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青藏高原西部纳木那尼冰芯同位素记录的气候意义初探 被引量:14

A PRIMARY RECOGNITION ON THE CLIMATIC SIGNIFICANCE OF ICE CORE ISOTOPE RECORD IN NAIMONA'NYI OF WEST TIBETAN PLATEAU
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摘要 纳木那尼冰川是喜马拉雅山西部地区规模较大的冰川之一,也是开展冰芯气候意义研究有重要潜在价值的冰川。但由于纳木那尼冰川位于西风环流和印度季风影响范围的交界带,不同的环流系统所输送的水汽带来不同的降水稳定同位素信号。因此确定纳木那尼冰芯同位素记录的气候意义是开展该地区冰芯气候记录研究的前提条件。2008年在该冰川积累区所钻取的8.78m浅冰芯为这一研究工作提供了可能。本文对该冰芯的稳定同位素记录以及普兰气象站的气象数据进行了分析与讨论。研究结果表明,同位素的年际变化与当地普兰县气象站气温的年际变化具有较好的对应关系。这可能与当地降水受到夏季季风的影响较小有关。测量结果表明早期的深冰芯钻取点位于冰川的消融区,而冰川的积累区仍位于冰川更高的区域,而且积累区冰川厚度更大,更有可能保存更长时间尺度的冰芯记录。这也为以后开展新的纳木那尼深孔冰芯及气候意义研究提供了借鉴。 Naimona'nyi Peak,with altitude of 7694m, is one of the highest peaks in West Himalayas. Glaciers flow from the center of the peak to each side. Naimona'nyi glacier is one of the largest glaciers in West Himalayas, and also the potential glacier for deep ice core study. This glacier locates in the boundary area between the westerly atmospheric circulation system and Indian monsoon system, and different moisture supplies bring precipitation with different isotopic signals. It is thus important to validate the climate significance of the isotope record from Naimona'nyi ice cores. An 8.78-meter shallow ice core drilled in 2008 on this glacier threw light on the explanation of the isotopic record. This ice core (30°26.5′N, 81°19.5′E ;6100m a. s. 1. )was drilled in the accumulation area of the glacier,and it was dated back to 2001 by the clear seasonality of 6aSO record. Results shows the annual o^SO variation matches pretty well with the local annual air temperature at Burang(30°17′N ,81°15′N ;3900m a. s. 1. ) , with a square coefficient of 0.4. From the spatial variation,there is an abrupt shift of the ice core δ^18O record from the temperature-dependant in the northern plateau to the precipitation-dependent in the southern plateau. The result from this Naimona'nyi shallow ice core indicates that the δ^18O in the Naimona'nyi ice core reflect temperature change,and implies that the Naimona'nyi glacier precipitation is less impacted by the summer monsoon impact. This can also be supported by the seasonal precipitation patterns at the Burang meteorological station,where the monsoon signal is only limited in the July and August precipitation. The annual accumulation rate from this ice core is 775mm water equivalent during 2001 -2008, about 5 times of annual precipitation at the Burang meteorological station, showing the higher precipitation zone in glacier region and probably implying different moisture sources at high elevation. The result also demonstrates that the earlier ice cores we
出处 《第四纪研究》 CAS CSCD 北大核心 2012年第1期46-52,共7页 Quaternary Sciences
基金 全球变化研究国家重大科学研究计划项目(批准号:2010CB951702) 国家杰出青年基金项目(批准号:41025002) 中国科学院知识创新工程重要方向项目(批准号:KZCX2-YW-Q09-03和KZCX2-YW-GJ05)资助
关键词 纳木那尼冰川 冰芯 氧稳定同位素 气温 气候意义 Naimona'nyi glacier, ice core, isotope signal,temperature, climate significance
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