ERDDAP > info > bcodmo_dataset_782858

Grid DAP Data	Sub- set	Table DAP Data	Make A Graph	W M S	Source Data Files	Acces- sible	Title	Sum- mary	FGDC, ISO, Metadata	Back- ground Info	RSS	E mail	Institution	Dataset ID
		data	graph		files	public	[Guaymas Sedimentary Radium AT37-06] - Sedimentary radium isotope activity around Guaymas Basin from samples collected by HOV Alvin during R/V Atlantis cruise AT37-06 in December 2016 (Validation of a New Geochemical Approach to Constrain Deep Sea Porewater Residence Times and Advection Rates: Applications to Biogeochemical Cycling at Guaymas Basin)		F   I   M	background			BCO-DMO	bcodmo_dataset_782858

The Dataset's Variables and Attributes

Row Type	Variable Name	Attribute Name	Data Type	Value
attribute	NC_GLOBAL	access_formats	String	.htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson,.odvTxt
attribute	NC_GLOBAL	acquisition_description	String	Samples for this dataset were collected as push cores using the HOV Alvin submersible. Analytical methods for measuring particulate Ra-224 and Th-228 are based on methods described in Cai et al. (2012; 2014). In short, once the cores were recovered on the ship, overlying waters were siphoned off and the sediment cores were sectioned in 2 cm vertical intervals for the top 10 cm, then 4 cm intervals for the remainder of the core. A slurry was prepared by adding ~\u00bc of the sediment volume (or ~1/8 of the sediment volume for the 4 cm intervals) to 150 mL of Ra-free tap water. The pH of the slurry was adjusted by adding 5-10 drops of concentrated NH3-OH, after which 1 mL of 19 mM KMnO4 and 1 mL of 40 mM MnCl2 solutions were added to precipitate any dissolved radium and thorium. A portion of this slurry was vacuum-filtered onto pre-weighed 47 mm diameter GFF filters until no further drops passed through the filter. Filters were dried in a drying oven (at 60 \u00b0C) for 12 hours, then placed is a filter holder within a cartridge and counted on a Radium Delayed Coincidence Counter (Moore and Arnold, 1996). Results from this analysis represent particulate Ra-224 activities. Filters were then measured on the Radium Delayed Coincidence Counter again after 3 weeks, from which the results are representative of Th-228 activities on the sediments.
attribute	NC_GLOBAL	awards_0_award_nid	String	754842
attribute	NC_GLOBAL	awards_0_award_number	String	OCE-1558829
attribute	NC_GLOBAL	awards_0_data_url	String	http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1558829
attribute	NC_GLOBAL	awards_0_funder_name	String	NSF Division of Ocean Sciences
attribute	NC_GLOBAL	awards_0_funding_acronym	String	NSF OCE
attribute	NC_GLOBAL	awards_0_funding_source_nid	String	355
attribute	NC_GLOBAL	awards_0_program_manager	String	Henrietta N Edmonds
attribute	NC_GLOBAL	awards_0_program_manager_nid	String	51517
attribute	NC_GLOBAL	cdm_data_type	String	Other
attribute	NC_GLOBAL	comment	String	Guaymas Sedimentary Radium from cruise AT37-06 PI: Richard Peterson Version date: 25-Nov-2019
attribute	NC_GLOBAL	Conventions	String	COARDS, CF-1.6, ACDD-1.3
attribute	NC_GLOBAL	creator_email	String	info at bco-dmo.org
attribute	NC_GLOBAL	creator_name	String	BCO-DMO
attribute	NC_GLOBAL	creator_type	String	institution
attribute	NC_GLOBAL	creator_url	String	https://www.bco-dmo.org/
attribute	NC_GLOBAL	data_source	String	extract_data_as_tsv version 2.3 19 Dec 2019
attribute	NC_GLOBAL	date_created	String	2019-11-25T20:57:28Z
attribute	NC_GLOBAL	date_modified	String	2019-12-09T17:26:51Z
attribute	NC_GLOBAL	defaultDataQuery	String	&time<now
attribute	NC_GLOBAL	doi	String	10.1575/1912/bco-dmo.782858.1
attribute	NC_GLOBAL	Easternmost_Easting	double	-111.38469
attribute	NC_GLOBAL	geospatial_lat_max	double	27.50622
attribute	NC_GLOBAL	geospatial_lat_min	double	27.00729
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	double	-111.38469
attribute	NC_GLOBAL	geospatial_lon_min	double	-111.68317
attribute	NC_GLOBAL	geospatial_lon_units	String	degrees_east
attribute	NC_GLOBAL	infoUrl	String	https://www.bco-dmo.org/dataset/782858
attribute	NC_GLOBAL	institution	String	BCO-DMO
attribute	NC_GLOBAL	instruments_0_acronym	String	Tube Core
attribute	NC_GLOBAL	instruments_0_dataset_instrument_description	String	Samples for this dataset were collected as push cores using the HOV Alvin submersible.
attribute	NC_GLOBAL	instruments_0_dataset_instrument_nid	String	782868
attribute	NC_GLOBAL	instruments_0_description	String	A plastic tube, about 40 cm (16 inches) long, is pushed into the sediment by Alvin's manipulator arm to collect a sediment core.
attribute	NC_GLOBAL	instruments_0_instrument_name	String	Alvin tube core
attribute	NC_GLOBAL	instruments_0_instrument_nid	String	641
attribute	NC_GLOBAL	instruments_1_acronym	String	RaDeCC
attribute	NC_GLOBAL	instruments_1_dataset_instrument_description	String	Filters were dried in a drying oven (at 60 °C) for 12 hours, then placed is a filter holder within a cartridge and counted on a Radium Delayed Coincidence Counter.
attribute	NC_GLOBAL	instruments_1_dataset_instrument_nid	String	782869
attribute	NC_GLOBAL	instruments_1_description	String	The RaDeCC is an alpha scintillation counter that distinguishes decay events of short-lived radium daughter products based on their contrasting half-lives. This system was pioneered by Giffin et al. (1963) and adapted for radium measurements by Moore and Arnold (1996). References: Giffin, C., A. Kaufman, W.S. Broecker (1963). Delayed coincidence counter for the assay of actinon and thoron. J. Geophys. Res., 68, pp. 1749-1757. Moore, W.S., R. Arnold (1996). Measurement of 223Ra and 224Ra in coastal waters using a delayed coincidence counter. J. Geophys. Res., 101 (1996), pp. 1321-1329. Charette, Matthew A.; Dulaiova, Henrieta; Gonneea, Meagan E.; Henderson, Paul B.; Moore, Willard S.; Scholten, Jan C.; Pham, M. K. (2012). GEOTRACES radium isotopes interlaboratory comparison experiment. Limnology and Oceanography - Methods, vol 10, pg 451.
attribute	NC_GLOBAL	instruments_1_instrument_name	String	Radium Delayed Coincidence Counter
attribute	NC_GLOBAL	instruments_1_instrument_nid	String	688
attribute	NC_GLOBAL	keywords	String	activity, alivn, Alivn_Dive_Num, bco, bco-dmo, biological, chemical, core, Core_Num, data, dataset, date, depth, Depth_Below_SWI, dive, dmo, erddap, filter, Filter_Mass, latitude, longitude, management, mass, num, oceanography, office, preliminary, ra224, Ra224_Activity, Ra224_Unc, th228, Th228_Activity, Th228_Unc, time, unc
attribute	NC_GLOBAL	license	String	https://www.bco-dmo.org/dataset/782858/license
attribute	NC_GLOBAL	metadata_source	String	https://www.bco-dmo.org/api/dataset/782858
attribute	NC_GLOBAL	Northernmost_Northing	double	27.50622
attribute	NC_GLOBAL	param_mapping	String	{'782858': {'Latitude': 'flag - latitude', 'Date_Time': 'flag - time', 'Longitude': 'flag - longitude'}}
attribute	NC_GLOBAL	parameter_source	String	https://www.bco-dmo.org/mapserver/dataset/782858/parameters
attribute	NC_GLOBAL	people_0_affiliation	String	Coastal Carolina University
attribute	NC_GLOBAL	people_0_person_name	String	Richard N. Peterson
attribute	NC_GLOBAL	people_0_person_nid	String	701779
attribute	NC_GLOBAL	people_0_role	String	Principal Investigator
attribute	NC_GLOBAL	people_0_role_type	String	originator
attribute	NC_GLOBAL	people_1_affiliation	String	Woods Hole Oceanographic Institution
attribute	NC_GLOBAL	people_1_affiliation_acronym	String	WHOI BCO-DMO
attribute	NC_GLOBAL	people_1_person_name	String	Shannon Rauch
attribute	NC_GLOBAL	people_1_person_nid	String	51498
attribute	NC_GLOBAL	people_1_role	String	BCO-DMO Data Manager
attribute	NC_GLOBAL	people_1_role_type	String	related
attribute	NC_GLOBAL	project	String	Guaymas Basin Ra 224 Approach
attribute	NC_GLOBAL	projects_0_acronym	String	Guaymas Basin Ra 224 Approach
attribute	NC_GLOBAL	projects_0_description	String	NSF Award Abstract: This project proposes to validate a new approach to measure porewater flow dynamics from deep sea sediments using a biologically conservative, naturally-occurring tracer, Radium 224, which is constantly produced by porewaters. The technique will be validated using independent measures of porewater fluxes (i.e. heat gradients and magnesium profiles) during a cruise to the Guaymas Basin in the Gulf of California that is already funded by NSF. Once validated the technique will be broadly applicable to all sedimentary environments including oceans, rivers/streams, wetlands and lakes. Understanding porewater flow dynamics is important to understanding ocean and other aquatic system chemical budgets, microbial ecology and global heat flow. This proposal hypothesizes that the short-lived radium isotope Ra 224 may serve as an effective tracer of porewater flows in deep ocean systems, regardless of the type or composition of seepages, because its sources and sinks can be uniquely constrained. The method will be tested in the Guaymas Basin which is comprised of areas undergoing a range of seepage rates and offers porewater thermal gradients resulting from the hydrothermal system. As a result heat fluxes and gradients in magnesium and other cations affected by high-temperature water/rock interactions can be used to independently validate the porewater flows measured by Ra 224.
attribute	NC_GLOBAL	projects_0_end_date	String	2019-07
attribute	NC_GLOBAL	projects_0_geolocation	String	Guaymas Basin, Gulf of California
attribute	NC_GLOBAL	projects_0_name	String	Validation of a New Geochemical Approach to Constrain Deep Sea Porewater Residence Times and Advection Rates: Applications to Biogeochemical Cycling at Guaymas Basin
attribute	NC_GLOBAL	projects_0_project_nid	String	754843
attribute	NC_GLOBAL	projects_0_start_date	String	2016-02
attribute	NC_GLOBAL	publisher_name	String	Biological and Chemical Oceanographic Data Management Office (BCO-DMO)
attribute	NC_GLOBAL	publisher_type	String	institution
attribute	NC_GLOBAL	sourceUrl	String	(local files)
attribute	NC_GLOBAL	Southernmost_Northing	double	27.00729
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v55
attribute	NC_GLOBAL	summary	String	This dataset presents sedimentary radium isotope activities around Guaymas Basin.
attribute	NC_GLOBAL	time_coverage_end	String	2016-12-24T17:58Z
attribute	NC_GLOBAL	time_coverage_start	String	2016-12-12T19:00Z
attribute	NC_GLOBAL	title	String	[Guaymas Sedimentary Radium AT37-06] - Sedimentary radium isotope activity around Guaymas Basin from samples collected by HOV Alvin during R/V Atlantis cruise AT37-06 in December 2016 (Validation of a New Geochemical Approach to Constrain Deep Sea Porewater Residence Times and Advection Rates: Applications to Biogeochemical Cycling at Guaymas Basin)
attribute	NC_GLOBAL	version	String	1
attribute	NC_GLOBAL	Westernmost_Easting	double	-111.68317
attribute	NC_GLOBAL	xml_source	String	osprey2erddap.update_xml() v1.3
variable	Alivn_Dive_Num		short
attribute	Alivn_Dive_Num	_FillValue	short	32767
attribute	Alivn_Dive_Num	actual_range	short	4861, 4872
attribute	Alivn_Dive_Num	bcodmo_name	String	dive_id
attribute	Alivn_Dive_Num	description	String	Numeric identifier for Alvin dive
attribute	Alivn_Dive_Num	long_name	String	Alivn Dive Num
attribute	Alivn_Dive_Num	units	String	unitless
variable	Core_Num		byte
attribute	Core_Num	_FillValue	byte	127
attribute	Core_Num	actual_range	byte	1, 31
attribute	Core_Num	bcodmo_name	String	core_id
attribute	Core_Num	description	String	Core tube identifier for the specific Alvin dive
attribute	Core_Num	long_name	String	Core Num
attribute	Core_Num	units	String	unitless
variable	Depth_Below_SWI		byte
attribute	Depth_Below_SWI	_FillValue	byte	127
attribute	Depth_Below_SWI	actual_range	byte	1, 44
attribute	Depth_Below_SWI	bcodmo_name	String	depth_bsf
attribute	Depth_Below_SWI	colorBarMaximum	double	8000.0
attribute	Depth_Below_SWI	colorBarMinimum	double	-8000.0
attribute	Depth_Below_SWI	colorBarPalette	String	TopographyDepth
attribute	Depth_Below_SWI	description	String	Sampling depth below the sediment-water interface (SWI)
attribute	Depth_Below_SWI	long_name	String	Depth
attribute	Depth_Below_SWI	standard_name	String	depth
attribute	Depth_Below_SWI	units	String	centimeters (cm)
variable	time		double
attribute	time	_CoordinateAxisType	String	Time
attribute	time	actual_range	double	1.4815692E9, 1.48260228E9
attribute	time	axis	String	T
attribute	time	bcodmo_name	String	ISO_DateTime_UTC
attribute	time	description	String	Sampling date and time (GMT); format: yyyy-mm-ddTHH:MM
attribute	time	ioos_category	String	Time
attribute	time	long_name	String	Date Time
attribute	time	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/
attribute	time	source_name	String	Date_Time
attribute	time	standard_name	String	time
attribute	time	time_origin	String	01-JAN-1970 00:00:00
attribute	time	time_precision	String	1970-01-01T00:00Z
attribute	time	units	String	seconds since 1970-01-01T00:00:00Z
variable	latitude		double
attribute	latitude	_CoordinateAxisType	String	Lat
attribute	latitude	_FillValue	double	NaN
attribute	latitude	actual_range	double	27.00729, 27.50622
attribute	latitude	axis	String	Y
attribute	latitude	bcodmo_name	String	latitude
attribute	latitude	colorBarMaximum	double	90.0
attribute	latitude	colorBarMinimum	double	-90.0
attribute	latitude	description	String	Sampling latitude
attribute	latitude	ioos_category	String	Location
attribute	latitude	long_name	String	Latitude
attribute	latitude	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P09/current/LATX/
attribute	latitude	standard_name	String	latitude
attribute	latitude	units	String	degrees_north
variable	longitude		double
attribute	longitude	_CoordinateAxisType	String	Lon
attribute	longitude	_FillValue	double	NaN
attribute	longitude	actual_range	double	-111.68317, -111.38469
attribute	longitude	axis	String	X
attribute	longitude	bcodmo_name	String	longitude
attribute	longitude	colorBarMaximum	double	180.0
attribute	longitude	colorBarMinimum	double	-180.0
attribute	longitude	description	String	Sampling longitude
attribute	longitude	ioos_category	String	Location
attribute	longitude	long_name	String	Longitude
attribute	longitude	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P09/current/LONX/
attribute	longitude	standard_name	String	longitude
attribute	longitude	units	String	degrees_east
variable	Filter_Mass		float
attribute	Filter_Mass	_FillValue	float	NaN
attribute	Filter_Mass	actual_range	float	0.067, 4.861
attribute	Filter_Mass	bcodmo_name	String	mass
attribute	Filter_Mass	description	String	Mass of dry sediments on filter
attribute	Filter_Mass	long_name	String	Filter Mass
attribute	Filter_Mass	units	String	grams (g)
variable	Ra224_Activity		float
attribute	Ra224_Activity	_FillValue	float	NaN
attribute	Ra224_Activity	actual_range	float	0.141, 175.844
attribute	Ra224_Activity	bcodmo_name	String	radioactive_isotope_conc
attribute	Ra224_Activity	description	String	Measured activity of Ra-224
attribute	Ra224_Activity	long_name	String	Ra224 Activity
attribute	Ra224_Activity	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P02/current/WRAD/
attribute	Ra224_Activity	units	String	dpm/g
variable	Ra224_Unc		float
attribute	Ra224_Unc	_FillValue	float	NaN
attribute	Ra224_Unc	actual_range	float	0.022, 4.653
attribute	Ra224_Unc	bcodmo_name	String	radioactive_isotope_conc
attribute	Ra224_Unc	description	String	1-s analytical uncertainty in measured activity of Ra-224
attribute	Ra224_Unc	long_name	String	Ra224 Unc
attribute	Ra224_Unc	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P02/current/WRAD/
attribute	Ra224_Unc	units	String	dpm/g
variable	Th228_Activity		float
attribute	Th228_Activity	_FillValue	float	NaN
attribute	Th228_Activity	actual_range	float	0.156, 328.275
attribute	Th228_Activity	bcodmo_name	String	radioactive_isotope_conc
attribute	Th228_Activity	description	String	Measured activity of Th-228
attribute	Th228_Activity	long_name	String	Th228 Activity
attribute	Th228_Activity	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P02/current/WRAD/
attribute	Th228_Activity	units	String	dpm/g
variable	Th228_Unc		float
attribute	Th228_Unc	_FillValue	float	NaN
attribute	Th228_Unc	actual_range	float	0.022, 6.694
attribute	Th228_Unc	bcodmo_name	String	radioactive_isotope_conc
attribute	Th228_Unc	description	String	1-s analytical uncertainty in measured activity of Th-228
attribute	Th228_Unc	long_name	String	Th228 Unc
attribute	Th228_Unc	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P02/current/WRAD/
attribute	Th228_Unc	units	String	dpm/g

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.