N-uptake from R/V Kaiyo-Maru cruises KY0103-02 and KY0103-01 in the Northwestern Sub-Arctic Pacific in 2001 (SEEDS I project)

Website: https://www.bco-dmo.org/dataset/2903
Version: 27August2008
Version Date: 2008-08-27

Project
» Subarctic-Pacific Iron Experiment for Ecosystem Dynamics Study I (SEEDS I)

Program
» Iron Synthesis (FeSynth)
ContributorsAffiliationRole
Kudo, IsaoHokkaido UniversityPrincipal Investigator
Mackie, DougUniversity of OtagoContact
Gegg, Stephen R.Woods Hole Oceanographic Institution (WHOI)BCO-DMO Data Manager


Dataset Description

SEEDS 2001 N-uptake
(NO3+NO2), NH4 and chla a measurements, for all IN stations
and day 4, 9, 13 OUT stations at 5 and 15 m.


Data Processing Description

BCO-DMO Processing Notes
CSV file generated by Doug Mackie from original spreadsheet N-uptake.xls

Notes from CSV file generated by Doug Mackie:
zero values as pre original file
missing data nd

BCO-DMO Edits
- Parameter names modified to conform to BCO-DMO convention


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Data Files

File
Nuptake.csv
(Comma Separated Values (.csv), 1.76 KB)
MD5:42b6db8a7d11dbd51280910debe8ab1a
Primary data file for dataset ID 2903

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Parameters

ParameterDescriptionUnits
date

Date UTC

YYYYMMDD
lat

latitude, negative denotes South

decimal degrees
lon

longitude, negative denotes West

decimal degrees
station

Station Id

text
time_start

Start time of station

HHMM
time_end

End time of station

HHMM
depth

Sample depth in meters

meters
NO3_plus_NO2

NO3_plus_NO2

ug-at l-1
NH4

NH4

ug-at l-1
Urea

Urea

ug-at l-1
chla

chla

ug l-1
rNO3

rNO3

ug-at l-1 d-1
rNH4

rNH4

ug-at l-1 d-1
rUrea

rUrea

ug-at l-1 d-1
f_ratio_wo_urea

f-ratio_wo_urea

dimensionless

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Deployments

KY0103-02

Website
Platform
R/V Kaiyo-Maru
Start Date
2001-07-13
End Date
2001-08-06
Description
Patch enrichment = Leg 2: 13 Jul 2001 (Kushiro)--06 Aug 2001 (Tokyo)Note: No cruise track was contributed for this deployment. Data are plotted outside what is displayed as the "best availble" cruise track from the data contributed

KY0103-01

Website
Platform
R/V Kaiyo-Maru
Start Date
2001-06-28
End Date
2001-07-10
Description
Pre-infusion observations = Leg 1: 28 Jun 2001 (Tokyo) to 10 Jul 2001 (Kushiro) Note: No cruise track was contributed for this deployment. Data are plotted outside what is displayed as the "best availble" cruise track from the data contributed


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Project Information

Subarctic-Pacific Iron Experiment for Ecosystem Dynamics Study I (SEEDS I)


Coverage: Western subarctic gyre in the North Pacific at 48.5°N, 165°E


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

A single enrichment of dissolved iron caused a large increase in phytoplanktonstanding 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 CTDsampling 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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Program Information

Iron Synthesis (FeSynth)

Coverage: Global


The two main objectives of the Iron Synthesis program (SCOR Working Group proposal, 2005), are:
1. Data compilation: assembling a common open-access database of the in situ iron experiments, beginning with the first period (1993-2002; Ironex-1, Ironex-2, SOIREE, EisenEx, SEEDS-1; SOFeX, SERIES) where primary articles have already been published, to be followed by the 2004 experiments where primary articles are now in progress (EIFEX, SEEDS-2; SAGE, FeeP); similarly for the natural fertilizations S.O.JGOFS (1992), CROZEX (2004/2005) and KEOPS (2005).

2. Modeling and data synthesis of specific aspects of two or more such experiments for various topics such as physical mixing, phytoplankton productivity, overall ecosystem functioning, iron chemistry, CO2 budgeting, nutrient uptake ratios, DMS(P) processes, and combinations of these variables and processes.

SCOR Working Group proposal, 2005. "The Legacy of in situ Iron Enrichments: Data Compilation and Modeling".
http://www.scor-int.org/Working_Groups/wg131.htm

See also: SCOR Proceedings Vol. 42 Concepcion, Chile October 2006, pgs: 13-16 2.3.3 Working Group on The Legacy of in situ Iron Enrichments: Data Compilation and Modeling.

The first objective of the Iron Synthesis program involves a data recovery effort aimed at assembling a common, open-access database of data and metadata from a series of in-situ ocean iron fertilization experiments conducted between 1993 and 2005. Initially, funding for this effort is being provided by the Scientific Committee on Oceanic Research (SCOR) and the U.S. National Science Foundation (NSF).

Through the combined efforts of the principal investigators of the individual projects and the staff of Biological and Chemical Oceanography Data Management Office (BCO-DMO), data currently available primarily through individuals, disparate reports and data agencies, and in multiple formats, are being collected and prepared for addition to the BCO-DMO database from which they will be freely available to the community.

As data are contributed to the BCO-DMO office, they are organized into four overlapping categories:
1. Level 1, basic metadata
(e.g., description of project/study, general location, PI(s), participants);
2. Level 2, detailed metadata and basic shipboard data and routine ship's operations
(e.g., CTDs, underway measurements, sampling event logs);
3. Level 3, detailed metadata and data from specialized observations
(e.g., discrete observations, experimental results, rate measurements) and
4. Level 4, remaining datasets
(e.g., highest level of detailed data available from each study).

Collaboration with BCO-DMO staff began in March of 2008 and initial efforts have been directed toward basic project descriptions, levels 1 and 2 metadata and basic data, with detailed and more detailed data files being incorporated as they become available and are processed.

Related file

Program Documentation

The Iron Synthesis Program is funded jointly by the Scientific Committee on Oceanic Research (SCOR) and the U.S. National Science Foundation (NSF).



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