湖北宜昌地区大气降水中的稳定同位素特征  

Stable Isotopic Characteristics of Atmospheric Precipitation from Yichang,Hubei

作　　者：赵家成[1,2] 魏宝华[1] 肖尚斌[1,3] 

机构地区：[1]三峡大学湖北省水电工程施工与管理重点实验室,湖北宜昌443002 [2]中国地质大学(武汉),武汉430074 [3]中科院地球环境研究所,西安710075

出　　处：《热带地理》2009年第6期526-531,共6页Tropical Geography

基　　金：湖北省青年杰出人才基金(2008CDB382);中国科学院山地灾害与地表过程重点实验室开放基金

摘　　要：根据宜昌2007年5—11月大气降水中稳定同位素和气象资料,分析了宜昌地区大气降水中稳定同位素的变化特征。结果表明,宜昌降水中氘过剩值(d)偏高,说明宜昌地区大气降水的水汽原蒸发较快;稳定同位素与降水时的平均温度呈正相关,并且存在阶段性差异,δ^(18)O的分馏时段与δD相反;但与降水量的相关性不明显,只表现在夏季的6月和7月。研究得出,宜昌大气降水线与全球和全国存在差异,主要体现在宜昌的地理环境、地理背景以及宜昌的大气环流模式上。Based on the stable isotope analysis of precipitation and the meteorological records in 2007（from May to November） of Yichang, the stable isotope characteristics of changing atmospheric precipitation are analyzed. The results show that： deuterium is surplus in precipitation and variable between months. There is a positive correlation between the stable isotope values and the mean temperature during precipitation, with differences in phase. The δ^18O fractionation shows an inverse pattern in time with δD, but relative to the amount of precipitation, is not obviously except in June and July. This study shows that the meteoric water line equation of Yichang is different from the global and regional pattern. It＇s mainly owing to the geographical environment, the geomorphological background as well as the atmospheric circulation patterns in Yichang.

关 键 词：大气降水 温度 稳定同位素 宜昌 

分 类 号：P426.612[天文地球—大气科学及气象学]