Precipitation stable isotope records from the northern Hengduan Mountains in China capture signals of the winter India-Burma Trough and the Indian Summer Monsoon
Precipitation stable isotope records from the northern Hengduan Mountains in China capture signals of the winter India-Burma Trough and the Indian Summer Monsoon
复制标题
中国横断山脉北部降水稳定同位素记录捕捉到冬季印缅海槽和印度夏季风的信号
DOI：
10.1016/j.epsl.2017.08.018
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发表时间：
2017
影响因子：
5.3
通讯作者：
Qu Dongmei
中科院分区：
文献类型：
--
作者：
Yu Wusheng;Tian Lide;Yao T;ong;Xu Baiqing;Wei Feili;Ma Yaoming;Zhu Haifeng;Luo Lun;Qu Dongmei
结果表明，昌都地区降水稳定同位素在不同季节的波动揭示了不同的水分来源。季风前和季风后以西风带和局地再循环水汽为主，降水稳定同位素和温度变化趋势相似。冬季印缅槽结合对流向横断山脉北部输送海相水汽。因此，在随后的降水中，稳定同位素偶尔会突然减少。季风期昌都降水δ 18o和δ D值较低，且持续时间较长，主要受印度夏季风和对流增强的影响。研究结果表明，在解释横断山区树木年轮和冰芯记录时，需要考虑包括冬季印缅槽和印度夏季风在内的各种气候系统引起的季节性降水差异的影响。
This project reports results of the first precipitation stable isotope (δ 18 O and δ D) time series produced for Qamdo in the northern Hengduan Mountains in the southeastern Tibetan Plateau. The data showed that the fluctuations of precipitation stable isotopes at Qamdo during the different seasons revealed various moisture sources. The westerlies and local recycling moisture dominated at the study area before the pre-monsoon and after the post-monsoon seasons, which resulted in similar trends of both precipitation stable isotopes and temperature. The marine moisture was transported to the northern Hengduan Mountains by the winter India–Burma Trough combined with convection. Consequently, stable isotopes in subsequent precipitation were occasionally observed to decrease suddenly. However, δ 18 O and δ D values of precipitation at Qamdo were lower during the monsoon period and the duration of those low values was longer because of the effects of the Indian Summer Monsoon and the strengthening convection. Our findings indicate that the effects of seasonal precipitation differences caused by various climate systems, including the winter India–Burma Trough and Indian Summer Monsoon, need to be considered when attempting to interpret tree-ring and ice core records for the Hengduan Mountains.