Physical and phytoplankton data were collected using fluorometer and CTD casts in the Northwest Atlantic Ocean from R/V OCEANUS from 18 March 2002 to 31 March 2002. Data were submitted by Dr. Robert J. Olson of Woods Hole Oceanographic Institution (WHOI) to assess the diversity and growth rates of phytoplankton in the northwest Atlantic.

Temperature profile and phytoplankton data were collected using XBT and CTD casts in the Northwest Atlantic Ocean from R/V ENDEAVOR from 01 October 2001 to 15 October 2001. Data were submitted by Dr. Robert J. Olson of Woods Hole Oceanographic Institution (WHOI) with support from the Active fluorescence assays of phytoplankton physiological state: Population and individual cell measurements project.

Temperature profile and phytoplankton data were collected using XBT and CTD casts in the Northwest Atlantic Ocean from R/V ENDEAVOR from 01 October 2001 to 15 October 2001. Data were submitted by Dr. Robert J. Olson of Woods Hole Oceanographic Institution (WHOI) with support from the Active fluorescence assays of phytoplankton: Population and individual cell measurements project.

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This dataset reports plankton species abundance from 5 sites off the Florida Panhandle at the head of DeSoto Canyon, Gulf of Mexico aboard the R/V Bellows cruise BE-1415 on 2014-05-31. The R/V Bellows cruise BE-1415 extended from 2014-05-29 to 2014-06-01. Quantitative phytoplankton profiles were collected at 5 sites (P1, P3, P5, P7, P9) along the Pensacola transect (Longitude -87.25 degrees N). For this, one-liter samples were collected from the surface and at different depths using Niskin bottles. Samples were filtered onto a 0.45-micrometer nitrocellulose filter and air-dried. A portion of each filter was mounted on an aluminum stub, sputter-coated, and examined with a JEOL JSM-6480 LV scanning electron microscope. Diatoms, coccolithophores, and armored dinoflagellates were identified to the lowest possible taxonomic category. The number of cells of each taxon in a field of view at a magnification of 1000x was recorded, with up to 700 fields-of-view examined, depending on the density of phytoplankton in the sample. The dataset includes the depth, the volume filtered, the number of cells of each taxon counted, and the calculated abundance of each taxon in cells per liter. Micrographs taken during the analysis are included.

Phytoplankton cell counts were collected from using a moored submersible flow cytometer from the Martha's Vineyard Coastal Observatory in the Northwest Atlantic Ocean from May-December 2006. Data were submitted by Dr. Robert J. Olson of Woods Hole Oceanographic Institution (WHOI). Cell counts were recorded as an ASCII (.txt) file.