自然资源学报 ›› 2014, Vol. 29 ›› Issue (6): 1043-1052.doi: 10.11849/zrzyxb.2014.06.012

• 资源评价 • 上一篇    下一篇

云南大气降水中δ18O与气象要素及水汽来源之间的关系

李广1, 章新平1, 吴华武1, 张剑明2, 魏乃琼1, 黄煌1   

  1. 1. 湖南师范大学资源与环境科学学院, 长沙 410081;
    2. 湖南省气候中心, 长沙 410007
  • 收稿日期:2013-06-28 修回日期:2013-11-04 发布日期:2014-06-24
  • 通讯作者: 章新平(1956-),男,博士,教授,主要从事气候变化及水文同位素的研究。E-mail:zxp@hunnu.edu.cn E-mail:zxp@hunnu.edu.cn
  • 作者简介:李广(1988-),男,湖南长沙人,硕士研究生,主要从事气候变化以及水文同位素方面的研究。E-mail:liguangda1988@163.com
  • 基金资助:

    国家自然科学基金项目(41171035);湖南省重点学科建设项目(2012001);湖南省研究生科研创新项目基金(CX2013B223).

Stable Oxygen Isotope in Precipitation in Relation to the Meteorological Factors and the Moisture Sources in Yunnan

LI Guang1, ZHANG Xin-ping1, WU Hua-wu1, ZHANG Jian-ming2, WEI Nai-qiong1, HUANG Huang1   

  1. 1. College of Resources and Environment Sciences, Hunan Normal University, Changsha 410081, China;
    2. Hunan Climate Center, Changsha 410007, China
  • Received:2013-06-28 Revised:2013-11-04 Published:2014-06-24

摘要:

根据云南昆明、腾冲、蒙自三个地区在2009 年1 月至2011 年12 月3 a 间收集的大气降水以及相关气象要素资料,结合欧洲中期数值预报中心以及NCEP/NCAR提供的再分析资料,研究了天气尺度下三个地区大气降水中δ18O与降水量、温度、水汽压等气象要素之间的关系,并分析了δ18O与高空各气压层(800、700、500、300 hPa)风速的相关关系。结果表明:在天气尺度下,三个地区大气降水中δ18O与降水量、温度、水汽压均存在显著的负相关,表明三个地区大气降水中δ18O的变化具有显著的降水量效应、反温度效应以及湿度效应;同时,高空各气压层风速与δ18O之间存在正相关关系,表明高空风速也是影响大气降水中δ18O变化的一个重要因素。通过拉格朗日后向轨迹模型HYSPLIT 4.8 追踪三个地区水汽输送轨迹发现,三个地区大气降水的水汽来源基本一致,表明三地处在同一条水汽通道上。在湿季降水期间(5—9 月),水汽主要来源于孟加拉湾、阿拉伯海以及南海等海域,降水中δ18O偏低;而在干季降水期间(10 月—翌年4月),水汽主要来源于西风带携带的内陆水汽以及局地水汽再循环,降水中δ18O偏高。

关键词: 大气降水, δ18O, 水汽来源, 云南, 气象要素

Abstract:

Based on the data of precipitation samples and meteorological facters from Jan. 2009 to Dec. 2011 in Kunming, Tengchong and Mengzi of Yunnan Province. In combination with the data of the European Centre for Medium-range Weather Forecasts and the NCEP/NCAR, the relationships between the δ18O in precipitation and the precipitation amount, temperature and air pressure on the synoptic timescale were analyzed of the three stations. We also analyzed the relationships between the δ18O in precipitation and the wind speed of different heights. The results indicated that under the synoptic timescales, there was significant negative correlation between the δ18O in precipitation and the precipitation amount, temperature and air pressure. It suggested that the variations of the δ18O in precipitation had significant precipitation amount effect, anti-temperature effect and humidity effect. At the same time, there was significant positive correlation between the δ18O in precipitation and the different heights wind speed, this indicated that the wind speed of different heights was also an important factor in changing the δ18O in precipitation at some way. Taking advantage of the HYSPLIT 4.8 to track the trajectory of moisture sources in Kunming, Tengchong and Mengzi, we found that the moisture sources at the three stations were the same, the result indicated that the three stations were in the same water vapour channel. During the wet seasons (May-September), the moisture sources mainly came from the Bay of Bengal, the Arabin Sea and the South China Sea. However, the δ18O in precipitation during the wet seasons was lower. During the dry seasons (October-next April), the moisture sources maily came from westerly wind belt carried the inland water vapour and the local water vapour circulation. The δ18O in precipitation during the dry seasons was higher.

Key words: precipitation, δ18O, moisture, Yunnan Province, meteorological facters

中图分类号: 

  • P426.61+2