GRACE时变重力位系数扇形滤波算法分析

Fan Filtering Algorithm Analysis of GRACE Time-Variable Geopotential Coeffcients

卫星重力探测技术为监测全球陆地水储量变化提供了新的技术手段。采用Level-2 Release-05版本GRACE时变重力场模型数据计算了2010年全球陆地水储量的月变化;着重研究了扇形滤波对反演结果的影响;并结合GLDAS水文模型数据对反演结果进行了验证分析。实验结果表明:GRACE反演结果 GLDAS水文模型结果在时空分布上符合较好;扇形滤波能够削弱GRACE时变重力场模型的高阶项误差影响,有效去除反演结果中的条带状噪声。

The satellite gravimetry detection technology provides a new technical means for monitoring global continental water storage variation. The global continental water storage variation in 2010 was calculated using GRACE Level-2 Release-05 data published by GFZ. The inversion result was verified well by GLDAS hydrological model.The influence of filtering on global continental water storage variation results was studied. Because fan filtering can weaken high degree noises in GRACE time-variable gravity model, striping N-S noises was removed effectively by fan filtering in experiment. The experiment results also show that the global continental water storage variation calculated by GRACE time-variable gravity and GLDAS hydrological model coincides well in spatial and temporal distribution.