Authors / CoAuthors
Jia, M.
Abstract
We analyse 11 years data from nine continuous GPS receivers distributed over Antarctica to determine vertical crustal motion. The vertical velocities determined by GPS in the latest reference frame IGS05 (a realization of the reference frame ITRF2005) are transformed to the reference frame CE2007 (Argus 2007 GJI) as the centre of mass of the Earth is constrained poorly by SLR in ITRF2005. Uncertainties of the vertical velocities are estimated using combined white and flicker models. Two GPS stations O'Higgins and Palmer in the north Antarctic Peninsula, show uplifts of +6.7 2.4 mm/yr and +5.4 1.7 mm/yr respectively. GPS station Vesleskarvet in Queen Maud Land shows uplift of +1.7 0.8 mm/yr. Recent GRACE research shows ice loss rates of -28.8 7.9 km /yr in the north Antarctic Peninsula and -16.7 9.7 km /yr in Queen Maud Land. The GPS station Casey shows uplift of +1.3 0.7 mm/yr where some ice loss is also indicated by GRACE data. Therefore, the signs of the results from GPS are consistent with the signs of results from GRACE. On the other hand, subsidence of -0.7 0.4 mm/yr is detected at GPS stations Mawson and Davis in East Antarctica where a mass accumulation rate of +21 11 km /yr has been detected by GRACE data. The signs of these results from GPS and GRACE are also consistent. In addition, no significant vertical crustal changes have been detected at GPS stations Dumont d'Urville and McMurdo where no significant mass changes have been detected from GRACE data. We conclude that our GPS analysis results can detect crustal vertical motion very accurately and the signs of GPS results are consistent with the signs of mass changes in Antarctica detected by GRACE.
Product Type
nonGeographicDataset
eCat Id
65808
Contact for the resource
Custodian
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
-
- GA Publication
- ( Theme )
-
- deformation
- ( Theme )
-
- geodesy
- ( Theme )
-
- Antarctic data
-
- AQ
- Australian and New Zealand Standard Research Classification (ANZSRC)
-
- Earth Sciences
-
- Published_Internal
Publication Date
2008-01-01T00:00:00
Creation Date
Security Constraints
Legal Constraints
Status
Purpose
Maintenance Information
unknown
Topic Category
geoscientificInformation
Series Information
Lineage
Unknown
Parent Information
Extents
Reference System
Spatial Resolution
Service Information
Associations
Downloads and Links
Source Information
Source data not available.