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首页> 外文期刊>Journal of geodynamics >Gravity tide and seasonal gravity variation at Ny-Alesund, Svalbard in Arctic
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Gravity tide and seasonal gravity variation at Ny-Alesund, Svalbard in Arctic

机译：北极斯瓦尔巴特群岛Ny-Alesund的重力潮和季节性重力变化

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摘要

We have analyzed 4 years of gravity data (September 1999-August 2003) obtained from the superconducting gravimeter at Ny-Alesund, Svalbard in Arctic. The tidal analysis results indicate that the time variation in amplitude and phase of the short-period gravity tides may be due to the seasonal variation of the ocean tides, especially in the semidiurnal band. The gravity residuals, which were reduced from the following three effects from the original data: (1) the observed short- and long-period tides (up to the annual Sa wave) including the loading and attraction of ocean tide, (2) the air pressure and (3) the polar motion, show clear correlation with the computed hydrological effects (i.e. the effects of soil moisture and snow) in both the amplitude and phase. However, we found that the gravity data reveal a problem in the snow model at Ny-Alesund that was used for the computation. The vertical motion obtained from the continuous GPS measurements carried out near the gravity station shows seasonal variations that are consistent with the gravity data at least in their sign.
机译：我们已经分析了4年（1999年9月至2003年8月）的重力数据，这些数据是从北极斯瓦尔巴特群岛的Ny-Alesund的超导重力仪获得的。潮汐分析结果表明，短周期重力潮的振幅和相位的时间变化可能是由于海洋潮汐的季节变化，特别是在半日波段。重力残差从原始数据的以下三个影响中减少：（1）观测到的短时和长时潮汐（直到每年的Sa波），包括洋潮的载荷和吸引力，（2）气压和（3）极运动在振幅和相位上都与计算出的水文效应（即土壤水分和积雪的效应）显示出明显的相关性。但是，我们发现重力数据揭示了Ny-Alesund雪模型中用于计算的问题。从重力站附近进行的连续GPS测量获得的垂直运动显示出季节性变化，至少在其符号上与重力数据一致。

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