摘要
利用 1996 / 1997年度中国首次南极内陆冰盖考察获得的 5 0m雪芯雪冰化学资料 ,对南极伊利莎白公主地 2 5 0a来的雪冰化学特征进行了初步研究 .结果表明 ,3种海盐离子 (Cl-,Na+ 和Mg2 + )的变化趋势表现出惊人的相似性 ,除个别年份出现高值外 ,变化均较为平缓 ,总体上呈现出略微上升趋势 ;Ca2 + 和K+ 的变化更为平缓 ,总体变化趋势很不明显 ;变化最为剧烈的是NO-3 、NH+ 4和SO2 -4 ,NO-3 和NH+ 4的变化趋势极为相似 ,除变化幅度大外 ,总体变化趋势都表现出较为明显的上升趋势 ,SO2 -4 最为明显的变化特征是记录了过去 2 5 0a来的
A 50-m firn core collected from the Site LGB65 (with an accumulation rate of 127 kg5m -2 5a -1, and an mean annual temperature of {-33^1} ℃) on Princess Elizabeth Land, East Antarctica, during 1996/1997 Chinese First Antarctic Inland Expedition has been analyzed for chemical composition and oxygen isotope ratio. The dating is accurate within ±3 years due to the well-preserved seasonal cycles of major ions. Based on the analyses, the glaciochemistry features in the study region in the past 250 a have first been revealed. It is found that the variations of three kinds of sea salt ions (Cl -, Na + and Mg 2+) in the past 250 a were rather smooth, except for the high concentrations in the very few years, and showed a very similarly slightly rising trend. The variations of Ca 2+ and K + are smoother than those of sea salt ions with a variation trend not obvious. However, the variations of NO+- 3, NH++ 4and SO+{2-} 4 were rather large, the variations of NO+- 3 and NH++ 4 showed a very similarly rising trend. The most positive variation feature of SO+{2-} 4 was that by SO+{2-} 4 concentrations 16 volcanic eruptions were detected in the past 250 a.
出处
《冰川冻土》
CSCD
北大核心
2002年第1期79-82,共4页
Journal of Glaciology and Geocryology
基金
中国科学院知识创新工程项目 (KZCX2 30 3)
国家自然科学基金 ( 4 99710 2 1
497710 2 2 )资助
