【摘要】 根据青藏高原西部阿里地区狮泉河气象站和改则气象站取得的降水水样和降水气象资料,分析了该区域降水中δ18O的变化特征.结果表明:在长时间尺度上,狮泉河和改则两站点历次降水中δ18O和气温之间都有较好的正相关,尤其是降水中月平均δ18O与月平均降水温度之间相关性更加显著,降水中δ18O主要受"温度效应"的影响.而在其中的某一年,这种相关性不是很明显,而且在降水中δ18O和降水时温度之间的相关性很好的年份,在7月底或8月份初短期内降水中δ18O几乎都有一个突然降低的事件,这可能与印度季风水汽输送有关.与狮泉河站相比,在改则降水中δ18O和气温二者之间这种相关性相对较弱,这与改则当地内陆水循环特别是强烈蒸发引起的降水有关.更多还原

【Abstract】 In this paper the variation of stable isotope in precipitation is correlated to the meteorological data at Shiquanhe and Gêrzê Stations in the western Tibetan Plateau. It is found that there is a good linear relation between {δ~{18}O} in precipitation and temperature at Shiquanhe and Gêrzê Stations, especially the relationship of monthly-averaged {δ~{18}O} and monthly-averaged temperature is more significant. Accordingly, it can be concluded that {δ~{18}O} in precipitation was controlled by temperature effect in this area. However, in some single year this relation is not very good, even if in the years when {δ~{18}O} is related with temperature, it was found that {δ~{18}O} in precipitation decreased abruptly at the end of July or early August. This variation of stable isotope may be affected by the monsoon that brings on the oceanic moisture from the Indian Ocean. The relationship between {δ~{18}O} in precipitation and temperature at Gêrzê Station is not as good as that one at Shiquanhe Station, which was mainly due to the impact of continental water recycling especially local evaporation.更多还原