Clearing observed PGR in GRACE data aimed at global viscosity inversion: Weighted Mass Trends technique

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The time-variable gravity field shows the effects of large present-day mass variations associated with hydrological phenomena and melting ice-sheets, resulting in a shaded Post Glacial Rebound (PGR) signal. A meaningful viscosity inversion based on a global scale comparison of GRACE data and PGR predictions is thus hard to obtain. We derive a weighted surface mass distribution in water equivalent, starting from an initial guess, which portrays the secular effects of present-day phenomena. The gravity field it generates is then carefully removed from GRACE data, resulting in a gravity pattern where the effects of PGR are clearer and ready to be compared with the predictions. On the basis of viscoelastic stratified Earth models and different Pleistocene deglaciation models, we show that the quality of a global preliminary viscosity inversion greatly improves.
Original languageEnglish
JournalGeophysical Research Letters
Volume36
Issue number2
Pages (from-to)5
ISSN0094-8276
DOIs
Publication statusPublished - 2009
Externally publishedYes

Cite this

@article{0019f5ad05984d499c7de4333cf3c6ff,
title = "Clearing observed PGR in GRACE data aimed at global viscosity inversion: Weighted Mass Trends technique",
abstract = "The time-variable gravity field shows the effects of large present-day mass variations associated with hydrological phenomena and melting ice-sheets, resulting in a shaded Post Glacial Rebound (PGR) signal. A meaningful viscosity inversion based on a global scale comparison of GRACE data and PGR predictions is thus hard to obtain. We derive a weighted surface mass distribution in water equivalent, starting from an initial guess, which portrays the secular effects of present-day phenomena. The gravity field it generates is then carefully removed from GRACE data, resulting in a gravity pattern where the effects of PGR are clearer and ready to be compared with the predictions. On the basis of viscoelastic stratified Earth models and different Pleistocene deglaciation models, we show that the quality of a global preliminary viscosity inversion greatly improves.",
author = "Barletta, {Valentina Roberta} and A. Bordoni",
year = "2009",
doi = "10.1029/2008GL036429",
language = "English",
volume = "36",
pages = "5",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "Wiley-Blackwell",
number = "2",

}

Clearing observed PGR in GRACE data aimed at global viscosity inversion: Weighted Mass Trends technique. / Barletta, Valentina Roberta; Bordoni, A.

In: Geophysical Research Letters, Vol. 36, No. 2, 2009, p. 5.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Clearing observed PGR in GRACE data aimed at global viscosity inversion: Weighted Mass Trends technique

AU - Barletta, Valentina Roberta

AU - Bordoni, A.

PY - 2009

Y1 - 2009

N2 - The time-variable gravity field shows the effects of large present-day mass variations associated with hydrological phenomena and melting ice-sheets, resulting in a shaded Post Glacial Rebound (PGR) signal. A meaningful viscosity inversion based on a global scale comparison of GRACE data and PGR predictions is thus hard to obtain. We derive a weighted surface mass distribution in water equivalent, starting from an initial guess, which portrays the secular effects of present-day phenomena. The gravity field it generates is then carefully removed from GRACE data, resulting in a gravity pattern where the effects of PGR are clearer and ready to be compared with the predictions. On the basis of viscoelastic stratified Earth models and different Pleistocene deglaciation models, we show that the quality of a global preliminary viscosity inversion greatly improves.

AB - The time-variable gravity field shows the effects of large present-day mass variations associated with hydrological phenomena and melting ice-sheets, resulting in a shaded Post Glacial Rebound (PGR) signal. A meaningful viscosity inversion based on a global scale comparison of GRACE data and PGR predictions is thus hard to obtain. We derive a weighted surface mass distribution in water equivalent, starting from an initial guess, which portrays the secular effects of present-day phenomena. The gravity field it generates is then carefully removed from GRACE data, resulting in a gravity pattern where the effects of PGR are clearer and ready to be compared with the predictions. On the basis of viscoelastic stratified Earth models and different Pleistocene deglaciation models, we show that the quality of a global preliminary viscosity inversion greatly improves.

U2 - 10.1029/2008GL036429

DO - 10.1029/2008GL036429

M3 - Journal article

VL - 36

SP - 5

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 2

ER -