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冰川冻土 ›› 2001, Vol. 23 ›› Issue (1): 51-56.

• 研究论文 • 上一篇    下一篇

东南极冰盖中山站——Dome A断面路线考察的初步结果

任贾文, 秦大河, 效存德   

  1. 中国科学院寒区旱区环境与工程研究所冰芯与寒区环境开放研究实验室, 甘肃兰州730000
  • 收稿日期:2000-09-11 修回日期:2000-10-10 出版日期:2001-02-25 发布日期:2012-04-26
  • 基金资助:

    中国科学院知识创新项目(KZCX2-303);中国科学院重大项目(KZ951-A1-205);国家科技攻关计划项目(98-927-01);国家自然科学基金项目(49971021)资助

Preliminary Results of the Inland Expeditions along a Transect from the Zhongshan Station to Dome A, East Antarctica

REN Jia-wen, QIN Da-he, XIAO Cun-de   

  1. Laboratory of Ice Core and Cold Regions Environment, CAREERI, CAS, Lanzhou Gansu 730000, China
  • Received:2000-09-11 Revised:2000-10-10 Online:2001-02-25 Published:2012-04-26

摘要: 1996年以来,中国国家南极考察队连续3次进行了南极冰盖内陆考察,最远点距海岸1100 km,海拔3900m.沿考察路线对冰盖表面地形、表面雪层特征、雪积累速率、冰体厚度和运动速度等进行现场观测,采集0.6~3.3m深度雪坑样品,在4个地点钻取50~100m深度冰芯5支.部分资料和样品的初步分析表明,由于研究区域毗邻Lambert冰川和格罗夫山,冰面地形较多起伏,中段很大区域坡面朝向Lambert冰川.自中山站向内陆460km积累速率为46~210kg·m-2a-1(相当于12~60cm厚度雪层),表面1m深度雪的密度为350~450kg·m-3.雪变成冰的深度(密度达830kg·m-3)在几个冰芯钻取地点均大约为60m,说明研究区域内雪的变质过程基本相同.300km处50m冰芯初步分析显示,过去几十年积累速率和温度均呈上升趋势,这虽然与南极地区其他许多地点的结果相一致,但却和毗邻的Lambert冰川西侧研究结果相反.

关键词: 中国南极内陆考察, 雪积累速率, 气候变化

Abstract: Chinese National Antarctic Research Expedition (CHINARE) has made three inland traverses from the Zhongshan Station to Dome A in East Antarctica since 1996, and the farthest spot arrived (3 900 m a.s.l.) is 1 100 km away from the coast. During these traverses, glaciological investigation (including the ice sheet topography, stratigraphy in snow pits and snow/firn cores, snow accumulation, ice sheet thickness and ice flow velocity, etc.) has been carried out. In addition, snow samples were taken from snow pits (0.6~3.3 m in depth), and five ice cores (50~100 m in length) were recovered at four sites. The primary results show that the surveyed terrain is undulatory due to its adjacence to the Lambert Glacier and Mount Grove, and its facing towards the Lambert Glacier in the middle section of the traverse. Accumulation rate derived from stake measurement within the initial 460 km route is between 12 and 60 cm snow per year, equivalent to 46 to 210 kg·m-2 ·m-1.The average density of 1 m surface snow is between 350 and 450 kg·m-3. The depth of pore close off (corresponding to a density of 830 kg·m-3) is around 60 m at all the ice core drilling sites, which implies that snow metamorphose process is similar in the whole surveyed regions. Study of the 50 m ice core (300 km away from the Zhongshan Station) indicates that both accumulation rate and air temperature has a slight increase, which is consistent to the results deduced from most Antarctic sites, but converse to the situation at the west side of the Lambert Glacier.

Key words: Antarctic Inland Traverse of China, snow accumulation rate, climate change

中图分类号: 

  • P343.6(166.1)