Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《JOURNAL OF GLACIOLGY AND GEOCRYOLOGY》 1999-03
Add to Favorite Get Latest Update

The Present Environmental Processes of the pH and Conductivity Records in the Glacier No 1 at the Headwaters of Urumqi River, Tianshan Mountains

HOU Shu gui, QIN Da he, REN Jia wen, SHENG Wen kun (Laboratory of Ice Core and Cold Regions Environment, LIGG, CAS, Lanzhou Gansu 730000, China  
Analyses of pH and conductivity in precipitation samples collected from June 1995 to June 1996, in snow pit samples collected during the winter of 1995~1996 and during the summer of 1996, and in shallow ice core samples retrieved in May 1996 from the headwaters of the Urümqi River are presented in this paper The pH values of the precipitation samples were in the range of 5 7~7 9, most of which were close to neutrality The conductivity values of the precipitation samples were in the range of 3 0~292 μS/cm, among which over half of the samples were below 30 μS/cm The low pH values appeared mostly in summer and autumn, while the seasonal variation of the conductivity was not apparent The relationship between pH and conductivity was more complicated at the headwaters of the Urümqi River than that in the other remote places: a negative relationship existed between pH and conductivity on the condition of 5 7pH6 3, which was similar to that in polar snow and ice Nevertheless, a positive relationship existed between them on the condition of 6 3pH7 9 Though much difference in the pH and conductivity values of the winter snow pits existed at 4 030 m and at 3 900 m a s l owing to the snow re distribution caused by snow drifting, a significant positive relationship still preserved between the pH and conductivity values, which demonstrated that the pH and conductivity values of the winter snowpacks was controlled mainly by the alkaline dust The dissolution of the alkaline dust in meltwater of the summer snowpacks might increase the pH and conductivity values of the summer snow pit samples However, a significant positive relationship still existed between the pH and conductivity values of the summer snow pits Such relationship was also preserved in the ice core pH and conductivity records This fact implies that the post depositional processes do not shift the relationship between the pH and conductivity values, which validates the application of the ice core pH and conductivity records from the zones with seriously melting for paleoclimate reconstruction
【Fund】: 国家自然科学基金;中国科学院 “九五”重大项目 ;攀登计划项目;中国科学院天山冰川观测试验站基金
【CateGory Index】: P343.6
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved