【摘要】 基于乌鲁木齐河源1号冰川东支海拔4 130 m处的雪冰化学资料,探究了气温和降水与冰芯记录形成过程及其分辨率的关系,并通过建立温度参数的淋溶模型,探讨了夏季消融期雪坑离子浓度与正积温的关系。结果表明:乌鲁木齐河源1号冰川Mg²⁺离子以1年为分辨率形成冰芯记录,其浓度仅保存了初始值的30%。春季,化学离子浓度峰值受到离子来源和降水的影响而增大,这种增大趋势随着深度的增加明显弱化。淋溶模式显示,雪坑离子浓度是关于消融量与离子损失率的指数函数,随正积温的增大表现出指数衰减的规律。该模式基本能反映不同离子的淋溶过程。更多还原

【Abstract】 To explore the effect of elution process on ion concentrations in snow and then interpret the ice core records, it is necessary to figure out the complete process of ice core record forming through tracking the Mg²⁺ concentration peaks in snow-firn packs. For the case of Glacier No.1 in headwater of Urumqi River, it is concluded that the ice core record formed from Mg²⁺ ion with a resolution of one year, finally only 30% of the initial value can be preserved. In spring, ion concentration in whole snow-firn layer will increase because of frequent dust events and precipitation. A temperature index elution model is constructed to describe the relationship between positive cumulative air temperatures and ion concentrations in ablation season. This conclusion shows that ion concentration decays exponentially with positive air temperatures. This model could practically reflect the elution process.更多还原