• B S Murthy

      Articles written in Journal of Earth System Science

    • Estimation of surface heat flux and inversion height with a Doppler acoustic sounder

      L K Sadani B S Murthy

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      In this paper, acoustic sounder (sodar) derived vertical velocity variance (σw2) and inversion height (Zi) are used to compute the surface heat flux during the convective activity in the morning hours. The surface heat flux computed by these methods is found to be of the same order of magnitude as that obtained from tower measurements. Inversion heights derived from sodar reflectivity profiles averaged for an hour are compared with those obtained from the σw2/Z profile. Variation of σw2 in the mixed layer is discussed. The data were collected during the Monsoon Trough Boundary Layer Experiment 1990 at Kharagpur. The analysis is made for four days which represent the pre-monsoon, onset, active and relatively weak phases of the summer monsoon 1990. The interaction of the ABL with the monsoon activity is studied in terms of the variation of inversion height, vertical velocity variance and surface heat flux as monsoon progresses from June to August.

    • On the influence of spatial heterogeneity on an internal boundary layer at a short fetch

      B S Murthy R Latha Cini Sukumaran A Shivaji S Sivaramakrishnan

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      Surface layer meteorological data collected at a coastal site, at Vasco-Da-Gama (15° 21′N, 73° 51′E, 58.5m MSL) (13–18 July, 2002) with prevailing southwesterly surface winds are analyzed to study the characteristics of internal boundary layer at a short fetch using an instrumented tower (9 m). The spectral and turbulence characteristics of wind are compared with earlier measurements made at a comparatively homogeneous terrain and the standards available in literature. The study show the smaller eddies in the vertical velocity spectrum attains equilibrium with the underlying surface at a short fetch itself and follows spectral similarity. However, this is not followed by longitudinal and transverse velocity spectra under unstable as well as stable conditions.

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