利用GRACE研究我国四大流域陆地水储量循环周期

The Periods of Terrestrial Water Storage Changes of China's Four Basins Derived from GRACE

利用改进的EEMD方法对我国四大流域GRACE水储量时序进行分解,得到不同频率的信号分量。结果表明,流域水储量变化信号具有多种周期特性,长江、黄河、淮河和珠江流域的水储量变化序列中分别存在3.05a、2.37a、2.37a和2.13a的水循环周期。

A modified EEMD method is applied to the GRACE derived terrestrial water storage time series of the four basins. Through this means, various periods of hydrological cycle are captured for these basins, indicating that GRACE derived TWS changes contains lots of cycles. Consequently, the Yangtze, Yellow, Huaihe and Pearl river basins have periods of 3.05, 2.37, 2.37, 2.13 years, respectively.