Surface boundary-layer characteristics over a tropical inland station: Seasonal features

• Published in: Boundary-layer meteorology Vol. 111; no. 1; pp. 153 - 175
• Main Authors: MUVVA VENKATA RAMANA, KRISHNAN, Praveena, KUNHIKRISHNAN, P. K
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer 01.04.2004; Springer Nature B.V
• Subjects: Convection, turbulence, diffusion. Boundary layer structure and dynamics; Earth, ocean, space; Exact sciences and technology; External geophysics; Meteorology; Wind; India; India, Uttar Pradesh, Lucknow; experimental studies; Relative humidity; meteorology; Surface layer; Parameter variation; Wind velocity; Similarity theory; Specific humidity; Fluxes; troposphere; turbulence; Easterly wind; Turbulence statistics; diurnal variations; Asia; Atmospheric boundary layer; Atmospheric surface layer; monsoons; seasonal variations
• ISSN: 0006-8314; 1573-1472
• DOI: 10.1023/B:BOUN.0000010999.25921.1a

Some characteristic features of the atmospheric surfacelayer over an inland tropical station, Lucknow (27°N, 81°E)in India, are investigated for different seasons using micrometeorological data collected at the 10-m levelof an instrumented tower. Seasonal monsoonal variations in wind circulation (north-easterliesand south-westerlies) dominate the flow over this part of the region. This study utilizesthe wind, temperature and humidity data obtained for a period of one year from February 1996 to January 1997. The diurnal variation of mean parameterssuch as temperature, relative humidity, and wind speed are studied for different seasonsnamely pre-, south-west, post- and north-east monsoon periods. Turbulent statistics are computedusing the eddy correlation technique, and are studied under the framework of Monin-Obukhov similarity theory with results compared with otherexperimental studies reported in the literature. It is found that the turbulence statistics arenearly independent of season and the near-neutral values of the normalized standard deviations ofthe three wind components, temperature and specific humidityare found to be 1.00 ± 0.04 (vertical), 2.63 ± 0.36(longitudinal), 2.19 ± 0.06 (lateral), 6.56 ± 0.33and 6.45 ± 0.33 respectively.[PUBLICATION ABSTRACT]