High variability in cross-shore thermally driven exchange

The variability of cross-shore thermally driven exchange was examined using ensemble averages of observations from the Kilo Nalu Observatory on the south shore of Oahu Hawaii. The cross-shore vertical shear, top-bottom temperature difference, and cross-shore advective heat flux were analyzed to evaluate the influence of the surface heat flux, the cross-shore wind and the M2 tide in the cross-shore exchange variability. The M2 affects the exchange through the effects of tidally driven alongshore flow on turbulent diffusivity and on Coriolis driven cross-shore accelerations. Lunar phase ensemble averages are compared with a theoretical model to show that the interaction of the diurnal wind pattern and the tidally driven alongshore flow can lead to significant cross-shore exchange variability at sub-diurnal time scales.


Presented at:
VIIIth International Symposium on Stratified Flows, San Diego, USA, August 29 - September 1, 2016
Year:
2016
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 Record created 2017-03-14, last modified 2018-03-17

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