| 中国典型山地温冰川水化学空间分布特征与近期冰川动态 |
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| 引用本文： | 何元庆,姚檀栋,杨梅学.中国典型山地温冰川水化学空间分布特征与近期冰川动态[J].山地学报,2000,18(6):481-488. |
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| 作者姓名： | 何元庆 姚檀栋 杨梅学 |
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| 作者单位： | 中国科学院寒区旱区环境与工程研究所，甘肃兰州 730000 |
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| 基金项目： | 中国科学院寒区旱区环境与工程研究所创新项目(210019)，中国科学院冰冻圈动态变化基础研究特别经费(3期)，中科院知识创新领域前沿(KZCX2-301)项目，中科院院长基金和留学择优基金资助的研究成果。 |
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| 摘 要： | 从我国玉龙雪玉典型温水王白水１号冰川不同区段表面融水，新近积雪和冰川初给河水采样分析结果表明，雪线以下降水中的稳定同位素的离子含量比雪线以下为高，低海拔河水比高海拨融水的氧同浓度为低，可能在来源上存在着差异，这种分布特征说明本温冰川区局部大气环流情况高度而不同，有可能存在季气候区所特有的“降水量效应”或“季节性效应”。冰川不同水体内离子浓度变化说明，冰川融水与地壳表面接触时间越久，其中的可融性离了
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| 关 键 词： | 温冰川 水化学 冰川动态 空间分布 气候 积雪 |
| 文章编号： | 1008-2786(2000)06-0481-08 |
| 修稿时间： | 2000年6月12日 |
SPATIAL FEATURES OF GLACIAL HYDRO-CHEMISTRY AND RECENT VARIATIONS OF A CHINESE TEMPERATE GLACIER IN MT. YULONG |
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| HE Yuan-Qing,YAO Tan-dong,YANG Mei-xue.SPATIAL FEATURES OF GLACIAL HYDRO-CHEMISTRY AND RECENT VARIATIONS OF A CHINESE TEMPERATE GLACIER IN MT. YULONG[J].Journal of Mountain Research,2000,18(6):481-488. |
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| Authors: | HE Yuan-Qing YAO Tan-dong YANG Mei-xue |
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| Abstract: | Mt. Yulong is the southmost present glacialized area in Eurasia,where there are 19 typical sub-tropics temperate glaciers above 4000m a. s. l., formed under the climate of south-west monsoon. In the summer of 1999, investigations of glacial hydro-chemistry were carried out at the largest glacier, Baishui No. 1 and 23 samples were collected from new accumulated snow, summer rain, glacial meltwater and glacier-feeding river at the different levels of the glacier. Chemical analysis of these samples show that isotopic and ionic contents of precipitation above the equilibrium line (4 800 m) is much higher than that below it, implying that the atmospheric vapor for precipitation came from different sources and a ”precipitation effect” or ”monsoon effect” may exist in this typical monsoon-climate region. Ionic contents of glacial meltwater were increasing with the decrease of elevation as a result of longer-time contact with the earth's surface. The highest content of Ca2+ in all collected samples is closely related to local bedrock which mainly compose of limestone. Glacial hydro-chemistry of the studied area is characterized by a distinct spatial variability in various water bodies because of stronger physical and chemical activity of the temperate glacier, which differs from those of the continental glaciers.
Glaciers have greatly retreated after the Little Ice Age because of warming of the climate. The recent 50 year climatic data at Lijiang, the closest meteorological station to Mt. Yulong, indicates that there are 2～3 year periodic changes for the local temperature and apparent 11～12 year periodic cycles for precipitation, showing a corresponding pattern with that in northeastern part of India. During the most recent half-century, glaciers in Mt. Yulong have alternately retreated and advanced, with smaller amplitudes. According to the trend of local climatin last 50 years and recent observation at the glacier Baishui No. 1, the glaciers in Mt. Yulong start to advance in 1998 after a continuous retreat stage between early 1980's and late 1990' s. However, as a result of a negative relation between temperature and precipitation in most cases of this region, the glaciers will keep a relatively stable state in the future overall trends, except for a case of abrupt large-scale global warming. |
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| Keywords: | Mt Yulong temperate glacier glacial hydro-chemistry recent glacial changes |
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