| 上海降水中氢氧同位素特征及与ENSO的关系 |
| 摘要点击 3734 全文点击 1519 投稿时间：2016-09-19 修订日期：2016-11-25 |
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| 中文关键词 上海 稳定同位素 ENSO 大气环流 δ18O δD |
| 英文关键词 Shanghai stable isotope ENSO atmospheric circulation δ18O δD |
| 作者 | 单位 | E-mail | | 董小芳 | 华东师范大学地理科学学院, 地理信息科学教育部重点实验室, 上海 200241 | 15802197306@163.com | | 邓黄月 | 华东师范大学地理科学学院, 地理信息科学教育部重点实验室, 上海 200241 | | | 张峦 | 华东师范大学地理科学学院, 地理信息科学教育部重点实验室, 上海 200241 | | | 朱志鹏 | 华东师范大学地理科学学院, 地理信息科学教育部重点实验室, 上海 200241 | | | 王琳 | 华东师范大学地理科学学院, 地理信息科学教育部重点实验室, 上海 200241 | | | 郑祥民 | 华东师范大学地理科学学院, 地理信息科学教育部重点实验室, 上海 200241 | | | 周立旻 | 华东师范大学地理科学学院, 地理信息科学教育部重点实验室, 上海 200241 | lmzhou@geo.ecnu.edu.cn |
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| 中文摘要 |
| 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δ18O、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δ18O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δ18O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δ18O与d值（过量氘）清晰记录了La Niña向El Niño之间的过渡，拉尼娜期间，降水中δ18O与d值偏负；El Niño期间，δ18O与d值偏正. |
| 英文摘要 |
| A total of 70 precipitation samples were collected from August 2014 to August 2015 in Shanghai and the oxygen and hydrogen isotope of precipitation were analyzed. The relationship between the δ18O and deuterium excess of precipitation and ENSO events was addressed. The results showed that δD and δ18O of precipitation in Shanghai were higher in winter and spring than in summer and fall. The slope of meteoric water line with these data was a little smaller than the global meteoric water line. The main reason could be the unbalanced secondary evaporation in the process of precipitation. The correlation between the δ18O in precipitation and temperature and precipitation varied in different time scales. On a seasonal scale, this work revealed that there was no significant temperature effect in winter, but significant precipitation effect was found in the annual scales, which was obviously affected by the atmospheric circulation. δ18O values and deuterium excess in precipitation recorded the La Niña and El Niño conversion process. During the La Niña event, the δ18O and d values were more negative than those in the El Niño event. |
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