Journal
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
Volume 120, Issue 10, Pages 7004-7014Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015JC011295
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Funding
- Australian Research Council [LP110100284, LP140100155]
- Landgate (the Western Australian geodetic agency)
- Curtin University of Technology
- Western Australian Department of Water
- Australian Research Council [LP110100284, LP140100155] Funding Source: Australian Research Council
- Natural Environment Research Council [noc010012] Funding Source: researchfish
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A combination of independent evidence (continuous GPS, repeat geodetic leveling, groundwater abstraction, satellite altimetry, and tide gauge (TG) records) shows that the long-recording Fremantle TG has been subsiding in a nonlinear way since the mid-1970s due to time-variable groundwater abstraction. The vertical land motion (VLM) rates vary from approximately -2 to -4 mm/yr (i.e., subsidence), thus producing a small apparent acceleration in mean sea level computed from the Fremantle TG records. We exemplify that GPS-derived VLM must be geodetically connected to the TG to eliminate the commonly used assumption that there is no differential VLM when the GPS is not colocated with the TG. In the Perth Basin, we show that groundwater abstraction can be used as a diagnostic tool for identifying nonlinear VLM that is not evident in GPS time series alone.
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