http://lod.bco-dmo.org/id/dataset/1002503
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
2026-07-13
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Sediment geochemical data from sediment cores collected at methane seeps and reference sites in mainstem Chesapeake Bay in July 2022
2026-08-20
publication
2026-08-20
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2026-09-08
publication
https://doi.org/10.26008/1912/bco-dmo.1002503.1
Laura L. Lapham
University of Maryland Center for Environmental Science
principalInvestigator
John Pohlman
United States Geological Survey
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: Lapham, L. L., Hildebrand, A., Pohlman, J. (2026) Sediment geochemical data from sediment cores collected at methane seeps and reference sites in mainstem Chesapeake Bay in July 2022. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2026-08-20 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.1002503.1 [access date]
Sediment geochemical data from mainstem Chesapeake Bay in July 2022 Dataset Description: Methods and Sampling: <p><strong>Core collection:</strong> Cores were collected via a gravity corer (1 meter) in July 2022 during R/V Carson cruise CB22 (R/V Carson is operated by the University of Maryland Center for Environmental Science, <a href="https://www.umces.edu/research-fleet/" target="_blank">https://www.umces.edu/research-fleet/</a>).</p>
<p><strong>Sediment and porewater extraction:</strong> For CH4, CO2, δ13C-CH4, and δ13C-CO2 measurements, a cutoff 3 milliliter (mL) syringe was inserted into pre-drilled holes in the core liner at 5 centimeters (cm) resolution. Two 3 mL sediment plugs were taken for CH4/CO2 and placed in a whirlpak bag. For porewater extraction, rhizons (19.21.23 F; Rhizosphere Research Products) were inserted into pre-drilled holes offset from the sediment holes in the core liner. A vacuum was pulled with an acid-clean 30 mL syringe to extract the porewater, then pipetted into respective containers for DIC, δ13C-DIC, DOC, δ13C-DOC, SO4, and Cl.</p>
<p><strong>Sediment/porewater sampling:</strong><br />
CH4, CO2, δ13C-CH4, δ13C-CO2: 20 mL glass serum vials containing 3-6 mL sediment preserved with 5 mL saturated brine were subsampled using the headspace equilibration method following Magen et al. (2014). Briefly, 8 mL of ultra-zero purity air (UZA) was injected into the sediment vial with a plastic syringe equipped with a 22-gauge needle. Vials were shaken, and the headspace was mixed for 2 minutes, after which 8 mL of headspace gas sample was removed. Check standards for concentration were run approximately every 5 samples and corrected as described by Pohlman and others (2021). For samples measured by cavity ring-down spectroscopy, dissolved concentrations were calculated using the following equation:</p>
<p>((pCH4 * 10^-6 * Vg) / (R * T_extraction) + (Vw * pCH4 * 10^-6 * Sol_CH4)) / Vw * 10^6 = [CH4]</p>
<p>Where pCH4 is the headspace concentration of methane in ppm, Vg is the volume of gas sample in mL, R is the gas constant in L-atm/mol-K, T_extraction is the extraction temperature in Kelvin, Vw is the volume of water sample that was extracted in mL, Sol_CH4 is the solubility of methane in mol/L-atm (Wiesenburg &amp; Guinasso, 1979; Yamamoto et al., 1976), and [CH4] is the dissolved concentration of methane in the original natural water sample, in micromoles per liter.</p>
<p>DIC and δ13C-DIC: 1 mL porewater was injected into a helium-filled 12 mL exetainer vial pre-filled with 1mL 85% phosphoric acid. The stable carbon isotope ratios and concentrations were determined from CO2 by isotope ratio mass spectrometry. Measurements are standardized with lithium carbonate reference material, and isotope ratios are reported in the standard d-notation relative to VPDB.</p>
<p>DOC and δ13C-DOC: 40 mL amber VOA vials containing 1 mL porewater sample acidified to pH 2 with trace metal clean HCl were measured with the wet oxidation method, similarly to the setup detailed in Lalonde et al. (2014). Samples are acidified and sparged to remove inorganic carbon then reacted with Sodium persulfate as wet oxidation. Data was normalized using two different internal organic standards (precision ± 0.5 ppm for concentrations and 0.2‰ for isotopes).</p>
<p>SO4 and Cl: 2 mL microcentrifuge tubes containing 40 uL porewater sample acidified to pH 2 with 0.1M H3PO4 were diluted (135x) with Milli-Q water prior to analysis. IAPSO certified seawater standards (Ocean Scientific International Ltd.) were used for all samples and precision is ±1.5%.</p>
<p>TOC and δ13C-TOC: Sediment samples from all cruises were dried at 60 degrees C for three days, then ground with a mortar and pestle. Homogenized sediment was weighed into silver capsules for acid fumigation. Samples were acid fumigated to remove carbonate and dried at 60 degrees Celsius for 2-4 hours, then wrapped into tin capsules. Samples were run on an elemental analyzer interfaced with an isotope ratio mass spectrometer. Samples were normalized to an acetanilide, protein, and bass standard calibrated to standards USGS 40 and USGS 41. Stable carbon isotope values are reported in d notation relative to VPDB.</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-2049517 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=2049517
completed
Laura L. Lapham
University of Maryland Center for Environmental Science
PO Box 38
Solomons
MD
20688-0038
USA
lapham@umces.edu
pointOfContact
John Pohlman
United States Geological Survey
jpohlman@usgs.gov
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Sample_ID
Site_Name
Station_ID
Latitude_ddeg
Longitude_ddeg
Sampling_Date
Water_Depth_m
Core_Allocation
Sediment_Depth_cmbsf
Sediment_interval_thickness_cm
d13C_TOC_permille
Corg_percent
d13C_TON_permille
Norg_percent
Comment
Costech ECS 4010 elemental analyzer
gravity corer
Thermo Scientific Aquion ion chromatograph
ThermoFinnigan Delta S & Delta V Plus
ThermoFinnigan DELTAplus XL
AS40 Autosampler
Picarro G2201-i CRDS
GasBench II
Aurora 1030C
theme
None, User defined
sample identification
site
station
latitude
longitude
date
depth_bottom
sample description
depth core
sed_thickness
d13C
organic carbon
Nitrogen
comments
featureType
BCO-DMO Standard Parameters
Costech International Elemental Combustion System (ECS) 4010
Gravity Corer
Ion Chromatograph
Isotope-ratio Mass Spectrometer
Isotope-ratio Mass Spectrometer
Laboratory Autosampler
Picarro G2201-i isotope analyzer
Thermo-Fisher Scientific Gas Bench II
Total Organic Carbon Analyzer
instrument
BCO-DMO Standard Instruments
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.
Collaborative Research: Investigating the source and flux of dissolved organic carbon released from methane seeps to the deep-ocean
https://sites.google.com/umces.edu/thelaphamlab/home/projects/seepdoc
Collaborative Research: Investigating the source and flux of dissolved organic carbon released from methane seeps to the deep-ocean
<p><em>NSF Award Abstract:</em><br />
Dissolved organic carbon (DOC) is a key component of the ocean’s food web and carbon cycle, and carbon exchanged between oceanic DOC and the atmosphere has influenced atmospheric CO2 levels on timescales ranging from recent decades to the geologic past. Production by marine algae in the surface ocean is the largest source of DOC and its effects on the ocean carbon cycle are widely appreciated. However, the contribution of DOC from additional sources such as rivers, hydrothermal vents, and methane seeps and their impact on ocean ecology and chemistry are not well understood. Each source differs in terms of its biological utilization and age, which affects the storage and distribution of DOC among the ocean basins. Methane seeps located along continental margins are particularly significant because they may transfer globally significant quantities of carbon stored below the seafloor as natural gas and gas hydrate to the oceans. This project will investigate the production, flux, composition and potential for biological utilization of DOC at Hydrate Ridge, located offshore Oregon. Hydrate Ridge is a prominent methane seep with massive accumulations of gas hydrate and a node of the Ocean Observatories Initiative telecommunications cabled array on the Juan De Fuca tectonic plate, which provides a continuous stream of real-time regional oceanographic data. We will sample and chemically characterize methane, DOC, and other materials to provide information about where the materials originated (deep vs shallow), how they have been chemically altered, to what extent they may feed deep ocean organisms, or contribute to the long term storage of DOC in the ocean. Experiments and analysis will be conducted using sediment cores and bottom water samples collected using either the remotely operated vehicle Jason or the human occupied vehicle Alvin during a 7-day ocean expedition. Additionally, this project will place osmotically-driven pumps on the seafloor to continuously sample fluids for approximately one year, thereby allowing us to monitor the movement of methane and DOC expelled from the seafloor to the ocean and constrain processes that regulate the release of carbon to the oceans at methane seeps. This project will support one graduate student and several undergraduates from a community college in Maryland and a college located in a lower-income urban center in southeastern Massachusetts. We will disseminate project findings to the public with a series of videos for public TV.</p>
<p>This study will investigate the production, flux and reactivity of methane-derived dissolved organic carbon (DOC) from methane (CH4) seeps at Hydrate Ridge, Offshore Oregon. The study will address four fundamental questions to determine the significance of CH4-derived DOC within the ocean carbon cycle: (1) How much CH4-derived fossil DOC do seeps contribute to the oceans? (2) To what extent is CH4-derived C incorporated into DOC during anaerobic oxidation of CH4? (3) Is seep DOC bioavailable or recalcitrant when released into the deep ocean? (4) How does the flux of DOC to the water column vary over time? We will employ an interdisciplinary strategy that includes in situ sampling, laboratory incubations, and a comprehensive analytical geochemistry program. Data from the Ocean Observatories Initiative Regional Cabled Array at Southern Hydrate Ridge will be used to provide context for field and experimental data. The composition and abundance of organic and inorganic chemical species along with the stable and radiocarbon isotope composition of pore water, bulk sediment, and water column C pools will be used to identify DOC sources and quantify fluxes from cold seeps characterized by a range of advection rates. The centerpiece of the investigation will be a 7-day research cruise to Hydrate Ridge to collect sediments, pore fluids, and water column samples, and deploy OsmoSamplers for continuous time series fluid sampling. The results will form the foundation for estimating the contribution of CH4-derived DOC to the oceanic DOC pool.</p>
<p>This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.</p>
seepDOM
largerWorkCitation
project
eng; USA
oceans
-76.44806787
-75.93866667
37.20698975
39.27923481
2022-07-25
2022-07-29
Astoria Canyon and Hydrate Ridge
0
BCO-DMO catalogue of parameters from Sediment geochemical data from sediment cores collected at methane seeps and reference sites in mainstem Chesapeake Bay in July 2022
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/1005772.rdf
Name: Sample_ID
Units: unitless
Description: <p>Sample ID. Sample IDs are numbers given to each sediment sub-sample when collected</p>
http://lod.bco-dmo.org/id/dataset-parameter/1005773.rdf
Name: Site_Name
Units: unitless
Description: <p>Site name for sample collection</p>
http://lod.bco-dmo.org/id/dataset-parameter/1005774.rdf
Name: Station_ID
Units: unitless
Description: <p>Station ID for sample collection</p>
http://lod.bco-dmo.org/id/dataset-parameter/1005775.rdf
Name: Latitude_ddeg
Units: decimal degrees
Description: <p>Sample latitude, south is negative</p>
http://lod.bco-dmo.org/id/dataset-parameter/1005777.rdf
Name: Longitude_ddeg
Units: decimal degrees
Description: <p>Sample longitude, west is negative</p>
http://lod.bco-dmo.org/id/dataset-parameter/1005779.rdf
Name: Sampling_Date
Units: unitless
Description: <p>Date the sample was collected</p>
http://lod.bco-dmo.org/id/dataset-parameter/1005780.rdf
Name: Water_Depth_m
Units: meters (m)
Description: <p>Depth of the seafloor relative to the sea surface at the sample location</p>
http://lod.bco-dmo.org/id/dataset-parameter/1005781.rdf
Name: Core_Allocation
Units: unitless
Description: <p>Core Allocation. Core allocations were for specific project needs. Geochem = geochemical characterization; Radionuclide = radionuclide measurements and associated geochemistry</p>
http://lod.bco-dmo.org/id/dataset-parameter/1005782.rdf
Name: Sediment_Depth_cmbsf
Units: centimeters below sea floor (cmbsf)
Description: <p>Mid-depth of core sub-section relative to the sediment water interface</p>
http://lod.bco-dmo.org/id/dataset-parameter/1005783.rdf
Name: Sediment_interval_thickness_cm
Units: centimeters (cm)
Description: <p>Sediment interval thickness of the collected sample</p>
http://lod.bco-dmo.org/id/dataset-parameter/1005784.rdf
Name: d13C_TOC_permille
Units: per mille (‰)
Description: <p>Bulk stable carbon isotope value of sediment total organic carbon content relative to Vienna Pee Dee Belemnite (VPDB)</p>
http://lod.bco-dmo.org/id/dataset-parameter/1005785.rdf
Name: Corg_percent
Units: weight percent (wt.%)
Description: <p>sediment total organic carbon content</p>
http://lod.bco-dmo.org/id/dataset-parameter/1005786.rdf
Name: d13C_TON_permille
Units: per mille (‰)
Description: <p>Bulk stable carbon isotope value of sediment total organic nitrogen content relative to Vienna Pee Dee Belemnite (VPDB)</p>
http://lod.bco-dmo.org/id/dataset-parameter/1005787.rdf
Name: Norg_percent
Units: weight percent (wt.%)
Description: <p>sediment total organic nitrogen content</p>
http://lod.bco-dmo.org/id/dataset-parameter/1005788.rdf
Name: Comment
Units: unitless
Description: <p>Comments related to the sample collected such as physical appearance</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
35496
https://datadocs.bco-dmo.org/file/g7w6DMRtqxVXAL/1002503_v1_sediment_geochem_cb.csv
1002503_v1_sediment_geochem_cb.csv
Primary data file for dataset ID 1002503, version 1
download
https://osprey.bco-dmo.org/dataset/1002503/data/download
download
onLine
dataset
<p><strong>Core collection:</strong> Cores were collected via a gravity corer (1 meter) in July 2022 during R/V Carson cruise CB22 (R/V Carson is operated by the University of Maryland Center for Environmental Science, <a href="https://www.umces.edu/research-fleet/" target="_blank">https://www.umces.edu/research-fleet/</a>).</p>
<p><strong>Sediment and porewater extraction:</strong> For CH4, CO2, δ13C-CH4, and δ13C-CO2 measurements, a cutoff 3 milliliter (mL) syringe was inserted into pre-drilled holes in the core liner at 5 centimeters (cm) resolution. Two 3 mL sediment plugs were taken for CH4/CO2 and placed in a whirlpak bag. For porewater extraction, rhizons (19.21.23 F; Rhizosphere Research Products) were inserted into pre-drilled holes offset from the sediment holes in the core liner. A vacuum was pulled with an acid-clean 30 mL syringe to extract the porewater, then pipetted into respective containers for DIC, δ13C-DIC, DOC, δ13C-DOC, SO4, and Cl.</p>
<p><strong>Sediment/porewater sampling:</strong><br />
CH4, CO2, δ13C-CH4, δ13C-CO2: 20 mL glass serum vials containing 3-6 mL sediment preserved with 5 mL saturated brine were subsampled using the headspace equilibration method following Magen et al. (2014). Briefly, 8 mL of ultra-zero purity air (UZA) was injected into the sediment vial with a plastic syringe equipped with a 22-gauge needle. Vials were shaken, and the headspace was mixed for 2 minutes, after which 8 mL of headspace gas sample was removed. Check standards for concentration were run approximately every 5 samples and corrected as described by Pohlman and others (2021). For samples measured by cavity ring-down spectroscopy, dissolved concentrations were calculated using the following equation:</p>
<p>((pCH4 * 10^-6 * Vg) / (R * T_extraction) + (Vw * pCH4 * 10^-6 * Sol_CH4)) / Vw * 10^6 = [CH4]</p>
<p>Where pCH4 is the headspace concentration of methane in ppm, Vg is the volume of gas sample in mL, R is the gas constant in L-atm/mol-K, T_extraction is the extraction temperature in Kelvin, Vw is the volume of water sample that was extracted in mL, Sol_CH4 is the solubility of methane in mol/L-atm (Wiesenburg &amp; Guinasso, 1979; Yamamoto et al., 1976), and [CH4] is the dissolved concentration of methane in the original natural water sample, in micromoles per liter.</p>
<p>DIC and δ13C-DIC: 1 mL porewater was injected into a helium-filled 12 mL exetainer vial pre-filled with 1mL 85% phosphoric acid. The stable carbon isotope ratios and concentrations were determined from CO2 by isotope ratio mass spectrometry. Measurements are standardized with lithium carbonate reference material, and isotope ratios are reported in the standard d-notation relative to VPDB.</p>
<p>DOC and δ13C-DOC: 40 mL amber VOA vials containing 1 mL porewater sample acidified to pH 2 with trace metal clean HCl were measured with the wet oxidation method, similarly to the setup detailed in Lalonde et al. (2014). Samples are acidified and sparged to remove inorganic carbon then reacted with Sodium persulfate as wet oxidation. Data was normalized using two different internal organic standards (precision ± 0.5 ppm for concentrations and 0.2‰ for isotopes).</p>
<p>SO4 and Cl: 2 mL microcentrifuge tubes containing 40 uL porewater sample acidified to pH 2 with 0.1M H3PO4 were diluted (135x) with Milli-Q water prior to analysis. IAPSO certified seawater standards (Ocean Scientific International Ltd.) were used for all samples and precision is ±1.5%.</p>
<p>TOC and δ13C-TOC: Sediment samples from all cruises were dried at 60 degrees C for three days, then ground with a mortar and pestle. Homogenized sediment was weighed into silver capsules for acid fumigation. Samples were acid fumigated to remove carbonate and dried at 60 degrees Celsius for 2-4 hours, then wrapped into tin capsules. Samples were run on an elemental analyzer interfaced with an isotope ratio mass spectrometer. Samples were normalized to an acetanilide, protein, and bass standard calibrated to standards USGS 40 and USGS 41. Stable carbon isotope values are reported in d notation relative to VPDB.</p>
Specified by the Principal Investigator(s)
<p>Methane, carbon dioxide, and dissolved inorganic carbon concentrations and stable carbon isotope ratios: Software for Picarro was used to obtain the CH4, CO2, and DIC concentrations (ppm) as well as stable carbon isotope ratios (delta notation; per mille). Concentrations were converted to dissolved concentrations (mM) and stable carbon isotope ratios were corrected for the machine offset using Microsoft Excel.</p>
<p>Sulfate and chloride: Chromeleon 7 software was used to obtain areas for SO4 and Cl. Areas were converted to concentrations (mM) using Microsoft Excel.</p>
<p>Particulate organic carbon concentrations and stable carbon isotope ratios: EAS Clarity 3.0.0.154 and Isodat Acquisition Version 3.0 were used to obtain POC concentrations (%) and stable carbon isotope ratios (delta notation; per mille). Concentrations and stable carbon isotope ratios were corrected for machine drift using Microsoft Excel.</p>
Specified by the Principal Investigator(s)
- Imported sheet 1 from the original file "BCODMO_CB22_Sed.xlsx" into the BCO-DMO data processing system.
- Converted Sampling_Date column from string format (%m-%d-%y) to date type with output format %Y-%m-%d.
- Renamed column "Sample ID" to "Sample_ID" to comply with BCO-DMO naming conventions.
- Saved the final file as "1002503_v1_sediment_geochem_cb.csv".
Specified by BCO-DMO Data Managers
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
Costech ECS 4010 elemental analyzer
Costech ECS 4010 elemental analyzer
PI Supplied Instrument Name: Costech ECS 4010 elemental analyzer PI Supplied Instrument Description:Total organic carbon and stable carbon isotopes were measured with a Costech ECS 4010 elemental analyzer equipped with a thermal conduction detector and connected to a continuous flow isotope ratio mass spectrometer Delta V Plus (Thermo Scientific) using He as the carrier gas at Chesapeake Biological Laboratory. Instrument Name: Costech International Elemental Combustion System (ECS) 4010 Instrument Short Name:Costech ECS 4010 Instrument Description: The ECS 4010 Nitrogen / Protein Analyzer is an elemental combustion analyser for CHNSO elemental analysis and Nitrogen / Protein determination. The GC oven and separation column have a temperature range of 30-110 degC, with control of +/- 0.1 degC.
gravity corer
gravity corer
PI Supplied Instrument Name: gravity corer PI Supplied Instrument Description:Cores were collected via a gravity corer (1 m). Instrument Name: Gravity Corer Instrument Short Name:Gravity Corer Instrument Description: The gravity corer allows researchers to sample sediment layers at the bottom of lakes or oceans. The coring device is deployed from the ship and gravity carries it to the seafloor. From: http://www.whoi.edu/instruments/viewInstrument.do?id=1079 Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/51/
Thermo Scientific Aquion ion chromatograph
Thermo Scientific Aquion ion chromatograph
PI Supplied Instrument Name: Thermo Scientific Aquion ion chromatograph PI Supplied Instrument Description:Sulfate and chloride was measured with a Thermo Scientific Aquion ion chromatograph (IonPac AG22 4x50 mm guard column, IonPac AS22 4x250 mm analytical column, and AERS 300 4 mm suppressor) with an AS40 Autosampler shipboard and at Chesapeake Biological Laboratory. Instrument Name: Ion Chromatograph Instrument Short Name:Ion Chromatograph Instrument Description: Ion chromatography is a form of liquid chromatography that measures concentrations of ionic species by separating them based on their interaction with a resin. Ionic species separate differently depending on species type and size. Ion chromatographs are able to measure concentrations of major anions, such as fluoride, chloride, nitrate, nitrite, and sulfate, as well as major cations such as lithium, sodium, ammonium, potassium, calcium, and magnesium in the parts-per-billion (ppb) range. From: http://serc.carleton.edu/microbelife/research_methods/biogeochemical/ic.html
ThermoFinnigan Delta S & Delta V Plus
ThermoFinnigan Delta S & Delta V Plus
PI Supplied Instrument Name: ThermoFinnigan Delta S & Delta V Plus PI Supplied Instrument Description:DIC concentrations and carbon isotope values measured using a GasBench II system interfaced with a Delta V Plus isotope ratio mass spectrometer at the University of California Davis Stable Isotope Facility. Instrument Name: Isotope-ratio Mass Spectrometer Instrument Short Name:IR Mass Spec; IRMS Instrument Description: The Isotope-ratio Mass Spectrometer is a particular type of mass spectrometer used to measure the relative abundance of isotopes in a given sample (e.g. VG Prism II Isotope Ratio Mass-Spectrometer). Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB16/
ThermoFinnigan DELTAplus XL
ThermoFinnigan DELTAplus XL
PI Supplied Instrument Name: ThermoFinnigan DELTAplus XL PI Supplied Instrument Description:DOC_uM and DOC_d13C_permille: d13C-DOC values were quantified using a ThermoFinnigan DELTAplus XL Isotope Ratio Mass Spectrometer interfaced to the Aurora 1030C following the method of Lalonde and others (2014). Instrument Name: Isotope-ratio Mass Spectrometer Instrument Short Name:IR Mass Spec; IRMS Instrument Description: The Isotope-ratio Mass Spectrometer is a particular type of mass spectrometer used to measure the relative abundance of isotopes in a given sample (e.g. VG Prism II Isotope Ratio Mass-Spectrometer). Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB16/
AS40 Autosampler
AS40 Autosampler
PI Supplied Instrument Name: AS40 Autosampler PI Supplied Instrument Description:Sulfate and chloride was measured with a Thermo Scientific Aquion ion chromatograph (IonPac AG22 4x50 mm guard column, IonPac AS22 4x250 mm analytical column, and AERS 300 4 mm suppressor) with an AS40 Autosampler shipboard and at Chesapeake Biological Laboratory. Instrument Name: Laboratory Autosampler Instrument Short Name: Instrument Description: Laboratory apparatus that automatically introduces one or more samples with a predetermined volume or mass into an analytical instrument.
Picarro G2201-i CRDS
Picarro G2201-i CRDS
PI Supplied Instrument Name: Picarro G2201-i CRDS PI Supplied Instrument Description:Dissolved methane and carbon dioxide concentrations and stable carbon isotopes were determined using a Picarro G2201-i CRDS at US Geological Survey. Instrument Name: Picarro G2201-i isotope analyzer Instrument Short Name: Instrument Description: The G2201-i Isotopic Analyzer measures d13C for CH4 and CO2. See: https://www.picarro.com/products/g2201i_isotopic_analyzer
GasBench II
GasBench II
PI Supplied Instrument Name: GasBench II PI Supplied Instrument Description:DIC concentrations and carbon isotope values measured using a GasBench II system interfaced with a Delta V Plus isotope ratio mass spectrometer at the University of California Davis Stable Isotope Facility. Instrument Name: Thermo-Fisher Scientific Gas Bench II Instrument Short Name:GasBench II Instrument Description: An on-line gas preparation and introduction system for isotope ratio mass spectrometry that is designed for high precision isotope and molecular ratio determination of headspace samples, including water equilibration, carbonates and atmospheric gases. The instrument allows for the use of a dual viscous flow inlet system of repetitive measurements of sample and standard gas on a continuous flow isotope ratio mass spectrometer (CF-IRMS) system. The sample volume is the sample vial (instead of a metal bellows), and the reference gas volume is a pressurized gas tank. The instrument consists of a user programmable autosampler, a gas sampling system, a maintenance-free water removal system, a loop injection system, an isothermal gas chromatograph (GC), an active open split interface, a reference gas injection system with three reference ports, and one or two optional LN2 traps for cryofocusing. The gas sampling system includes a two port needle which adds a gentle flow of He into the sample vial, diluting and displacing sample gas. Water is removed from the sample gas through diffusion traps. The loop injector aliquots the sample gas onto the GC column, which separates the molecular species. The reference gas injection system allows accurate referencing of each sample aliquot to isotopic standards. The system can be used with several options including a carbonate reaction kit that allows injection of anhydrous phospohric acid into sample vials.
Note "Finnigan GasBench-II" is the previous brand name of this instrument.
Aurora 1030C
Aurora 1030C
PI Supplied Instrument Name: Aurora 1030C PI Supplied Instrument Description:d13C-DOC values were quantified using a ThermoFinnigan DELTAplus XL Isotope Ratio Mass Spectrometer interfaced to the Aurora 1030C following the method of Lalonde and others (2014). Instrument Name: Total Organic Carbon Analyzer Instrument Short Name:TOC analyzer Instrument Description: A unit that accurately determines the carbon concentrations of organic compounds typically by detecting and measuring its combustion product (CO2). See description document at: http://bcodata.whoi.edu/LaurentianGreatLakes_Chemistry/bs116.pdf Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB04/