Open AccessSodar studies of gravity waves in the planetary boundary layer at Delhi
Author(s) -
Shubhani Aggarwal,
S. P. Singal,
Shuchita Srivastava
Publication year - 1980
Publication title -
mausam
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.243
H-Index - 12
ISSN - 0252-9416
DOI - 10.54302/mausam.v31i3.3536
Subject(s) - sodar , gravity wave , infragravity wave , planetary boundary layer , wind shear , geology , geophysics , atmospheric sciences , inversion (geology) , meteorology , boundary layer , gravitational wave , physics , longitudinal wave , wind speed , wave propagation , mechanical wave , seismology , mechanics , optics , astrophysics , tectonics
Analysis of sodar echograms for a period of one year (May 19777-April 1978) shows that wavemotions, both simple and complex, occur in the planetary boundary layer at Delhi. The oscillations occur in the boundary layer under conditions of nocturnal radiation inversion, ascending inversion and frontal wind shear.
Auto correlation and power spectral density techniques of wave analysis have been applied to the observed wave motions to study their periodicity. The frequency spectra of the observed waves are reported. The time periods lying mostly within 1-15 Minutes suggest them to be atmospheric gravity waves originating due to the stable restoring force of the density gradients. Wave lengths and scale sizes of the observed waves have been calculated. The scale size of the waves has been found to be small.