洞庭湖流域降水同位素与ENSO关系研究

发布时间：2018-03-05 06:31

本文选题：洞庭湖流域　切入点：降水同位素　出处：《地理科学》2017年05期 　论文类型：期刊论文

【摘要】：基于洞庭湖流域内长沙市2010年1月至2012年12月降水事件、GNIP(Global Network for Isotopes in Precipitation)长沙站1988~1992年月降水同位素资料及ENSO(厄尔尼诺/拉尼娜和南方涛动)的2个常用指标(南方涛动指数SOI和Nino3区海面温度SST),分析了流域降水同位素与ENSO关系。结果表明:洞庭湖流域降水中δ~(18)O与降水量、气温在日、月尺度上均呈负相关且只有月度上与降水量的负相关不显著。洞庭湖流域降水中δ~(18)O与ENSO的SST指标则呈显著正相关。ENSO对洞庭湖流域降水同位素的影响机制可能如下:春季,La Nina年源自西太平洋的东南风强盛,其转向为西南风的区域达到印度洋,而El Nino年,东南风转向为西南风的发生区域位于印度洋以东,前者有利于挟带印度洋远源水汽向中国东部区域输送,进而造成降水同位素的贫化;夏季,La Nina年印度洋水汽输送在中国南海转为经向继而向北延伸,而El Nino年,源自印度洋的水汽沿纬向穿过南海,在东海转向往北延伸,后者有利于挟带西太平洋的近源水汽输送到中国东部季风区,进而引起降水同位素的富集。
[Abstract]:Based on the precipitation events in Changsha from January 2010 to December 2012 in Changsha Lake Basin, the isotopic data of monthly precipitation from 1988 to 1992 at Changsha Station and two commonly used indexes (Southern Oscillation) of ENSO (El Nino / La Nina and Southern Oscillation). The relationship between precipitation isotopes and ENSO in the dynamic index SOI and Nino3 area is analyzed. The results show that 未 ~ (18) O and precipitation in Dongting Lake basin are studied. The temperature is in the day, In Dongting Lake basin, there is a significant positive correlation between 未 ~ (18) O and ENSO's SST index. The mechanism of influence of ENSO on precipitation isotopes in Dongting Lake basin may be as follows. Spring La Nina is a strong southeasterly wind from the western Pacific Ocean. In the year of El Nino, the southeasterly wind turned to be located in the eastern part of the Indian Ocean. The former was favorable for the transport of water vapor from the far Indian Ocean to the eastern part of China. In summer, the Indian Ocean vapor transport in the South China Sea became meridional and then extended northward, while in El Nino, the water vapor from the Indian Ocean passed through the South China Sea along the zonal direction, and then to the north in the East China Sea. The latter is conducive to the transport of water vapor from the western Pacific to the eastern monsoon region of China, which leads to the enrichment of precipitation isotopes.
【作者单位】：中国科学院地理科学与资源研究所陆地水循环及地表过程重点实验室;衡阳师范学院城市与旅游学院;湖南师范大学资源与环境科学学院;
【基金】：国家自然科学基金项目(41401019)资助~~
【分类号】：P426.612;P732

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