Dataset: Brazos Plume Core Data

Name: Core data collected in the Brazos River Plume, TX during 2017-2018
Published: 2021-03-11
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.844548.1

Spatial Extent: N:28.8746 E:-95.25045 S:28.6391533 W:-95.520612

Temporal Extent: 2017-09-10 - 2018-07-12

Project:

NSFOCE-BSF: Collaborative Research: The Role and Mechanisms of Nuclei-induced Calcium Carbonate Precipitation in the Coastal Carbon Cycle: A First In-depth Study (Nuclei CaCO3 Precip)

RAPID: Collaborative Research: Tracking the Flood Pulse of a Record Discharge of the Brazos River in the Gulf of Mexico (Flood Pulse Brazos)

Principal Investigator:

Timothy M. Dellapenna (Texas A&M, Galveston, TAMUG)

Co-Principal Investigator:

James Churchill (Woods Hole Oceanographic Institution, WHOI)

Zhaohui Aleck Wang (Woods Hole Oceanographic Institution, WHOI)

Contact:

Timothy M. Dellapenna (Texas A&M, Galveston, TAMUG)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2021-03-11

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Core data collected in the Brazos River Plume, TX during 2017-2018

Abstract:

Core data collected in the Brazos River Plume, TX during three cruises conducted in 2017 and 2018. Cores were analyzed for grain size and mercury content.

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2021-03-11	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.844548.1	2021-03-11

Description

This dataset contains core data collected in the Brazos River Plume, TX during three cruises conducted in 2017 and 2018. Cores were analyzed for grain size and mercury content. The sample collection that took place on September 10, 2017 was supported by NSF award OCE-1635893. Award OCE-1829221 supported the rest of the data collection.

Methods & Sampling

Data were collected on three cruises on the Brazos River Plume in the Northern Gulf of Mexico. Cores were collected from: 11 stations on September 10, 2017; 23 stations on October 29, 2017; and 26 stations on July 12, 2018. The September 2017 cruise was conducted on R/V Pelican (PE18-09); the two subsequent cruises were conducted on R/V Trident.

On each cruise, a series of box cores were collected in a grid pattern. From those box cores, a series of sub-cores were collected. Those included: x-radiograph trays, a 3-inch aluminum and/or polycarbonate core, and a 6-inch core. They were stored in a refrigerator at 2 °C and later split into 1 cm sections, x-rayed, and stored in bags until further analysis.

To collect water content, a basic oven was used at 60 °C. They were dried in pre-weighed aluminum tins, and then the water content was calculated after weighing the dry weight.

The grain size was processed in a Malvern Mastersizer 2000 that uses laser diffraction to analyze the grains.

The Mercury content was analyzed in a Milestone DMA-80 that combusts the sample to get a total mercury content.

Data Processing Description

Data Processing: Most of the data were processed in Excel, Matlab R2020a, or ArcPro 2.6.3. The data were stored in Excel sheets, then graphs and maps were created using Matlab or ArcPro.

BCO-DMO Processing:
- concatenated three separate data files into one dataset;
- added Date column;
- re-named fields to conform with BCO-DMO naming conventions (replaced spaces with underscores);
- rounded Hg_Content and Water_Content columns.

Data Files

File
brazos_core.csv (Comma Separated Values (.csv), 84.06 KB) MD5:6321857065e773508e70c06adb1b4872 Primary data file for dataset ID 844548

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1829221
NSF Division of Ocean Sciences	OCE-1635893

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
Brazos_Harvey_Cruises		2017-10-29	R/V Trident		data info
PE18-09		2017-09-09	R/V Pelican	Zhaohui Aleck Wang (Chief Scientist)	data info

Instruments

Box Corer

Supplied Name: box cores

Supplied Description:

Instrument Type

Generic Name: Box Corer

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

Generic Description:

General description of a box corer:

A box corer is a marine geological tool that recovers undisturbed soft surface sediments. It is designed for minimum disturbance of the sediment surface by bow wave effects. Traditionally, it consists of a weighted stem fitted to a square sampling box. The corer is lowered vertically until it impacts with the seabed. At this point the instrument is triggered by a trip as the main coring stem passes through its frame. While pulling the corer out of the sediment a spade swings underneath the sample to prevent loss. When hauled back on board, the spade is under the box. (definition from the SeaVox Device Catalog)

Box corers are one of the simplest and most commonly used types of sediment corers. The stainless steel sampling box can contain a surface sediment block as large as 50cm x 50cm x 75cm with negligible disturbance. Once the sediment is recovered onboard, the sediment box can be detached from the frame and taken to a laboratory for subsampling and further analysis. The core sample size is controlled by the speed at which the corer is lowered into the ocean bottom. When the bottom is firm, a higher speed is required to obtain a complete sample. A depth pinger or other depth indicator is generally used to determine when the box is completely filled with sediment. Once the core box is filled with sediment, the sample is secured by moving the spade-closing lever arm to lower the cutting edge of the spade into the sediment, until the spade completely covers the bottom of the sediment box. (definition from Woods Hole Oceanographic Institution).

Laser Diffraction Particle Size Analyzer

Supplied Name: Malvern Mastersizer 2000

Supplied Description:

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.

Milestone Direct Mercury Analyzer

Supplied Name: Milestone DMA-80

Supplied Description:

Instrument Type

Generic Name: Milestone Direct Mercury Analyzer

Acronym: DMA-80

Generic Description:

The Milestone DMA-80 is a mercury analyzer used to determine mercury concentrations in liquid and solid samples. The DMA-80 is based on the principles of sample thermal decomposition, mercury amalgamation, and atomic absorption detection. See more: https://milestonesci.com/direct-mercury-analyzer/

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
Date	Date of sample collection; format: YYYY-MM-DD Format: %Y-%m-%d	unitless	date
Core_Name	Site name	unitless	sample
Lat	Latitude	decimal degrees North	lat
Long	Longitude	decimal degrees East	lon
Depth	Depth in the sediment	centimeters (cm)	depth_core
Water_Content	Percent water in sample	unitless (percent)	no_bcodmo_term
Hg_Content	Total Mercury in sample	micrograms per kilogram (ug/kg)	total_Hg
Sand	Percent Sand size	unitless (percent)	sed_grain_size
Silt	Percent Silt size	unitless (percent)	sed_grain_size
Clay	Percent Clay size	unitless (percent)	sed_grain_size
STD	Standard deviation of grain size	micrometers (um)	sed_grain_size
D50	Median grain size	micrometers (um)	sed_grain_size

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Database

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Dataset: Brazos Plume Core Data