http://lod.bco-dmo.org/id/dataset/660527
eng; USA
utf8
dataset
Highest level of data collection, from a common set of sensors or instrumentation, usually within the same research project
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
2016-10-04
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Sediment geochemical and microbial activity data collected on R/V Oden along the East Siberian Arctic Shelf from 2014 (ESAS Water Column Methane project)
2016-10-04
publication
2016-10-04
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2019-04-23
publication
https://doi.org/10.1575/1912/bco-dmo.660527.1
Samantha B. Joye
University of Georgia
principalInvestigator
Vladimir Samarkin
University of Georgia
principalInvestigator
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
publisher
Cite this dataset as: Joye, S., Samarkin, V. (2016) Sediment geochemical and microbial activity data collected on R/V Oden along the East Siberian Arctic Shelf from 2014 (ESAS Water Column Methane project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2016-10-04 [if applicable, indicate subset used]. doi:10.1575/1912/bco-dmo.660527.1 [access date]
Sediment geochemical and microbial activity data collected by multi-corer. Dataset Description: <p>These data describe&nbsp;sediment geochemical and microbial activity from the Lappet Sea, East Siberian Arctic Shelf.&nbsp;</p>
<p><strong>All of the methods used to determine concentrations and calculate rates of activity are given in the following papers: Joye S.B. et al. 2010; Joye, S. B. et al. 2010 and Orcutt, B. N. et al. 2005.&nbsp; </strong></p> Methods and Sampling: <p><strong>Acquisition methods are described in the following publication:</strong> <strong>Orcutt, B.N. et al. 2005</strong></p>
<p><strong>Core sectioning, porewater&nbsp;collection&nbsp;and analysis</strong></p>
<p>At each sampling site, sediment sub-samples were collected for porewater analyses and at selected depths for microbial rate assays (AOM, anaerobic oxidation of methane oxidation; methanogenesis (MOG) from bicarbonate and acetate). Sediment was expelled from core liner using a hydraulic extruder under anoxic conditions. The depth intervals for extrusion varied. At each depth interval, a sub-sample was collected into a cut-off syringe for dissolved methane concentration quantification. Another 5 mL&nbsp;sub-sample&nbsp;was collected into pre-weighed and pre-combusted glass vial for determination of porosity (determined by the change in weight after drying at 80 degrees celsius to a constant weight). The remaining material was used for porewater extraction. Sample fixation and&nbsp;analyses&nbsp;for dissolved constituents followed the methods of Joye et al. (2010).&nbsp;</p>
<p><strong>Microbial Activity Measurements&nbsp;</strong></p>
<p>To determine AOM and MOG rates, 8 to 12 sub-samples (5 cm3) were collected from a core by manual insertion of a glass tube. For AOM, 100 uL of dissolved&nbsp;14CH4&nbsp;tracer (about 2,000,000 DPM as gas) was injected into each core. Samples were incubated for 36 to 48 hours at&nbsp;in situ&nbsp;temperature.&nbsp; Following incubation, samples were transferred to 20 mL glass vials containing 2 mL of 2M NaOH (which served to arrest biological activity and fix&nbsp;14CO2&nbsp;as&nbsp;14C-HCO3-).&nbsp; Each vial was sealed with a&nbsp;teflon-lined screw cap, vortexed to mix the sample and base, and immediately frozen. Time zero samples were fixed immediately after radiotracer injection. The specific activity of the tracer substrate (14CH4) was determined by injecting 50 uL directly into scintillation cocktail (Scintiverse BD) followed by liquid scintillation counting. The accumulation of 14C product (14CO2) was determined by acid digestion following the method of Joye et al. (2010).&nbsp; The AOM rate was calculated using equation 1:</p>
<p>AOM Rate = [CH4] x alphaCH4 /t x (a-14CO2/a-14CH4)&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;(Eq. 1)</p>
<p>Here, the AOM Rate is expressed as nmol CH4 oxidized per cm3 sediment per day (nmol&nbsp;cm-3 d-1), [CH4] is the methane concentration (uM), alphaCH4 is the isotope fractionation factor for AOM (1.06; (ALPERIN and REEBURGH, 1988)), t is the incubation time (d), a-14CO2 is the activity of the product pool, and a-14CH4 is the activity of the substrate pool. If methane concentration was not available, the turnover time of the 14CH4 tracer is presented.</p>
<p>Rates of bicarbonate-based-methanogenesis and acetoclastic methanogenesis were determined by incubating samples in gas-tight, closed-tube vessels without headspace, to prevent the loss of gaseous 14CH4 product during sample manipulation. These sample tubes were sealed using custom-designed plungers (black Hungate stoppers with the lip removed containing a plastic “tail” that was run through the stopper) were inserted at the base of the tube; the sediment was then pushed via the plunger to the top of the tube until a small amount protruded through the tube opening. A butyl rubber septa&nbsp;was&nbsp;then eased into the tube opening to displace sediment in contact with the atmosphere and close the tube, which was then sealed with&nbsp;a open-top&nbsp;screw cap.&nbsp; The rubber materials used in these assays were boiled in 1N NaOH for 1 hour, followed by several rinses in boiling milliQ, to leach potentially toxic substances. &nbsp; &nbsp;</p>
<p>A volume of radiotracer solution (100 uL of 14C-HCO3- tracer (~1 x 107&nbsp;dpm&nbsp;in slightly alkaline milliQ&nbsp;water) or 1,2-14C-CH3COO- tracer (~5 x 107&nbsp;dpm&nbsp;in slightly alkaline milliQ&nbsp;water)) was injected into each sample. Samples were incubated as described above and then 2 ml of 2N NaOH was injected through the top stopper into each sample to terminate biological activity (time zero samples were fixed prior to tracer injection).&nbsp; Samples were mixed to evenly distribute NaOH through the sample.&nbsp; Production of 14CH4 was quantified by stripping methane from the tubes with an air carrier, converting the 14CH4 to 14CO2 in a combustion furnace, and subsequent trapping of the 14CO2 in NaOH as carbonate (CRAGG et al., 1990; CRILL and MARTENS, 1986).&nbsp;&nbsp;Activity&nbsp;of 14CO2 was measured subsequently by liquid scintillation counting.&nbsp;</p>
<p>The rates of Bi-MOG and Ac-MOG rates were calculated using equations 2 and 3, respectively:</p>
<p>Bi-MOG Rate = [HCO3-] x alphaHCO3/t x&nbsp; (a-14CH4/a-H14CO3-) &nbsp; &nbsp; (Eq. 2)</p>
<p>Ac-MOG Rate = [CH3COO-] x alphaCH3COO-/t&nbsp; x&nbsp; (a-14CH4/a-14CH314COO-) &nbsp; &nbsp; (Eq. 3)</p>
<p>Both rates are expressed as nmol HCO3- or CH3COO-, respectively, reduced cm-3 d-1, alphaHCO3&nbsp;and alphaCH3COO- are the isotope fractionation factors for MOG (assumed to be 1.06). [HCO3-] and [CH3COO-] are the&nbsp;pore&nbsp;water bicarbonate (mM) and acetate (uM) concentrations, respectively, t is incubation time (d), a-14CH4 is the activity of the product pool, and a-H14CO3 and a-14CH314COO are the activities of the substrate pools. If samples for substrate concentration determination were not available, the substrate turnover constant instead of the rate is presented.</p>
<p>For water column methane oxidation rate assays, triplicate 20 mL of live water (in addition to one 20 mL sample which was killed with ethanol (750 uL of pure EtOH) before tracer addition) were transferred from the CTD into serum vials. Samples were amended with 2 x 10^6 DPM of 3H-labeled-methane tracer and incubated for 24 to 72 hours (linearity of activity was tested and confirmed). After incubation, samples were fixed with ethanol, as above, and a sub-sample to determine total sample activity (3H-methane + 3H-water) was collected. Next, the sample was purged with nitrogen to remove the 3H-methane tracer and a sub-sample was amended with scintillation fluid and counted on a shipboard scintillation counter to determine the activity of tracer in the product of 3H-methane oxidation, 3H-water. The methane oxidation rate was calculated as:</p>
<p>MOX Rate = [methane concentration in nM] x alphaCH4/t&nbsp; x&nbsp; (a-3H-H2O/a-3H-CH4-) &nbsp; &nbsp; (Eq. 3)</p>
Funding provided by NSF Division of Polar Programs (NSF PLR) Award Number: PLR-1023444 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1023444
completed
Samantha B. Joye
University of Georgia
706-542-5893
Dept. of Marine Sciences 325 Sanford Drive
Athens
GA
30602
USA
mjoye@uga.edu
pointOfContact
Vladimir Samarkin
University of Georgia
(706) 542-3614
Department of Marine Sciences University of Georgia
Athens
Georgia
30602
United States
samarkin@uga.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
station
collection_type
year
month
lat
lon
sediment_depth
sample_ID
sed_CH4
AOM_rate
turnover_14_CH3COO_MOG
turnover_H14_CO3_MOG
turnover_SRR
CTD
Liquid scintillation counter
Multiple core
theme
None, User defined
station
sampling_method
year
month of year
latitude
longitude
depth core
sample identification
No BCO-DMO term
featureType
BCO-DMO Standard Parameters
CTD - profiler
Liquid Scintillation Counter
Multi Corer
instrument
BCO-DMO Standard Instruments
SWERUS-C3
service
Deployment Activity
East Siberian Arctic Shelf
place
Locations
otherRestrictions
otherRestrictions
Access Constraints: none. Use Constraints: Please follow guidelines at: http://www.bco-dmo.org/terms-use Distribution liability: Under no circumstances shall BCO-DMO be liable for any direct, incidental, special, consequential, indirect, or punitive damages that result from the use of, or the inability to use, the materials in this data submission. If you are dissatisfied with any materials in this data submission your sole and exclusive remedy is to discontinue use.
The East Siberian Arctic Shelf as a Source of Atmospheric Methane: First Approach to Quantitative Assessment
https://osprey.bco-dmo.org/project/651769
The East Siberian Arctic Shelf as a Source of Atmospheric Methane: First Approach to Quantitative Assessment
<p>We propose to study methane (CH4) release over the East Siberian Arctic shelf (ESAS), the largest (~10% of the world ocean shelf area) and the shallowest shelf (mean depth <50 m) of the world ocean. Until recently, the ESAS was not considered a CH4 source due to subsea permafrost’s impermeability, which completely isolated it from modern biogeochemical cycles. The ESAS stores the world’s largest hydrocarbon stocks, mostly as shallow Arctic hydrates, and thus represents an enormous potential CH4 atmospheric source that could result from global warming-triggered permafrost degradation. Increased CH4 fluxes could occur as numerous weak seeps or strong bubble plumes over large areas. Due to the shallow nature of the ESAS, the majority of ESAS CH4 likely avoids oxidation and escapes to the atmosphere. To assess whether sudden, large-scale CH4 release occurs or is likely to occur in the future, we will investigate the migration pathway characteristics and identify the controlling factors of CH4 flux from the seabed, in the water column, and to the atmosphere.</p>
<p>Our central hypothesis is that seabed CH4 fluxes are significant year-round sources while atmospheric fluxes are only significant during ice-free periods. To understand both the temporal and spatial variability of CH4 fluxes, we will test the sub-hypotheses that ESAS emissions are strongly modulated by seasonal factors including water-column mixing and ice cover, while seabed CH4 emissions are much more weakly modulated (or not at all), and that the spatial distribution of emission correlates with the location of shallow and deep-water fault zones, and submerged thermokarst areas – primary geologic rather than biologic control. We will: 1) distinguish different CH4 sources 2) quantify the importance of microbial production and consumption of CH4 including seasonal variations vs. release of previously originated CH4 from seabed reservoirs; 3) evaluate contributions of different components (spatial, seasonal and transport components) to the annual CH4 flux; 4) investigate controlling factors and model CH4 release during critical periods such as storms, fall convection and ice-break up period and over critical area such as fault zones and thermokarst-affected areas; 5) use modeling to extend results to the entire ESAS and for climate change scenarios.</p>
<p>Water column hydrography and geochemical measurements will be conducted during a summer cruise and a winter expedition. To distinguish between individual CH4 sources we will measure stable carbon isotope ratios (δ13CCH4, δ13CDIC, δ13C-POC), D/H ratio of CH4 and water (δDCH4, δDH2O), CH4 radiocarbon age (Δ14C), and the abundance of non-CH4 hydrocarbons in water, air and sediment samples. To elucidate importance of microbial production (methanogenesis) we will estimate in situ production in particles; CH4 consumption (oxidation) will be measured in the water column and at the ice-water interface. To evaluate total flux, we will perform direct flux measurements (4 helicopter surveys) using eddy-correlation techniques to obtain integrative rates of CH4 flux and assess strength of the current CH4 source over two area. To assess contribution of ebullition, we will measure seafloor direct bubble flux over 6 control and 2 test sites on a nested range of sonar scales (3.5 kHz, largest), to multibeam sonar scanner (decameter), to turbine tents (meter), and a combination of bubble video imaging and bubble modeling (vent scale). To evaluate factors controlling CH4 fluxes, we will perform investigations of seabed permeability for gases using geophysics and 3He/4He ratio. Modeling will aim to develop a regional flux model.</p>
ESAS Water Column Methane
largerWorkCitation
project
eng; USA
oceans
East Siberian Arctic Shelf
125.243
172.361
74.44
78.942
2014-01-01
2014-12-31
East Siberian Arctic Shelf
0
BCO-DMO catalogue of parameters from Sediment geochemical and microbial activity data collected on R/V Oden along the East Siberian Arctic Shelf from 2014 (ESAS Water Column Methane project)
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
http://lod.bco-dmo.org/id/dataset-parameter/660761.rdf
Name: station
Units: unitless
Description: <p>Station where sampling occurred</p>
http://lod.bco-dmo.org/id/dataset-parameter/660762.rdf
Name: collection_type
Units: unitless
Description: <p>Method used to collect samples</p>
http://lod.bco-dmo.org/id/dataset-parameter/660763.rdf
Name: year
Units: unitless
Description: <p>Year of sampling; YYYY</p>
http://lod.bco-dmo.org/id/dataset-parameter/660764.rdf
Name: month
Units: unitless
Description: <p>Month of sampling; mm</p>
http://lod.bco-dmo.org/id/dataset-parameter/660765.rdf
Name: lat
Units: decimal degrees
Description: <p>Latitude</p>
http://lod.bco-dmo.org/id/dataset-parameter/660766.rdf
Name: lon
Units: decimal degrees
Description: <p>Longitude</p>
http://lod.bco-dmo.org/id/dataset-parameter/660767.rdf
Name: sediment_depth
Units: centimeters
Description: <p>Depth of sediment; negative depth values represent overlying water samples</p>
http://lod.bco-dmo.org/id/dataset-parameter/660768.rdf
Name: sample_ID
Units: unitless
Description: <p>PI issued sample ID number</p>
http://lod.bco-dmo.org/id/dataset-parameter/660769.rdf
Name: sed_CH4
Units: microns (uM)
Description: <p>Methane concentration in sediment</p>
http://lod.bco-dmo.org/id/dataset-parameter/660770.rdf
Name: AOM_rate
Units: picomole per centimeter per day (pmol/cm/day)
Description: <p>Anaerobic Oxidation of Methane; CH4 oxidized in sediment per day; Rates were measured at stations 13 and 23 only.</p>
http://lod.bco-dmo.org/id/dataset-parameter/660771.rdf
Name: turnover_14_CH3COO_MOG
Units: percent
Description: <p>14-CH3COO methanogenesis turnover; Rates were measured at stations 13 and 23 only.</p>
http://lod.bco-dmo.org/id/dataset-parameter/660772.rdf
Name: turnover_H14_CO3_MOG
Units: percent
Description: <p>H14-CO3 methanogenesis turnover; Rates were measured at stations 13 and 23 only.</p>
http://lod.bco-dmo.org/id/dataset-parameter/660773.rdf
Name: turnover_SRR
Units: percent
Description: <p>Sulfate reduction methanogenesis turnover; Rates were measured at stations 13 and 23 only.</p>
GB/NERC/BODC > British Oceanographic Data Centre, Natural Environment Research Council, United Kingdom
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
7787
https://darchive.mblwhoilibrary.org/bitstream/1912/24063/1/dataset-660527_multi-core-arctic-sediment-data__v1.tsv
download
https://doi.org/10.1575/1912/bco-dmo.660527.1
download
onLine
dataset
<p><strong>Acquisition methods are described in the following publication:</strong> <strong>Orcutt, B.N. et al. 2005</strong></p>
<p><strong>Core sectioning, porewater&nbsp;collection&nbsp;and analysis</strong></p>
<p>At each sampling site, sediment sub-samples were collected for porewater analyses and at selected depths for microbial rate assays (AOM, anaerobic oxidation of methane oxidation; methanogenesis (MOG) from bicarbonate and acetate). Sediment was expelled from core liner using a hydraulic extruder under anoxic conditions. The depth intervals for extrusion varied. At each depth interval, a sub-sample was collected into a cut-off syringe for dissolved methane concentration quantification. Another 5 mL&nbsp;sub-sample&nbsp;was collected into pre-weighed and pre-combusted glass vial for determination of porosity (determined by the change in weight after drying at 80 degrees celsius to a constant weight). The remaining material was used for porewater extraction. Sample fixation and&nbsp;analyses&nbsp;for dissolved constituents followed the methods of Joye et al. (2010).&nbsp;</p>
<p><strong>Microbial Activity Measurements&nbsp;</strong></p>
<p>To determine AOM and MOG rates, 8 to 12 sub-samples (5 cm3) were collected from a core by manual insertion of a glass tube. For AOM, 100 uL of dissolved&nbsp;14CH4&nbsp;tracer (about 2,000,000 DPM as gas) was injected into each core. Samples were incubated for 36 to 48 hours at&nbsp;in situ&nbsp;temperature.&nbsp; Following incubation, samples were transferred to 20 mL glass vials containing 2 mL of 2M NaOH (which served to arrest biological activity and fix&nbsp;14CO2&nbsp;as&nbsp;14C-HCO3-).&nbsp; Each vial was sealed with a&nbsp;teflon-lined screw cap, vortexed to mix the sample and base, and immediately frozen. Time zero samples were fixed immediately after radiotracer injection. The specific activity of the tracer substrate (14CH4) was determined by injecting 50 uL directly into scintillation cocktail (Scintiverse BD) followed by liquid scintillation counting. The accumulation of 14C product (14CO2) was determined by acid digestion following the method of Joye et al. (2010).&nbsp; The AOM rate was calculated using equation 1:</p>
<p>AOM Rate = [CH4] x alphaCH4 /t x (a-14CO2/a-14CH4)&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;(Eq. 1)</p>
<p>Here, the AOM Rate is expressed as nmol CH4 oxidized per cm3 sediment per day (nmol&nbsp;cm-3 d-1), [CH4] is the methane concentration (uM), alphaCH4 is the isotope fractionation factor for AOM (1.06; (ALPERIN and REEBURGH, 1988)), t is the incubation time (d), a-14CO2 is the activity of the product pool, and a-14CH4 is the activity of the substrate pool. If methane concentration was not available, the turnover time of the 14CH4 tracer is presented.</p>
<p>Rates of bicarbonate-based-methanogenesis and acetoclastic methanogenesis were determined by incubating samples in gas-tight, closed-tube vessels without headspace, to prevent the loss of gaseous 14CH4 product during sample manipulation. These sample tubes were sealed using custom-designed plungers (black Hungate stoppers with the lip removed containing a plastic “tail” that was run through the stopper) were inserted at the base of the tube; the sediment was then pushed via the plunger to the top of the tube until a small amount protruded through the tube opening. A butyl rubber septa&nbsp;was&nbsp;then eased into the tube opening to displace sediment in contact with the atmosphere and close the tube, which was then sealed with&nbsp;a open-top&nbsp;screw cap.&nbsp; The rubber materials used in these assays were boiled in 1N NaOH for 1 hour, followed by several rinses in boiling milliQ, to leach potentially toxic substances. &nbsp; &nbsp;</p>
<p>A volume of radiotracer solution (100 uL of 14C-HCO3- tracer (~1 x 107&nbsp;dpm&nbsp;in slightly alkaline milliQ&nbsp;water) or 1,2-14C-CH3COO- tracer (~5 x 107&nbsp;dpm&nbsp;in slightly alkaline milliQ&nbsp;water)) was injected into each sample. Samples were incubated as described above and then 2 ml of 2N NaOH was injected through the top stopper into each sample to terminate biological activity (time zero samples were fixed prior to tracer injection).&nbsp; Samples were mixed to evenly distribute NaOH through the sample.&nbsp; Production of 14CH4 was quantified by stripping methane from the tubes with an air carrier, converting the 14CH4 to 14CO2 in a combustion furnace, and subsequent trapping of the 14CO2 in NaOH as carbonate (CRAGG et al., 1990; CRILL and MARTENS, 1986).&nbsp;&nbsp;Activity&nbsp;of 14CO2 was measured subsequently by liquid scintillation counting.&nbsp;</p>
<p>The rates of Bi-MOG and Ac-MOG rates were calculated using equations 2 and 3, respectively:</p>
<p>Bi-MOG Rate = [HCO3-] x alphaHCO3/t x&nbsp; (a-14CH4/a-H14CO3-) &nbsp; &nbsp; (Eq. 2)</p>
<p>Ac-MOG Rate = [CH3COO-] x alphaCH3COO-/t&nbsp; x&nbsp; (a-14CH4/a-14CH314COO-) &nbsp; &nbsp; (Eq. 3)</p>
<p>Both rates are expressed as nmol HCO3- or CH3COO-, respectively, reduced cm-3 d-1, alphaHCO3&nbsp;and alphaCH3COO- are the isotope fractionation factors for MOG (assumed to be 1.06). [HCO3-] and [CH3COO-] are the&nbsp;pore&nbsp;water bicarbonate (mM) and acetate (uM) concentrations, respectively, t is incubation time (d), a-14CH4 is the activity of the product pool, and a-H14CO3 and a-14CH314COO are the activities of the substrate pools. If samples for substrate concentration determination were not available, the substrate turnover constant instead of the rate is presented.</p>
<p>For water column methane oxidation rate assays, triplicate 20 mL of live water (in addition to one 20 mL sample which was killed with ethanol (750 uL of pure EtOH) before tracer addition) were transferred from the CTD into serum vials. Samples were amended with 2 x 10^6 DPM of 3H-labeled-methane tracer and incubated for 24 to 72 hours (linearity of activity was tested and confirmed). After incubation, samples were fixed with ethanol, as above, and a sub-sample to determine total sample activity (3H-methane + 3H-water) was collected. Next, the sample was purged with nitrogen to remove the 3H-methane tracer and a sub-sample was amended with scintillation fluid and counted on a shipboard scintillation counter to determine the activity of tracer in the product of 3H-methane oxidation, 3H-water. The methane oxidation rate was calculated as:</p>
<p>MOX Rate = [methane concentration in nM] x alphaCH4/t&nbsp; x&nbsp; (a-3H-H2O/a-3H-CH4-) &nbsp; &nbsp; (Eq. 3)</p>
Specified by the Principal Investigator(s)
<p><strong>BCO-DMO Data Processing Notes:</strong></p>
<p>- filled in blank cells with "nd"<br />
- separated month and year into two columns<br />
- converted lat/lons to decimal degrees<br />
- replaced the code "MUC" with it's complete definition "multiple core"<br />
- replaced the code "BDL" with it's complete definition "below defined level"</p>
Specified by the Principal Investigator(s)
asNeeded
7.x-1.1
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
CTD
CTD
PI Supplied Instrument Name: CTD PI Supplied Instrument Description:Used to collect water column samples Instrument Name: CTD - profiler Instrument Short Name: Instrument Description: The Conductivity, Temperature, Depth (CTD) unit is an integrated instrument package designed to measure the conductivity, temperature, and pressure (depth) of the water column. The instrument is lowered via cable through the water column. It permits scientists to observe the physical properties in real-time via a conducting cable, which is typically connected to a CTD to a deck unit and computer on a ship. The CTD is often configured with additional optional sensors including fluorometers, transmissometers and/or radiometers. It is often combined with a Rosette of water sampling bottles (e.g. Niskin, GO-FLO) for collecting discrete water samples during the cast.
This term applies to profiling CTDs. For fixed CTDs, see https://www.bco-dmo.org/instrument/869934. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/130/
Liquid scintillation counter
Liquid scintillation counter
PI Supplied Instrument Name: Liquid scintillation counter PI Supplied Instrument Description:Used to determine activity of tracer substrate Instrument Name: Liquid Scintillation Counter Instrument Short Name:LSC Instrument Description: Liquid scintillation counting is an analytical technique which is defined by the incorporation of the radiolabeled analyte into uniform distribution with a liquid chemical medium capable of converting the kinetic energy of nuclear emissions into light energy. Although the liquid scintillation counter is a sophisticated laboratory counting system used to quantify the activity of particulate emitting (ß and a) radioactive samples, it can also detect the auger electrons emitted from 51Cr and 125I samples.
Liquid scintillation counters are instruments assaying alpha and beta radiation by quantitative detection of visible light produced by the passage of rays or particles through a suitable scintillant incorporated into the sample. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB21/
Multiple core
Multiple core
PI Supplied Instrument Name: Multiple core PI Supplied Instrument Description:Core used in sampling Instrument Name: Multi Corer Instrument Short Name:Multi Corer Instrument Description: The Multi Corer is a benthic coring device used to collect multiple, simultaneous, undisturbed sediment/water samples from the seafloor. Multiple coring tubes with varying sampling capacity depending on tube dimensions are mounted in a frame designed to sample the deep ocean seafloor. For more information, see Barnett et al. (1984) in Oceanologica Acta, 7, pp. 399-408. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/51/
Cruise: SWERUS-C3
SWERUS-C3
R/V Oden
Community Standard Description
International Council for the Exploration of the Sea
R/V Oden
vessel
SWERUS-C3
Samantha B. Joye
University of Georgia
http://www.swerus-c3.geo.su.se/index.php/expedition
Report describing SWERUS-C3
R/V Oden
Community Standard Description
International Council for the Exploration of the Sea
R/V Oden
vessel