Sea Level Variation around Australia and Its Relation to Climate Indices

Armin Agha Karimi*, Xiaoli Deng, Ole Baltazar Andersen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

This study aims at investigating the intradecadal and decadal signals of the sea level using 25 years of altimetry data around Australia. We have used the multivariable spectral analysis to extract six periodic signals at the 95% confidence level from altimetry-derived sea-level time series in the study area. They are signals with periods of 1, 1.5, 3, 4.3, 5.7 and 11.17 years, which can also be detected in the estimated power spectra from climate indices of the Interdecadal Pacific Oscillation, Multivariate ENSO Index, and Pacific Decadal Oscillation. A parametric model including the detected periodic signals is used to estimate sea-level trends. The determined trends in the area are in a good agreement with recent studies that consider effects of climate indices through a multivariate regression model. The advantage of our model is to present more descriptive explanation of the sea level signals around Australia in terms of periodicity and spatial variability.
Original languageEnglish
JournalMarine Geodesy
Volume42
Issue number5
Pages (from-to)469-489
ISSN0149-0419
DOIs
Publication statusPublished - 2019

Keywords

  • Australia
  • Climate indices
  • Regional sea level change
  • Satellite altimetry
  • Sea level spectral analysis
  • Oceanography

Cite this

Agha Karimi, Armin ; Deng, Xiaoli ; Andersen, Ole Baltazar. / Sea Level Variation around Australia and Its Relation to Climate Indices. In: Marine Geodesy. 2019 ; Vol. 42, No. 5. pp. 469-489.
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title = "Sea Level Variation around Australia and Its Relation to Climate Indices",
abstract = "This study aims at investigating the intradecadal and decadal signals of the sea level using 25 years of altimetry data around Australia. We have used the multivariable spectral analysis to extract six periodic signals at the 95{\%} confidence level from altimetry-derived sea-level time series in the study area. They are signals with periods of 1, 1.5, 3, 4.3, 5.7 and 11.17 years, which can also be detected in the estimated power spectra from climate indices of the Interdecadal Pacific Oscillation, Multivariate ENSO Index, and Pacific Decadal Oscillation. A parametric model including the detected periodic signals is used to estimate sea-level trends. The determined trends in the area are in a good agreement with recent studies that consider effects of climate indices through a multivariate regression model. The advantage of our model is to present more descriptive explanation of the sea level signals around Australia in terms of periodicity and spatial variability.",
keywords = "Australia, Climate indices, Regional sea level change, Satellite altimetry, Sea level spectral analysis, Oceanography",
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Sea Level Variation around Australia and Its Relation to Climate Indices. / Agha Karimi, Armin; Deng, Xiaoli; Andersen, Ole Baltazar.

In: Marine Geodesy, Vol. 42, No. 5, 2019, p. 469-489.

Research output: Contribution to journalJournal articleResearchpeer-review

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AU - Agha Karimi, Armin

AU - Deng, Xiaoli

AU - Andersen, Ole Baltazar

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N2 - This study aims at investigating the intradecadal and decadal signals of the sea level using 25 years of altimetry data around Australia. We have used the multivariable spectral analysis to extract six periodic signals at the 95% confidence level from altimetry-derived sea-level time series in the study area. They are signals with periods of 1, 1.5, 3, 4.3, 5.7 and 11.17 years, which can also be detected in the estimated power spectra from climate indices of the Interdecadal Pacific Oscillation, Multivariate ENSO Index, and Pacific Decadal Oscillation. A parametric model including the detected periodic signals is used to estimate sea-level trends. The determined trends in the area are in a good agreement with recent studies that consider effects of climate indices through a multivariate regression model. The advantage of our model is to present more descriptive explanation of the sea level signals around Australia in terms of periodicity and spatial variability.

AB - This study aims at investigating the intradecadal and decadal signals of the sea level using 25 years of altimetry data around Australia. We have used the multivariable spectral analysis to extract six periodic signals at the 95% confidence level from altimetry-derived sea-level time series in the study area. They are signals with periods of 1, 1.5, 3, 4.3, 5.7 and 11.17 years, which can also be detected in the estimated power spectra from climate indices of the Interdecadal Pacific Oscillation, Multivariate ENSO Index, and Pacific Decadal Oscillation. A parametric model including the detected periodic signals is used to estimate sea-level trends. The determined trends in the area are in a good agreement with recent studies that consider effects of climate indices through a multivariate regression model. The advantage of our model is to present more descriptive explanation of the sea level signals around Australia in terms of periodicity and spatial variability.

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KW - Regional sea level change

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KW - Sea level spectral analysis

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