收稿日期: 2007-03-19
修回日期: 2007-06-27
网络出版日期: 2007-08-10
基金资助
国家自然科学基金项目“青藏高原大气水汽中稳定同位素与水汽输送过程研究”（编号：40671043）；国家重点基础研究发展计划项目“青藏高原环境变化及其对全球变化的响应与适应对策”(编号：2005CB422002)；国家自然科学基金创新群体科学基金项目“冰芯与寒区环境”（编号：40121101）资助.
Influence of Moisture Transport on Stable Isotope in Precipitation
Received date: 2007-03-19
Revised date: 2007-06-27
Online published: 2007-08-10
利用NCEP/NCAR全球大气再分析格点资料和2005年西藏雅鲁藏布江流域4个站点（拉孜、奴各沙、羊村和奴下）降水中δ18O数据，分析了雅鲁藏布江流域降水中δ18O变化同水汽输送通量的关系。从空间上来看，雅鲁藏布江流域降水中δ18O同水汽输送通量呈明显的正相关，从下游至上游，随着水汽输送通量的减少，降水中的δ18O逐渐降低；从时间上来看，春季水汽通量较小，降水中的δ18O较高，而在夏季，水汽通量大，降水中的δ18O较低。在此基础上，又利用NCEP/NCAR气象数据建立水汽追踪模型，以羊村站为例对雅鲁藏布江流域降水的水汽输送过程进行了追踪模拟，并讨论了降水中δ18O变化同水汽源地以及输送过程的关系。结果发现，在季风降水之前的春季，降水中较高的δ18O主要受西风带水汽输送以及当地蒸发水汽的影响；在季风期间，降水中较低的δ18O主要受来自印度洋暖湿水汽输送的影响。
巩同梁 , 刘忠方 , 姚檀栋 , 尹常亮 , 田立德 . 水汽输送对雅鲁藏布江流域降水中稳定同位素的影响[J]. 地球科学进展, 2007 , 22(8) : 842 -850 . DOI: 10.11867/j.issn.1001-8166.2007.08.0842
Relation between variation of δ18O in precipitation in Yarlungzangbo River basin and the moisture flux was analyzed with NCEP/NCAR reanalysis grid data and δ18O in precipitation at four stations ( Lazi, Nugesha, Yangcun and Nuxia ) of the region investigated. For the spatial variations, there is obviously positive correlation between them for the whole basin. With the decrease of moisture flux from the downstream to the upstream,δ18O in precipitation becomes lower gradually. However, for the temporal variations, higher δ18O in precipitation of spring is linked to small moisture flux and low δ18O in precipitation of summer is linked to large moisture flux. And then, a model involving meteorological data from NCEP/NCAR was established and successfully traced the moisture transport trajectories at Yangcun station. Based on the traced results and δ18O in precipitation at Yangcun station, the relation between δ18O in precipitation in Yarlungzangbo River basin and the moisture transport history was discussed. We found that humid marine air mass from the Indian Ocean in general had significantly lower δ18O values than continental air mass from north or local re-evaporation. The fluctuation of δ18O in precipitation during monsoon season is very pronounced and the lower values are usually related to far distance and multilayer of moisture transport, as well as moisture crossing the Himalaya Mountain.
Key words： δ18O; Moisture flux; Yarlungzangbo river basin.; Precipitation; Moisture transport
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