NOTE: These videos work best in browsers other than Safari, which shows grey background. The videos show how temperature and salinity vary over time during typical tidal cycles in Casco Bay. The Dye video shows how a dye inserted at selected points can spread over time. One video layer is near the surface and the other is near the bottom. Click on the image to play the video.

            Near the Surface, Sept 5-15, 2024

Temperature  

  The cooler surface temperatures near shore mix with depth as the tides flow in and out.

Salinity 

  Yellow contour lines show fresher water entry from river outlets.

Dye 

  Dye concentrations show how water spreads from a single point, like discharge from Portland Treatment plant that moves into Back Cove.

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         Near the Bottom, Sept 5-15, 2024 

Temperature  

  The cooler surface temperatures near shore mix with depth as the tides flow in and out.

Salinity 

  Yellow contour lines show fresher water entry from river outlets.

Dye 

  Dye concentrations show how water spreads from a single point, like discharge from Portland Treatment plant that moves into Back Cove.