http://lod.bco-dmo.org/id/dataset/963692
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
2025-06-05
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Thermogravimetric analysis (TGA) for precipitate from shipboard ocean alkalinity enhancement (OAE) experiments in the North Atlantic on R/V Atlantic Explorer cruise AE2320 in September 2023
2025-06-11
publication
2025-06-11
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2025-06-30
publication
https://doi.org/10.26008/1912/bco-dmo.963692.1
Mohammed Hashim
Woods Hole Oceanographic Institution
principalInvestigator
Adam V. Subhas
Woods Hole Oceanographic Institution
principalInvestigator
Frieder Klein
Woods Hole Oceanographic Institution
principalInvestigator
Lukas Marx
Woods Hole Oceanographic Institution
principalInvestigator
Daniel C. McCorkle
Woods Hole Oceanographic Institution
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: Hashim, M., Marx, L., Klein, F., Dean, C., Burdige, E., Hayden, M. G., McCorkle, D. C., Subhas, A. V. (2025) Thermogravimetric analysis (TGA) for precipitate from shipboard ocean alkalinity enhancement (OAE) experiments in the North Atlantic on R/V Atlantic Explorer cruise AE2320 in September 2023. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2025-06-11 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.963692.1 [access date]
TGA for OAE North Atlantic experiments Dataset Description: Methods and Sampling: <p>Experiments involved the addition of NaOH solution prepared by weighing ACS grade NaOH in the lab prior to the cruise (R/V Atlantic Explorer AE2320) in a plastic Falcon tube that was capped and sealed with parafilm tape. During the cruise, DI water was added to make up stock NaOH solutions with a final concentration of 1 M. The NaOH solution was pipetted into the seawater-filled bags through the Luer-fitted stopcock. Because NaOH contributes only alkalinity but not DIC, seawater in the experiments was out of equilibrium with the atmosphere, which was intended to simulate conditions immediately following alkalinity addition to seawater during OAE deployments.</p>
<p>In total, 5 experiments were conducted. The first experiment (experiment A) was a control with no alkalinity addition. In the second, third, and fourth experiments (B, C, and D), alkalinity was enhanced by 500, 1000, and 2000 micromoles per kilogram (µmol/kg) respectively. The fifth experiment (E) represents a set of "sacrificial" time series experiments whereby 9 bags were prepared similar to other experiments and alkalinity was enhanced by 1000 µmol/kg in each one of them, but each bag was sequentially opened and filtered in order to evaluate the precipitate mineralogy through time. In experiment E, water samples for TA and DIC measurements were taken only at the end of the experiment. The experiments were run for approximately 5 days.</p>
<p>A TA Instruments Q600 simultaneous thermal analyzer was used for thermogravimetric analysis and differential scanning calorimetry of mineral precipitates from Experiment D. About 35 mg was heated from room temperature to 1100°C with a heating rate of 10°C per minute in a N2 atmosphere. The N2 flow rate was 50 mL.min-1. Routine measurements of standard materials supplied by the manufacturer indicate that the temperature is accurate to 1 degree Celsius (°C) and the weight change to 0.5 μg.</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-2205984 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=2205984
completed
Mohammed Hashim
Woods Hole Oceanographic Institution
hashimm@usc.edu
pointOfContact
Adam V. Subhas
Woods Hole Oceanographic Institution
508-289-2399
266 Woods Hole Rd. MS#8
Woods Hole
MA
02543
USA
asubhas@whoi.edu
pointOfContact
Frieder Klein
Woods Hole Oceanographic Institution
508-289-3355
Marine Chemistry and Geochemistry Department Room 214 McLean, MS#8
Woods Hole
MA
02543
USA
fklein@whoi.edu
pointOfContact
Lukas Marx
Woods Hole Oceanographic Institution
Marine Chemistry & Geochemistry
Woods Hole
MA
02543
USA
lukas.marx@whoi.edu
pointOfContact
Daniel C. McCorkle
Woods Hole Oceanographic Institution
508-289-2949
Geology & Geophysics 266 Woods Hole Rd MS #08
Woods Hole
MA
02543
USA
dmccorkle@whoi.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Time
Temperature
Weight_mg
Weight_pcnt
first_derivative
Heat_Flow
Temperature_Difference_C
Temperature_Difference_uV
Sample_Purge_Flow
TA Instruments Q600
theme
None, User defined
time_elapsed
water temperature at measurement depth
weight
mass
No BCO-DMO term
flow rate
featureType
BCO-DMO Standard Parameters
TA Instruments SDT Q600 simultaneous thermal analyzer
instrument
BCO-DMO Standard Instruments
AE2320
service
Deployment Activity
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.
OCE-PRF: Towards Quantifying Calcium Carbonate Sediment Dissolution During Marine Diagenesis
https://osprey.bco-dmo.org/project/955330
OCE-PRF: Towards Quantifying Calcium Carbonate Sediment Dissolution During Marine Diagenesis
<p><em>NSF Award Abstract:</em><br />
OCE-PRF Towards Quantifying Calcium Carbonate Sediment Dissolution During Marine Diagenesis The goal of the project is to investigate dissolution of calcium carbonate (CaCO3) in sediments below the seafloor and determine its importance to the chemistry of seawater. This project uses sediment samples and chemical data collected from different parts of the ocean during the past five decades by scientific ocean drilling programs. Sediment dissolution of carbonate can lessen the impact of ocean acidification, the process that causes the pH of the ocean to decrease due to the uptake of carbon dioxide (CO2) from the atmosphere. Ocean acidification threatens the survival of marine organisms, such as oysters, clams, and coral reefs, which could alter marine food chains and food supply to humans. By improving understanding of carbonate dissolution in the ocean, results from this project will enable better predictions of the effects of ocean acidification on marine organisms. This will advance the progress of science and contribute to the knowledge that can inform public policy. In addition, understanding carbonate sediment dissolution serves other important purposes. For example, dissolution can create small spaces between sediments that may get filled with groundwater once sediments convert to rocks over millions of years. Thus, understanding the occurrence and spatial distribution of spaces within rocks may help determine the volume and movement of groundwater in subsurface aquifers. This project provides support for a postdoctoral research fellow and research training opportunities for students through the Summer Student Fellowship and Woods Hole-wide Partnership Education Programs at the Woods Hole Oceanographic Institution.</p>
<p>Carbonate mineral dissolution is an integral part of the alkalinity and carbon cycles in the ocean and is expected to play an increasingly significant role in mediating changes in ocean chemistry as atmospheric CO2 continues to rise. The goal of this project is to provide thermodynamic constraints necessary for quantifying carbonate sediment dissolution in marine diagenetic environments. Specifically, the CaCO3 saturation state of pore fluids will be calculated in 365 globally distributed sites from previous scientific ocean drilling expeditions using a specially developed Pitzer ion activity model which is particularly useful for calculating activity coefficients in high ionic strength solutions such as those that characterize most diagenetic environments. These calculations will be substantiated with geochemical and textural analyses of sediment samples from four representative sites to identify the specific diagenetic processes (e.g., dissolution, precipitation, and recrystallization) and document the conditions responsible for their occurrence and prevalence. The immediate advantage of calculating the saturation state of pore fluids is that such data can be used to estimate carbonate sediment dissolution below the seafloor and quantify its contribution to the alkalinity and carbon cycles, which will lead to more accurate predictions of the consequences of ocean acidification. Another benefit of the global saturation state dataset is that it will improve our understanding of authigenic carbonate precipitation and its link to the carbon cycle over Earth history, which has been proposed as a significant sink for carbon. Furthermore, by complementing the thermodynamic calculations with textural and geochemical analyses, this project will parse out various diagenetic processes and identify the sedimentological and geochemical conditions responsible for their occurrence. Such knowledge is crucial for evaluating the impact of diagenesis on the carbonate-hosted paleoenvironmental proxies. Collectively, this project will pave the way towards a mechanistic understanding of carbonate diagenesis. This will provide important constraints on the oceanic alkalinity cycle, carbon burial rates, and geochemical proxies, which ultimately help us better understand the future of our ocean system in the context of climate change.</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>
Marine CaCO3 and ocean chemistry
largerWorkCitation
project
eng; USA
oceans
-64.1667
-64.1667
31.6667
31.6667
2023-09-05
2023-09-11
0
BCO-DMO catalogue of parameters from Thermogravimetric analysis (TGA) for precipitate from shipboard ocean alkalinity enhancement (OAE) experiments in the North Atlantic on R/V Atlantic Explorer cruise AE2320 in September 2023
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/964852.rdf
Name: Time
Units: minutes
Description: <p>The elapsed time since the start of the TGA experiment in minutes.</p>
http://lod.bco-dmo.org/id/dataset-parameter/964853.rdf
Name: Temperature
Units: degrees Celsius
Description: <p>The temperature of the sample during the analysis in degrees Celsius.</p>
http://lod.bco-dmo.org/id/dataset-parameter/964854.rdf
Name: Weight_mg
Units: milligrams (mg)
Description: <p>The absolute mass of the sample at a given time/temperature in milligrams.</p>
http://lod.bco-dmo.org/id/dataset-parameter/964855.rdf
Name: Weight_pcnt
Units: percent
Description: <p>The relative mass of the sample, expressed as a percentage of the initial weight.</p>
http://lod.bco-dmo.org/id/dataset-parameter/964856.rdf
Name: first_derivative
Units: unitless
Description: <p>The first derivative of the weight loss curve, indicating the rate of weight change, which helps identify decomposition events.</p>
http://lod.bco-dmo.org/id/dataset-parameter/964857.rdf
Name: Heat_Flow
Units: milliwatts (mW)
Description: <p>The thermal energy flow into or out of the sample in milliwatts</p>
http://lod.bco-dmo.org/id/dataset-parameter/964858.rdf
Name: Temperature_Difference_C
Units: degrees Celsius
Description: <p>The temperature difference between the sample and reference in degrees Celsius.</p>
http://lod.bco-dmo.org/id/dataset-parameter/964859.rdf
Name: Temperature_Difference_uV
Units: microvolts (uV)
Description: <p>The temperature difference between the sample and reference expressed in microvolts</p>
http://lod.bco-dmo.org/id/dataset-parameter/964860.rdf
Name: Sample_Purge_Flow
Units: milliliters per minute (mL/min)
Description: <p>The flow rate of the purge gas over the sample in milliliter per minute.</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
921546
https://darchive.mblwhoilibrary.org/server/api/core/bitstreams/43555da8-2dea-4fe8-9807-927f4c82c0b7/content
download
https://doi.org/10.26008/1912/bco-dmo.963692.1
download
onLine
dataset
<p>Experiments involved the addition of NaOH solution prepared by weighing ACS grade NaOH in the lab prior to the cruise (R/V Atlantic Explorer AE2320) in a plastic Falcon tube that was capped and sealed with parafilm tape. During the cruise, DI water was added to make up stock NaOH solutions with a final concentration of 1 M. The NaOH solution was pipetted into the seawater-filled bags through the Luer-fitted stopcock. Because NaOH contributes only alkalinity but not DIC, seawater in the experiments was out of equilibrium with the atmosphere, which was intended to simulate conditions immediately following alkalinity addition to seawater during OAE deployments.</p>
<p>In total, 5 experiments were conducted. The first experiment (experiment A) was a control with no alkalinity addition. In the second, third, and fourth experiments (B, C, and D), alkalinity was enhanced by 500, 1000, and 2000 micromoles per kilogram (µmol/kg) respectively. The fifth experiment (E) represents a set of "sacrificial" time series experiments whereby 9 bags were prepared similar to other experiments and alkalinity was enhanced by 1000 µmol/kg in each one of them, but each bag was sequentially opened and filtered in order to evaluate the precipitate mineralogy through time. In experiment E, water samples for TA and DIC measurements were taken only at the end of the experiment. The experiments were run for approximately 5 days.</p>
<p>A TA Instruments Q600 simultaneous thermal analyzer was used for thermogravimetric analysis and differential scanning calorimetry of mineral precipitates from Experiment D. About 35 mg was heated from room temperature to 1100°C with a heating rate of 10°C per minute in a N2 atmosphere. The N2 flow rate was 50 mL.min-1. Routine measurements of standard materials supplied by the manufacturer indicate that the temperature is accurate to 1 degree Celsius (°C) and the weight change to 0.5 μg.</p>
Specified by the Principal Investigator(s)
- Imported original file "Hashim et al OAE resaerch data_TGA.xlsx" into the BCO-DMO system.
- Flagged "NA" as a missing data identifier (missing data are blank/empty in the final CSV file).
- Renamed fields to comply with BCO-DMO naming conventions.
- Saved the final file as "963692_v1_tga.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
TA Instruments Q600
TA Instruments Q600
PI Supplied Instrument Name: TA Instruments Q600 PI Supplied Instrument Description:A TA Instruments Q600 simultaneous thermal analyzer was used for thermogravimetric analysis and differential scanning calorimetry of mineral precipitates. Instrument Name: TA Instruments SDT Q600 simultaneous thermal analyzer Instrument Short Name:TA Instruments Q600 Instrument Description: The SDT Q600 is a combined thermogravimetric analyzer (TGA) and differential scanning calorimeter (DSC) that provides simultaneous measurement of weight change and true differential heat flow on the same sample from ambient to 1500 degrees C. It has a dual-beam design with automatic beam growth compensation and the ability to analyze 2 TGA samples simultaneously. DSC heat flow data is dynamically normalised using the instantaneous sample weight at any given temperature. The setup comprises a horizontal furnace encased in perforated stainless steel, a purge gas system with digital mass flow control, and a dual balance mechanism to enhance precision. The instrument has a DTA sensitivity of 0.001 degrees C, a calorimetric precision of +/- 2 %, and a heating rate of 0.1 to 25 degrees C per minute.
Cruise: AE2320
AE2320
R/V Atlantic Explorer
Community Standard Description
International Council for the Exploration of the Sea
R/V Atlantic Explorer
vessel
AE2320
Benjamin A.S. Van Mooy
Woods Hole Oceanographic Institution
R/V Atlantic Explorer
Community Standard Description
International Council for the Exploration of the Sea
R/V Atlantic Explorer
vessel