台风“玛莉亚”期间福州、将乐降水^(δ1)8O变化特征及影响因素  

The characteristics and influence factors of typhoon “Maria” induced rainfall δ^(18)O at Fuzhou and Jiangle

作　　者：蔡健榕 许涛 杨云月 姜修洋[1] CAI Jianrong;XU Tao;YANG Yunyue;JIANG Xiuyang(Key Laboratory for Humid Subtropical Eco-Geographical Processes of the Ministry of Education,School of Geographical Sciences,Fujian Normal University,Fuzhou 350007,China;School of Geography and Ocean Science,Nanjing University,Nanjing 210023,China)

机构地区：[1]湿润亚热带生态-地理过程教育部重点实验室,福建师范大学地理科学学院,福州350007 [2]南京大学地理与海洋科学学院,南京210023

出　　处：《地球环境学报》2021年第1期93-103,共11页Journal of Earth Environment

基　　金：国家自然科学基金项目(41672170)。

摘　　要：基于2018年第8号台风“玛莉亚”登陆前后福州、将乐两地小时分辨率的降水同位素数据,结合气象资料,分析了此次台风期间两地的降水^(δ)18O变化特征及影响因素。台风“玛莉亚”影响期间,福州降水^(δ)18O值变化范围为−2.72‰—−10.52‰,振幅达7.80‰,平均值为−8.42‰,呈现倒U型的三阶段变化特征,阶段1、3降水^(δ)18O值相对偏正,受蒸发效应影响显著;阶段2降水^(δ)18O值显著偏负,平均值为−8.95‰,远低于福州夏季多年降水^(δ)18O平均值−6.53‰。将乐降水^(δ)18O值变化范围为−1.70‰—−11.93‰,振幅为10.23‰,平均值为−10.06‰,呈现“厂”字型的两阶段变化特征,阶段1降水^(δ)18O值相对偏正,变化范围为−1.70‰—−7.54‰;阶段2降水^(δ)18O值显著偏负,平均值为−10.66‰。台风期间,两地阶段2的降水^(δ)18O值受“云雨区效应”的影响显著偏负。随着台风登陆并向内陆移动,受同位素瑞利分馏及地形的影响,内陆将乐^(δ)18O值进一步偏负。水汽输送通量分析表明,此次台风影响期间水汽主要来源于西北太平洋、印度洋和南海通道。Background,aim,and scope Hydrogen and oxygen stable isotopes in atmospheric precipitation are often used in hydrological cycles and paleoclimatic reconstruction studies for their high sensibility to environmental changes.Typhoon precipitation has a large contribution rate to precipitation in southeastern China.However,the influence of typhoons often lasts only 1 to 2 days,and the existing monthly and daily precipitation data are not suitable for in-depth study of the internal variation characteristics of stable isotopes of typhoon precipitation.In addition,when the typhoon landed on the southeast coast and moved inland,with the weakening of the typhoon energy,the precipitation weakened and mixed with local water vapor,making the inland precipitation δ^(18)O more complicated.Based on the meteorological data and stable isotope compositions in precipitation of No.8 typhoon "Maria" at Fuzhou and Jiangle,the characteristics of stable isotope compositions in precipitation of typhoon "Maria" and its influence factors have been analyzed.This has important implications for understanding the mechanism of typhoon impact on regional rainfall stable isotopes.Materials and methods Basedon the meteorological data and stable isotope compositions in precipitation of No.8 typhoon "Maria" in 2018 at Fuzhou and Jiangle,combined with the HYSPLIT model to simulate the source trajectory of water vapor,the mechanism of the influence of typhoon movement on the stable isotope of regional precipitation is explored.Results The results show that:(1) the local meteoric water line,established as:δ2H=7.30δ^(18)O - 3.51 (R2=0.95,N=13,Fuzhou);δ2H=6.93δ^(18)O - 4.37 (R2=0.99,N=17,Jiangle).(2) During the period of typhoon "Maria",the variation of precipitation δ^(18)O in Fuzhou is characterized by three stages,which exhibiting a reversed U-shaped pattern.The precipitation δ^(18)O in stage one and three are relative positive,while in the second stage is relative negative which is far below the average value of summer precipitation δ^(18)O in

关 键 词：台风“玛莉亚” 降水 稳定同位素 水汽源 云雨区效应 

分 类 号：P426.614[天文地球—大气科学及气象学]