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Diurnal Sea Breeze Effects on Nearshore Temperature Variability in Southern Monterey Bay

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Technical Report

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Naval Postgraduate School Monterey 93943 United States

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Forty-five days of co-located temperature and velocity profiles were obtained from two cross-shore arrays spanning between water depths of 5m and 10m 100m in the cross-shore and 150m in the alongshore off Del Monte Beach, CA in southern Monterey Bay. A canonical day, based on local time, is chosen due to the occurrence of diurnal sea breeze that is commonly observed in the bay. Under relatively weak cross-shore wind- 0.03 Pa and wave-forcing Hrms0.5m, afternoon temperatures warm 1.5C in5m and 10m water depths. The cross-shore heat flux CHF reaches a maximum of 4x105Wm in the afternoon in 10m water depth, while the CHF remains at zero throughout the day in 5m water depth. The relative difference in water temperature between 5m and 10m water depths results in 0.5C increase at 5mand corresponds with the trends in CHF. During night, under minimal wind forcing, the CHF at 10m water depth decreases to near zero and the water temperature increases by 0.3C compared to 5m water depth. The location of the zero CHF represents a canonical day surface transport barrier where material accumulates, which described herein is heat

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  • Physical and Dynamic Oceanography

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