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Title: Power Spectral Analysis of Lower Stratospheric Meteorological Data of H, T, u & v
Authors: Reddy, S Jeevananda
Lahori, (Miss) S N
Issue Date: Mar-1977
Publisher: NISCAIR-CSIR, India
Abstract: The monthly mean data of dynamic height of constant pressure surfaces (H), temperatures (T) and eastward (u) and northward (v) velocities of wind at 100, 50 and 30 mbar levels from eleven equatorial stations in the latitude belt of 13° '5N to 12°'0S have been subjected to power spectrum and harmonic analyses. The results show that the prominent cycles are annual and multiples of annual. The auto-correlation values show multiples of six months with odd and even multiples, with respectively negative and positive auto-correlations (except in the case of zonal component of wind, where annual cycle shows negative and biennial cycle positive auto-correlation). It is inferred that the annual and semi-annual components of temperature are of the same origin, i.e. solar radiation. The discrepancies observed in the different periods of oscillation during the 10-yr period are attributed to the fifth harmonic of sunspot cycle acting in unison with the multiple mode of annual cycle, where higher modes are prominent at low sunspot activity and lower modes at high sunspot activity.
Page(s): 51-59
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.06(1) [March 1977]

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