Dataset: Sediment grain size and radiometric data
Deployment: AC18-12

Sediment grain size and radiometric data for RAPID response to Hurricane Harvey impacts

View Data: For data, See Dataset Metadata Page: https://www.bco-dmo.org/dataset/825252

Principal Investigator:

Kanchan Maiti (Louisiana State University, LSU-DOCS)

BCO-DMO Data Manager:

Dana Stuart Gerlach (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Collaborative Research: A RAPID response to Hurricane Harvey's impacts on coastal carbon cycle, metabolic balance and ocean acidification (HarveyCarbonCycle)

Version:

Deployment Synonyms:

AC18_12_Roberts, GOM_Discrete_1709, GOM_Nutrients_1709

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Description

Methods & Sampling

Dataset acquisition description

Sediments of the northwestern Gulf of Mexico were analyzed for grain size and radiometric data (²¹⁰Pb, ²³⁴Th, and ⁷Be) to assess Hurricane Harvey impacts. Samples were collected from the Louisiana-Texas shelf in September and October 2017 using the ship R/V Acadiana. Sediment cores were obtained using a multi corer and subsampled at 2 cm depth intervals.

Sediment core subsamples were dried, homogenized, and subsequently analyzed. Grain size distribution was determined using laser diffraction after deflocculation in a 0.05% sodium metaphosphate solution, and disaggregation with an ultrasonic probe (Denommee et al., 2016). Radiometric data (²¹⁰Pb, ²³⁴Th, and ⁷Be) were obtained using gamma spectroscopy (Maiti et al., 2010).

Data Processing Description

Dataset Processing Description

BCO-DMO processing notes:
- Converted datetimes to ISO8601 format (UTC format)
- Adjusted parameter names to comply with database requirements
- Rounded values to submitter's preferred number of digits
- Units added to Parameter description metadata section
- Added a conventional header with dataset name, PI name, version date.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1760648	NSF Division of Ocean Sciences

Instruments

Gamma Ray Spectrometer

Supplied Name: Canberra Germanium Well Detectors GCW3523 and GCW4023

Supplied Description:

The CANBERRA High-Purity Germanium Well Detector provides maximum efficiency for small samples and allows spectroscopy from 20keV up to 10MeV. (More details in manual, http://www.gammadata.se/assets/Uploads/Germanium-Well-SS-C49321.pdf)

Instrument Type

Generic Name: Gamma Ray Spectrometer

Generic Description:

Instruments measuring the relative levels of electromagnetic radiation of different wavelengths in the gamma-ray waveband.

Laser Diffraction Particle Size Analyzer

Supplied Name: Beckman-Coulter LS13 320 Laser Diffraction Particle-Size Analyzer

Supplied Description:

The Beckman Coulter LS 13 320 measures the size distribution of particles suspended either in a liquid or in dry powder form by using the principles of light scattering. Each particle's scattering pattern is characteristic of its size. The pattern measured by the LS 13 320 is the sum of the patterns scattered by each constituent particle in the sample.The LS 13 320 incorporates Beckman Coulter's patented PIDS (Polarization Intensity Differential Scattering) technology to provide a dynamic range of 0.017 μm to 2000 μm. (More details in the manual, https://www.beckmancoulter.com/wsrportal/techdocs?docname=B05577AB.pdf)

Instrument Type

Generic Name: Laser Diffraction Particle Size Analyzer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/150/

Generic Description:

Laser diffraction is particle sizing technique for materials ranging from hundreds of nanometers up to several millimeters in size. Laser diffraction measures particle size distributions by measuring the angular variation in intensity of light scattered as a laser beam passes through a dispersed particulate sample. One example is the Beckman Coulter LS200.

Multi Corer

Supplied Name: Multi corer

Supplied Description:

Sediment cores were obtained using a multi corer and subsampled at 2 cm depth intervals.

Instrument Type

Generic Name: Multi Corer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/51/

Generic 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.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
ISO_DateTime_UTC	UTC datetime in ISO format (yyyy-mm-dd hh:mm:ss)	unitless	ISO_DateTime_UTC
Latitude	Latitude	decimal degrees	lat
Longitude	Longitude, west is negative	decimal degrees	lon
Be7_Inventory	Inventory of Beryllium-7	disintegrations per minute per centimeter squared (dpm/cm^2)	Be
Pb210ex_Inventory	Inventory of excess (unsupported) Lead-210	disintegrations per minute per centimeter squared (dpm/cm^2)	Pb
Th234ex_Inventory	Inventory of excess Thorium-234	disintegrations per minute per centimeter squared (dpm/cm^2)	Th234
Be7_Depth	Penetration depth of Be-7 detection	centimeters (cm)	depth
Clay	Sediment grain size in the clay fraction	percent (%)	clay
Silt	Sediment grain size in the sand fraction	percent (%)	silt
Sand	Sediment grain size in the silt fraction	percent (%)	sand

Database

Contribute Data

Dataset: Sediment grain size and radiometric data
Deployment: AC18-12

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Sediment grain size and radiometric dataDeployment: AC18-12

Dataset acquisition description

Dataset Processing Description

Dataset: Sediment grain size and radiometric data
Deployment: AC18-12