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The Effect of Change in Glacierized Area on the Calculation of Mass Balance in the Glacier No.1at the Headwaters of rümqi River

WANG Guo-ya1,SHEN Yong-ping2(1.State Key Laboratory of Frozen Soils Engineering,Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences,Lanzhou Gansu 730000,China;2.Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Gansu 730000,China)  
Based on eight topographic maps of the Glacier No.1 at the headwaters of rümqi River(Glacier No.1 for short) in different periods and the data of mass balance,the change in glacierized area and its impact on the calculation of mass balance were studied.The results show that the area of Glacier No.1 has been retreating since 1962.Until August 2008,the east and west branches of the Glacier No.1 had retreated 208.2 m and 110.5 m,respectively,while the glacier shrank to 1.645 km2,i.e.,decreased by 0.305 km2 or 15.6% than that in 1962.The change in glacierized area is not only in the decrease of glacierized area owing to the glacier end retreating,but also in the re-distribution of glacierized area with altitude owing to the decline of surface elevation,namely,the surface morphology of glacier has also undergone a great change.When the glacierized area change does not take into account,the mass balance change may be overestimation.It is found that the maximum,minimum and average errors due to the effect of the change in the glacierized area on the calculation of mass balance is 4.5%,2% and 3.5%,respectively,during 1988/1989—2005/2006.In short,little change in the glacierized area or surface morphology results in little influence on the calculation of mass balance,on the contrary,larger influence.
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