Time Series Analysis of Southwest Monsoon Data from Southeast Asia.
Air Force surveys in geophysics,
AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
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Data from Southeast Asia during the summer monsoons of 1967 and 1968 were studied by time series analysis. Spectral peaks corresponding to a period of about 5 days were found in radar data and in the meridional wind below 500 mb. The cross-spectra of meridional winds between pairs of stations suggested a westward propagation of waves over Southeast Asia with a period of approximately 5 days. Studies by others have revealed similar peaks in the meridional wind over the equatorial Pacific and have related these to westward propagating waves. Even though the summer monsoon differs greatly from the circulation in the equatorial Pacific, both have a tendency for oscillation at a period near 5 days and may be influenced by the same waves. Author Modified Abstract