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• CN 62-1072/P
• ISSN 1000-0240
• 创刊于1979年
• 主管单位：中国科学院
• 主办单位：中国科学院寒区旱区
•                  环境与工程研究所
•                  中国地理学会

• 气候与水资源变化 •

### 不同时间尺度下的稳定同位素变化

1. 1. 湖南师范大学, 资源与环境科学学院, 湖南, 长沙, 410081;
2. 中国科学院, 寒区旱区环境与工程研究所冰芯与寒区环境重点实验室, 甘肃, 兰州, 730000
3. 中国气象科学研究院, 北京, 100081
• 收稿日期:2002-10-16 修回日期:2003-01-08 出版日期:2003-08-25 发布日期:2012-04-26
• 作者简介:章新平(1956- ),男,湖南长沙人,教授,1993年在中国科学院兰州冰川冻土研究所获博士学位,现从事全球变化的研究.E-mail:zxp@mail.hunnu.edu.cn
• 基金资助:
国家自然科学基金项目(40271025);国家863研究项目(2002AA135360)资助

### Isotopic Variations under Different Time Scales

ZHANG Xin-ping1,2, YAO Tan-dong2, LIU Jing-miao3, TIAN Li-de2

1. 1. Institute of Resources and Environment, Hunan Normal University, Changsha Hunan 410081, China;
2. Key Laboratoryof Ice Core and Cold Regions Enviromment, CAREERI, CAS, Lanzhou Gansu 730000, China;
3. Chinese Academy of Meteorological Sciences, Beijing 100081, China
• Received:2002-10-16 Revised:2003-01-08 Online:2003-08-25 Published:2012-04-26

Abstract: The temporal and spatial variations of stable isotopic composition in precipitation under different time scales are analyzed using the data of 12 IAEA/WMO sampling stations that have long-term series in the Northern Hemisphere. Under seasonal scale, the elected 12 stations have notable amount effect, and the magnitude of δ18O/precipitation gradient is indirectly proportional to precipitation at a certain extent. The analyses show that the amount effect is not only related to strong convection of generating heavy rainfall but also to seasonal distribution of precipitation. For the latter, the seasonal distribution of mean precipitation is just contrary to that of mean temperature. Under annual scale, 11 among the 12 stations have temperature effect of certain degree. The only exception, Valentia, is located in Ireland and borders on the North Atlantic. The different weather systems and vapor origins complicate stable isotopic variations in precipitation. Comparatively, the mean δ18O/temperature gradient at mid-low latitudes is greater than that at mid-high latitudes. The composite positive correlation between δ18O and temperature is more marked, compared with that of single station, showing the interannual variation of δ18O is mainly controlled by large-scale weather condition and mirrors the environmental and climatic change on large-scale space, but no local influence. Additionally, the interannual variation of the composite annual weighted mean δ18O is in agreement with that of the mean annual temperature: the mean δ18O and mean temperature is -5.57‰ and 20.59℃, respectively, in the 1960s of the 20th Century. The mean δ18O and temperature changed at a low level successively after the 1970s and got the minimums, -9.06‰ and 13.91℃, in the early 1980s, decreased by 3.59‰ and 7.22℃, respectively, compared with the maximum values in 1970, in this period. Since then, the mean δ18O and mean temperature went up successively, and got the new highs, -5.23‰ and 20.38℃ respectively, increased by 3.82‰ and 6.47℃ compared with the minimums in the 1980s. Comparatively, the fluctuant extent of δ18O curve is markedly greater than that of temperature curve, showing that, from another aspect, the δ18O under annual scale has globality.

• P426.61+2