Local Hydrological Effects on Gravity at Metsahovi, Finland: Implications for Comparing Observations by the Superconducting Gravimeter with Global Hydrological Models and with GRACE

被引：3
|
作者：
Makinen, Jaakko [1 ]
Hokkanen, Tero [2 ]
Virtanen, Heikki [1 ]
Raja-Halli, Arttu [1 ]
Makinen, Risto P. [3 ]
机构：
[1] Finnish Geodet Inst, Masala 02431, Finland
[2] Aalto Univ, Dept Civil & Environm Engn, Sch Engn, Aalto 00076, Finland
[3] Finnish Environm Inst, Helsinki 00251, Finland
来源：
GRAVITY, GEOID AND HEIGHT SYSTEMS | 2014年 / 141卷
关键词：
Superconducting gravimeter; Hydrology; Soil moisture; Groundwater; Snow; Continental water storage; GRACE; DATA ASSIMILATION SYSTEM; FIELD;
D O I：
10.1007/978-3-319-10837-7_35
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
We construct a model for the influence of variation in local water storage on the observations of the superconducting gravimeter (SG) T020 in Metsahovi, Finland. The following hydrological components are accounted for: (1) soilmoisture and groundwater in sediments, (2) groundwater in the fractures of the crystalline bedrock, (3) snow on the ground, and (4) snow on the laboratory roof. We show that due to the geometry of the local storage, its gravity influence at the SG is only a fraction of the influence of the corresponding Bouguer sheet, and discuss the implications for comparing the SG with variation in gravity observed with GRACE. We compare the SG residuals with the variation in gravity predicted from the local model and two models of continental water storage. The general patterns are similar but there are differences in amplitude and phase. Further research is outlined.
引用
收藏
页码：275 / 281
页数：7
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