Trends and the pole tide in Indian tidegauge records |
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Authors: | P K Das M Radhakrishna |
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Institution: | (1) Department of Ocean Development, C.G.O. Complex, Lodi Road, 110 003 New Delhi, India |
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Abstract: | This paper studies tidegauge records of stations on the Indian coastline. An analysis of trends did not reveal a monotonie
trend. Trends were seen for limited periods at only five of the eight stations on the Indian coast. A spectral analysis of
annual records produced evidence of long period cycles with shorter cycles riding on them. The shorter cycles had a period
of 5.0 years. The spectra of monthly records revealed evidence of a pole tide and an annual cycle. The amplitude of the pole
tide was estimated to be around 7.5 mm. This was larger than the equilibrium tide. A spectral analysis of monthly rainfall
at Bombay, a station on the Indian west coast, also showed a 13.9 month cycle and a (3,1,0) autoregressive model. But the
coherence between monthly rainfall and relative sealevel fluctuations was low. |
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Keywords: | Trends sealevel spectral analysis pole tide |
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