极地研究

极地研究 ›› 2002, Vol. 14 ›› Issue (3): 234-242.

• 目次 • 上一篇    

雪冰中宇宙成因核素~(10)Be在第四纪研究中的潜在应用

李翠林;侯书贵   

  • 出版日期:2002-09-30 发布日期:2002-09-30

POTENTIAL APPLICATION OF COSMOGENIC NUCLIDE ~ 10 BE IN ICE AND SNOW FOR QUATERNARY RESEARCH

  • Online:2002-09-30 Published:2002-09-30

PDF (PC)

1500

被引次数

22

摘要：

加速器质谱仪 (AMS)的发展使高精度测量宇宙成因核素1 0 Be并应用于研究天文、地理和古气候成为可能。雪冰中的1 0 Be浓度可以指示古降水量的变化 ,其在大气中的产率变化则可以反映三个主要控制因素 :原始宇宙射线强度、地磁场强度和太阳活动的变化。此外 ,配合其它宇宙成因核素 ,1 0 Be还能用于定年 ,并利用特殊“峰”帮助一些古老冰芯建立年代表 ,提供可作为全球对比标志的特殊信息。青藏高原因其特有的高海拔地势而拥有丰富的中低纬山地冰川资源 ,其冰雪中的1 0 Be资料可能提供比极地高纬资料更清晰的1 0 Be与大气环流、地磁场屏蔽作用关系的信息 ,将是对1 0 Be现有认识的极好补充。

关键词: 加速器质谱仪;宇宙成因核素;10Be;第四纪研究

Abstract:

The progress in accelerator mass spectrometry made it possible to investigate astronomy, geography and paleoclimate by high precision measurements of cosmogenic 10 Be from various archives. Preceding investigations suggested that the 10 Be concentration could be used to indicate variation in the past precipitation, and its production rate in the atmosphere represented three control factors: primary cosmic ray intensity, solar activity and geomagnetic variations. Moreover,with the help of other cosmogenic nuclides, 10 Be can be used to date old ice layer and provide special information for global comparison. The Qinghai-Xizang plateau in the west china has ample resources of mountainous glacier due to its unique high elevation. For the mid-low- latitude location and peculiar atmospheric circulation pattern, it will be a necessary supplement to the now-existing polar 10 Be datum in providing more detail information of the geomagnetic shielding and climatic influence on the 10 Be.

Key words: null