Tidal resuspension and deposition of particulate matter in the Oyster Grounds, North Sea
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ID: 297612
1998
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Abstract
Moored current meters, e uorometers and transmissometers were used in combination with sediment traps (aspect ratio . 4) and shipborne sampling to determine e uxes of deposition and resuspension of total suspended matter (TSM) under tidal action in the 45 m deep Oyster Grounds, North Sea. Here, we present data from the mixed layer below the major thermocline at about 20 m above the bottom (mab) as obtained during a 14-day period of calm weather in July 1994. Around neap tide near-bottom current velocities remained smaller than 0.15 m s 2 1 and TSM was dominated by particles advected from a relatively turbid area to the southeast of the study site. At the onset of spring tide, current speeds increased with maximum values greater than 0.20 m s 2 1 and seabed friction velocities exceeding the threshold value for resuspension. Particles resuspended were strongly enriched with organic carbon compared to the bulk sediment, suggesting that not the bed proper but a e ne-grained e uff fraction was eroded. This resuspended e uff was by far the dominant source for the mass e uxes in the sediment trap (at 3.2 mab), which showed a distinct tidal cycle with highest e uxes directly after low water slack tide and lowest e uxes during maximum ebb current. This pattern was caused by variations in apparent settling velocity of TSM, presumably due to e oc formation during periods in the tidal cycle when current speeds were low and relatively high concentrations of both chlorophyll-a and TSM were found. From a simple model on advection, deposition and resuspension of TSM, we calculated a net accumulation on the sediment of 75 g m 2 2 during the 14-day study period, which is the difference between gross e uxes of deposition and resuspension. Upon deposition, the average retention time of particles until their next resuspension is calculated at 1‐ 2 weeks, which may be sufficient for substantial decomposition of organic matter associated with TSM. This implies that, upon resuspension, particles transported further along the shelf are relatively poor in organic carbon. It is concluded that the Oyster Grounds serve as a mid-shelf temporary depocenter and that mineralization in this and similar areas may play a crucial role in the carbon budget of the North Sea.
| Reference Key |
openalex_W2086809553
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| Authors | Wim Van, Hans Malschaert, Hans Van |
| Journal | journal of marine research |
| Year | 1998 |
| DOI |
10.1357/002224098321836181
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| URL | |
| Keywords | Keywords not found |
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