Global topographically corrected and topo-density contrast stripped gravity field from EGM08 and crust 2.0

Robert Tenzer, Hamayun, P. Vajda

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

We compute globally the topographically corrected and topo-density contrast stripped gravity disturbances and gravity anomalies taking into account the major known density variations within the topography. The topographical and topo-density contrast stripping corrections are applied to the EGM08 gravity field quantities in two successive steps. First, the gravitational contribution of the topography of constant average density 2,670 kg/m3is subtracted. Then the ice, sediment, and upper crust topo-density contrast stripping corrections are applied to the topographically corrected gravity field quantities in order to model the gravitational contribution due to anomalous density variations within the topography. The coefficients of the global geopotential model EGM08 complete to degree 180 of spherical harmonics are used to compute the gravity disturbances and gravity anomalies. The 5 × 5 arc-min global elevation data from the ETOPO5 are used to generate the global elevation coefficients. These coefficients are utilized to compute the topographical correction with a spectral resolution complete to degree and order 180. The 2 × 2 arc-deg global data of the ice, sediment, and upper crust from the CRUST 2.0 global crustal model are used to compute the ice, sediment, and upper crust topo-density contrast stripping corrections with a 2 × 2 arc-deg spatial resolution. All data are evaluated globally on a 1 × 1 arc-deg grid at the Earth's surface.
Original languageEnglish
Title of host publicationGeodesy for Planet Earth - Proceedings of the 2009 IAG Symposium
Pages389-399
Number of pages11
Volume136
DOIs
Publication statusPublished - 1 Dec 2012
Externally publishedYes
EventIAG Symposium on Geodesy for Planet Earth, IAG 2009 - Chania, Crete, Argentina
Duration: 31 Aug 20094 Sep 2009

Conference

ConferenceIAG Symposium on Geodesy for Planet Earth, IAG 2009
Country/TerritoryArgentina
CityChania, Crete
Period31/08/094/09/09

ASJC Scopus subject areas

  • Computers in Earth Sciences
  • Geophysics

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