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基于收集2014年8月至2015年8月上海70个降水样品,分析上海降水同位素特征与温度、降水量的相关关系,分析不同时间尺度下降水中δ~(18)O、氘盈余与ENSO事件的联系.结果表明上海地区大气降水中δD与δ~(18)O冬春较高,夏秋较低.上海大气降水线方程截距和斜率比全球降水线方程偏小,可能是因为降水过程中受到不平衡的二次蒸发.在不同的时间尺度下,上海地区降水中δ~(18)O与气温和降水量具有不同的相关关系,冬季存在着较弱的温度效应,而全年呈现出较显著的降水量效应,受大气环流过程影响明显.取样期间,降水中δ~(18)O与d值(过量氘)清晰记录了La Ni1a向El Ni1o之间的过渡,拉尼娜期间,降水中δ~(18)O与d值偏负;El Ni1o期间,δ~(18)O与d值偏正.
Based on the collection of 70 precipitation samples in Shanghai from August 2014 to August 2015, the correlations between precipitation isotopes in Shanghai and temperature and precipitation were analyzed, and δ 18 O, deuterium surpluses and ENSO events in precipitation at different time scales were analyzed The results show that δD and δ ~ (18) O in winter and spring in Shanghai are higher than those in summer and autumn, and the intercept and slope of atmospheric precipitation in Shanghai are smaller than the global precipitation equation, probably because of the precipitation Unbalanced secondary evaporation.Under different time scales, the δ 18 O in precipitation in Shanghai has a different correlation with temperature and precipitation, but there is a weak temperature effect in winter, Significant precipitation effect was significantly affected by the atmospheric circulation process.During the sampling period, δ 18 O and d (excess deuterium) in precipitation clearly recorded the transition between La Ni1a and El Ni1o, while in La Nina, the δ ~ (18) O and d values are negatively negative; δ ~ (18) O and d values are positive during El Ni1o.