Thermal internal boundary layer characteristics at a tropical coastal site as observed by a mini-SODAR under varying synoptic conditions |
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| Authors: | Thara V Prabha R Venkatesan Erich Mursch-Radlgruber G Rengarajan N Jayanthi |
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| Institution: | (1) Crop and Soil Sciences, University of Georgia, GA, USA;(2) Health and Safety Division, SHINE Group, IGCAR, 603 102 Kalpakkam, India;(3) Boundary Layer Meteorology Division, Institut fuer Meteorologie und Physik (IMP-BOKU), Wien, Austria;(4) India Meteorological Department, Chennai, India |
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| Abstract: | Atmospheric boundary layer observations are conducted at a coastal site during a transition phase from winter to summer season
over the Indian peninsula. Thermal Internal Boundary Layer (TIBL) characteristics in presence of an off-shore and a weakly
influenced on-shore synoptic wind are examined with the help of measurements carried out with a mini-SODAR (SOund Detection
And Ranging), tethered balloon, and tower-based micrometeorological measurements. Influence of the changing synoptic scale
conditions on turbulent characteristics of TIBL is discussed.
Mini-SODAR data showed the development and decay of sea and land breeze. It is seen that the characteristics of TIBL over
the coastal land after sea breeze onset are similar to that of a shallow convective boundary layer (CBL) commonly found over
plain land. Inside the TIBL, a maximum wind speed was noted close to the surface due to the penetration of sea breeze. In
the off-shore case, a distinct sea breeze circulation was observed unlike in the case of on-shore flow. In the presence of
weak on-shore case, a ‘minor sea’ breeze is noted before the establishment of sea breeze and a reduction in the momentum fluxes
gives rise to decrease in the turbulence intensity. Updraft in the sea breeze front was stronger during weak synoptic conditions.
Influence of synoptic changes on the sea breeze-land breeze circulation such as onset, strength and duration of the sea-land
breeze are also examined.
This work was done while the first author was a visiting scientist at IGCAR, Kalpakkam, India. |
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| Keywords: | Sea breeze thermal internal boundary layer turbulence SODAR |
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