Authors / CoAuthors
Lal, A. | Rattan, V. | Kalouniviti, M. | Begg, Z. | Brown, N. | Thomas, B.
Abstract
<div>The Australian Bureau of Meteorology (BoM), Geoscience Australia (GA) and the Pacific Community (SPC) work together on the Australian Aid funded Pacific Sea Level and Geodetic Monitoring Project (PSLGMP). The project is focused on determining the long-term variation in sea level through observation and analysis of changes in the height of the land (using Global Navigation Satellite System (GNSS) data) and changes in the sea level (using tide gauges managed and operated by the BoM. It is the role of GA and SPC to provide information about ‘absolute’ movement of the tide gauge (managed by BoM) using GNSS to continuously monitor land motion and using levelling (SPC) to measure the height difference between the tide gauge and GNSS pillar every 18 months. </div><div>Land movement caused by earthquakes, subsidence and surface uplift have an important effect on sea level observations at tide gauges. For example, a tide gauge connected to a pier which is subsiding at a rate of 5 mm per year would be observed as a rate of 5 mm per year of sea level rise at the tide gauge. Because of this, it is important to measure, and account for, the movement of land when measuring ‘absolute’ sea level variation - the change in the sea level relative to the centre of the Earth. Relative sea level variation on the other hand is measured relative to local buildings and landmass around the coastline.</div><div>Geoscience Australia’s work enables more accurate 'absolute' sea level estimates by providing observations of land motion which can be accounted for by BoM when analysing the tide gauge data.</div><div><br></div>
Product Type
document
eCat Id
146976
Contact for the resource
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Point of contact
Resource provider
Digital Object Identifier
Keywords
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- geodesy
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- land motion
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- kiribati
- theme.ANZRC Fields of Research.rdf
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- Earth system sciences
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- Published_External
Publication Date
2022-08-17T07:33:46
Creation Date
2022-06-25T12:00:00
Security Constraints
Legal Constraints
Status
completed
Purpose
Describes the vertical motion of the tide gauge in Kiribati
Maintenance Information
asNeeded
Topic Category
geoscientificInformation
Series Information
GA Record GA Record 2022/24
Lineage
<div>This report provides the results of the GNSS monument monitoring survey & high precision level survey completed between the Sea Level Fine Resolution Acoustic Measuring Equipment (SEAFRAME) tide gauge and the GNSS Continuously Operation Reference Station (CORS) in Tarawa, Kiribati from 9th – 19th December 2019. It also provides an updated height of the tide gauge derived from GNSS time series analysis and precise levelling observations. </div><div><br></div>
Parent Information
Extents
[-4.00, -3.00, 169.00, 168.00]
Reference System
Spatial Resolution
Service Information
Associations
Source Information