武汉市大气降水δD和δ18O变化特征及水汽来源

doi:10.16232/j.cnki.1001-4179.2017.13.008

摘要/Abstract

摘要： 为了确定长江流域中游大气降水特征和水汽来源，以全球大气降水观测网（GNIP）武汉站点多年大气降水稳定同位素数据为基础，探讨了长江中游武汉地区大气降水稳定同位素随季节变化特征。通过建立当地大气降水方程，结合气象因素和降水氘盈余变化，揭示了武汉地区不同季节大气降水水汽来源。结果表明：大气降水在降落地面之前经历了非平衡分馏过程，且平衡程度接近于东部季风沿海地区；大气降水稳定同位素表现出明显的季节性特征，且冬季和夏季降水δD和δ18O值与雨量之间负相关，表现出明显的“雨量效应”；大气降水水汽来源主要受季风活动的控制，冬季水汽主要来自北方大陆冷湿气流，而春季降水表现出局地蒸发来源，夏季和秋季降水来源受西南季风和东南季风的双重影响。

关键词: 大气降水, 稳定同位素, 水汽来源, 长江中游, 武汉市

Abstract: To determine the precipitation characteristics and water-vapor sources in the middle reach of Changjiang River, we discuss the seasonal variations of δD and δ18O in Wuhan City on the basis of stable isotopic data in meteoric water of Wuhan from Global Network of Isotopes in precipitation (GNIP). According to climatic factors and variation of deuterium surplus in precipitation, the origins of precipitation water-vapor in different seasons are revealed through establishing of Local meteoric water line (LMWL). The results show that rainwater has experienced imbalance fractionation before falling to the ground and the balancing level approximates to east monsoon coastal region. The stable isotopic data in meteoric water has evident seasonal feature. "Temperature effect" has not been observed as δD and δ18O values in meteoric water of winter and summer are negatively correlated to temperature. However, the negative correlation between isotopic value and precipitation indicates "rainfall effect". Besides, the water vapor sources are mainly controlled by monsoon activities. Specifically, the water vapor in winter mainly comes from the northern continental cold wet airflow and water vapor in spring is mainly contributed by local re-evaporation. In contrast, water vapor in summer and autumn is the result of duple influences of southeast monsoon and southwest monsoon.

Key words: meteoric water, stable isotope, water-vapor source, middle reach of Changjiang River, Wuhan City

谷金钰，张文杰，许文盛，张平仓. 武汉市大气降水δD和δ18O变化特征及水汽来源[J]. 人民长江, doi: 10.16232/j.cnki.1001-4179.2017.13.008.

GU Jinyu, ZHANG Wenjie, XU Wensheng, ZHANG Pingcang. Characteristics of δD and δ18O in precipitation and water-vapor sources in Wuhan, middle reach of Changjiang River[J]. , doi: 10.16232/j.cnki.1001-4179.2017.13.008.

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武汉市大气降水δD和δ18O变化特征及水汽来源

Characteristics of δD and δ18O in precipitation and water-vapor sources in Wuhan, middle reach of Changjiang River

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