Abstract
An autonomous vertical profiler was deployed at a site in 55 m of water in southern Lake Michigan during the late summer of 2001. Profiles of temperature and water transparency were made hourly between 1 and 40 meters above the bottom for about 23 days (568 profiles). The temperature observations show that the depth of the thermocline changed in response to both near-inertial internal waves and to upwelling and downwelling events. The transparency measurements show the presence of both an intermediate nepheloid layer located near the base of the thermocline and a benthic nepheloid layer at the bottom. The layers were usually separated by a region of clearer water, but during one upwelling event they merged together. Changes in both the intermediate nepheloid layer and the benthic nepheloid layer occurred in response to changes in the thermocline depth. The total amount of material suspended in both the bottom 40 m and in the benthic nepheloid layer varied by over 50%. The source of the additional material appears to be local resuspension events caused either directly or indirectly by near-inertial internal waves.
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