GRACE时变信号恢复方法对比分析
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摘要
针对利用GRACE重力数据反演地表质量变化过程中产生的时变信号削弱和泄露现象,分别采用尺度因子法和迭代恢复法对信号进行恢复,并选用CSR Mascon产品从时间序列变化和空间分布两个角度对两种恢复方法的效果进行对比分析。结果表明:1)尺度因子法虽实现上较为简单,但其计算结果完全依赖于所选的先验模型,当所选模型的可靠性较差时,会影响到GRACE反演结果的可靠性。2)迭代恢复法的恢复过程仅受GRACE原始观测值的约束,能较好地恢复研究区域的长期趋势信号和周期信号,但在部分区域可能存在信号过量恢复的现象。建议采用迭代恢复法进行GRACE时变信号恢复。
In view of the phenomenon of time-varying signal weakening and leakage in the process of GRACE data preprocessing,the scaling factors method and the forward modeling method are used to recover the lost signals.CSR Mascon products are adopted to compare the effects of the two recovery methods from the perspective of time series and spatial distribution.Results show:1)The scaling factors method is relatively simple to implement,but the result of the scaling factors is completely dependent on the prior model,and when the reliability of the selected model is poor,the reliability of the GRACE inversion results are affected.2)The restoration process of the forward modeling method is constrained by the original GRACE observations,and can restore the long-term trend and periodic signals,but there may be signal over-recovery in some areas.In restoring GRACE time-varying signals,we suggest using the forward modeling method.
In view of the phenomenon of time-varying signal weakening and leakage in the process of GRACE data preprocessing,the scaling factors method and the forward modeling method are used to recover the lost signals.CSR Mascon products are adopted to compare the effects of the two recovery methods from the perspective of time series and spatial distribution.Results show:1)The scaling factors method is relatively simple to implement,but the result of the scaling factors is completely dependent on the prior model,and when the reliability of the selected model is poor,the reliability of the GRACE inversion results are affected.2)The restoration process of the forward modeling method is constrained by the original GRACE observations,and can restore the long-term trend and periodic signals,but there may be signal over-recovery in some areas.In restoring GRACE time-varying signals,we suggest using the forward modeling method.
引文
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[15]邹贤才,金涛勇,朱广彬.卫星跟踪卫星技术反演局部地表物质迁移的MASCON方法研究[J].地球物理学报,2016,59(12):4 623-4 632(Zou Xiancai,Jin Taoyong,Zhu Guangbin.Research on the MASCON Method for the Determination of Local Surface Mass Flux with Satellite-Satellite Tracking Technique[J].Chinese Journal of Geophysics,2016,59(12):4623-4 632
[2] Long D,Chen X,Scanlon B R,et al.Have GRACE Satellites Overestimated Groundwater Depletion in the Northwest India Aquifer?[J].Sci Rep,2016(6)
[3] Chambers D P,Bonin J A. Evaluation of Release-05GRACE Time-Variable Gravity Coefficients over the Ocean[J].Ocean Science,2012,8(5):859-868
[4] Swenson S,Chambers D,Wahr J.Estimating Geocenter Variations from a Combination of GRACE and Ocean Model Output[J].Journal of Geophysical Research:Atmospheres,2008,113(B8):194-205
[5] Cheng M K,Ries J C.Monthly Estimates of C20from 5SLR Satellites Based on GRACE RL05 Models,GRACE Technical Note07[Z].Austin:Center for Space Research,2012
[6] Wahr J,Molenaar M,Bryan F.Time Variability of the Earth’s Gravity Field:Hydrological and Oceanic Effects and Their Possible Detection Using GRACE[J].Journal of Geophysical Research:Solid Earth,1998,103(B12):30 205-30 230
[7] Swenson S,Wahr J.Post-Processing Removal of Correlated Errors in GRACE Data[J].Geophysical Research Letters,2006,33(8)
[8] Velicogna I,Wahr J.Acceleration of GreenlandIce Mass Loss in Spring 2004[J].Nature,2006,443(7109):29-31
[9] Landerer F W,Swenson S C.Accuracy of Scaled GRACE Terrestrial Water Storage Estimates[J].Water Resources Research,2012,48(4)
[10]Chen J L,Wilson C R,Tapley B D.Satellite Gravity Measurements Confirm Accelerated Melting of Greenland Ice Sheet[J].Science,2006,313(5795):1 958-1 960
[11]Chen J L,Wilson C R,Tapley B D.Contribution of Ice Sheet and Mountain Glacier Melt to Recent Sea Level Rise[J].Nature Geoscience,2013,6(7):549-552
[12]Jacob T,Wahr J,Pfeffer W T,et al.Recent Contributions of Glaciers and Ice Caps to Sea Level Rise[J].Nature,2012,482(7386):514
[13]Geruo A,Wahr J,Zhong S.Computations of the Viscoelastic Response of a 3-D Compressible Earth to Surface Loading:An Application to Glacial Isostatic Adjustment in Antarctica and Canada[J].Geophysical Journal International,2013,192(2):557-572
[14]Save H,Bettadpur S,Tapley B D.High-Resolution CSR GRACE RL05Mascons[J].Journal of Geophysical Research:Solid Earth,2016,121(10):7 547-7 569
[15]邹贤才,金涛勇,朱广彬.卫星跟踪卫星技术反演局部地表物质迁移的MASCON方法研究[J].地球物理学报,2016,59(12):4 623-4 632(Zou Xiancai,Jin Taoyong,Zhu Guangbin.Research on the MASCON Method for the Determination of Local Surface Mass Flux with Satellite-Satellite Tracking Technique[J].Chinese Journal of Geophysics,2016,59(12):4623-4 632
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