Wen Yan-Ru, Wang Jian-Li
School of Geographic Sciences, Southwest University, Chongqing 404100, China.
Huan Jing Ke Xue. 2016 Jul 8;37(7):2462-2469. doi: 10.13227/j.hjkx.2016.07.007.
Variations of hydrogen and oxygen in stable isotopes and deuterium excess in precipitation as well as their relationship with precipitation,temperature and ENSO (El Niño/La Niño-Southern Oscilation) were analyzed by using 100 daily precipitation stable isotope data from April to October, 2015. The result showed that:① The equation of local meteoric water line (LMWL) was established:δD=8.28δO+12.34, the intercept and slope of which were greater than the global meteoric water 1ine (GMWL) but was similar to most of the southern China monsoon region.② Both stable isotopes and deuterium excess in precipitation indicated obvious seasonal variation in the monsoon region, high in summer and low in winter. This was attributed to the difference in moisture sources in different seasons. ③ In addition, no significant correlation was detected between δO values in precipitation with temperature and precipitation (=0.03; =0.12). But it was sensitive to atmospheric circulation effect, and was positively correlated with ENSO.δO values in precipitation and deuterium excess in precipitation clearly recorded the La Niño and El Niño conversion process between 2014 and 2015. During the El Niño event, the δO and values became obvious on the high side, and the changes were the opposite during La Niño.
利用2015年4月至10月100组日降水稳定同位素数据，分析了降水中氢、氧稳定同位素变化、氘过量及其与降水、温度和ENSO（厄尔尼诺/拉尼娜-南方涛动）的关系。结果表明：①建立了本地大气降水线（LMWL）方程：δD = 8.28δO + 12.34，其截距和斜率大于全球大气降水线（GMWL），但与中国南方季风区大部分地区相似。②降水中稳定同位素和氘过量在季风区均表现出明显的季节变化，夏季高，冬季低。这归因于不同季节水汽源的差异。③此外，降水中δO值与温度和降水之间未检测到显著相关性（r = 0.03；r = 0.12）。但其对大气环流效应敏感，且与ENSO呈正相关。降水中的δO值和降水中的氘过量清楚地记录了2014年至2015年期间拉尼娜和厄尔尼诺的转换过程。在厄尔尼诺事件期间，δO和δD值明显偏高，而在拉尼娜期间变化则相反。
