我国和印度8个典型站点大气降水氧同位素与降水量的关系  

Interannual correlations between modern precipitation δ^(18)O and precipitation amount recorded by GNIP stations in China and India

作　　者：李云霞[1] 饶志国[1] 刘小康[1] 金明[1] 陈发虎[1] 

机构地区：[1]兰州大学两郎环境教育部重点实验室,兰州730000

出　　处：《科学通报》2015年第8期741-743,共3页Chinese Science Bulletin

基　　金：国家自然科学基金(41372181,41171091);兰州大学中央高校基本科研业务费专项(lzujbky-2011-82)资助

摘　　要：对来自GNIP的我国和印度8个站点的加权平均年大气降水氧同位素(δ18Op)和年降水量数据进行的线性相关分析结果表明:我国华南地区的δ18Op与降水量的关系不显著,说明用该区域相关的古记录来指示降水量的变化,其价值和意义是有限的;印度季风区4个站点的δ18Op与年降水量之间普遍更显著的负相关关系,说明印度季风区δ18Op变化很可能受控于年际尺度的"降水量效应",印度夏季风强度变化可能通过"瑞利分馏效应"对东亚季风区δ18Op产生重要影响.In the present study, linear correlations between weighted-average annual precipitation oxygen isotopes （^18Op） and annual precipitation amount （original data from five Chinese and three Indian GNIP stations, respectively） demonstrated that： 1） correlation between δ^18Op and annual precipitation amount is insignificant in southern China, so the significance of relevant geological proxyls records as indicators of variations in past precipitation amount is limited in this area; 2） overall, negative correlations between δ^18Op and annual precipitation amount at the four stations in the Indian monsoon region are much more significant than those for the four stations in the East Asian monsoon region. This indicates that δ^18Op in the Indian monsoon region is probably controlled by an interannual ＂amount＂ effect, and δ^18Op in the East Asian monsoon region may be strongly influenced by variations in Indian summer monsoon intensity via the Raleigh fractionation effect.

关 键 词：大气降水氧同位素 降水量 东亚夏季风 印度夏季风 

分 类 号：P426.6[天文地球—大气科学及气象学]