s radiation budget.