On the Preferred Period of Upper Wind Fluctuations During the Summer Monsoon

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Abstract
A nonlinear model in a three-component Fourier system is used to investigate the sensitivity of tropospheric response to varying the period of a transient diabatic heat source. The heating perturbation is prescribed as an external forcing with the same amplitude over a wide period range of 8 to 40 days. In the monsoon region the response of upper tropospheric motions is most pronounced in the 12–16 day period range. This preferred period appears to correspond fairly well with that of monsoonal rainfall fluctuations over India. Over the central Pacific, the upper tropospheric response exhibits weak maxima at 12 and 40 days. Abstract A nonlinear model in a three-component Fourier system is used to investigate the sensitivity of tropospheric response to varying the period of a transient diabatic heat source. The heating perturbation is prescribed as an external forcing with the same amplitude over a wide period range of 8 to 40 days. In the monsoon region the response of upper tropospheric motions is most pronounced in the 12–16 day period range. This preferred period appears to correspond fairly well with that of monsoonal rainfall fluctuations over India. Over the central Pacific, the upper tropospheric response exhibits weak maxima at 12 and 40 days.

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