Influences of Tidal Fronts on Coastal Winds Over an Inland Sea |
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Authors: | Rui Shi Xinyu Guo Hidetaka Takeoka |
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Institution: | (1) National Institute of Oceanography, Dona Paula, Goa, 403 004, India;(2) Space Applications Centre, Ahmedabad, 380 015, India;(3) Indian National Centre for Ocean Information Services, Hyderabad, 500 055, India |
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Abstract: | A regional numerical model of the atmosphere was applied to an inland sea, the Seto Inland Sea in Japan, to study the influence
of sea-surface temperature (SST) variations, accompanied by a tidal front, on the coastal winds in summer when tidal fronts
fully develop. After confirmation of the model performance, two sensitivity simulations, which used spatially uniform SST
with the highest and lowest values over the study area, were performed. The control and sensitivity simulations show that
the mean wind speeds were apparently reduced by the low SST and the SST gradient accompanying the tidal front. The comparison
of the terms in the momentum equations in control and sensitivity simulations indicates that the change of the perturbation
pressure gradient force with the SST gradient is the most important factor in the modification of near-surface winds with
SST variations. When the air flows across a tidal front, the air cools over the low SST area and warms over the high SST area.
Consequently, the surface perturbation pressure increases over the low SST area and decreases over the high SST area. This
adjustment in surface perturbation pressure produces an additional pressure gradient force with direction from the low SST
area to the high SST area that decelerates the surface wind in the area upwind of the tidal front and accelerates the surface
wind downwind of the tidal front. |
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