Seasonal Characteristics of Atmospheric Boundary Layer and its Associated Dynamics over Central India

  • Hareef baba shaeb KannemaduguEmail author
Original Article


Atmospheric boundary-layer studies have applications in lower tropospheric processes, air pollution meteorology, weather prediction and climate monitoring. Despite this, very few studies are available over tropics, especially over central India. Here, we analyse, high resolution vertical profiles of meteorological parameters corresponding to fully developed mixed layer obtained using balloon borne radiosonde to study characteristics of atmospheric boundary layer over Nagpur (21.15 °N, 79.15 °E). Study reveals that, within the mixed layer, variation in RH is very less (within 20%) while above mixed layer, large variations are seen. Back trajectory analysis confirms that the moist days (dry days) are associated with the transport of air masses from the Arabian Sea (from arid locations). Mixed layer heights derived through gradients in Virtual Potential Temperature (VPT) showed highest values during Pre monsoon (2564 ± 867 m) and lowest (788 ± 477 m) in Monsoon season. Specific Humidity varies in the range from 0 to 10 g/kg during pre-monsoon and 0–20 g/kg during monsoon season. D-theta exhibits lowest values in monsoon and highest values during pre-monsoon season while Parcel saturation pressure difference exhibits highest values in monsoon and lowest values during pre-monsoon season. During the monsoon and early post monsoon there is a presence of high moist static energy (Theta-e ~ 365 K) at the surface and moderate during mid-winter. We have examined, for the first time, the spatial (vertical) coherence of VPT using a novel technique of auto correlation analysis. Coherence length scales, derived with this method are found to be Maximum (1129 ± 48 m) in winter and minimum (694 ± 281 m) in Pre monsoon season.


Atmospheric boundary layer Coherence length scale Radiosonde Mixed layer height moisture 



Radiosonde measurements were done as a part of Aerosol Radiative Forcing over India project of ISRO-Geosphere Biosphere Program. Present study is done as a part of Radiosonde Network for NICES (RANN) project. We are grateful to NOAA Air Resources Laboratory (ARL) for the provision of the HYSPLIT transport and dispersion model through their website We thank Dr. Dibyendu Dutta, Group Director, Climate Sciences Group, Dr. M.V.R.Seshasai, Deputy Director, Earth and Climate Science Area and Director, NRSC for the support and encouragement towards this study.


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© Korean Meteorological Society and Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Earth and Climate Science AreaNational Remote Sensing Centre (Department of Space –Government of India)ShadnagarIndia

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