干旱区生态环境知识资源中心(Arid): 近500年来喜马拉雅山达索普冰芯中尘埃含量变化与西、南亚及北非干旱化趋势

Arid

	近500年来喜马拉雅山达索普冰芯中尘埃含量变化与西、南亚及北非干旱化趋势
其他题名	INCREASE IN DUST CONCENTRATION IN THE DASUOPU ICE CORE FROM THE MIDDLE HIMALAYAS AND DRYING TREND IN SOUTH AND WEST ASIA AND NORTH AFRICA OVER THE LAST 500 YEARS
	王宁练 1; 姚檀栋 2
来源期刊	第四纪研究
ISSN	1001-7410
出版年	2012
卷号	32 期号:1 页码:53-58
中文摘要	本文重建了近500年来喜马拉雅山中段达索普冰芯中尘埃浓度与尘埃沉积通量的变化历史，谱分析结果表明它们的变化均存在较显著的12.3年、9.8年、7.4年、6.1年和5.3年周期。该冰芯中尘埃含量与净积累量之间不存在任何相关性，说明其尘埃可能主要来源于上风方向的远源地区。基于后向轨迹法，并结合该地区附近已有的气溶胶研究结果，认为西、南亚甚至北非地区可能是该冰芯中尘埃物质的主要源区。近500年来达索普冰芯中尘埃沉积通量的增加趋势，反映了其源区干旱程度的加重趋势。
英文摘要	In 1997, two ice cores, 149.2m and 167.7m long, respectively, were drilled from the Dasuopu glacier (28°23’N,85°43’E) to bedrock on the col at 7200m a. s. 1. where the average annual net balance is about 1000mm water equivalent. Most of the results presented here are from 167.7m-long core (Dasuopu ice core). Distinct seasonal cycles, particularly in delta~(18)O and dust, make it possible to reconstruct an annual record for the last 500 years from the upper Dasuopu ice core. The variations in dust concentration and dust flux in the Dasuopu ice core showed significant periodicities with lengths of 12.3,9.8,7.4,6.1 and 5.3 years. There was no correlation between dust concentration and accumulation rate. This implied that dust source area should be located in the remote upwind regions. Based on the backward trajectories of air parcels, and along with the study on aerosols in the area near the drilling site by other investigators, it was considered that the long-range transport of dust to the drilling site in the middle Himalayas from arid regions ranging from the South and West Asia to perhaps as far as the Sahara. The increase in dust concentration and dust flux in the Dasuopu ice core over the last 500 years might reflect the drying trend in dust source regions, especially in the last two centuries.
中文关键词	达索普冰芯 ; 尘埃 ; 干旱化 ; 气候变化
英文关键词	Dasuopu ice core dust drying trend climatic change
语种	中文
国家	中国
收录类别	CSCD
WOS类目	METEOROLOGY ATMOSPHERIC SCIENCES ; GEOLOGY
WOS研究方向	Meteorology & Atmospheric Sciences ; Geology
CSCD记录号	CSCD:4431919
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/227916
作者单位	1.中国科学院寒区旱区环境与工程研究所, 冰冻圈科学国家重点实验室, 兰州, 甘肃 730000, 中国; 2.中国科学院青藏高原研究所, 北京 100085, 中国
推荐引用方式 GB/T 7714	王宁练,姚檀栋. 近500年来喜马拉雅山达索普冰芯中尘埃含量变化与西、南亚及北非干旱化趋势[J]. 中国科学院西北生态环境资源研究院,2012,32(1):53-58.
APA	王宁练,&姚檀栋.(2012).近500年来喜马拉雅山达索普冰芯中尘埃含量变化与西、南亚及北非干旱化趋势.第四纪研究,32(1),53-58.
MLA	王宁练,et al."近500年来喜马拉雅山达索普冰芯中尘埃含量变化与西、南亚及北非干旱化趋势".第四纪研究 32.1(2012):53-58.