降水资料标准化

李研

To identify the PHR events over the MLYRV, the subseasonal rainfall anomalies for the summers of 1979–2011, averaged for 53 stations, were first obtained. The time series were then normalized to unit standard deviation and referred to as the subseasonal rainfall anomaly index (RI). Figure 2 displays time series of the daily rainfall and RI over the MLYRV for the summers of 1991 and 2009.APHR event (also referred to as active events in this study) is identified when the RI exceeds its one standard deviation in at least three consecutive days. Additionally, a break event is identified when the RI is below minus one standard deviation in at least three successive days, in contrast with the PHR events.（Ren et al.,2013）
Ren et al(2013)在论文中提到首先对53站降水资料进行平均，然后标准化得到降水异常指数RI。标准差>1为1次极端降水事件,<-1为一次干旱（break）事件。
我在计算时选取了同样的地区但是计算得到的日降水量要小于论文的值，并且标准化后的降水资料没有小于-1的值。
请问论坛中有做过类似降水指数或者了解的亲们吗，我思考了一周仍然没有找到错误的原因，期望能够得到大家的帮助，非常感谢！

nunu18

看着你画的图和论文中的趋势都是一样的，是不是降水两级不一样