利用GRACE、GPS和绝对重力数据监测斯堪的纳维亚陆地水储量变化
发布时间：2018-08-26 07:12
【摘要】：重力卫星GRACE(gravity recovery and climate experiment)监测斯堪的纳维亚半岛陆地水储量变化会受到冰川均衡调整(GIA)信号的严重影响。首先根据该地区绝对重力和GPS并址观测数据计算了GIA重力和垂直位移的实测线性比值,利用该比值和GPS网观测的垂直位移速度场得到了GIA重力。然后,对GRACE观测的重力变化速率进行GIA重力改正,进而可分离陆地水储量变化趋势,避免了使用GIA模型所带来的巨大不确定性,并根据观测数据完整估计了所得结果的不确定性。最后与水文模型作对比分析。结果表明,实测的GIA重力-垂直位移线性比值为0.148±0.020μGal/mm(1Gal=10-2 m/s2),该结果检验了Wahr的理论近似值且与北美实测的结果非常接近。2003年1月至2011年3月期间,斯堪的纳维亚半岛陆地水储量存在明显的增加趋势,信号的主体位于半岛南端的维纳恩湖附近,总的水量增加速率为4.6±2.1km3/a,数据观测期间的累积增加水量为38±17km3。研究结果与WGHM水文模型的结果有较好的一致性,相关系数达到0.69,而与GLDAS水文模型的相关性略小。
[Abstract]:Gravity recovery and Climate Experiment (GRACE) monitoring Scandinavian land water reserve changes can be severely affected by glacial equilibrium adjustment (GIA) signals. First, the measured linear ratio of GIA gravity and vertical displacement is calculated based on the absolute gravity and GPS observation data in the area, and the ratio is used with the GPS network. The GIA gravity is obtained from the observed vertical displacement velocity field. Then, the gravity change rate observed by GRACE is corrected by GIA gravity, and the change trend of terrestrial water reserves can be separated, thus avoiding the enormous uncertainties caused by the use of GIA model, and the uncertainty of the result is estimated completely according to the observed data. Finally, the results are compared with the hydrological model. The results show that the measured GIA gravity-vertical displacement linear ratio is 0.148+0.020 ugal/m m (1Gal=10-2 m/s2), which verifies the theoretical approximation of Wahr and is very close to the measured results in North America. The main body is located near Lake Venant at the southern end of the peninsula. The total water increment rate is 4.6+2.1 km 3/a. The cumulative water increment during the data observation period is 38+17 km 3.
【作者单位】： 地壳运动监测工程研究中心;中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室;
【基金】：地震科技星火计划(XH15057) 国家自然科学基金(41204013;41274026) 国家973计划(2012CB957703)~~
【分类号】：P22;P332
[Abstract]:Gravity recovery and Climate Experiment (GRACE) monitoring Scandinavian land water reserve changes can be severely affected by glacial equilibrium adjustment (GIA) signals. First, the measured linear ratio of GIA gravity and vertical displacement is calculated based on the absolute gravity and GPS observation data in the area, and the ratio is used with the GPS network. The GIA gravity is obtained from the observed vertical displacement velocity field. Then, the gravity change rate observed by GRACE is corrected by GIA gravity, and the change trend of terrestrial water reserves can be separated, thus avoiding the enormous uncertainties caused by the use of GIA model, and the uncertainty of the result is estimated completely according to the observed data. Finally, the results are compared with the hydrological model. The results show that the measured GIA gravity-vertical displacement linear ratio is 0.148+0.020 ugal/m m (1Gal=10-2 m/s2), which verifies the theoretical approximation of Wahr and is very close to the measured results in North America. The main body is located near Lake Venant at the southern end of the peninsula. The total water increment rate is 4.6+2.1 km 3/a. The cumulative water increment during the data observation period is 38+17 km 3.
【作者单位】： 地壳运动监测工程研究中心;中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室;
【基金】：地震科技星火计划(XH15057) 国家自然科学基金(41204013;41274026) 国家973计划(2012CB957703)~~
【分类号】：P22;P332
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