台风“灿鸿”期间中国东部沿海城市降水中稳定同位素的变化及影响因素  

Change and Influencing Factors of δ^(18)O in the Precipitation of Typhoon “CHAN-HOM” at Eastern Coastal Cities in China

作　　者：孙晓双[1] 崔梦月 洪晖[1] 王晓艳[1] 董进国[3] 雷国良[1,2] 姜修洋[1,2] SUN Xiaoshuang;CUI Mengyue;HONG Hui;WANG Xiaoyan;DONG Jinguo;LEI Guoliang;JIANG Xiuyang(Collegeof Geographical Sciences,Fujian Normal University,Key Laboratory of Humid Subtropical Eco-geographical Process,Ministry of Education,Fuzhou 350007,China;Institute of Geography,Fujian Normal University,Fuzhou 350007,China;School of Geographic Science,Nantong University,Nantong 226000,China)

机构地区：[1]福建师范大学地理科学学院,湿润亚热带生态地理过程教育部重点实验室,福州350007 [2]福建师范大学地理研究所,福州350007 [3]南通大学地理科学学院,南通226000

出　　处：《热带地理》2018年第5期651-659,共9页Tropical Geography

基　　金：国家自然科学基金项目(41672170);福建省自然科学基金项目(2017J01654);福建省高校杰出青年科研人才培育计划.

摘　　要：为探讨极端天气降水中稳定同位素的变化,应用2015年9号台风"灿鸿"影响期间中国东部沿海城市台北、温岭、海宁、南通降水中稳定同位素资料,分析降水中稳定同位素的时空变化。结果表明:台风"灿鸿"影响期间,台北降水的δ^(18)O平均值为-4.40‰,为最高值;温岭降水δ^(18)O的平均值最低,为-9.80‰;海宁与南通降水的δ^(18)O平均值居于两者之间,分别为-8.83‰和-7.88‰。4地降水δ^(18)O均呈现出2个阶段的"厂"型变化特征。"灿鸿"降水δ^(18)O值在时空分布上冲刷效应明显,采样站点距离台风中心越近降水δ^(18)O值越低d值越高。台风灿鸿影响期间整个降水过程以湿润的热带海洋气团为主,台北阶段1降水受台风外围云系影响,降水的冲刷程度较轻,δ^(18)O值偏高;台北阶段2降水与温岭降水受单一水汽团冲刷效应影响,降水δ^(18)O不断降低;海宁和南通与灿鸿中心的距离基本相似,且水汽源相同,降水δ^(18)O值波动比较接近。In order to discuss the change of stable isotopic in extreme weather precipitation,the stable isotope data of Taipei(TP),Wenling(WL),Haining(HN)and Nantong(NT)in the eastern coastal cities of China were applied during the impact of typhoon Chan-hom in 2015,analyzing the spatiotemporal changes of stable isotopes in precipitation.This study reveals characteristics of precipitation isotopes composition at the four sites during typhoon.The average value ofδ18O in the“CHAN-HOM”precipitation at TP was-4.40‰,which was the highest value.The lowest value ofδ18O precipitation was-9.80‰at WL.The average values ofδ18O precipitation at HN and NT were-8.83‰and-7.88‰,respectively,which were between those of TP and WL.The pattern of precipitationδ18O at the four sites expressed negative and gradually stable.The rainout effect of precipitationδ18O was obvious.Isotope ratios reveal that the precipitationδ18O decreased inward typhoon’s center and d-excess values increased.The water vapor sources were primarily from moist maritime air mass.At stage one of TP precipitation theδ18O was relatively heavy,the water vapor mixed local evaporation water vapor and was influenced by external circulation of the typhoon.The TP precipitation at stage two and WL precipitation were affected by the single water vapor mass andδ18O value gradually decreased.The distance between HN and the typhoon center was similar to that between NT and typhoon center,and the two cities had the same water vapor source,so that their precipitationδ18O fluctuations were close to each other.

关 键 词：台风“灿鸿” 降水 稳定同位素 过量氘 水汽源 

分 类 号：P339[天文地球—水文科学]