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通过分季节研究藏东南地区水体中氧同位素(δ18O)的变化,揭示了δ18O随海拔变化的特征,进而分析了相关的大气环流过程.研究结果表明,藏东南河水的δ18O和降水中δ18O的变化趋势一致;同时也表明,藏东南河水中δ18O随海拔的升高而降低的特征在不同时期有差异.季风期河水的δ18O值最低,其随高程递减的速率也最小.西风期河水的δ18O值也较低,仅次于季风降水期,随海拔递减的速率也较小.季风前河水中的18O最富集,且与海拔的负相关线性关系相对最不显著;而季风后河水中δ18O值随海拔变化的递减速率最大.河水的δ18O值在不同季节与高程效应的符合程度不同,反映了不同的河水补给的影响.需要说明的是,虽然不同季节的采样数目并不相同,但各自的δ18O-H线性相关系数都达到了0.05的置信度.因此,不同季节的河水δ18O的高程效应代表了氧同位素在大气环流和地表过程作用下的变化特征.
By analyzing the variation of δ18O in southeastern Tibet by sub-seasons and revealing the characteristics of δ18O variation with altitude, the related atmospheric circulation processes are analyzed.The results show that δ18O in southeastern Tibet and δ18O in precipitation are different The trend of δ18O value in the southeastern part of the river is also different from that in the other part of the study. Also lower than the monsoon precipitation period, with the decreasing rate of the altitude is also small.Pre-monsoon water 18O is the most abundant, and the negative correlation with the altitude is the most insignificant; and after monsoon water δ18O value The maximum rate of decline with altitude is the largest.The δ18O value of river water is different from the elevation effect in different seasons and reflects the impact of different river recharges.It should be noted that although the number of sampling in different seasons is not the same, δ18O-H linear correlation coefficient has reached a confidence level of 0.05 Therefore, the δ18O elevation effect of the river in different seasons represents the role of oxygen isotopes in the atmospheric circulation and surface processes Changes in.