摘要
极地冰芯包含了大气循环的各种信息,微粒作为其中一个重要的参数,在揭示古环境和古气候信息中起着很重要的作用。冰芯中微粒的含量变化可用于年层的划分,矿物和粒径特征可以用于源区以及大气本底值的研究。另外,微粒记录中还包含了火山、沙尘暴以及人类活动等特殊事件的信息。在过去的 50年间,在几大冰芯研究的基础上,极地冰芯微粒的分析工作已取得了很大的成果。近年来,得益于测试水平的迅速提高,微粒研究工作有了长足进展。展望未来,人们将会开拓更新的研究领域。
There are various kinds of information recorded in the polar ice core. In the past research, microparticles have been playing a significant role in implicating paleo-environment and paleo-climate. To sum up, the concentration of microparticles is high in winter and low in summer, and moreover, it behaves high in cold term and low in warm term. Past work on microparticles in ice core is discussed in this paper as a summary. Emphasis is laid on the achievement acquired from the ice cores drilled in Polar region. Ice age can be determined based on the seasonal character of microparticles. For shallow ice cores, dating is accurate just according to microparticles. But for deep ice cores, it must be carried on together with oxygen isotopes. The mineral and radius characteristics can implicate the source and the background value. Furthermore, information of atmosphere circumfluence, intensity of the wind power, droughts, volcano, sandstorm, etc will also be recorded in them. Human factors in global change are always the hotspot of research. In recent years, burning source and carbon are talked much more than before. In the analysis of Euro-core in Greenland, three different types of burning source are found, which will be much helpful in tracing the hunman information. In spite of the immense achievement people have got, there are still lots of difficulties in analysis and sampling. In the past decades, much work has been done on the analysis technique of particles. There are four main methods now in use. Firstly, optics microscope and XEDS are used in the analysis of the single particle, but it is limited to 5μm. Secondly and regularly, Counlter analyzer is used in measuring the quantity and radius of microparticles by the current between the two electrodes. This method is fit for the scale between 0.4~1200μm. Third, after getting enough samples by largely melting, XRD, microscopes, thermionization mass spectrum are utilized in finding out the characters of microparticles on mineralogy, isotopes and granularity. Fin
出处
《地球科学进展》
CAS
CSCD
北大核心
2005年第2期216-222,共7页
Advances in Earth Science
基金
国家自然科学基金项目"东南极冰盖雪气冰界面化学迁移
物质通量与气候记录"(编号: 49973006 )
科技部科技基础性工作专项"南极地区地球环境监测与关键过程研究--东南极雪冰现代过程研究
埃默里冰架变化及其底部过程监测"(编号: 2001DIA50040)资助.
关键词
微粒
冰芯
气溶胶
极地
Particle
Ice core
Aerosol
Pole.
