地理学报 ›› 2004, Vol. 59 ›› Issue (5): 709-715.doi: 10.11821/xb200405008

• 气候变化 • 上一篇    下一篇

Lambert冰川流域东西两侧气候环境变化

张明军1,2, 效存德2, 任贾文2, 李忠勤2, 秦大河2   

  1. 1. 西北师范大学地理与环境科学学院, 兰州 730070;
    2. 中国科学院寒区旱区环境与工程研究所, 兰州 730000
  • 收稿日期:2004-01-08 修回日期:2004-04-09 出版日期:2004-09-25 发布日期:2010-09-09
  • 作者简介:张明军 (1975-), 男, 甘肃宁县人, 博士, 副教授, 主要从事冰川与环境演变方面的研究。 E-mail: zhangmj@ns.lzb.ac.cn
  • 基金资助:

    科技部国际合作重点项目 (2001CB711003); 国家自然科学基金项目 (40305007); 西北师范大学科技与知识创新工程项目 (NWNU-KJCXGC-02-20)

Climatic and Environmental Features on Both Sides of the Lambert Glacier Basin

ZHANG Mingjun1,2, XIAO Cunde2, REN Jiawen2, LI Zhongqin2, QIN Dahe2   

  1. 1. Geography and Environment College of Northwest Normal University, Lanzhou 730070, China;
    2. Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou 730000, China
  • Received:2004-01-08 Revised:2004-04-09 Online:2004-09-25 Published:2010-09-09
  • Supported by:

    The Key International Cooperation Project of Ministry of Science and Technology of China, No.2001CB711003; National Natural Science Foundation of China, No.40305007; The Science and Technology Innovation Project of Northwest Normal University, No. NWNU-KJCXGC-02-20

摘要:

1992~1993年,中国科学家参加了澳大利亚南极考察队对Lambert冰川流域西侧的考察,1996起,中国南极考察队对Lambert流域东侧进行了多次考察。本文基于以上考察的研究成果,对Lambert冰川流域东西两侧气候环境变化特征进行了对比研究。结果表明:Lambert冰川两侧无论是降水还是温度,在几十年时间尺度上其变化趋势都存在着明显差异,Lambert冰川东西两侧从海岸向内陆近500 km断面上表面积累速率的分布截然不同,同时,Lambert冰川东西两侧的δ18O随温度的变化率 (又简称δ-温度梯度) 差别也很大,另外,反映水汽输送强度的海盐离子浓度近50年来的变化趋势相反。以上证据表明,Lambert冰川谷地可能是东南极洲一条重要的气候界线,其原因可能是特殊的局地环流 (顺时针的气旋活动) 导致不同的水汽来源,再加上局部地形的影响所致。

关键词: Lambert冰川流域, 气温, 降水, 水汽输送, 地形

Abstract:

During the 1992-1993 joint Australian-Chinese over-snow traverse on the western Lambert Glacier Basin (LGB), two firn cores were drilled respectively at MGA and LGB16. During the 1996-1997 and 1997-1998 austral summers, two firn cores were drilled respectively at DT001 and DT085 on the eastern LGB. Based on the achievements made during the expeditions, the climatic and environmental features on both sides of the LGB have been studied. Results show that during the past 50 years, the trends of both air temperature and accumulation rate show a slight increase on the east side of the LGB, in contrast to the west side of the LGB. The spatial trends of the accumulation rate measured by accumulation canes at 2 km intervals along the nearly 500 km of the traverse lines on both sides of the LGB are different. Moreover, correlations of δ18O vs T10 along the two sides of the LGB are also different. In addition, the variations of sea salt ion concentrations show different trends in the past 50 years. All the evidences show the Lambert Glacier is a dividing region for the different climatic regimes over the East Antarctic ice sheet, which may be due to different moisture resources resulted from the special local circumfluence such as cyclone activities and local terrain influences. The International Trans-Antarctic Scientific Expedition (ITASE) has its initial aim to reveal an overall spatial pattern of climatic change on Antarctic ice sheet for the past 200 years. This study re-confirms the importance of continental to regional scaled circulation to annual-decadal scaled climatic change in Antarctica.

Key words: Lambert Glacier Basin air, temperature, precipitation, moisture transportation and terrain