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Sciences in Cold and Arid Regions ›› 2022, Vol. 14 ›› Issue (2): 91–99.doi: 10.3724/SP.J.1226.2022.2020-210077.

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  • 收稿日期:2020-08-06 接受日期:2021-02-08 出版日期:2022-04-30 发布日期:2022-04-25

Influence of meteorological elements on chemical evolution of snow and ice of Urumqi Glacier No. 1, eastern Tianshan Mountains

XiaoNi You1(),ZhongQin Li2,LiXia Wang1   

  1. 1.Tianshui Normal University, Tianshui, Gansu 741001, China
    2.State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Science, Lanzhou, Gansu 730000, China
  • Received:2020-08-06 Accepted:2021-02-08 Online:2022-04-30 Published:2022-04-25
  • Contact: XiaoNi You E-mail:yxiaoni@tsnu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(41761017);the Natural Science Foundation of Gansu Province(18JR3RE247)

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Abstract:

For most mountain glaciers, chemical components in snowfall are subject to the elution process under the influences of meltwater before they are preserved in ice, creating difficulties for interpreting ice core records. To understand the formation process of ice core records and analyze the influences of meteorological factors on the ice core resolution, we measured ion concentrations of snowpacks from 2003 to 2006 in the PGPI (Program for Glacier Processes Investigation) site of Urumqi Glacier No. 1. The ion concentration variation in snowpack exhibits apparent seasonality. In summer, the higher snowmelt rates due to air temperature rise intensify dilution and lead to an exponential decrease in ion concentrations as the accumulated positive temperature increases. In winter, the snow ion concentrations are stable and low as a result of reduced temperature and rare precipitation. Many ions from summer precipitation are leached out by meltwater, and only the precipitation that occurs at the end of the wet season can be preserved. Through tracking the evolution of magnesium ion peaks in the snowpack, it is concluded that the ice core resolution is one year on Urumqi Glacier No. 1, albeit 70% of the concentration information is lost.

Key words: elution process, Urumqi Glacier No. 1, temperature, precipitation, ice core resolution

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StageAverage total ion concentration in snowpack (μg/L)Start dateEnd datePrecipitation (mm)
T12,759.1beginning of Marchmiddle of June108.7
T21,305.5middle of Junebeginning of Sepetember520.5
T31,990.6beginning of Septemberbeginning of December99.1
T41,768.1beginning of Decemberbeginning of March15.7

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