摘要
中国首次南极内陆冰盖考察获得的50m冰芯的雪冰化学资料研究表明:南极伊利莎白公主地海盐离子浓度季节变化特征明显,为冰芯定年提供了可靠的依据。伊利莎白公主地雪冰中Cl^-、Na^+和Mg^(2+)等海盐离子浓度与南极冰盖其它地方相当,而Ca^(2+)含量异常的高,可能与局地较强的陆地源有关。近150年来,伊利莎白公主地海盐离子浓度具有明显升高的趋势,可能是整个南半球100多年来升温的结果。
A 50 m firn core drilled in Princess Elizabeth Land, Antarctica, during the 1996/1997 Chinese First Antarctic Inland Expedition, has been measured for major ions. Based on the high quality of the seasonal variations of major ions, the firn core was dated with errors within ±3 years. The 51. 85 m firn core record extends for 251 years (A. D. 1745 -1996). The results of the glaciochemistry data of the firn core show that the mean concentrations of Cl-, Na+ and Mg2 + are similar to those reported from other coastal areas in East Antarctica. However, mean concentrations of Ca2 + are much higher than those reported from other regions, this anomaly phenomenon may be related to the strong local terrestrial sources. It is found that the variations of three kinds of sea salt ions (Cl-, Na+ and Mg2+) in the past 150 years show very similarly rising trends, which may be the results the Southern Hemisphere warming in the past century.
出处
《地理科学》
CSCD
北大核心
2003年第5期560-563,共4页
Scientia Geographica Sinica
基金
中国科学院知识创新工程项目(KZCX2-303)
科技部国际合作重点项目(2001CB711003)
科技部社会公益项目(2001DIA50040)
国家自然科学基金(49971021
40071025)
