| Brief Communication |
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| The transport of chemical components in homogeneous snowpacks on Urumqi Glacier No. 1, eastern Tianshan Mountains, Central Asia |
| YOU Xiaoni1,2, LI Zhongqin1, Ross EDWARDS3, WANG Lixia2 |
1 Key Laboratory of Cryosphere and Environment/Tianshan Glaciological Station/Laboratory of Ice Core and Cold Regions Environment, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2 Tianshui Normal University, Tianshui 741001, China;
3 Imaging and Applied Physics, Curtin University of Technology, Bentley WA 6102, Australia |
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Abstract Chemical records from alpine ice cores provide an invaluable source of paleoclimatic and environ-mental information. Not only the atmospheric chemical composition but also depositional and post-depositional processes are recorded within snow/firn strata. To interpret the environmental and climatic significance of ice core records, we studied the variability of glacier snowpack chemistry by investigating homogeneous snowpacks from October 2003 to September 2006 on Urumqi Glacier No. 1 in eastern Tianshan Mountains, Central Asia. Principle Component Analysis of ionic species in dry and wet seasons revealed the impact of meltwater in redistributing ions in the snowpacks. The 1st, 2nd and 3rd principle components for dry seasons differ significantly, reflecting complex associations between depositional or/and post-depositional processes. The variability trend of ionic concentrations during the wet seasons was found to fit a Gauss Function with significant parameters. The elution factor revealed that more than half of ions are leached out during the wet seasons. Differences with respect to ion snowpack mo-bility were found. Of the ions studied SO42– was the most mobile and Mg2+ the least mobile. A threshold relationship between air temperatures and the elution process was investigated over the study period. The results indicate that the strong melt /ablation processes and iconic redistribution occur at a threshold air temperature of 0°C. The study found that surface melt on the snowpacks is the main factor causing the alteration of the snowpack chemistry. Rainfall also has an impact on the chemistry but plays a less significant role than the surface melt.
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Received: 29 September 2014
Published: 05 October 2015
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| Fund: National Natural Science Foundation of China (41261017). |
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Corresponding Authors:
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| Aizen E M, Aizen V B, Melack J M, et al. 2001. Precipitation and atmospheric circulation patterns at mid-latitudes of Asia. Interna-tional Journal of Climatology, 21(5): 535–556.Bales R C, Davis R E, Stanley D A. 1989. Ion elution through shallow homogeneous snow. Water Resources Research, 25(8): 1869–1877.Bernhardt M, Schulz K, Liston G E, et al. 2012. The influence of lateral snow redistribution processes on snow melt and sublimation in al-pine regions. Journal of Hydrology, 424: 196–206.Brimblecombe P. 1985. Relocation and preferential elution of acidic solute through the snowpack of a small, remote, high-altitude Scot-tish catchment. Annals of Glaciology, 7: 141–147.Brimblecombe P, Clegg S L, Davies T D, et al. 1987. Observations of the preferential loss of major ions from melting snow and laboratory ice. Water Research, 21(10): 1279–1286.Davis R E. 1991. Links between snowpack chemistry and snowpacks physics. In: Processes of Chemical Change in Snowpacks. Berlin: Springer Berlin Heidelberg, 115–138.Eichler A, Schwikowski M, Gäggeler H W. 2001. Meltwater-induced relocation of chemical species in Alpine firn. Tellus, 53B: 192–203.Gao Y, Arimoto R, Zhou M Y, et al. 1992. Relationships between the dust concentrations over eastern Asia and the remote North Pacific. Journal of Geophysical Research, 97(D9): 9867–9872.Ginot P, Kull C, Schwikowski M. 2001. Effects of post-depositional processes on snow composition of a subtropical glacier (Cerrado Tapado, Chilean Andes). Journal of Geophysical Research, 106(23): 32375–32386.Goto-Azuma K, Nakawo M, Han J. 1994. Melt-induced relocation of ions in glaciers and in a seasonal snowpack. IAHS Publication, 223(4): 287–297.Harrington R, Bales R C, Wagnon P. 1996. Variability of meltwater and solute fluxes from homogenous melting snow at the laboratory scale. Hydrological Processes, 10: 945–953.Harrington R, Bales R C. 1998. Modeling ionic solute transport in melting snow. Water Resource Research, 34(7): 1727– 1736.Hewitt A D, Cragin J H, Colbeck S C. 1989. Does snow have ion chromatographic properties? In: Proceedings of the 46th Annual Eastern Snow Conference. Quebec: 165–171.Hou S G, Qin D H. 2002. The effect of postdepositional process on the chemical profiles of snow pits in the percolation zone. Cold Regions Science and Technology, 34(2): 111–116.Iizuka Y, Igarashi M, Kamiyama K, et al. 2002. Ratios of Mg2+/Na+ in snowpack and an ice core at Austfonna ice cap, Svalbard, as an in-dicator of seasonal melting. Journal of Glaciology, 48(162): 452–460.Johannessen M, Henriksen A. 1978. Chemistry of snow meltwater: changes in concentration during melting. Water Resources Research, 14(4): 615–619.Lee J, Nez V E, Feng X H, et al. 2008a. A study of solute redistribution and transport in seasonal snowpack using natural and artificial trac-ers. Journal of Hydrology, 357(3): 243–254.Lee J, Feng X H, Posmentier E S, et al. 2008b. Modeling of solute transport in snow using conservative tracers and artificial rain-on-snow experiments. Water Resources Research, 44(2): 1–12.Li X Y, Li Z Q, Ding Y J, et al. 2007. Seasonal variations of pH and electrical conductivity in a snow-firn pack on Glacier No. 1, eastern Tianshan, China. Cold Regions Science and Technology, 48(1): 55–63.Li Z Q, Han T D, Jin Z F, et al. 2003. A summary of 40-year observed variation facts of climate and Glacier No. 1 at headwater of Urumqi River, Tianshan, China. Journal of Glaciology and Geocryology, 25(2): 117–121. (in Chinese)Li Z Q, Edwards R, Mosley-Thompson E, et al. 2006. Seasonal vari-ability of ionic concentrations in surface snow and elution processes in snow-firn packs at the PGPI site on Urumqi glacier No. 1, eastern Tien Shan, China. Annals of Glaciology, 43(1): 250–256.Luo H Z. 1983. Hydro chemical features of the Glacier No.1 in the source region of Urumqi River, Tianshan. Journal of Glaciology and Geocryology, 5(2): 55–64. (in Chinese)Meyer T, Wania F. 2011. Modeling the elution of organic chemicals from a melting homogeneous snow pack. Water Research, 45(12): 3627–3637.Moore J C, Grinsted A, Kekonen T, et al. 2005. Separation of melting and environmental signals in an ice core with seasonal melt. Geo-physical Research Letters, 32(10), doi: 10.1029/2005GL023039.Moore J C, Grinsted A. 2009. Ion fractionation and percolation in ice cores with seasonal melting. Low Temperature Science, 68: 287–298.Schotterer U, Ginot W S P. 2004. The influence of post-depositional effects on ice core studies: examples from the Alps, Andes, and Altai. Developments in Paleoenvironmental Research, 9: 39–59.Sigg A, Neftel A. 1991. Evidence for a 50 percent increase in H2O2 over the past 200 years from a Greenland ice core. Nature, 351: 557–559.Tsiouris T, Vincent C E, Davies T D, et al. 1985. The elution of ions through field and laboratory snowpacks. Annals of Glaciology, 7(21): 501–507. Tranter M. 1991.Controls on the composition of snowmelt. Seasonal Snowpacks (NATO ASI Series), 28: 241–271.Tranter M, Tsiouris S, Davies T D, et al. 1992. A laboratory investiga-tion of the leaching of solute from snowpack by rainfall. Hydro-logical Processes, 6(2): 169–178.Wagnon P, Delmas R J, Legrand M. 1999. Loss of volatile acid species from upper firn layers at Vostok, Antarctica. Journal of Geophysical Research, 104(D3): 3423–3431. Wake C P, Mayewski P A, Li Z Q, et al. 1994. Modern eolian dust deposition in Central Asia. Tellus, 46B(3): 220–233.Wang D, Zhang P. 1985. On the valley climate of Urumqi River in the Tianshan Mountains. Journal of Glaciology and Geocryology, 7(3): 239–248. (in Chinese)Wang F T, Li Z Q, You X N, et al. 2006. Seasonal evolution of aerosol stratigraphy in Urumqi glacier No. 1 percolation zone, eastern Tien Shan, China. Annals of Glaciology, 43: 245–249.Williams M W, Tonnessen K A, Melack J M, et al. 1991. Sources and spatial variation of the chemical composition of snow in the Tien Shan, China. Annals of Glaciology, 16: 25–32.Wolff E W, Hall J S, Mulvaney R, et al. 1998. Relationship between chemistry of air, fresh snow and firn cores for aerosol species in coastal Antarctica. Journal of Geophysical Research, 103(D9): 11057–11070.You X N, Li Z Q, Wang F T. 2005. Study on time scale of snow-ice transformation through snow layer tracing method—take Glacier No.1 at the headwaters of Urumqi River as an example. Journal of Glaciology and Geocryology, 27(6): 853–860. (in Chinese)You X N, Dong Z W. 2011. Deposition process of dust microparticles from aerosol to snow-firn pack on Glacier No. 1 in eastern Tianshan Mountains, China. Journal of Earth Science, 22(4): 460–469.You X N, Li Z Q. 2012. Study on deposition characteristics of insoluble microparticles and Mg2+ concentration in snow cover and their cor-relation. Arid Zone Research, 29(1): 143–147. (in Chinese)Zhao Z P, Li Z Q. 2004. Determination of soluble ions in atmospheric aerosol by ion chromatography. Modern Scientific Instruments, (5): 46–49. (in Chinese)Zhao Z P, Li Z Q, Edwards R, et al. 2006. Atmosphere-to-snow-to-fsfirn transfer of NO3– on Glacier No.1, eastern Tianshan, China. Annals of Glaciology, 43(1): 239–244. |
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