地理科学 ›› 2007, Vol. 27 ›› Issue (5): 718-723.doi: 10.13249/j.cnki.sgs.2007.05.718

• 论文 • 上一篇    下一篇

青藏高原纳木错流域夏、秋季大气降水中δ18O与水汽来源及温度的关系

徐彦伟1, 康世昌1,2, 周石硚1, 丛志远1, 迟妍妍3, 张强弓1   

  1. 1. 中国科学院纳木错圈层相互相用综合观测研究站 中国科学院青藏高原研究所 北京 100085;
    2. 中国科学院冰冻圈科学国家重点实验室 甘肃 兰州 730000;
    3. 中国环境科学研究院 北京 100012
  • 收稿日期:2006-06-21 修回日期:2006-10-09 出版日期:2007-09-20 发布日期:2007-09-20
  • 基金资助:
    国家自然科学基金(40401054,40121101,40671045);中国科学院“百人计划”和院长基金项目;中国科学院知识创新工程项目(KZCX3-SW-339);“973”项目(2005CB422004)资助

Variations of δ18O in Summer and Autumn Precipitation and Their Relationships with Moisture Source and Air Temperature in Nam Lake Basin,Tibet Plateau

XU Yan-Wei1, KANG Shi-Chang1,2, ZHOU Shi-Qiao1, CONG Zhi-Yuan1, CHI Yan-Yan3, ZHANG Qiang-Gong1   

  1. 1. Nam Co Comprehensive Observation and Research Station, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085;
    2. Joint Key Laboratory of Cryosphere and Environment, Chinese Academy of Sciences, Lanzhou, Gansu 730000;
    3. Chinese Research Academy of Environmental Sciences, Beijing 100012
  • Received:2006-06-21 Revised:2006-10-09 Online:2007-09-20 Published:2007-09-20

摘要: 根据2005年8~10月在纳木错收集的降水样和相关气象观测,分析该地区降水中δ18O变化特征及其与水汽来源关系,揭示不同水汽来源降水中δ18O与温度之间关系。观测期间水汽来源以西南季风和青藏高原本地气团输送为主。结果表明,纳木错流域夏、秋季节历次降水中δ18O变化主导因素是水汽来源不同。远距离输送夏季风海洋性气团形成的降水1δ8O值较低,而局地大陆性气团降水δ18O较高。对同源的降水事件,气温和δ18O值有一定正相关性,因而可能是次一级的响因素。

Abstract: Precipitation samples were collected at Nam Co Comprehensive Observation and Research Station,Tibet Plateau,during August to October of 2005.Relationships between δ18O in precipitation and moisture source are analyzed by using air mass backward trajectories.Difference of moisture source is the primary factor which influences variations of δ18O.While more negative δ18O values occur in precipitation which is caused by moisture originating mainly from Indian Ocean and transported by summer Southwest Monsoon,less negative δ18O values are associated with precipitation by local moistures and westerlies.According to the air mass backward trajectories,precipitation events are divided into two types: continental and marine precipitation.Positive correlations exist between δ18O and air temperature for both types of precipitation events,suggesting secondary affects of temperature on precipitation δ18O.

中图分类号: 

  • P343.6