Effect of global mass conservation among geophysical fluids on the seasonal length of day variation
Effect of global mass conservation among geophysical fluids on the seasonal length of day variation
复制标题
地球物理流体的全球质量守恒对季节日长变化的影响
DOI：
10.1029/2011jb008788
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发表时间：
2012-02
期刊：
影响因子：
--
通讯作者：
Benjamin F Chao
中科院分区：
文献类型：
--
作者：
Haoming Yan;Benjamin F Chao
大气、海洋和陆地水文的地球物理流体模型通常不能单独或共同地正确执行质量守恒。这些误差被称为全球质量平衡（GMB）效应，如果不加以纠正，将严重影响地球物理流体对地球自转速率或日长（LOD）变化的影响。在这里，我们分析了季节预算的激发源LOD变化与相应的观测比较。我们发现：（1）地球物理流体引起的LOD变化的组合质量诱导激发与考虑GMB效应后的观测结果更加一致;（2）如果大气角动量的运动项（在获得质量诱导的LOD变化时从观察到的LOD变化中删除）放大7%，证实了Chao和Yan（2010）的发现;（3）上述量与由卫星激光测距观测的J2变化确定的等效LOD变化非常吻合，表明后者作为地球物理流体质量输运的独立测量是有用的。
Geophysical fluids models for the atmosphere, ocean, and land hydrology usually do not properly enforce the conservation of mass either individually or collectively. Called the global mass balance (GMB) effect, these errors, if not corrected, will significantly affect the determination of the effect of geophysical fluids on the variation in the Earth's rotation rate or length of day (LOD). Here we analyze the seasonal budget of the excitation sources for LOD variation in comparison with corresponding observations. We find that (1) the combined mass‐induced excitations of LOD variation by geophysical fluids are brought to much better agreement with the observed upon accounting for the GMB effect; (2) the above can be further improved to almost perfect closure if the motion term of the atmospheric angular momentum (to be removed from the observed LOD variation in obtaining the mass‐induced LOD variation) is magnified by 7%, corroborating the finding of Chao and Yan (2010); and (3) the above quantities all agree remarkably well with the equivalent LOD variation determined via J2 variation from satellite laser ranging observations, indicating the usefulness of the latter as an independent measurement for mass transports in the geophysical fluids.
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影响因子：
56.9
作者：
通讯作者：
--
影响因子：
4.4
作者：
Jianli Chen;C. Wilson;B. Tapley
通讯作者：
Jianli Chen;C. Wilson;B. Tapley
DOI：
--
发表时间：
2013-02
期刊：
--
影响因子：
--
作者：
J. T. Ratcliff;R. Gross
通讯作者：
J. T. Ratcliff;R. Gross
影响因子：
2.2
作者：
J. Nystuen
通讯作者：
J. Nystuen
影响因子：
3.6
作者：
GREATBATCH, RJ
通讯作者：
GREATBATCH, RJ