Impact of Annular Solar Eclipse of 15 January 2010 on the Atmospheric Boundary Layer Characteristics Over Thumba: A Case Study |
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Authors: | Email author" target="_blank">D?Bala SubrahamanyamEmail author T?J?Anurose Mannil?Mohan M?Santosh N?V?P?Kiran Kumar S?Sijikumar |
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Institution: | (1) Space Physics Laboratory, Vikram Sarabhai Space Centre, Department of Space, Government of India, Indian Space Research Organization, Thiruvananthapuram, 695 022, Kerala, India |
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Abstract: | On 15 January 2010, Thumba (8.5°N, 76.9°E) witnessed one of the longest known noontime annular solar eclipses (ASEs) spanning
a period of about 7 min, centered at 1314 hours local time. In this research article, we present a case study on the behaviour
of the atmospheric boundary layer characteristics and its vertical structure in response to this rare celestial event by making
use of a suite of different in-situ instruments. During the peak period of the ASE, the incoming solar irradiance was dimmed
by about 87% of its normal values, resulting in a significant reduction in the magnitudes of turbulent kinetic energy and
surface-layer turbulent fluxes of heat and momentum. The intensity and vertical thickness of the sea/land breeze circulation
cell over the study domain also weakened. However, the mixed layer heights determined from balloon-borne GPS Radiosonde did
not show any appreciable changes. Analysis of vertical profiles of thermodynamic parameters in association with the wind direction
during ASE indicated the formation of a double mixed layer between 700 and 1500 m and is attributed to horizontal advection
of a different airmass at those altitudes. |
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