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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Models of isostatic and dynamic topography, geoid anomalies, and their uncertainties
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Models of isostatic and dynamic topography, geoid anomalies, and their uncertainties

机译：等静和动态地形模型，大地水准面异常及其不确定性

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Knowledge of the dynamic topography at Earth's surface caused by sublithospheric density contrasts would provide crucial constraints on models of mantle dynamics. We calculate global models of this dynamic topography by subtracting from the observed topography estimates of the topography caused by assumed isostatically compensated density variations in the crust, the oceanic lithosphere, and the continental tectosphere. We also calculate the isostatic geoid anomaly that would result from these compensated near-surface density anomalies. Because there is controversy about the thermal structure of old oceanic lithosphere, we investigate two models of the cooling of the oceanic lithosphere (half-space and plate) and calculate the effect of each on the inferred dynamic topography. Peak amplitudes of dynamic topography from sublithospheric sources expanded to spherical harmonic degree 6 are approximately +/-1 km. We estimate the uncertainties in the calculated dynamic topography and geoid by combining the errors in the data and systematic errors. To obtain the spectral coefficients of the fields, we use weighted least squares inversions. The calculated dynamic topography arising fi om sublithospheric sources, residual geoid, and errors associated with these fields can be used in studies of mantle dynamics. [References: 40]
机译：岩石圈以下密度对比引起的地球表面动态地形知识将为地幔动力学模型提供关键的约束。通过从观察到的地形估计值中减去由假定的等静压补偿的地壳，海洋岩石圈和大陆对流层的密度变化引起的地形，我们可以计算出这种动态地形的整体模型。我们还计算了由这些补偿的近地表密度异常引起的等静地大地水准面异常。由于对旧的海洋岩石圈的热结构存在争议，因此我们研究了海洋岩石圈冷却的两个模型（半空间和板块），并计算了每个模型对推断的动态地形的影响。来自岩石下层源的动态形貌的峰值幅度扩展到了球谐度6，约为+/- 1 km。我们通过结合数据中的误差和系统误差来估计所计算出的动态地形和大地水准面的不确定性。为了获得场的频谱系数，我们使用加权最小二乘反演。计算出的由岩石圈下源，残留大地水准面以及与这些场相关的误差引起的动态地形可用于地幔动力学研究。 [参考：40]

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