乌鲁木齐大气降水稳定同位素与水汽来源关系研究  

Characteristics of stable isotopes in precipitation and the water vapor sources in Urumqi

作　　者：侯典炯[1] 秦翔[1] 吴锦奎[1,2,3] 杜文涛[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冰冻圈科学国家重点实验室祁连山冰川与生态环境观测研究站,兰州730000 [2]中国科学院寒区旱区环境与工程研究所流域水文及应用生态实验室,兰州730000 [3]吉森大学景观生态与资源管理研究所,吉森35392

出　　处：《干旱区资源与环境》2011年第10期136-142,共7页Journal of Arid Land Resources and Environment

基　　金：(973项目)国家重点基础研究发展计划项目"我国冰冻圈动态过程及其对气候;水文和生态的影响机理与适应对策(编号:2007CB411503;2007CB411502);中德合作项目"Matter fluxes in Inner Mongolia as influenced by stocking rate(MAGIM)"(German Science Foundation(DFG);FG 536)资助

摘　　要：利用GNIP(Global of Isotope in Precipitation)乌鲁木齐站点1986-2003年大气降水稳定同位素资料和美国国家环境保护委员会/国家大气研究中心(NCEP/NCAR)再分析资料,通过研究乌鲁木齐地区17年(1986-2003)大气降水的氢、氧稳定同位素组成,提出了局地大气降水线方程为δD=7.10δ18O+2.27(R2=0.94),并与全国及全球降水线方程进行对比,揭示了在干旱区该方程的特征。对全年过量氘、水汽输送和降水线特征的研究表明,乌鲁木齐地区大气降水在凝结过程中以动力分馏为主,西风带的水汽输送为该地区提供了基本的水汽来源,西风带季节变化对其水汽输送通量散度和d值季节变化有直接的作用。大气降水中氢、氧同位素组成呈明显的温度效应,δ18O温度效应方程为δ18O(‰)=0.39T(℃)-15.39(R2=0.72),但观察不到明显的降水量效应。As part contribution of Global of Isotope in Precipitation（GNIP）,the stable isotopic compositions in precipitation at Urumqi during 1986-2003 were analyzed.The results showed that the δD/δ18O ratio is 7.10,and the comparison with other domestic regions demonstrated its arid characteristics.The analysis of exD,water vapor transport and precipitation line suggested the kinetic fractionated process domains in precipitation condensation;the westerly belt is the major vapor transmission carrier and its seasonal changes has a direct influence on the variability of the water vapor flux divergence and exD.The δ18O-T ratio of 0.39 ‰ ℃-1 was also observed and there isn＇t an obvious precipitation effect.

关 键 词：大气降水 稳定同位素 温度效应 水汽输送 乌鲁木齐 

分 类 号：P426[天文地球—大气科学及气象学]