关于ENSO事件监测指数的改进方案

为了改进气象行业标准（国标）推荐的厄尔尼诺/拉尼娜事件监测指数所涉及的异常数据带有趋势、间隔10年的修订所可能引入的额外周期、指数一致性及气候标准值变动所引起的事件属性、强弱的变化等系列问题，本文基于一个可以消除一阶趋势并舍弃气候标准值的异常计算方法用以构建相关指数。结果表明，该方案所计算的指数与原指数具有较好的一致性，在有显著趋势的序列中，本方案较气象行业标准推荐方案算法简单，趋势消解显著，在应对气候变暖等系列问题中，本方案具有推广价值。

Improvement of El Nino/La Nina Event Monitoring Index

In order to improve the trend of abnormal data, the extra period that the revision of the 10 year interval may introduce, the consistency of the El Nino/La Nina event monitoring index and the change of the event attribute and strength caused by the change of the climate standard value which are recommended by the meteorological industry standard (national standard), this paper constructs correlation indices based on an anomaly calculation method that can eliminate the first order trend and discard the climate standard values. The results show that the index calculated by the scheme is in good consistency with the original method. In the series with the significant trend, the algorithm of this scheme is simpler than the meteorological industry standard recommended scheme, and the trend resolution is significant. This scheme may have promotion value in dealing with climate warming and other problems.