Dataset: Shipboard Plankton Dilution Experiment Chlorophyll collected at the mid-Atlantic Bight Shelfbreak on R/V Neil Armstrong AR29, R/V Ronald H. Brown RB1904 and R/V Thomas G. Thompson TN368 to the New England Shelfbreak in April 2018 and and May/July 2019

Daily Microzooplankton Grazing 2-Point Dilution Experiments were conducted on each of three cruises as a component of the SPIROPA project. 12 experiments/Cruise, Targeting 3 water mass regimes: shelf, shelfbreak front and slope waters.

Grazing experiment sample water was collected with a CTD/Niskin bottle rosette at depths ranging from surface to 56m, targeting chl-a max if present. The two dilution treatments were 100% of <200 µm filtered water and 10% of <200 µm water. Station water filtered through a Whatman 1.2 µm glass fiber filter was used as dilution water for the 10% treatment.