Relationships between δ18O in precipitation and air temperature and moisture origin on a south-north transect of the Tibetan Plateau
Relationships between δ18O in precipitation and air temperature and moisture origin on a south-north transect of the Tibetan Plateau
复制标题
青藏高原南北横断面降水δ18O与气温和水分成因的关系
DOI：
10.1016/j.atmosres.2007.08.004
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发表时间：
2008-02
影响因子：
5.5
通讯作者：
中科院分区：
文献类型：
--
作者：
该项目收集并分析了2000 - 2003年青藏高原南北向的样带（南起拉萨，中至那曲、沱沱河，北至德令哈）沿着的降水样品。结果表明，总体上降水中δ 18O与气温的正相关性由南向北逐渐增强，季风活动逐渐减弱。特别是降水δ 18O值与1~5月气温（T）之间存在较好的线性关系。另外，在气温较低的情况下，整个青藏高原降水中δ 18O值的变化主要受温度效应的控制。研究结果还表明，T-δ 18 O的影响在样带的沿着全年都很重要，即使在夏季水汽主要来自季风活动的南方也是如此。降水中稳定氧同位素的变化沿着样带，特别是南部的变化，可以反映藏南冰芯中δ 18 O记录的长期变化。而夏季季风活动和凝结温度与地温的巨大差异则减弱了青藏高原中南部降水中δ 18 O-T的相关性。降水中稳定氧同位素的变化可以揭示藏南冰芯δ 18 O记录的短期变化。与前人研究结果相比，该样带2000 - 2003年降水中δ 18 O-T的相关性较1991 - 1999年差。这可能是由于2000 - 2003年的年平均降水量较1991 - 1999年偏高，季风活动有增强的趋势。
This project collected and analyzed precipitation samples along a south to north transect of the Tibetan Plateau, from Lhasa in the south, Nagqu and Tuotuohe in the middle, to Delingha in the north, from 2000 to 2003. Results show that overall the positive correlation between δ18O in precipitation and temperature gradually strengthens from south to north, with gradual weakening of monsoon activity. In particular, good linear relationships exist between δ18O values of precipitation and air temperatures (T) at all the four stations from January to May over the years. In addition, our data show that when air temperature is low enough, the variations of δ18O values in precipitation over the whole Tibetan Plateau are controlled mainly by temperature effects. Our data also show that T–δ18O effects are of importance throughout the year along the transect, even in the south where the summer moisture mainly comes from monsoon activities. The stable oxygen isotope variations in precipitation along the transect, especially in the south, can reveal the long-term changes of δ18O records in the south Tibetan ice cores. In summer, however, the monsoon activities and the great difference between the condensation temperature and the ground temperature weaken the δ18O–T correlation in precipitation in the south and middle part of Tibetan Plateau. The stable oxygen isotope variations in precipitation can reveal the short-term changes of δ18O records in the south Tibetan ice cores. Compared with the results from previous studies, the δ18O–T correlations in precipitation in 2000–2003 on this transect are poorer than the ones reported from 1991–1999. This may result from higher average annual precipitation and the increasing trend of the monsoon activities in 2000–2003 compare to those in 1991–1999.
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影响因子：
56.9
作者：
L. Thompson;T. Yao;M. E. Davis;K. Henderson;E. Mosley‐Thompson;P. Lin;J. Beer;H. Synal;
通讯作者：
L. Thompson;T. Yao;M. E. Davis;K. Henderson;E. Mosley‐Thompson;P. Lin;J. Beer;H. Synal;
影响因子：
3.1
作者：
K. Shichang;Q. Dahe;P. Mayewski;C. Wake;Ren Jiawen
通讯作者：
K. Shichang;Q. Dahe;P. Mayewski;C. Wake;Ren Jiawen
影响因子：
--
作者：
L. Tian;T. Yao;P. Schuster;J. White;K. Ichiyanagi;E. Pendall;J. Pu;Winston H. Yu
通讯作者：
L. Tian;T. Yao;P. Schuster;J. White;K. Ichiyanagi;E. Pendall;J. Pu;Winston H. Yu
影响因子：
3.1
作者：
L. Tian;T. Yao;A. Numaguti;Weizheng Sun
通讯作者：
L. Tian;T. Yao;A. Numaguti;Weizheng Sun
DOI：
10.3402/tellusb.v47i5.16077
发表时间：
1995-11
期刊：
Tellus B
影响因子：
--
作者：
S. Johnsen;D. Dahl-Jensen;W. Dansgaard;N. Gundestrup
通讯作者：
S. Johnsen;D. Dahl-Jensen;W. Dansgaard;N. Gundestrup