珠江流域降水稳定同位素特征及水汽来源  

Stable Isotope Characteristics and Water Vapor Sources of Precipitation in the Pearl River Basin

作　　者：杜康 张北赢 DU Kang;ZHANG Beiying(School of Geography,Geomatics and Planning,Jiangsu Normal University,Xuzhou 221116,China)

机构地区：[1]江苏师范大学地理测绘与城乡规划学院,江苏徐州221116

出　　处：《水文》2020年第6期75-82,共8页Journal of China Hydrology

基　　金：国家自然科学基金项目(41701025);江苏师范大学研究生科研创新计划项目(2019XKT070)。

摘　　要：依据全球大气降水同位素观测网(GNIP)昆明、贵阳、桂林、柳州、海口、广州、香港站点的大气降水稳定同位素资料,建立当地大气降水线方程,分析珠江流域大气降水氧同位素的时空分布特征及其影响因素,并利用HYSPLIT模型追踪珠江流域降水的水汽来源。结果表明:珠江流域大气降水线的斜率、截距与中国及全球大气降水线相近;珠江流域大气降水δ18O值在时间变化上,表现为旱季富集、雨季贫化,从空间分布来看,由东南向西北,δ18O值呈逐渐减小趋势;珠江流域降水中δ18O与降水量和温度呈负相关;HYSPLIT气团轨迹表明,旱季主要是亚欧大陆冬季风、西风带的水汽混合及局地蒸发水汽,雨季以东南季风和西南季风带来的水汽为主。Based on the data of stable isotopes in precipitation at the stations of Kunming,Guiyang,Guilin,Liuzhou,Haikou,Guangzhou and Hong Kong provided by the Global Network of Isotopes in Precipitation(GNIP),the Local Meteoric Water Line(LMWL)functions were established,the spatial and temporal variations of oxygen stable isotopes in precipitation and their influencing factors were analyzed,and the water vapor source of the precipitation in the Pearl River basin is tracked by the HYSPLIT model.The results show that the slope and intercept of the LMWL are close to the Global and China Meteoric Water Line.Theδ18O value in precipitation in the Pearl River basin us enriched in dry season,but poor in rainy season.From the spatial distribution,theδ18O value decreases from the southeast to the northwest.δ18O is negatively correlated with precipitation and temperature.The trajectory of HYSPLIT air mass show that the main water vapor in dry season is the mixture of the winter monsoon and westerly zone,and the main water vapor in rainy season is from southeast monsoon and southwest monsoon.

关 键 词：降水 稳定同位素 同位素效应 气团轨迹 珠江流域 

分 类 号：P426.6[天文地球—大气科学及气象学]