西藏雅鲁藏布江中、下游地区大气降水同位素分布特征

CHARACTERISTICS OF ISOTOPE DISTRIBUTION IN PRECIPITATION IN THE MIDDLE-LOWER REACHES OF YARLUNG ZANGBO RIVER

雅鲁藏布江中、下游地区的雨水方程为 :δD =7.54δ18O +1 5.92 ,表现出该地区为强烈蒸发特征。氢、氧同位素空间分布特征 :δD、δ18O东部高 ,西部低 ;氚值 (T)东部低 ,西部高 ,这与孟加拉湾降水云气的形成、动态运移过程及青藏高原的自然环境、气候条件有关。

The precipitation equation is δD=7.54δ\+\{18\}O+15.92, showing a characteristic of intense vaporization in the Middle\|Lower reaches of the Yarlung Zangbo River. The spatial distribution of hydrogen and oxygen isotopes: δD and δ\{\}\+\{18\}O values are higher in the east than in the west, but the opposite case is for T values. The distribution features are related with the precipitation origin over the Bengal Bay and the dynamic movement, environment and climate conditions in the Qinghai\|Xizang Plateau. \;