Acronym: SEEDS 2001
Program: Iron Synthesis [FeSynth]
URL: Project Web Site
Start date: 2001-06
End date: 2001-08
Geolocation: Western subarctic gyre in the North Pacific at 48.5°N, 165°E
Description:

An in situ test of the iron limitation hypothesis in the subarctic North Pacific Ocean
was performed. First experiment of two (see SEEDS 2004)

A single enrichment of dissolved iron caused a large increase in phytoplankton
standing stock and decreases in macronutrients and dissolved carbon dioxide.
The dominant phytoplankton species shifted after the iron addition from pennate
diatoms to a centric diatom, Chaetoceros debilis, that showed a very high growth
rate, 2.6 doublings per day. Conclusion was that the bioavailability of iron regulates
the magnitude of the phytoplankton biomass and the key phytoplankton species
that determine the biogeochemical sensitivity to iron supply of high-nitrate,
low-chlorophyll waters.

Data was collected at a total of 13 stations and from 3 moored sediment traps.
  - Stations were occupied IN patch for days 0, 2, 4, 7, 9, 11 and 13.
  - Stations were occupied OUT patch for days 2, 4, 7, 9, 11, 13.

It is not explicitly stated but it appears that at all stations two CTD
sampling rosette casts were made: clean and rms. The clean rosette
appears to have typically sampled the mixed layer (<50 m) e.g. 5, 10,
20, 30, 50 m. The rms rosette appears to have typically sampled the
euphotic zone (<200m) e.g. 10, 20, 30, 40, 50, 80, 100, 150, 200 m.

Sediment traps were deployed at
  - CENTRE: 20 m
  - IN: 40, 60, 100, 200 m
  - OUT: 20, 40, 60 and 100 m

Traps were recovered several times. Deployment times (days):
  - CENTRE: 3.95, 2.83, 2.02, 1.98, 1.93, 2.05
  - IN: 3.99, 2.84, 2.03, 2.00, 1.95, 2.01
  - OUT: 5.17, 3.97, 3.42

BCO-DMO/Doug Mackie Note:
Throughout these data, stations are identified as D2-I, D2-O, etc.
D2-I indicates “Day 2, in patch station”.
while D2-O indicates “Day 2, out patch station”.
This applies to all station identifiers.

Related file

SEEDS 2001 Project Documentation

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More information about project Subarctic-Pacific Iron Experiment for Ecosystem Dynamics Study I
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