摘要
本文综述了水汽来源状况、降水季节变化、火山喷发、太阳活动等气候环境因素对极地冰雪中同位素含量的可能影响及其程度 ,以及降水区域不均衡性、降水年际不均衡性、逆温层和同位素在冰雪中的扩散迁移作用等几种不稳定因素可能对冰雪同位素分析造成的干扰 ;在此基础上 ,综述了极地冰雪中δ1 8O、δD和其差值d(d =δD - 8δ1 8O)与局部或全球气温之间的一些线性关系 (包括全球尺度 ,格陵兰地区 ,南极地区等 )
The isotopic composition of oxygen and hydrogen (δ 18 O, δD) in polar snow and ice can provide information on local or global temperature in the past, because there are some simple linear relationships between δ 18 O (or δD) and temperature. But there are many other factors that influence δ 18 O and δD in polar snow and ice, such as vapor sources and seasonal changes of precipitation, volcanic activities and solar activities. Some factors must be considered when temperature record would be reconstructed from δ 18 O (or δD) in snow and ice, which include spatial and temporal variations of precipitation, the temperature in the inversion layer and the processes of post deposition. Some linear relationships among δ 18 O, δD and temperature have been obtained for Greenland ice sheet, as δ 18 O=0.67T-13.7‰, for Antarctic ice sheet, as δD=6.04T-51‰, and there is a statistic relationship between δD and δ 18 O, as δD=8δ 18 O+10 on globe, based on analysis of data and modeling. Moreover, the deuterium excess d (or excess d) =δD-8δ 18 O in polar ice sheets is sensitive to the conditions of water moisture sources including sea surface temperature, relative humidity and surface wind. It has been found from research on excess d in Antarctic that water moisture of inland mainly comes from ocean area at lower latitudes and water moisture near the coast mainly from the local sea.
出处
《极地研究》
CAS
CSCD
2002年第1期73-80,共8页
Chinese Journal of Polar Research
基金
国家"十五"社会公益性项目"南极地区地球环境监测与关键过程研究"和"中国南极考察科学研究计划"项目 ( 2 0 0 1DIA50 0 4 0 0 3)
"上海市引进海外高层次留学人员专项资金资助项目"。
关键词
极地
冰雪
氢氧同位素指标
指示意义
Arctic and Antarctic, snow and ice, oxygen and hydrogen isotopes
