GDO Indicator for Forecasting Unusually Wet and Dry Conditions SPI-3 based on the forecast of ECMWF (version 2.1.0)

The indicator provides robust forecasts of the occurrence of on unusual dry or wet precipitation conditions over the next 3 months. It is computed based on the forecasted Standardized Precipitation Index (SPI-3), derived from the long-range (i.e. seasonal) forecast system (SEAS51) of the European Centre for Medium-Range Weather Forecasts (ECMWF).
This indicator is calculated using a reference period between the year 1981 and 2016. It has a spatial resolution of 1 decimal degree and a temporal resolution of 1 month.

本指标可对未来3个月内异常干旱或降水偏多事件的发生情况提供稳健预报。其计算依托欧洲中期天气预报中心（European Centre for Medium-Range Weather Forecasts，ECMWF）的远程（即季节尺度）预报系统（SEAS51）生成的预报标准化降水指数（Standardized Precipitation Index，SPI-3）完成。
本指标以1981年至2016年为参考时段开展计算，空间分辨率为1十进制度，时间分辨率为1个月。