Arid
DOI10.1007/978-3-642-20338-1_37
Signals of Mass Redistribution at the South African Gravimeter Site SAGOS
Kroner, C.1; Werth, S.2; Pflug, H.3; Guentner, A.3; Creutzfeldt, B.3; Thomas, M.3; Dobslaw, H.3; Fourie, P.4; Charles, P. H.4
通讯作者Kroner, C.
会议名称Scientific Assembly of the International-Association-of-Geodesy (IAG) - Geodesy for Planet Earth
会议日期AUG 31-SEP 04, 2009
会议地点Buenos Aires, ARGENTINA
英文摘要

The superconducting gravimeter (SG) operating at the South African Geodynamic Observatory Sutherland (SAGOS) is one of the few instruments installed in the southern hemisphere and presently still the only one of its kind on the African continent. SAGOS is located in the Karoo, a semi-arid area with an average annual precipitation of 200-400 mm. The distance to the ocean is approx. 220 km.


A local hydrology-related seasonal effect on gravity is clearly seen in the SG record. Its general order of magnitude is estimated to be about 4-10 nm/s(2). A large-scale hydrological influence in a similar order of magnitude or even larger (up to 60 nm/s(2) peak-to-peak) is inferred from global hydrological models for the years 2003-2007. Significant contributions are found for the southern coast, the central Cape region, and the basin of the Orange river. Contributing basins with larger distance comprise the areas of Okavango/Sambesi, Congo, and eastern Africa. Between SG data, temporal GRACE gravity field solutions, and the gravity effect derived from global hydrological models clear differences exist. Among others, the deviations between the hydrological models can be traced to deviations in the gravity effect originating from the Okavango basin and the central Cape region.


Gravity residuals reduced for changes in continental water storage are compared to the gravity effect caused by non-tidal oceanic mass changes. A rudimentary correlation between observed variations and modeled effect is found.


The peak-to-peak amplitude of the modeled effects amounts to 15 nm/s(2) for the years 2001-2008. After reducing the SG data for this oceanic effect the variation of the residuals decreases by 9%.


The present findings indicate the suitability of the SG observations at Sutherland for studies on mass transport phenomena in the South African region.


来源出版物GEODESY FOR PLANET EARTH: PROCEEDINGS OF THE 2009 IAG SYMPOSIUM
ISSN0939-9585
出版年2012
卷号136
页码305-313
ISBN978-3-642-20337-4
EISBN978-3-642-20338-1
出版者SPRINGER-VERLAG BERLIN
类型Proceedings Paper
语种英语
国家Germany;South Africa
收录类别CPCI-S
WOS记录号WOS:000300433100037
WOS关键词MODEL ; EARTH
WOS类目Geosciences, Multidisciplinary ; Remote Sensing
WOS研究方向Geology ; Remote Sensing
资源类型会议论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/301243
作者单位1.Phys Tech Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany;
2.Univ Potsdam, Inst Earth & Environm Sci, D-14476 Golm, Germany;
3.German Res Ctr Geosci, Helmholtz Ctr Potsdam GFZ, D-14473 Potsdam, Germany;
4.South African Astronom Obser, Cape Town 7925, South Africa
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Kroner, C.,Werth, S.,Pflug, H.,et al. Signals of Mass Redistribution at the South African Gravimeter Site SAGOS[C]:SPRINGER-VERLAG BERLIN,2012:305-313.
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