Temperature oscillations in the upper thermocline region- A case study on internal waves off Kalpeni Island in the southern Arabian Sea

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dc.contributor.author Charyulu, R.J.K.
dc.contributor.author Sarma, Y.V.B.
dc.contributor.author Sarma, M.S.S.
dc.contributor.author Rao, L.V.G.
dc.date.accessioned 1994-04-25T10:06:26Z
dc.date.accessioned 2017-09-30T01:56:28Z
dc.date.available 1994-04-25T10:06:26Z
dc.date.available 2017-09-30T01:56:28Z
dc.date.issued 1994
dc.identifier.citation Indian Journal of Marine Sciences, vol.23(1); 1994; 14-17
dc.identifier.issn 0379-5136
dc.identifier.uri http://drs.nio.org/drs/handle/2264/7447
dc.description.abstract Temperature 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.language en
dc.publisher CSIR-NISCAIR
dc.relation.ispartof Indian J Mar Sci
dc.relation.isreferencedby SCI
dc.subject Oceanography and Limnology
dc.subject.other internal waves
dc.subject.other oscillations
dc.subject.other thermocline
dc.subject.other Brunt-Vaisala frequency
dc.subject.other temperature data
dc.subject.other ISW, Arabian Sea, Kalpeni I.
dc.title Temperature oscillations in the upper thermocline region- A case study on internal waves off Kalpeni Island in the southern Arabian Sea
dc.type Journal Article
dc.affiliation.author CSIR-National Institute of Oceanography, Dona Paula, Goa, India


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