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冰川冻土 ›› 1983, Vol. 5 ›› Issue (3): 59-70.

• 研究论文 • 上一篇    下一篇

天山博格达峰北坡现代冰川积累和消融特征及物质平衡的估算

张文敬, 谢自楚   

  1. 中国科学院兰州冰川冻土研究所
  • 出版日期:1984-11-25 发布日期:2012-04-26

Features of Accumulation and Ablation of Existing Glaciers on the Northern Slope of Bogda, Tian Shan and an Estimation of Their Mass Balance

Zhang Wenjing, Xie Zichu   

  1. Lanzhou Institute of Glaciology and Cryopedology, Academia Sinica
  • Online:1984-11-25 Published:2012-04-26

摘要: 1981年7月下旬至8月中旬,我们重点对博格达峰区北坡的四工河4号冰川(5 Y725D 4)、四工河5号冰川(5 Y725D 5)和古班博格达河10号冰川(5 Y812B10)进行了冰川消融、积累的短期观测。

Abstract: Solid precipitation in existing glacial area on northern slope of Bogda is absolutely dominant. About 77 percent of the annual precipitation is concentrated in months May-September, commensurable to the total accumulation amount. From the record of Tianchi from 1980 to 1981, precipitation in the glacier area is found to be more than 600 mm. Because of differences in solar radiation with slope facing, the source of water vapour and other factors, glacial accumulation is distinctly different according to slope facing. Data from snow pits do not perfectly show the regularity of the increase in net accumutation with the rise of elevation. The net accumulation amount (water equivalent) of glacier No.4 was 4.36×105 m3 during 1980-1981, and the mean depth of net accumulation (water equilalent) was 147.3 mm.According to mean annual temperature data for many years the period of glacial ablation in this region is from May to September, and the strongest from June to August, during which glacial ablation is closely correlated with temperature and elevation. Because a large part of precipitation is concentrated in ablation period and new snow has a stronger reflection rate, the strength of net ablation is influenced to a certain extent. During serveying, the net ablation amount (water equivalent) of Glacier No.4 was 4.127×105 m3 and the mean depth of net ablation is 139 mm, the net ablation gradient being 1.35 mm/m.The mass balance of glacier No.4 was negative during 1980-1981. The level of the mass balance was not high (only 600 mm). It is consistent with Laohuogou glacier, in Qi Lian Shan (641 mm) and with glacier No.l at the head of Urumqi river, Tian Shan (685 mm), but much less than Guxiang glacier, Pomi county Tibet (2678 mm).