Illustration The M Factory © Smithsonian Institution

(Illustration by Jayne Doucette, Woods Hole Oceanographic Institution

Images:http://www.eng.warwick.ac.uk/staff/gpk/Teaching-undergrad/es427/rice.glacier.edu-oceans/GLACIER%20Oceans-%20--%20Densitydriven.htm

Salinity Profile of the North Atlantic at 1000m depth

Image: rst.gsfc.nasa.gov/Sect17/Sect17_4.html

Plankton in San Francisco Bay: Estuary Model

Depth (m)Salinity

(ppt)

Mouth of Estuary (ocean water)

Fresh water i

Plankton - derived from Greek for “drifters”; living organisms that can not

swim against the ocean currents.

- can choose to move up and down in water column in response to

environmental conditions