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根据2012年1月至2017年2月上海206个降水样品实测数据,结合全球大气降水同位素网络(GNIP)提供的南京、武汉、福州、香港1961~2012年大气降水同位素数据分析不同强弱程度的ENSO事件对降水中同位素组成影响的差异性.研究时段内上海降水中δD与δ~(18)O夏秋为低值,冬春为高值.El Nino事件期间大气降水线的斜率与截距均大于非El Nino事件期间,La Nina事件期间反温度效应、降水量效应、水汽压效应较非La Nina事件期间显著.不同强弱程度的El Nino和La Nina事件影响下的上海降水中δ~(18)O、d值与海洋尼诺指数(ONI)、海表温度距平值(SSTA)、ONI极值、累积值ΣONI这4个指数具有明显的负相关关系,并且降水中δ~(18)O与ONI、SSTA两个指数相关性大小受ENSO事件的影响较大.
Based on the data collected from 206 precipitation samples in Shanghai from January 2012 to February 2017 and the isotope data of atmospheric precipitation from 1961 to 2012 in Nanjing, Wuhan, Fuzhou and Hong Kong provided by Global Atmospheric Precipitation Isotope Network (GNIP) Differences of ENSO events on isotopic composition of precipitation During the study period, δD and δ ~ (18) O in summer and autumn in Shanghai were both low and winter and spring were high, and the slope and intercept Over the non-El Nino event, anti-temperature effect, precipitation effect and vapor pressure effect during La Nina event are more significant than those during La Nina event.During the El Niño and La Nina events, 18) The O and d values have obvious negative correlation with the ONI, SSTA, ONI, and ΣONI, and the δ 18 in precipitation ) The correlation between O and ONI and SSTA is more affected by ENSO events.