Thinning of the Ice Sheet Estimated from Total Gas Content of Ice Cores in Mizuho Plateau, East Antarctica
Thinning of the Ice Sheet Estimated from Total Gas Content of Ice Cores in Mizuho Plateau, East Antarctica
复制标题
根据南极洲东部瑞穗高原冰芯总气体含量估算冰盖变薄
作者：
T. Kameda;M. Nakawo;S. Mae;O. Watanabe;R. Naruse
通过对南极瑞穗高原7个浅冰芯的分析，得到了冰中总气体含量与成冰高程（即孔隙关闭）的线性关系。导出的关系式被应用于瑞穗站700 m长冰芯中总气体含量的垂直剖面。总含气量从600 ~ 200 m深度呈逐渐增加的趋势，从600 ~ 200 m深度向上呈急剧增加的趋势。在消除瑞穗站周围冰的下坡流的影响后，估计在过去的2000年中，冰盖的厚度最大减少了约350 m。在同一冰芯的δ 18 O剖面上也有这种趋势。
A linear relation between total gas content in ice and the elevation of ice formation (i.e. pore close-off) was obtained from seven shallow ice cores in Mizuho Plateau, Antarctica. The derived relation was applied to the vertical profile of total gas content in a 700 m long ice core at Mizuho Station. A general trend of gradual increase in total gas content was observed from 600 to 200 m in depth, from which toward the upper layer it showed a steep increase. After eliminating the effect of down-slope flow of ice around Mizuho Station, it was estimated that the thickness of the ice sheet decreased by about 350 m at maximum during the last 2000 years. This tendency also appears in the δ18O profile of the same ice core.