Sediment Resuspension!

Over the last few hours we’ve seen large concentrations of sediment throughout the water-column. Values were reduced as RU23 transited over a shallow ridge, but reached expected full water-column values shortly afterward.

Optical backscatter at 470 nm wavelength

 

 

 

 

 

 

Some variability in suspended sediment concentration may be due to a change from coarse to fine sand grains. Small fine sand grains are more readily resuspended and retained in the water-column by turbulence. Below is a map of RU23′s path over the gridded mean grain-size from the usSEABED project (http://walrus.wr.usgs.gov/usseabed/). This product was compiled and developed by John Goff at the University of Texas at Austin.

RU23′s track mapped over mean sediment grain size on the New Jersey shelf.