Oceanic effects on polar motion determined from an ocean model and satellite altimetry: 1993-2001

Oceanic effects on polar motion determined from an ocean model and satellite altimetry: 1993-2001
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根据海洋模型和卫星测高确定的海洋对极移的影响:1993-2001

DOI:
10.1029/2003jb002664
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发表时间:
2004-02
期刊:
Journal of Geophysical Research, 109(B2), B02411, doi:10.1029/2003JB002664, 2004
影响因子:
--
通讯作者:
Tapley BD
Tapley BD
中科院分区:
其他
文献类型:
--
作者:
Chen JL;Wilson CR;Hu XG;Zhou YH;Tapley BD

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海洋中的物质再分配和运动是大地测量变化的主要驱动力,包括极地运动、日长、地心和重力场变化。我们使用数据同化海洋环流模式和卫星雷达高度计观测的估计值来研究海洋对极地运动的贡献。这些数据包括海洋质量(OBP)以及经向和纬向速度变化的模型估计。由TOPEX/Poseidon(T/P)卫星高度计测量得到的海平面异常和由该模式推导出的海平面高度变化也被用来估计OBP效应。与以前的研究结果相比,模式和T/P的估计海洋贡献与极地运动观测结果的一致性要好得多。这一改善在季节内的时间尺度上尤为显著。OBP和洋流变化对极地运动都有重要贡献。在季节内的时间尺度上,海洋似乎是残存极地运动的主要贡献者,大气没有考虑到这一点。海洋在季节性激发方面也起着重要作用。OBP和洋流的综合贡献解释了剩余半年变化的很大一部分原因。
Mass redistribution and motion in the oceans are major driving forces of geodetic variations, including polar motion, length of day, geocenter, and gravity field changes. We examine oceanic contribution to polar motion using estimates from a data‐assimilating ocean general circulation model and satellite radar altimeter observations. The data include model estimates of variations in oceanic mass (OBP) and meridional and zonal velocities. Sea level anomalies from TOPEX/Poseidon (T/P) satellite altimeter measurements and steric sea surface height changes deduced from the model are also used to estimate OBP effects. Estimated oceanic contributions from both the model and T/P show considerably better agreement with polar motion observations compared with results from previous studies. The improvement is particularly significant at intraseasonal timescales. Both OBP and ocean current variations provide important contributions to polar motion. At intraseasonal timescales the oceans appear to be a dominant contributor to residual polar motion not accounted for by the atmosphere. The oceans also play an important role in seasonal excitation. Combined OBP and ocean current contributions explain much of the residual semiannual variability.
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