On the estimation of accuracy for global models of gravitational field of the earth     

V. N. Koneshov  V. B. Nepoklonov  R. A. Sermyagin  E. A. Lidovskaya 《Izvestiya Physics of the Solid Earth》2014,50(1):127-136

The methods and techniques for estimating the accuracy of global models of the Earth’s gravity field in the form of spherical harmonic expansion of the geopotential are analyzed. Various methods for obtaining the a priori and a posteriori estimates for the accuracy are considered and classified. The application of different approaches is illustrated by numerical examples for nine models, including those recently developed using the modern methods of space geodesy. The basic requirements for the database and software for estimating the accuracy are formulated.  相似文献   

Using the Digital Models of Gravity Anomalies for Zoning of the Earth’s Gravity Field     

V. N. Koneshov  S. A. Krylov  D. S. Loginov  V. B. Nepoklonov 《Izvestiya Physics of the Solid Earth》2018,54(6):964-970

This paper addresses the questions associated with using the models in regioning the Earth’s gravity field depending on its roughness and type of anomalies. A formalized technique for zoning based on the analysis of the intensity and variability of gravity anomalies is suggested. The suggested technique includes preprocessing the initial gravity anomalies aimed at eliminating the noise component; partitioning the studied region into the elementary segments; calculating the primary characteristics of the complexity and roughness (the intensity and variability of gravity anomalies) for each segment; and, based on these characteristics, classifying each segment into a particular category of complexity. The proposed system of classification of segments relies on the use of three classes of intensity and three classes of variability of gravity anomalies and four categories of complexity of the regions, which are derived from these classes. As a result of applying the technique, the mapped territory is subdivided into the regions that are uniform in terms of their geophysical properties. The developed technique is used for comparing the quality of the different digital models of gravity anomalies, including the Russian RGM model (A.P. Karpinsky Russian Geological Research Institute (VSEGEI)) and the WGM model (Bureau Gravimétrique International (BGI)) in the region of the Mongol–Okhotsk orogenic belt and Sikhote–Alin fold system. The results of the study can be used for zoning of the other geophysical fields and for planning the locations of the new survey networks for increasing the accuracy of the initial data used for compiling the maps.  相似文献   

Studying the Representation Accuracy of the Earth’s Gravity Field in the Polar Regions Based on the Global Geopotential Models     

V. N. Koneshov  V. B. Nepoklonov 《Izvestiya Physics of the Solid Earth》2018,54(3):504-512

The development of studies on estimating the accuracy of the Earth’s modern global gravity models in terms of the spherical harmonics of the geopotential in the problematic regions of the world is discussed. The comparative analysis of the results of reconstructing quasi-geoid heights and gravity anomalies from the different models is carried out for two polar regions selected within a radius of 1000 km from the North and South poles. The analysis covers nine recently developed models, including six high-resolution models and three lower order models, including the Russian GAOP2012 model. It is shown that the modern models determine the quasi-geoid heights and gravity anomalies in the polar regions with errors of 5 to 10 to a few dozen cm and from 3 to 5 to a few dozen mGal, respectively, depending on the resolution. The accuracy of the models in the Arctic is several times higher than in the Antarctic. This is associated with the peculiarities of gravity anomalies in every particular region and with the fact that the polar part of the Antarctic has been comparatively less explored by the gravity methods than the polar Arctic.  相似文献   

One technique for refining the global Earth gravity models     

V. N. Koneshov  V. B. Nepoklonov  O. V. Polovnev 《Izvestiya Physics of the Solid Earth》2017,53(1):108-115

The results of the theoretical and experimental research on the technique for refining the global Earth geopotential models such as EGM2008 in the continental regions are presented. The discussed technique is based on the high-resolution satellite data for the Earth’s surface topography which enables the allowance for the fine structure of the Earth’s gravitational field without the additional gravimetry data. The experimental studies are conducted by the example of the new GGMplus global gravity model of the Earth with a resolution about 0.5 km, which is obtained by expanding the EGM2008 model to degree 2190 with the corrections for the topograohy calculated from the SRTM data. The GGMplus and EGM2008 models are compared with the regional geoid models in 21 regions of North America, Australia, Africa, and Europe. The obtained estimates largely support the possibility of refining the global geopotential models such as EGM2008 by the procedure implemented in GGMplus, particularly in the regions with relatively high elevation difference.  相似文献   

Study of the anomalous gravity field in the arctic based on modern geopotential models     

V. N. Koneshov  V. B. Nepoklonov  I. A. Stolyarov 《Izvestiya Physics of the Solid Earth》2012,48(7-8):587-593

The results of modeling the anomalous gravity field of the Earth in the high-latitude regions, which are of interest in the context of Arctic exploration, are analyzed. The structure and accuracy characteristics of quasi-geoid heights (QGH) and gravity anomalies (GAs) in the Arctic are studied. The analysis addresses fifteen modern Russian and foreign spherical harmonic models of the gravitational potential of the Earth, including the EGM-2008 model, which provides high-order spherical harmonic representations, and the first models based on the data of satellite gradiometry.  相似文献   

Comparative Assessment of Global Models of the Earth’s Gravity Field     

Koneshov  V. N.  Nepoklonov  V. B.  Spiridonova  E. S.  Maksimova  M. V. 《Izvestiya Physics of the Solid Earth》2020,56(2):249-259

Izvestiya, Physics of the Solid Earth - Abstract—Empirical comparative study of the modern global models of the Earth’s gravity field (EGF) in the form of geopotential spherical...  相似文献   

Arctic gravity exploration: state of the art and prospects     

V. N. Koneshov  V. B. Nepoklonov  V. V. Pogorelov  V. N. Solov’ev  L. V. Afanas’eva 《Izvestiya Physics of the Solid Earth》2016,52(3):443-451

The application of the airborne gravimetry method for gravity measurements in the Arctic is considered. This method has been extensively employed in foreign studies for determining the figure of the Earth in high-latitude conditions. The possibility of conducting comparative studies along the extensive survey lines and the necessity of aerogravimetry studies for improving the global Earth’s gravity field (EGF) models are discussed. The possibility of the efficient application of the modern EGF models for estimating the systematical errors for different types of gravimetry surveys and exploring the influence of the anomalous far-zone field in the calculations of the plumb line deviations is demonstrated.  相似文献