利用GRACELevel-2数据产品推求了全球陆地水储量变化,并针对推求过程中高斯平滑半径的选择、位模型截断阶数的选择等问题进行了探讨。研究表明,在推求陆地水储量变化过程中,位模型截断阶数选为20阶,高斯滤波半径取为800km时,计算结果较优,利用GRACE位模型计算的全球陆地水储量变化结果与CPC水文模型的计算结果具有较好的区域符合性和季节对应性。
By use of the GRACE Level-2 products, the variations of global continental water storage are deduced and in the deduction,the problems in the choice of Gaussian filter radius and the truncated degree are discussed. The computation results are good as with Gaussian smoothing radius of 800kin and truncated till 20, and the variations of global continental water storage are in accord with those from CPC model in regional scale and seasonal scale.