Dataset: phytoplankton
Deployment: T0205

SLOWDROP optical profiling:
"We deployed a free-fall profiling system to provide high resolution vertical profiles of temperature, salinity, density (using Sea-Bird 911 CTD), along with bio-optical properties based on multi-wavelength absorption and attenuation (Wetlabs ac-9) as well as multi-wavelength fluorescence. These profiles were conducted as the optical drifters were recovered in order to provide water column assessments of the optical properties detected by the surface drifters. The optical instruments on the SLOWDROP profiler also provide calibration for the ac-9 and fluorometers used on the SeaSoar.

Underway optical properties:
The assessment of the spatial and temporal variability in phytoplankton biomass and physiology was achieved principally by gathering a continuous record of phytoplankton in vivo fluorescence, variable fluorescence, and water absorption and attenuation, using a 10-AU Turner Designs fluorometer, a Chelsea fast Repetition Rate fluorometer, and a Wetlabs ac-9 in a flow-through mode during SeaSoar survey periods.

CTDs:
In addition to the continuous records, discrete samples for chlorophyll fluorometric determinations, pigment analysis, particle absorption, and nutrients were collected every hour during the SeaSoar mesoscale survey (approximately every 10 nm) and every half hour during fine scale surveys. Samples for phytoplankton specific determination were collected at selected locations and preserved with formaldehyde."

(from W0005 cruise report. Other specific cruise-related acquisition information can be found with cruises W0008, T0205 and R0208)

CTD/Rosette:
"CTD/rosette casts were made at specific stations along the survey lines when the SeaSoar system was out of the water. The CTD had dual T/C sensors, fluorometer, transmissometer, and oxygen sensor in addition to the rosette. Water samples were collected from the 10-l Niskin bottles for primary productivity, nutrients, salinity calibration and for chlorophyll extractions.

Flow-through systems using near-surface seawater:
We integrated T, S and chlorophyll fluorescence from the ship's flow-through system with GPS and bottom depth from the echosounder. We installed two ac-9s, a Fast Repetition Rate Fluorometer (FRRF), chlorophyll fluorometers and CDOM fluorometers into the underway flowthrough seawater system in the main lab. A vortex debubbler was connected in the seawater line. We used discrete samples from this system for analysis of particle size, nutrient concentration, and primary productivity."

(from T0205 cruise report)