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Glacier meltwater runoff process analysis using δD and δ^(18)O isotope and chemistry at the remote Laohugou glacier basin in western Qilian Mountains, China

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Journal of Geographical Sciences 2016年第6期26卷 722-734页

作者：王彩霞董志文秦翔张杰杜文涛吴锦奎 College of Geography and Environmental Science Northwest Normal University State Key Laboratory of Cryospheric Sciences CAS Qilian Mountain Glacier and Ecological Environment Research Station Cold and Arid Regions Environmental and Engineering Research Institute CAS

Stable hydrogen and oxygen isotope has important implication on water and mois- ture transportation tracing research. Based on stable hydrogen （6D） and oxygen （6180） isotope using a Picarro Ll102-i and water chemistry （e.g. major ions, pH, EC and TDS） meas- urement, this study discussed the temporal variation and characteristics of stable hydrogen and oxygen isotope, chemistry （e.g. TDS, pH, EC, Ca^2^, Mg2＋, Na^＋ and CI） in various water bodies including glacier meltwater runoff, ice and snow, and precipitation at the Laohugou g^acier basin during June 2012 to September 2013. Results showed that 6D and δ18O in the meltwater runoff varied obviously with the temporal change from June to September, showing firstly increasing trend and then decreasing trend, with the highest values in July with high air temperature and strong glacier melting, which could indicate the temporal change of glacier melting process and extent. Variations of 6D and δ18O in the runoff were similar with that of snow and ice on the glacier, and the values were also above the GMWL, which probably im- plied that the glacier runoff was mainly originated from glacier melting and precipitation supply The glacier meltwater chemical type at the Laohugou glacier basin were mainly composed by Ca-Na-HCO3-SO4 and Ca-Mg-HCO3-SO4, which also varied evidently with the glacier melting process in summer. By analyzing the temporal change of stable hydrogen and oxygen isotope and chemistry in the melting period, we find it is easy to separate the components of the snow and ice, atmospheric precipitation and melt-runoff in the river, which could reflect the change process of glacier melting during the melting period, and thus this work can contribute to the glacier runoff change study of large-scale region by stable isotope and geochemical method in future.

关键词： meltwater runoff stable hydrogen and oxygen isotope chemistry runoff process

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Impact of climate change on the streamflow in the glacierized Chu River Basin, Central Asia

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Journal of Arid Land 2015年第4期7卷 501-513页

作者： MA Changkun SUN Lin LIU Shiyin SHAO Ming'an LUO Yi College of Natural Resources and Environment Northwest A&F University Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of Sciences State Key Laboratory of Cryospheric Sciences Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences

Catchments dominated by meltwater runoff are sensitive to climate change as changes in precipitation and temperature inevitably affect the characteristics of glaciermelt/snowmelt, hydrologic circle and water resources. This study simulated the impact of climate change on the runoff generation and streamflow of Chu River Basin （CRB）, a glacierized basin in Central Asia using the enhanced Soil and Water Assessment Tool （SWAT）. The model was calibrated and validated using the measured monthly streamflow data from three discharge gauge stations in CRB for the period 1961-1985 and was subsequently driven by downscaled future climate projections of five Global Circulation Models （GCMs） in Coupled Model Inter-comparison Project Phase 5 （CMIP5） under three radiative forcing scenarios （RCP2.6, RCP4.5 and RCP8.5）. In this study, the period 1966-1995 was used as the baseline period, while 2016-2045 and 2066-2095 as the near-future and far-future period, respectively. As projected, the climate would become warmer and drier under all scenarios in the future, and the future climate would be characterized by larger seasonal and annual variations under higher RCP. A general decreasing trend was identi- fied in the average annual runoff in glacier （-26.6% to -1.0%）, snow （-21.4% to ＋1.1%） and streamflow （-27.7% to -6.6%） for most of the future scenario periods. The projected maximum streamflow in each of the two future scenarios occurred one month earlier than that in the baseline period because of the reduced streamflow in summer months. Results of this study are expected to arouse the serious concern about water resource availability in the headwater region of CRB under the continuously warming climate. Changes in simulated hydrologic outputs underscored the significance of lowering the uncertainties in temperature and precipitation projection.

关键词： glacier snow meltwater runoff climate change hydrologic modeling

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Preliminary Results on Hydrological and Hydrochemical Features of Kartamak Glacier Area in Mt. Muztag Ata

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Journal of Mountain Science 2007年第1期4卷 77-85页

作者： ZHAO Huabiao YAO Tandong XU Baiqing Key Laboratory of Cryosphere and Environment CAREERI CAS Lanzhou Gansu 730000 China Institute of Tibetan Plateau Research CAS Bering 100085 China Key Laboratory of Oryosphere and Environment CAREERI CAS Lanzhou Gansu 730000 China

The variations of the meltwater runoff draining from Kartamak Glacier in Mt. Muztag Ata in China were studied by using the measured hydrological data from 1 June to 25 August 2003. The meltwater runoff is mainly affected by ambient temperature and precipitation. meltwater and precipitation samples were collected from 10 to 23 August 2003. Their pH, EC (electric conductivity) and the major ions (Na^+, K^+, Ca^(2+), Mg^(2+), Cl^-, NO_3^-, SO_~4^(2-)) were determined. pH values showed a positive correlation with EC values for all samples. meltwater samples were slightly alkaline. Sulfate and calcium were the dominant anion and cation in the measured ions, respectively. All the ion concentrations had inverse relationships with runoff or water level. In order to discuss the origins of dissolved chemical substances in the glacial meltwater, a principal component analysis was carried out. The results showed that water-rock interaction determined the ion components of the meltwater.

关键词： Muztag Ata Kartamak Glacier meltwater runoff Hydrochemical characteristics

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