Spatial pattern and temporal variability of sea level anomaly and geostrophic current in the Eastern Indian Ocean from satellite altimetry

Saputra Julian, . and Lumban-Gaol Jonson, . and Panjaitan James Parlindungan, . and Atmadipoera Agus Saleh, . Spatial pattern and temporal variability of sea level anomaly and geostrophic current in the Eastern Indian Ocean from satellite altimetry. pp. 2281-2304. ISSN 2231-8526

The Eastern Indian Ocean has complex dynamic circulation systems affected by monsoonal wind circulation and climate variation. This research aimed to investigate the spatial and temporal variability of the sea level and the geostrophic currents in the Eastern Indian Ocean using altimeter data. We used daily time series sea level anomaly data from 2004-2016 and applied time-series analysis of EOF. The highest four-modes were adopted. Both sea level anomaly and geostrophic zonal component had the sum of explained variance with 79.68 and 35.65 respectively. The spatial pattern of the sea level anomaly showed dominant variability spread around the west coast of Sumatra and south coast of Java with positive and negative anomalies as shown in first and second modes while the third and the fourth mode did not show substantial spatial variability. The dominant temporal variation revealed semi-annual annual and inter-annual periodicity. Furthermore for the geostrophic zonal current spatial pattern in the first to third modes showed high variability around the west coast of Sumatra and south coast of Java while in the offshore region they showed positive-negative anomalies. In the fourth mode the spatial pattern showed low variability. The dominant temporal variation revealed annual semi-annual and inter-annual periodicity. Based on the spatial and temporal variation of the data the variability in the study area might be associated with the dynamic of coastally trapped Kelvin wave upwelling and an interannual anomaly of IOD and ENSO. It was also noticed that some patterns indicated as dynamic of SJC and SEC signals.

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Abstract

The Eastern Indian Ocean has complex dynamic circulation systems affected by monsoonal wind circulation and climate variation. This research aimed to investigate the spatial and temporal variability of the sea level and the geostrophic currents in the Eastern Indian Ocean using altimeter data. We used daily time series sea level anomaly data from 2004-2016 and applied time-series analysis of EOF. The highest four-modes were adopted. Both sea level anomaly and geostrophic zonal component had the sum of explained variance with 79.68 and 35.65 respectively. The spatial pattern of the sea level anomaly showed dominant variability spread around the west coast of Sumatra and south coast of Java with positive and negative anomalies as shown in first and second modes while the third and the fourth mode did not show substantial spatial variability. The dominant temporal variation revealed semi-annual annual and inter-annual periodicity. Furthermore for the geostrophic zonal current spatial pattern in the first to third modes showed high variability around the west coast of Sumatra and south coast of Java while in the offshore region they showed positive-negative anomalies. In the fourth mode the spatial pattern showed low variability. The dominant temporal variation revealed annual semi-annual and inter-annual periodicity. Based on the spatial and temporal variation of the data the variability in the study area might be associated with the dynamic of coastally trapped Kelvin wave upwelling and an interannual anomaly of IOD and ENSO. It was also noticed that some patterns indicated as dynamic of SJC and SEC signals.

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Item Type:	Article
AGROVOC Term:	Satellites
AGROVOC Term:	Oceanography
AGROVOC Term:	Research
AGROVOC Term:	Time series analysis
AGROVOC Term:	Sea level
AGROVOC Term:	Sea water
AGROVOC Term:	Eastern Indian Ocean
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:55
URI:	http://webagris.upm.edu.my/id/eprint/9465

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