Skip to main content Accessibility help
×
Home

Changes in chemical and isotopic properties near infiltrated cracks in an ice core from Ürümqi glacier No. 1, Tien Shan, China

  • Lee Xinqing (a1) (a2), Qin Dahe (a2), Hou Shugui (a2), Ren Jiawen (a2), Duan Keqin (a1) and Zhou Hui (a1) (a2)...

Abstract

Ice cores recovered for paleoclimatic and/or paleoenvironmental reconstructions in the Tien Shan and Qinghai–Tibetan Plateau often encounter cracks. Although we expect that cracks opened to surface meltwater will inevitably change ice-core records, we do not know how and to what extent records are influenced. An ice core retrieved from glacier No. 1 at Ürümqi river head, Tien Shan, China, exhibits a crack nearly 2.5 m long that has admitted meltwater, forming secondary ice within the fracture. A small inclusion of the infiltrated ice in sampling is shown to reduce δ18O by an extent of Holocene vs Last Glacial Maximum while enhancing significantly the pH, conductivity and the following ionic species: CH3COO, and CO(COO)2 2–. of the parameters increased, and HCOO are the most affected, being enhanced nearly six-fold in the fractured section compared to the non-fractured sections, followed by CO(COO)2 2– and electrical conductivity measurement (ECM). Despite the alteration, primary fluctuations of some parameters are still recognizable. This suggests that if the infiltrated ice can be avoided in the sampling operation, ice cores with cracks may still provide authentic records. This shows the need to pay close attention to physical characteristics of ice cores in order to identify such secondary ice.

  • View HTML
    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      Changes in chemical and isotopic properties near infiltrated cracks in an ice core from Ürümqi glacier No. 1, Tien Shan, China
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      Changes in chemical and isotopic properties near infiltrated cracks in an ice core from Ürümqi glacier No. 1, Tien Shan, China
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      Changes in chemical and isotopic properties near infiltrated cracks in an ice core from Ürümqi glacier No. 1, Tien Shan, China
      Available formats
      ×

Copyright

References

Hide All
Alley, R.B. and Fitzpatrick., J.J. 1999. Conditions for bubble elongation in cold ice-sheet ice. J. Glaciol., 45(149), 147153.
Arnason, B. 1969. The exchange of hydrogen isotopes between ice and water in temperate glaciers. Earth Planet. Sci. Lett., 6(6), 423430.
Cuffey, K.M. andSteig., E.J. 1998. Isotopic diffusion in polar firn: implications for interpretation of seasonal climate parameters in ice-core records, with emphasis on central Greenland. J. Glaciol., 44(147), 273284.
De Angelis, M. andLegrand, M.. 1994. Origins and variations of fluoride in Greenland precipitation. J. Geophys. Res. , 99(D1),11571172.
De Angelis, M. and Legrand, M.. 1995. Preliminary investigations of post depositional effects of HCl, HNO3, and organic acids in polar firn layers. In Delmas, R.J., ed. Ice core studies of global biogeochemical cycles. Berlin, etc., Springer-Verlag, 361381. (NATO ASI Series I: Global Environmental Change 30.)
Gjessing, Y., Hanssen-Bauer, I., Fujii, Y., Kameda, T., Kamiyama, K. andKawamura, T.. 1993. Chemical fractionation in sea ice and glacier ice. Bull. Glacier Res. 11,18.
Goto-Azuma, K., Enomoto, H., Takahashi, S., Kobayashi, S.,Kameda, T. and Watanabe, O.. 1993. Leaching of ions from the surface of glaciers in western Svalbard. Bull. Glacier Res. 11, 3950.
GRIP Project Members. 1993. Climate instability during the last interglacial period recorded in the GRIP ice-core. Nature, 364(6434), 203207.
Shugui, Hou, Dahe, Qin Zhongqin, Li and Cuilan, Huang 1998. [Present environmental processes of ice core δ18O records from the No. 1 glacier at the headwaters of Ürümqi River, Xinjiang, China.. [Geochimica.], 27(2), 108116. [In Chinese.]
Shugui, Hou, Dahe, Qin, Jiawen, Ren and Wenkun, Sheng. 1999. [The present environmental processes of the pH and conductivity records in the Glacier No. 1at the headwaters of Ürümqi River, Tien Shan mountains.. J. Glaciol. Geocryol., 21(3), 225232. [In Chinese with English abstract.]
Johannessen, M. and Henriksen, A.. 1978. Chemistry of snow meltwater: changes in concentration during melting. Water Res. Res., 14(4), 615619.
Ersi, Kang. 1991. [A preliminary study on the drainage system in the ablation area of the Glacier No. 1 at the source of Ürümqi River.. J. Glaciol. Geocryol., 13(3), 219228. [In Chinese with English abstract.]
Koerner, R.M. 1997. Some comments on climatic reconstructions from ice cores drilled in areas of high melt. J. Glaciol., 43(143), 9097. (Erratum: 43(144), p. 375–376.).
Xinqing, Lee, Dahe, Qin, Jiawen, Ren, Keqin, Duan, Shichang, Kang and Hui, Zhou. 2002. Past 43 year oxalate record: Ürümqi glacier No.1,Tien Shan, China, and its link with Far East Rongbuk Glacier, Qomolangma (Mount Everest). Ann. Glaciol ., 35 (see paper in this volume).
Legrand, M., de Angelis, M. and Maupetit, F.. 1993. Field investigation of major and minor ions along Summit (central Greenland) ice cores by ion chromatography. J. Chromatogr. , 640(1–2), 251258.
Chaohai, Liu and 8 others. 1991. [Handbook of Tien Shan glaciological station.] Lanzhou, Gansu Science and Technology Press. [In Chinese.]
Fengjing, Liu , Williams, M., Cheng Guodong, Zhu, S., Wang Chunzu and Han Tianding. 1999. [Hydrochemical process of snowmelt and stream water in Ürümqi river, Tien Shan mountains.. J. Glaciol. Geocryol., 21(3), 213219. [In Chinese with English abstract.]
Lorius, C. and 6 others. 1985. A 150,000-year climatic record from Antarctic ice. Nature, 316(6029), 591596.
Mayewski, P.A. and Legrand, M.. 1990. Recent increase in nitrate concentration of Antarctic snow. Nature, 346(6281), 258260.
Nye, J.F. 1998. Diffusion of isotopes in the annual layers of ice sheets. J. Glaciol., 44(148), 467468.
Sigg, A., Staffelbach, T. and Neftel, A.. 1992. Gas phase measurements of hydrogenperoxide in Greenland and their meaning for the interpretation of H2O2 records in ice cores. J. Atmos. Chem., 14(1–4), 223232.
Staffelbach, T., Neftel, A., Stauffer, B. and Jacob, D.. 1991. A record of the atmospheric methane sink from formaldehyde in polar ice cores. Nature, 349(6310), 603–605.
Dehui, Wang and Peiyuan, Zhang. 1985. [On the valley climate of Ürümqi River in theTien Shanmountains.] J. Glaciol. Geocryol. ,7(3), 239248.[In Chinese with English summary.]
Zichu, Xie and Maohuan, Huang. 1989. [The transformation of snow to ice in glaciers of China.] In Yafeng, Shi, ed. [An introduction to the glaciers in China]. Beijing, Science Press, 5568. [In Chinese.]
Daqing, Yang Ersi, Kang and Blumer, F.. 1992. [Characteristics of precipitation in the source area of the Ürümqi River Basin.. J. Glaciol. Geocryol., 14(3), 258266. [In Chinese with English summary.]
Xiangsong, Zhang,Guocai, Zhu,Songlin, Qian, Jiyang, Chen and Ying., Shen 1985. [Radar measuring ice thickness of No. 1 Glacier at the source of Ürümqi River, Tien Shan.] J. Glaciol. Geocryol., 7(2), 153162. [In Chinese with English summary.]

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed