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- W22122786 abstract "Abstract Hydrologie and hydrochemical measurements were conducted from May to September 1991 in the Dry Cirque catchment, a seasonally snow-covered alpine basin at the headwaters of the Urumqi River. Solute concentrations in streamwater were generally highest at the initiation of snowmelt and then declined through the melt season and into summer, then increased as the contribution of baseflow to stream discharge increased. The snowpack was sampled for chemical content during maximum snow accumulation in May 1992 to investigate the role of an ionic pulse and dissolution of aeolian particles to stream water chemistry. At the initiation of snowmelt, ionic concentrations in snow were generally higher by a factor of four close to the ground compared to the top of the snowpack, consistent with the release of solutes from the snowpack in the form of an ionic pulse. Maximum concentrations of HC0 3 and Ca 2+ in the snowpack were near 400 /neq l 1 and associated with visibly dirty ice lens, indicating that dissolution of aeolian particles in snow was a major source of these solutes. The release of solutes from the snowpack influenced stream chemistry during snowmelt runoff, with aeolian deposition and an ionic pulse potentially important sources of solutes in stream flow. INTRODUCTION In recent decades, much progress has been made in understanding the processes that determine the hydrochemistry and biogeochemistry of seasonally snow-covered alpine basins in North America (e.g. Williams et al, 1993) and Europe (Psenner, 1989). Relatively less knowledge has been obtained for central Asia (e.g. Xue & Schnoor, 1994). The chemical composition of precipitation in central Asia, especially in China," @default.
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- W22122786 date "1995-01-01" @default.
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- W22122786 title "Snow and water chemistry of a headwater alpine basin, Urumqi River, Tian Shan, China" @default.
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