Open Access Digital Repository of Ministry of Earth Sciences, Government of India

Diurnal and seasonal variability of TKE dissipation rate in the ABL over a tropical station using UHF wind profiler

Kalapureddy, MCR and Kishore Kumar, K and Sivakumar, V and Ghosh, AK and Jain, AR and Krishna Reddy, K (2007) Diurnal and seasonal variability of TKE dissipation rate in the ABL over a tropical station using UHF wind profiler. Journal of Atmospheric and Solar-Terrestrial Physics, 69 (4-5). pp. 419-430.

Full text not available from this repository. (Request a copy)

Abstract

This paper presents the diurnal and seasonal variation of Turbulence Kinetic Energy (TKE) dissipation rate (ε) in the Atmospheric Boundary-Layer (ABL) over a tropical station, Gadanki (13.5° N, 79.2° E) in India. Doppler spectral width measurements made by Lower Atmospheric Wind Profiler (LAWP) operating at 1357 MHz are utilized to estimate ε in the height region of 0.5-4.0 km on clear air days. Various non-turbulent spectral broadenings are calculated and separated out from the observed spectral width before estimating ε. It is found that in the lower tropospheric height region ε is in the range from 10-5.0 to 10-1.0 m2 s-3. ε showed significant diurnal variation in the boundary-layer. The larger values of ε, 10-2.7 m2 s-3, are noted to be associated with the Convective Boundary-Layer (CBL). The parameter ε is also showing significant seasonal variation. In summer and monsoon seasons the boundary-layer depths are observed up to a height of 4.0 km while the same are confined to below 2.0 km in post-monsoon and winter seasons.

Item Type: Article
Additional Information: Copyright of this article belongs to Elsevier.
Uncontrolled Keywords: Atmospheric turbulence; Boundary layers; Climate change; Doppler radar; Meteorological instruments; Meteorological radar; Troposphere, Atmospheric Boundary-Layer (ABL); Lower Atmospheric Wind Profiler (LAWP); Turbulence Kinetic Energy (TKE), Meteorology
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 01 Jan 2015 10:58
Last Modified: 01 Jan 2015 10:58
URI: http://moeseprints.incois.gov.in/id/eprint/1903

Actions (login required)

View Item View Item