Dataset: chlorophyll a
Deployment: SJ0516

NOTE: station 1- or 2- refers to either cruise leg 1 (Florida to the Azores) or cruise leg 2 (Azores to Iceland)

Only 'surface' samples were taken while dead-heading on leg 1. The surface samples are recorded as being from nominal depth of 3 meters as that was the approximate depth of the ship's underway intake system.

Calibration notes

Instrument was calibrated prior to the cruise (~ May 1, 2005) using extracted chlorophyll a standards.

Extracted standards were checked with a spectrophotometer to determine chlorophyll a concentrations.

Extracted standards were used to calibrate the solid standard (Turner Designs).

Solid-standard normalizations were completed each day upon initiation of the fluorometer.

Size-fractionated chl a concentrations were determined on replicate samples collected on 0.22, 2.0, and 20.0 um nominal pore size, 47 mm diameter polycarbonate filters (Osmonics). Samples were extracted in 90% acetone for 24 h at 4°C and quantified using a solid-standard normalized 10-AU field fluorometer (Turner Designs) using the nonacidification protocol (Welschmeyer 1994).

Welschmeyer NA (1994) Fluorometric analysis of chlorophyll
a in the presence of chlorophyll b and phaeopigments.
Limnol Oceanogr 39:1985-1992