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首页> 外文期刊>Journal of Geodesy >Mass evolution of Mediterranean, Black, Red, and Caspian Seas from GRACE and altimetry: accuracy assessment and solution calibration
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Mass evolution of Mediterranean, Black, Red, and Caspian Seas from GRACE and altimetry: accuracy assessment and solution calibration

机译：从GRACE和测高仪对地中海，黑海，红海和里海的大规模演化：准确性评估和解决方案校准

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摘要

We present new measurements of mass evolution for the Mediterranean, Black, Red, and Caspian Seas as determined by the NASA Goddard Space Flight Center (GSFC) GRACE time-variable global gravity mascon solutions. These new solutions are compared to sea surface altimetry measurements of sea level anomalies with steric corrections applied. To assess their accuracy, the GRACE- and altimetry-derived solutions are applied to the set of forward models used by GSFC for processing the GRACE Level-1B datasets, with the resulting inter-satellite range-acceleration residuals providing a useful metric for analyzing solution quality. We also present a differential correction strategy to calibrate the time series of mass change for each of the seas by establishing the strong linear relationship between differences in the forward modeled mass and the corresponding range-acceleration residuals between the two solutions. These calibrated time series of mass change are directly determined from the range-acceleration residuals, effectively providing regionally-tuned GRACE solutions without the need to form and invert normal equations. Finally, the calibrated GRACE time series are discussed and combined with the steric-corrected sea level anomalies to provide new measurements of the unmodeled steric variability for each of the seas over the span of the GRACE observation record. We apply ensemble empirical mode decomposition (EEMD) to adaptively sort the mass and steric components of sea level anomalies into seasonal, non-seasonal, and long-term temporal scales.
机译：我们提供了由NASA戈达德太空飞行中心（GSFC）GRACE时变全球重力mascon解决方案确定的地中海，黑，红和里海质量演化的新度量。将这些新解决方案与应用了空间校正的海平面异常对海平面异常的测量结果进行了比较。为了评估其准确性，将GRACE和高程方法导出的解决方案应用于GSFC用于处理GRACE Level-1B数据集的正向模型集，所得的卫星间距离加速残差为分析解决方案提供了有用的度量质量。我们还提出了一种微分校正策略，通过在正演模拟质量的差异与两种解决方案之间的相应距离加速度残差之间建立强线性关系，来校准每种海洋的质量变化的时间序列。这些校准的质量变化时间序列直接从范围加速残差确定，从而有效地提供了区域调整的GRACE解决方案，而无需形成和求解正态方程。最后，讨论了校准的GRACE时间序列，并将其与空间校正后的海平面异常结合起来，以提供GRACE观测记录范围内每个海洋的未建模空间变异性的新度量。我们应用集合经验模式分解（EEMD）将海平面异常的质量和空间成分自适应地分类为季节，非季节和长期时间尺度。

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