摘要
冰川积累区雪-冰界面附近的化学物质迁移对冰芯记录的形成具有重要意义,为讨论主要含氮离子在这一界面的迁移,本研究基于2004年11月至2006年3月在天山乌鲁木齐河源1号冰川连续采集的64组雪冰样品分析了NO3-与NH4+的变化情况。结果表明,雪层底部干季(11月至翌年3月)含氮离子浓度的平均值高于湿季(4—10月)的,而冰层顶部离子浓度的平均值则相反,即干季的低于湿季的,雪-冰界面附近5cm与15cm尺度上均有体现;干季的离子浓度雪冰比(雪层底部与冰层顶部含氮离子浓度的比值)平均值大于湿季的,即干季雪层底部含氮离子的浓度一般高于冰层顶部的浓度,湿季其表现出相反的趋势;雪-冰界面附近含氮离子的迁移反映了环境信息的记录过程,受到融水和气温变化等因素的综合影响。
In order to investigate the nitrogen-bearing ion transportation at the firn-ice interface in the accumulation zone of glacier,the authors collected 64 sets of firn and ice samples at the Urumqi Glacier No.1 in the Tianshan Mountains from November 2004 to March 2006,and analyzed the concentrations of nitrate（NO3 - ） and ammonium（NH4 ＋）.The results indicated that the mean ion concentration at firn bottom was higher in the dry season（from November to March）than that in the wet season（from April to October）,and the mean ion concentration at the ice top was higher in the wet season than that in the dry season,which was observed at the firn-ice interface with the widths of 5 cm and 15 cm,respectively;the mean concentration ratio of ions between the firn bottom and the ice top in the dry season was generally higher than that in the wet season,suggesting that during the dry season the concentration at the firn bottom was generally higher than that at the ice top,whereas during the wet season the situation was quite opposite;the ion transportation at the firn-ice interface constituted a process of recording the environmental information,which was influenced by the melt water of snowpack,air temperature and some other factors.
出处
《地球学报》
EI
CAS
CSCD
北大核心
2011年第6期699-706,共8页
Acta Geoscientica Sinica
基金
国家自然科学基金项目(编号:41161012、40701035)
教育部新世纪优秀人才支持计划项目(编号:NCET-10-0019)
国家重点基础研究发展计划(973)项目(编号:2010CB951003)
中国科学院知识创新工程重要方向项目(编号:KZCX2-EW-311)
冰冻圈科学国家重点实验室自主基金项目(编号:SKLCS-ZZ-2010-04)联合资助
