Eddy detection over southern Indian ocean using TOPEX/POSEIDON altimeter data

Gairola, R. M. ; Basu, Sujit ; Pandey, P. C. (2001) Eddy detection over southern Indian ocean using TOPEX/POSEIDON altimeter data Marine Geodesy, 24 (2). pp. 107-121. ISSN 0149-0419

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Official URL: http://www.tandfonline.com/doi/abs/10.1080/0149041...

Related URL: http://dx.doi.org/10.1080/01490410119136


Mesoscale eddies constitute the most energetic component of the variability of ocean currents. An attempt has been made for the detection of oceanic mesoscale eddy signatures over the Southern Indian Oceanic (SIO) regions using the dynamic topography derived from TOPEX/POSEIDON (T/P) altimeter data, by the signal processing technique, called matched filtering. After applying all the ocean and atmospheric corrections, data of a complete cycle of T/P over SIO has been used for detection of eddy signatures. The geoid undulations are removed from the data of corrected sea surface height from T/P and the resulting dynamic topographic data are passed through a matched filter designed to detect a generic eddy signature of Gaussian signal embedded in noise. The filter is optimized to detect eddies with amplitude 20 to 30 cm and diameters roughly 100?250 km. Out of all the analyzed data of T/P orbits over SIO a few examples are presented for brevity. Qualitative verification of eddies is done with some independent T/P sea level anomaly data over the region. The analysis shows that the matched filtering technique is most suitable for monitoring eddy signatures along the subsatellite track instantly over the remote and most hostile regions of the southern global oceans.

Item Type:Article
Source:Copyright of this article belongs to Taylor and Francis Group.
Keywords:Altimeter; Eddy; Topex; Poseidon Signal Processing; Southern Indian Ocean
ID Code:94459
Deposited On:16 Nov 2012 12:28
Last Modified:16 Nov 2012 12:28

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