Nutrient Concentrations and CTD Data Measured during the JGOFS North Atlantic Bloom Experiment (NABE)

The Joint Global Ocean Flux Study (JGOFS) seeks to understand
the processes that control the transfer of carbon and other
biologically active elements in the ocean. In addition, JGOFS
hopes to improve global-scale predictions of the ocean's response to
human-induced climate change.

The North Atlantic Bloom Experiment (NABE) was a multidisciplinary,
multinational pilot study of JGOFS, studying the spring phytoplankton
bloom in the North Atlantic and its associated biogeochemical
processes. It took place from April until July, 1989, on two cruises
of the RV Atlantis II and one cruise of the RV Endeavor. The stations
in the North Atlantic were located from 18N to 72N and from 8W to 47W.

At several stations, a water pump was used to collect water samples
from various depths. The water samples were analyzed for nutrient
concentrations. The nutrients include ammonium, nitrate, nitrite, and
urea. In addition, a CTD (Conductivity, Temperature, Depth) was used
to measure salinity, temperature, density (sigma-t), oxygen
concentration, beam attenuation coefficient, and rescaled fluorescence
(numerically equivalent to chlorophyll-a). The CTD values are given
for the same depths as the nutrient values.

The data is public domain and can be retrieved on-line at
"http://usjgofs.whoi.edu/jg/dir/jgofs/"

[This summary was derived from Oceanus vol. 35 and from the JGOFS WWW
pages at WHOI.]