热带地理

热带地理 ›› 2018, Vol. 38 ›› Issue (5): 651-659.doi: 10.13284/j.cnki.rddl.003066

• 论文 • 上一篇    下一篇

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

孙晓双1，崔梦月1，洪 晖1，王晓艳1，董进国3，雷国良1,2，姜修洋1,2   

  1. （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）
  • 出版日期:2018-09-05 发布日期:2018-09-05
  • 作者简介:孙晓双（1991―），男，山东济南人，硕士研究生，主要研究方向为自然地理学，（E-mail）sxsfjsd00@163.com。
  • 基金资助:

    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

Change and Influencing Factors of δ18O in the Precipitation of Typhoon “CHAN-HOM” at Eastern Coastal Cities in China

SUN Xiaoshuang1，CUI Mengyue1，HONG Hui1，WANG Xiaoyan1， DONG Jinguo3，LEI Guoliang1,2，JIANG Xiuyang1,2   

  1. （1．Collegeof Geographical Sciences，Fujian Normal University，Key Laboratory of Humid Subtropical Eco-geographical Process， Ministry of Education，Fuzhou 350007，China；2．Institute of Geography，Fujian Normal University，Fuzhou 350007，China； 3．School of Geographic Science，Nantong University，Nantong 226000，China）
  • Online:2018-09-05 Published:2018-09-05

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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δ18O平均值为-4.40‰，为最高值；温岭降水δ18O的平均值最低，为-9.80‰；海宁与南通降水的δ18O平均值居于两者之间，分别为-8.83‰和-7.88‰。4地降水δ18O均呈现出2个阶段的“厂”型变化特征。“灿鸿”降水δ18O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δ18O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，δ18O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δ18O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δ18O值波动比较接近。

关键词: 台风“灿鸿”, 降水, 稳定同位素, 过量氘, 水汽源

Abstract:

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 of δ18O in the “CHAN-HOM” precipitation at TP was -4.40‰, which was the highest value. The lowest value of δ18O precipitation was -9.80‰ at WL. The average values of δ18O precipitation at HN and NT were -8.83‰ and -7.88‰, respectively, which were between those of TP and WL. The pattern of precipitation δ18O at the four sites expressed negative and gradually stable. The rainout effect of precipitation δ18O was obvious. Isotope ratios reveal that the precipitation δ18O 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 the δ18O 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 and δ18O 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 precipitation δ18O fluctuations were close to each other.

Key words: typhoon CHAN-HOM, precipitation, stable isotopic, d-excess, water vapor source