Dataset: biological samples
Deployment: KOK1108

Cs134, Cs137, Ag110m, and K40 in zooplankton and small fish

Principal Investigator:

Nicholas S. Fisher (Stony Brook University - SoMAS, SUNY-SB SoMAS)

Contact:

Zofia A. Baumann (Stony Brook University - SoMAS, SUNY-SB SoMAS)

BCO-DMO Data Manager:

Theresa McKee (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Establishing Radionuclide Levels in the Atlantic and Pacific Oceans Originating from the Fukushima Daiichi Nuclear Power Facility (Fukushima Radionuclide Levels)

Current State:

Preliminary and in progress

Version:

22 March 2012

Deployment Synonyms:

Fukushima KOK

Version Date:

2012-03-22

Data URL:

https://osprey.bco-dmo.org/dataset-deployment/455046/data

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Description

Counts and concentrations of Cs134, Cs137, Ag110m, and K40 detected in zooplankton and small fish samples are reported. Samples were collected as part of a radioecological study of biota in order to assess the impact of radiation leaks from the Fukushima Daiichi nuclear power facility, damaged by a March 11, 2011 earthquake and tsunami. Radionuclide results were determined from high purity germanium detectors and calibrated against IAEA standards as described in Buesseler et al. (PNAS, 2012).

Methods & Sampling

Dataset acquisition description

Mixed zooplankton samples were sampled using Bongo nets (mesh size = 300 micromol and Methot net (mesh size = 4mm) to collect gelatinous zooplankton, larger crustaceans and fish. Samples collected were pooled together from several casts to achieve biomass needed for radioanalysis. Samples were frozen prior to freeze-drying. Samples that were freeze-dried and ground were stored and analyzed in straight side Nalgene 4oz jar; powdered mass was compressed by a polyacrilamide ring placed on top to assure uniform distribution of the sample in the jar. Biological samples were analyzed using a planar low energy germanium detector - LEGe, Canberra, Model GLP 3830 with a 3800 mm2 active area; Genie 2000 software was used for spectrum analysis.

Data Processing Description

Dataset Processing Description

Total counting efficiencies that accounted for sample geometry and for energy emission were calculated based on standards composed of Se-75, Cs-137 and Eu-152 (265 keV, 662 keV and 1408 keV, respectively). We also accounted for the branching ratio and the concentrations were decay-corrected back to April 6th, 2011 The error reported reflects the % counting error. The lower end of the detection was decided based on the lowest among the samples radionuclide concentration minus one error. We did not correct for coincidence summing. An algorithm used for making these corrections - i.e. total % counting efficiency was: CEtot% = ((-6.24 * ln(sample volume) + 48.23) * (13.74 * energy * ^(-0.79)))/100;

nd = not determined
bd = below detection

More information about this dataset deployment

Funding

Award Number	Funding Source
GBMF3007	Gordon and Betty Moore Foundation
OCE-1136693	NSF Division of Ocean Sciences

Instruments

Bongo Net

Supplied Description:

mesh size = 300 micrometer

Instrument Type

Generic Name: Bongo Net

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/NETT0009/

Generic Description:

A Bongo Net consists of paired plankton nets, typically with a 60 cm diameter mouth opening and varying mesh sizes, 10 to 1000 micron. The Bongo Frame was designed by the National Marine Fisheries Service for use in the MARMAP program. It consists of two cylindrical collars connected with a yoke so that replicate samples are collected at the same time. Variations in models are designed for either vertical hauls (OI-2500 = NMFS Pairovet-Style, MARMAP Bongo, CalVET) or both oblique and vertical hauls (Aquatic Research). The OI-1200 has an opening and closing mechanism that allows discrete "known-depth" sampling. This model is large enough to filter water at the rate of 47.5 m3/minute when towing at a speed of two knots. More information: Ocean Instruments, Aquatic Research, Sea-Gear

Methot Net

Supplied Description:

Methot Net mesh size = 4 millimeter

Instrument Type

Generic Name: Methot Net

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/22/

Generic Description:

A Methot Net, a type of plankton net, is used to sample juvenile fish, shrimp, and 'larger' plankton, e.g. 4 millimeters and larger. Named after its designer, Richard D. Methot, of La Jolla, California, it is also called a Methot Trawl. It is a single net with a large square opening or mouth. The net is deployed from the stern and towed behind the vessel. The Methot uses fine mesh (e.g. 4 mm) but with openings slightly larger than other plankton net systems. The larger mesh size allows the net to be towed at higher speeds. A flowmeter suspended in the mouth of net measures the flow of water moving through the net and allows for the calculation of the volume of water sampled. With its larger mouth and faster speed through the water, the Methot is designed to catch the larger zooplankton that are often missed by other plankton net samplers.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
sta	station ID	dimensionless	sta
date	date of sample in yyyymmdd format	unitless	date
sampling_method	method used to collect sample	dimensionless	sampling_method
sample_type	type of biota in sample	dimensionless	sample_type
dominant_species	most numerous species in sample	dimensionless	dominant_species
abundance_species	percent of total organisms represented by dominant species	dimensionless	abundance
mass_dry	mass of freeze-dried sample	grams	mass_dry
Ag110m_conc_dry	concentration of Ag110m	bequerels/kg	Ag110m_conc_dry
err_Ag110m_conc_dry	error in concentration of Ag110	percent	err_Ag110m_conc_dry
Cs134_conc_dry	concentration of Cs134	bequerels/kg	Cs134_conc_dry
err_Cs134_conc_dry	error in Cs134_conc_dry	percent	err_Cs134_conc_dry
Cs137_conc_dry	concentration of Cs137	bequerels/kg	Cs137_conc_dry
err_Cs137_conc_dry	error in concentration of Cs137	percent	err_Cs137_conc_dry
K40_conc_dry	concentraion of K40	bequerels/kg	K40_conc_dry
err_K40_conc_dry	error in K40_conc_dry	bequerels/kg	no_bcodmo_term
event	event number	dimensionless	event
latitude	latitude, in decimal degrees, North is positive, negative denotes South	decimal degrees	lat
longitude	longtude, in decimal degrees, East is positive, negative denotes West	decimal degrees	lon

Database

Contribute Data

Dataset: biological samples
Deployment: KOK1108

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: biological samplesDeployment: KOK1108

Dataset acquisition description

Dataset Processing Description

Dataset: biological samples
Deployment: KOK1108