水汽来源和环境因子对典型亚热带季风区降水稳定同位素的影响——以湖口地区为例  

Effects of Moisture Sources and Environmental Factors on Precipitation Stable Isotopes in a Typical Subtropical Monsoon Region:A Case of Hukou Region

作　　者：吴华武[1] 欧阳勇峰 姜鹏举 张剑明[4] 李静 吴亚坤 Wu Huawu;Ouyang Yongfeng;Jiang Pengju;Zhang Jianming;Li Jing;Wu Yakun(Key Laboratory of Watershed Geographic Sciences,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,Jiangsu,China;Jiangxi Urban-rural Planning and Municipal Design and Research Institute Co.Ltd.,Nanchang 330224,Jiangxi,China;College of Foresty,Henan Agriculture University,Zhengzhou 450002,Henan,China;Hunan Provincial Climate Center,Changsha 410118,Hunan,China;School of Geographic Information and Tourism,Chuzhou University,Chuzhou 239000,Anhui,China;Department of Environmental Engineering/School of Energy&Environment,Anhui University of Technology,Ma'anshan 243002,Anhui,China)

机构地区：[1]中国科学院南京地理与湖泊研究所/中国科学院流域地理学重点实验室,江苏南京210008 [2]江西省城乡规划市政设计研究总院有限公司,江西南昌330224 [3]河南农业大学林学院,河南郑州450002 [4]湖南省气候中心,湖南长沙410118 [5]滁州学院地理信息与旅游学院,安徽滁州239000 [6]安徽工业大学能源与环境学院,安徽马鞍山243002

出　　处：《地理科学》2022年第8期1502-1512,共11页Scientia Geographica Sinica

基　　金：国家自然科学基金项目(42071145,41861022,41701036);滁州学院引进人才启动基金项目(2022qd001);安徽高校人文社会科学研究重点项目(SK2021A0687);中国科学院流域地理学重点实验室开放基金(WSGS2020003)资助。

摘　　要：基于亚热带季风区湖口降水稳定同位素进行高频监测,利用HYSPLIT模型、潜在源贡献因子算法和质量浓度权重轨迹等方法对湖口区降水水汽来源进行分析,研究结果表明:①湖口地区大气降水同位素组成呈夏季低、春冬季高变化趋势,湖口地区大气降水线斜率(8.19)和截距(12.5)与全球大气水线较为接近,说明整体上该研究区气候环境相对湿润。②湖口降水同位素组成与降水量、湿度和温度均成显著负相关关系,这表明其具有显著的降水量效应、湿度效应和反温度效应。③湖口地区水汽来源主要受东南沿海内陆地区、南海和孟加拉湾源区水汽影响显著,其造成降水同位素值也明显偏小,尤其在夏季和秋季。④湖口地区降水同位素组成变化还受锋面天气系统(准静止锋和冷锋)和台风影响,台风降水的水汽来源主要来自中国南海和东海地区,此水汽往内陆输送过程中不断形成降水,此过程中降水重同位素(18O和2 H)不断被冲刷造成其值逐渐变小;受准静止锋面系统影响降水δ^(18)O值为极小值,这与锋面系统中冷、暖气团相遇造成强烈空气对流活动密切相关;而在冷锋面系统影响下,湖口地区降水δ^(18)O值和d-excess较大,这与中国南方内陆局地再循环水汽补充有关,该研究结果将为鄱阳湖流域大气环流和水循环过程研究提供科学依据和数据支撑。To improve the understanding the water cycle of subtropical monsoon region,stable isotopes in precipitation were monitored in the Hukou region.The precipitating moisture sources were identified in this region using the HYSPLIT model,PSCF,and CWT methods.Results showed that isotopic composition in precipitation was obviously depleted in summer and enriched in spring and winter.The slope(8.19)and intercept(12.5)of the meteoric water line in Hukou region were higher than those of the global meteoric water line,which suggested the climate environment in the study area was relatively humid.The variations of precipitation isotopes had significant precipitation effect,humidity effect,and anti-temperature effect.The moisture sources in the study region were mainly from the southeast coastal inland areas,China South Sea,and Bay of Bengal,resulting in the lower isotopic values in summer and autumn.Moreover,stable isotopic compositions in precipitation were influenced by frontal weather systems such as quasi-stationary front and cold front and typhoon.The water vapor that formed typhoon precipitation mainly came from the South China Sea and the East China Sea.During the process of water vapor transportation to the inland,the precipitation isotopes were continuously washed away,and the isotopic values decreased gradually.Under the influence of the quasi-static front,precipitation isotopic value was the minimum,which may be caused by the strong convection between the cold and warm air masses in the front system.In addition,theδ^(18)O and d-excess of the precipitation influenced by the cold front system were relatively higher in the Hukou area,which may be related to the local water vapor replenishment from the inland regions.

关 键 词：降水稳定同位素 水汽来源 台风降水 HYSPLIT模型 鄱阳湖流域 

分 类 号：P426.2[天文地球—大气科学及气象学]