Abstract
Time series observations of water temperature, current velocity, and water transparency were made at three elevations at a mooring in southwestern Lake Ontario over a 14-day period. Although a strong downwelling event occurred during the deployment, there was no indication of either local sediment resuspension or of downslope transport of suspended material. Our observations, when combined with those of Hawley and Lesht (1995), indicate that material is not supplied to the benthic nepheloid layer by either local resuspension or offshore transport during the stratified period. Although several authors have suggested that the maintenance of the benthic nepheloid layer during the stratified period requires the periodic supply of additional material after it is formed, the sources of this material are not well known. Some material is most likely supplied by the settling of material from the epilimnion, but an additional—as yet unidentified—source seems to be needed to explain the observed changes in both the thickness and the concentration of material suspended in the benthic nepheloid layer.
Published Version
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