Recent high-resolution glaciochemical record from a Dasuopu firn core of middle Himalayas  

作　　者：WANG PengLing YAO TanDong TIAN LiDe WU GuangJian LI Zhen YANG Wei 

机构地区：[1]Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China [2]National Key Laboratory of Cryospheric Sciences, Chinese Academy of Sciences, Lanzhou 730000, China [3]Graduate University of the Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Chinese Science Bulletin》2008年第3期418-425,共8页

基　　金：the National Basic Research Program of China(Grant No.2005CB422004);the National Natural Science Foundation of China(Grant Nos.40571039 and 40121101)

摘　　要：A 16.8 m firn core of middle Himalayas was recovered on the col of Dasuopu glacier in August 2006,being 7000 m above sea level.A total of 317 samples were measured for stable oxygen isotope ratios(δ18O)and major ion concentrations(Na+,NH4+,K+,Mg2+,Ca2+,Cl?,SO42?,and NO3?).The firn core dating and seasonal partitioning were carried out based on the marked seasonal variations along the stable oxygen isotopes and crustal species(Ca2+,Mg2+)profiles.The multi-parameters and high-resolution glaciochemical data set of Dasuopu firn core recorded the detailed chemical characteristics of pre-cipitation in high-elevation region,middle Himalayas,since 1991 A.D.,which mainly originated from the crustal and anthropogenic sources,while the sea-salt contribution was minor.The seasonal variability of major ion concentrations was dominated by the seasonal alternation of the prevalent air mass,at-mospheric circulation situation and precipitation regime.Linear regression analysis indicated that most of the variance in annual ionic fluxes can be explained by a linear dependence on snow accumu-lation rate.A 16.8 m firn core of middle Himalayas was recovered on the col of Dasuopu glacier in August 2006, being 7000 m above sea level. A total of 317 samples were measured for stable oxygen isotope ratios （6180） and major ion concentrations （Na＋, NH＋, K＋, Mg2＋, Ca2＋, Cl-, SO4^2-, and NO3^-. The firn core dating and seasonal partitioning were carried out based on the marked seasonal variations along the stable oxygen isotopes and crustal species （Ca2＋, Mg2＋） profiles. The multi-parameters and high-resolution glaciochemical data set of Dasuopu firn core recorded the detailed chemical characteristics of pre cipitation in high-elevation region, middle Himalayas, since 1991 A.D., which mainly originated from the crustal and anthropogenic sources, while the sea-salt contribution was minor. The seasonal variability of major ion concentrations was dominated by the seasonal alternation of the prevalent air mass, atmospheric circulation situation and precipitation regime. Linear regression analysis indicated that most of the variance in annual ionic fluxes can be explained by a linear dependence on snow accumulation rate.

关 键 词：喜马拉雅山脉 季节变化 南亚季风 冰川 冰芯 

分 类 号：P343.6[天文地球—水文科学]