Regional gravity field modelling from GOCE observables

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23520%2F17%3A43929217" target="_blank" >RIV/49777513:23520/17:43929217 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1016/j.asr.2016.09.024" target="_blank" >http://dx.doi.org/10.1016/j.asr.2016.09.024</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.asr.2016.09.024" target="_blank" >10.1016/j.asr.2016.09.024</a>

Result language

angličtina

Original language name

Regional gravity field modelling from GOCE observables

Original language description

In this article we discuss a regional recovery of gravity disturbances at the mean geocentric sphere approximating the Earth over the area of Central Europe from satellite gravitational gradients. For this purpose, we derive integral formulas which allow converting the gravity disturbances onto the disturbing gravitational gradients in local north-oriented frame (LNOF). The derived formulas are free of singularities in case of r &lt; R. We then investigate three numerical approaches for solving their inverses. In the initial approach, the integral formulas are firstly modified for solving individually the near- and distant-zone contributions. While the effect of the near-zone gravitational gradients is solved as an inverse problem, the effect of the distant-zone gravitational gradients is computed by numerical integration from a global equiangular grid synthesized from the global gravitational model (GGM) TIM-r4. In the second approach, we further elaborate the first scenario by reducing measured gravitational gradients for gravitational effects of topographic masses. In the third approach, we apply additional modification by reducing gravitational gradients for the reference GGM. In all approaches we determine the gravity disturbances from each of the four accurately measured gravitational gradients separately as well as from their combination. Our regional gravity field solutions are based on the GOCE EGG_TRF_2 gravitational gradients collected within the period from November 1 2009 until January 11 2010. Obtained results are compared with EGM2008, DIR-r1, TIM-r1 and SPW-r1. The best fit, in terms of RMS (2.9 mGal), is achieved for EGM2008 while using a third approach which combine all four well-measured gravitational gradients. This is explained by the fact that a-priori information about Earth&apos;s gravitational field up to degree and order 180 was used.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10508 - Physical geography

Project

<a href="/en/project/LO1506" target="_blank" >LO1506: Sustainability support of the centre NTIS - New Technologies for the Information Society</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

ADVANCES IN SPACE RESEARCH

ISSN

0273-1177

e-ISSN

—

Volume of the periodical

59

Issue of the periodical within the volume

1

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

14

Pages from-to

114-127

UT code for WoS article

000392769500011

EID of the result in the Scopus database

2-s2.0-85006415946