A study of the fluctuations of the wind field over the tropical Indian Ocean
Abstract
Using radiosonde data from six widely scattered stations
in the Indian Ocean, an attempt was made to identify
quasi-periodic wind oscillations during the 1973-197^
winter monsoon season. The data were analyzed using spectrum
analysis and time cross-section analysis techniques.
In general, the results of the power spectra computed
show a seven-day peak which seems most significant. A fourfive
day peak and a thirteen-day peak were also found at some
stations. The cross-spectrum analysis shows little correlation
of the peaks, indicating uncertainty in the significance
of the spectral results.
The results of the time cross-section analysis, done
over two one-month periods, indicate a possible fluctuation
time scale of 10-20 days at most stations; and in many cases,
the fluctuations appear to propagate downward.
Due to the low density of available stations and the
poor quality of the data, the results are considered very
tentative. Further study is suggested, but only after the
quality of the data can be improved.
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