An assessment of theICE6G_C(VM5a)glacial isostatic adjustment model

dc.contributor.authorPurcell, A.
dc.contributor.authorTregoning, P.
dc.contributor.authorDehecq, A.
dc.date.accessioned2016-09-09T04:05:08Z
dc.date.issued2016-05-01
dc.description.abstractThe recent release of the next-generation global ice history model, ICE6G_C(VM5a), is likely to be of interest to a wide range of disciplines including oceanography (sea level studies), space gravity (mass balance studies), glaciology, and, of course, geodynamics (Earth rheology studies). In this paper we make an assessment of some aspects of the ICE6G_C(VM5a) model and show that the published present-day radial uplift rates are too high along the eastern side of the Antarctic Peninsula (by ∼8.6 mm/yr) and beneath the Ross Ice Shelf (by ∼5 mm/yr). Furthermore, the published spherical harmonic coefficients—which are meant to represent the dimensionless present-day changes due to glacial isostatic adjustment (GIA)—contain excessive power for degree ≥90, do not agree with physical expectations and do not represent accurately the ICE6G_C(VM5a) model. We show that the excessive power in the high-degree terms produces erroneous uplift rates when the empirical relationship of Purcell et al. (2011) is applied, but when correct Stokes coefficients are used, the empirical relationship produces excellent agreement with the fully rigorous computation of the radial velocity field, subject to the caveats first noted by Purcell et al. (2011). Using the Australian National University (ANU) groups CALSEA software package, we recompute the present-day GIA signal for the ice thickness history and Earth rheology used by Peltier et al. (2015) and provide dimensionless Stokes coefficients that can be used to correct satellite altimetry observations for GIA over oceans and by the space gravity community to separate GIA and present-day mass balance change signals. We denote the new data sets as ICE6G_ANU.en_AU
dc.identifier.issn2169-9313en_AU
dc.identifier.urihttp://hdl.handle.net/1885/108711
dc.provenancehttp://www.sherpa.ac.uk/romeo/issn/2169-9313/..."Publisher's version/PDF must be used in Institutional Repository 6 months after publication." from SHERPA/RoMEO site (as at 9/09/16).
dc.publisherAmerican Geophysical Union (AGU)en_AU
dc.rights© 2016. American Geophysical Union.en_AU
dc.sourceJournal of Geophysical Research: Solid Earthen_AU
dc.subjectglacio-isostatic adjustmenten_AU
dc.subjectGRACEen_AU
dc.subjectgravityen_AU
dc.subjectice historyen_AU
dc.subjectvertical upliften_AU
dc.titleAn assessment of theICE6G_C(VM5a)glacial isostatic adjustment modelen_AU
dc.typeJournal articleen_AU
dcterms.accessRightsOpen Accessen_AU
local.bibliographicCitation.issue5en_AU
local.bibliographicCitation.lastpage3950en_AU
local.bibliographicCitation.startpage3939en_AU
local.contributor.affiliationPurcell, A., Research School of Earth Sciences, The Australian National Universityen_AU
local.contributor.affiliationTregoning, P., Research School of Earth Sciences, The Australian National Universityen_AU
local.contributor.affiliationDehecq, A., Research School of Earth Sciences, The Australian National Universityen_AU
local.contributor.authoremailanthony.purcell@anu.edu.auen_AU
local.contributor.authoruidU8903837en_AU
local.identifier.citationvolume121en_AU
local.identifier.doi10.1002/2015JB012742en_AU
local.identifier.uidSubmittedByu1005913en_AU
local.publisher.urlhttp://sites.agu.org/en_AU
local.type.statusPublished Versionen_AU

Downloads

Original bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
01_Purcell_An_Assessment_2016.pdf
Size:
3.87 MB
Format:
Adobe Portable Document Format
Description:

License bundle

Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
884 B
Format:
Item-specific license agreed upon to submission
Description:
Back to topicon-arrow-up-solid
 
APRU
IARU
 
edX
Group of Eight Member

Acknowledgement of Country

The Australian National University acknowledges, celebrates and pays our respects to the Ngunnawal and Ngambri people of the Canberra region and to all First Nations Australians on whose traditional lands we meet and work, and whose cultures are among the oldest continuing cultures in human history.


Contact ANUCopyrightDisclaimerPrivacyFreedom of Information

+61 2 6125 5111 The Australian National University, Canberra

TEQSA Provider ID: PRV12002 (Australian University) CRICOS Provider Code: 00120C ABN: 52 234 063 906