东南极Lambert冰川流域路线考察  

A Traverse Expedition to the Lambert Glacier Basin,Eastern Antarctica

作　　者：任贾文[1] 

机构地区：[1]中国科学院兰州冰川冻土研究所

出　　处：《冰川冻土》1995年第4期303-307,共5页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金;中国科学院兰州冰川冻土研究所冰芯与寒区环境实验室资助

摘　　要：Ｌａｍｂｅｒｔ冰川是Ａｍｅｒｙ冰架的补给源，为东南极冰盖最大的一支冰流。近几年对该冰流源区的路线考察表明，该地区积累速率相当低，大部分观测点低于１５０ｋｇ／（ｍ￣２·ａ）。考察区域表面年平均温度为－４５－３０℃。表面２ｍ雪层的平均密度在４００ｋｇ／ｍ￣３左右变化。在１８３０－２７００ｍ海拔范围内的许多地点曾观测到深霜发育。表面运动速度基本上在２０ｍ／ａ以内。在低积累区，强烈的下降风和表面雪丘的发育使降雪重新堆积，导致应用稳定同位素比率剖面划分年层的可靠性下降。The Lambert Glacier, feeding into the Amery Ice Shelf, is the largest ice stream in the East Antarctic ice sheet. Preliminary results from recent traverse along a route across its inland accumulation area show that the accumulation rate in this area is very low, not exceeding 150 kg/ (m￣2 a) at most sites. The mean annual temperature ranges from -45℃ to -30℃. Average density of surface 2m snow is around 400 kg /m￣3. Depth-hoar is seen at many sites with an elevation between 1830 and 2700 m. The surface velocity is generally within 20 m /a. Snow redistribution caused by strong katabatic-wind and sastrugi brings about an uncertainty in the annual-layer identification using 618O profile in low accumulation area.

关 键 词：南极 冰川 表面特征 积累速率 流域践线 

分 类 号：P343.6[天文地球—水文科学]