Simulation of Atmospheric Boundary Layer Characteristics during Indian Summer Monsoon using Observations from Monsoon Trough Boundary Layer Experiment at Jodhpur, India |
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| Authors: | T V B P S Rama Krishna Maithili Sharan |
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| Institution: | (1) EIRA Division, National Environmental Engineering Research Institute, Nehru Marg, Nagpur, 440 020, India;(2) Centre for Atmospheric Sciences, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110 016, India |
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| Abstract: | The diurnal structure of the boundary layer during Indian summer monsoon period is studied using a one-dimensional meteorological
boundary layer model and the observations collected from the Monsoon Trough Boundary Layer Experiment conducted in 1990 at
Jodhpur, India. The model was initialized with the observed temperature profiles at 0530 LST on 17 July, 1990 at Jodhpur and
was run for 26 hours. The study is carried out with a geostrophic wind speed of 9.5 m s−1 corresponding to the strong wind simulation. The mean thermodynamic and wind structure simulated by the model are in good
agreement with those observed from 30 m tower. The computed surface layer characteristics such as the surface fluxes, TKE
and standard deviations of velocity components are found to be reasonably in good agreement with those based on turbulence
measurements. The shear and buoyancy budget computed from the model are also compared with the turbulence measurements. The
integrated cooling budget in the nocturnal boundary layer is examined. |
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| Keywords: | Surface fluxes turbulence measurements shear buoyancy turbulent kinetic energy integrated cooling budget |
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