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dc.contributor.authorCharyulu, R.J.K.
dc.contributor.authorSarma, Y.V.B.
dc.contributor.authorSarma, M.S.S.
dc.contributor.authorRao, L.V.G.
dc.identifier.citationIndian Journal of Marine Sciences, vol.23(1); 1994; 14-17
dc.description.abstractTemperature data were collected for 12 h in the thermocline region at an oceanic station off Kalpeni Island (11~'15'N and 69'E) from the stationary ship using a thermistor chain. These data were Fast Fourier Transformed (FFT) to examine the spectral characteristics of the temperature oscillations. The power spectra of temperature fluctuations at 11 depths in the upper thermocline from 80 to 100 m with 2 m interval, were computed for studying the short period internal waves. Power spectra density was higher at 90 m at all frequencies compared to that at above or below this depth. An abrupt change in the degree of coherence occured at 88 m depth, in the sense that the oscillations above 88 m showed very low degree of coherence, while below 88 m depth the oscillations show very high degree of coherence. The low frequency oscillations (0.01667 to 0.2167 cpm) had higher coherence and very small phase shift whereas, high frequency oscillations (> 0.2167 cpm) had rather poor coherence and a large phase difference. Analysis of the coherence relations of the power spectral densities showed that the internal waves of periods longer than 10 min had higher coherence below 88 m depth
dc.relation.ispartofIndian J Mar Sci
dc.subjectOceanography and Limnology
dc.subject.otherinternal waves
dc.subject.otherBrunt-Vaisala frequency
dc.subject.othertemperature data
dc.subject.otherISW, Arabian Sea, Kalpeni I.
dc.titleTemperature oscillations in the upper thermocline region- A case study on internal waves off Kalpeni Island in the southern Arabian Sea
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India

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