摘要
冰芯中的微粒是反映大气粉尘的直接指标,其研究内容包括浓度、通量、粒径和矿物组成等在不同时期的变化特征以及其对全球气候的影响.简要地介绍大气粉尘对全球气候的影响,总结了近年来冰芯中的微粒研究以及用于解释末次冰盛期时高粉尘的几个气候模型的主要进展,着重讨论利用微粒的同位素特征来确定其来源以及利用微粒记录进行定年的方法与结果.
The atmospheric dust is one of the most important factors in studying the global climate changes. Its effects include the scatter and reflect of solar insulation, the supply to the iron fertilizer to ocean, and its restrain to rain. The insoluble microparticle in ice cores is a direct proxy for atmospheric dust. Many researches have been carried out for microparticles in ice cores, including concentration, flux, size distribution, composition,and its application in dating. In this paper, the main progresses in ice core microparticle studies in the past decades are introduced. The isotope composition of microparticles, such as ^87Sr/^86Sr,^206Pb/^201Pb, and ENd, along with REE feature and mineralogy, are used to discern the different potential source areas. It is interesting that the dust in Greenland ice sheet comes from Central Asia arid and semiarid areas, especially the Taklimakan Desert. The seasonal change of dust record can be used to date ice core, which is very useful for those thinner annual layers in the lower part of ice core.In most ice cores, high dust concentration emerged during the Last Glacial Maximum, except the Guliya and Sajama. The expansion of dust source area, weak hydrological cycle, stronger wind, change in atmosphere circulation,and increase in latitudinal temperature gradient are the potential causes for high atmospheric dust in LGM.
出处
《冰川冻土》
CSCD
北大核心
2005年第4期528-538,共11页
Journal of Glaciology and Geocryology
基金
国家自然科学基金项目(40301009)
国家自然科学基金创新群体项目(40121101)
国家自然科学基金重点项目90102005)
中国科学院知识创新工程项目(KZCX3-SW-339)资助
关键词
冰芯
微粒
大气粉尘
气候变化
ice core
microparticle
atmospheric dust
climatic change
作者简介
邬光剑（1972-），男，四川洪雅人，副研究员，2001年在兰州大学地理系获博士学位，现主要从事冰芯与环境变化研究。E-mail：wugj@itpcas．ac．cn。
