Vertical diffusion and oxygen consumption during stagnation periods in the deep North Aegean |
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| Institution: | 1. Institute of Oceanography and Fisheries, Split, Croatia;2. Ru?er Bo?kovi? Institute, Zagreb, Croatia;3. The University of Western Australia, School of Civil, Environmental and Mining Engineering & UWA Oceans Institute, Crawley, WA 6009, Australia;1. Department of Civil Engineering, Faculty of Engineering, Kharazmi University, Tehran, Iran;2. Department of Earth and Environmental Science, University of Pennsylvania, PA, USA;3. Wood PLC, Vancouver, BC, Canada;4. BES Department, University of Stirling, United Kingdom |
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| Abstract: | Ventilation of the deep basins of the North Aegean Sea takes place during relatively scarce events of massive dense water formation in that region. In the time intervals between such events, the bottom waters of each sub-basin are excluded from interaction with other water masses through advection or isopycnal mixing and the only process that changes their properties is diapycnal mixing with overlying waters. In this work we utilize a simple one-dimensional model in order to estimate the vertical eddy diffusion coefficient Kρ based on the observed rate of change of density and stratification. Vertical diffusivity is estimated for each of three sub-basins of the North Aegean, one of convex shape of the seabed and the other two of concave topography. It is noteworthy that the convex sub-basin exhibited much higher vertical diffusivity than the two concave sub-basins, a fact consistent with theoretical predictions that internal-wave-induced mixing is higher over the former shape of seabed. Furthermore, the estimates of Kρ are exploited in computing the vertical transport of dissolved oxygen through diffusion and the rate of oxygen consumption by decaying organic matter. The different levels of the estimated diffusion and oxygen consumption rates testify to the dynamical and biogeochemical characteristics of each basin. |
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