A case study of atmospheric boundary layer features during winter over a tropical inland station — Kharagpur (22.32°N, 87.32°E) |
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| Authors: | Denny P Alappattu P K Kunhikrishnan Marina Aloysius M Mohan |
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| Institution: | (1) Lab. of Meterology, Department of Applied Physics, National and Kapodistrian University of Athens, Build. Phys. V., University Campus, 157 84 Athens, Greece;(2) Institute for Environmental Research and Sustainable Development, National Observatory of Athens, Lofos Koufou, Penteli, 152 36 Athens, Greece;(3) Department of Geography, University of the Aegean, 811 00 Mytilene, Greece |
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| Abstract: | The local weather and air quality over a region are greatly influenced by the atmospheric boundary layer (ABL) structure and
dynamics. ABL characteristics were measured using a tethered balloon-sonde system over Kharagpur (22.32°N, 87.32°E, 40m above
MSL), India, for the period 7 December 2004 to 30 December 2004, as a part of the Indian Space Research Organization-Geosphere
Biosphere Program (ISRO-GBP) Aerosol Land Campaign II. High-resolution data of pressure, temperature, humidity, wind speed
and wind direction were archived along with surface layer measurements using an automatic weather station. This paper presents
the features of ABL, like ABL depth and nocturnal boundary layer (NBL) depth. The sea surface winds from Quikscat over the
oceanic regions near the experiment site were analyzed along with the NCEP/NCAR reanalysis winds over Kharagpur to estimate
the convergence of wind, moisture and vorticity to understand the observed variations in wind speed and relative humidity,
and also the increased aerosol concentrations. The variation of ventilation coefficient (V C), a factor determining the air pollution potential over a region, is also discussed in detail. |
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