ERDDAP > info > bcodmo_dataset_765859

Grid DAP Data	Sub- set	Table DAP Data	Make A Graph	W M S	Source Data Files	Acces- sible	Title	Sum- mary	ISO, Metadata	Back- ground Info	RSS	E mail	Institution	Dataset ID
	set	data	graph		files	public	Water column Th-234 activities from 4-liter water samples at the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean during RRS Discovery cruise DY077 in April of 2017		I   M	background			BCO-DMO	bcodmo_dataset_765859

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 were collected during two deployment cycles (termed \u201cdeployment 1\u201d and \u201cdeployment 2\u201d) occupied during the RRS Discovery cruise DY077 to the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) Site in April 2017. In each of the cycles, we conducted particle flux sampling method intercomparisons between fluxes derived from upper water column deficits of 234Th vs. its parent isotope 238U, two types of neutrally buoyant sediment traps (NBST and PELAGRA), and a surface tethered array of sediment traps (STT). 234Th profiles were sampled at the beginning and end of each deployment, triangulated 10 km apart around the drifting trap location (Figure 1). A total of 161 234Th samples were collected (Table 1). A 4-L sample was collected from CTD casts, a stable Th yield monitor was added and the pH was adjusted to promote the formation of a Mn precipitate that scavenges Th. This was then filtered onto a 25-mm diameter quartz filter (Buesseler et al., 2009). The quartz filter was dried and mounted, then beta counted on board and again 6 months post-cruise to determine the amount of interfering beta activity and detector background that was not associated with 234Th in the sample. Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean (49\u00b0N, 16.5\u00b0W)
attribute	NC_GLOBAL	awards_0_award_nid	String	762021
attribute	NC_GLOBAL	awards_0_award_number	String	OCE-1659995
attribute	NC_GLOBAL	awards_0_data_url	String	http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1659995
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	Dr Simone Metz
attribute	NC_GLOBAL	awards_0_program_manager_nid	String	51479
attribute	NC_GLOBAL	awards_1_award_nid	String	762029
attribute	NC_GLOBAL	awards_1_award_number	String	OCE-1660012
attribute	NC_GLOBAL	awards_1_data_url	String	http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1660012
attribute	NC_GLOBAL	awards_1_funder_name	String	NSF Division of Ocean Sciences
attribute	NC_GLOBAL	awards_1_funding_acronym	String	NSF OCE
attribute	NC_GLOBAL	awards_1_funding_source_nid	String	355
attribute	NC_GLOBAL	awards_1_program_manager	String	Dr Simone Metz
attribute	NC_GLOBAL	awards_1_program_manager_nid	String	51479
attribute	NC_GLOBAL	cdm_data_type	String	Other
attribute	NC_GLOBAL	comment	String	Water column Th-234 activities PI: Kenneth Buesseler Data version 1: 2019-05-02
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	2019-04-29T16:38:17Z
attribute	NC_GLOBAL	date_modified	String	2019-06-26T19:33:36Z
attribute	NC_GLOBAL	defaultDataQuery	String	&time<now
attribute	NC_GLOBAL	doi	String	10.1575/1912/bco-dmo.765859.1
attribute	NC_GLOBAL	Easternmost_Easting	double	-16.2624
attribute	NC_GLOBAL	geospatial_lat_max	double	49.2009
attribute	NC_GLOBAL	geospatial_lat_min	double	48.7487
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	double	-16.2624
attribute	NC_GLOBAL	geospatial_lon_min	double	-16.78
attribute	NC_GLOBAL	geospatial_lon_units	String	degrees_east
attribute	NC_GLOBAL	geospatial_vertical_max	double	415.0
attribute	NC_GLOBAL	geospatial_vertical_min	double	5.0
attribute	NC_GLOBAL	geospatial_vertical_positive	String	down
attribute	NC_GLOBAL	geospatial_vertical_units	String	m
attribute	NC_GLOBAL	infoUrl	String	https://www.bco-dmo.org/dataset/765859
attribute	NC_GLOBAL	institution	String	BCO-DMO
attribute	NC_GLOBAL	instruments_0_acronym	String	Niskin bottle
attribute	NC_GLOBAL	instruments_0_dataset_instrument_nid	String	766183
attribute	NC_GLOBAL	instruments_0_description	String	A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24 or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc.
attribute	NC_GLOBAL	instruments_0_instrument_external_identifier	String	https://vocab.nerc.ac.uk/collection/L22/current/TOOL0412/
attribute	NC_GLOBAL	instruments_0_instrument_name	String	Niskin bottle
attribute	NC_GLOBAL	instruments_0_instrument_nid	String	413
attribute	NC_GLOBAL	instruments_1_acronym	String	CTD
attribute	NC_GLOBAL	instruments_1_dataset_instrument_nid	String	766182
attribute	NC_GLOBAL	instruments_1_description	String	The Conductivity, Temperature, Depth (CTD) unit is an integrated instrument package designed to measure the conductivity, temperature, and pressure (depth) of the water column. The instrument is lowered via cable through the water column and permits scientists observe the physical properties in real time via a conducting cable connecting the CTD to a deck unit and computer on the ship. The CTD is often configured with additional optional sensors including fluorometers, transmissometers and/or radiometers. It is often combined with a Rosette of water sampling bottles (e.g. Niskin, GO-FLO) for collecting discrete water samples during the cast. This instrument designation is used when specific make and model are not known.
attribute	NC_GLOBAL	instruments_1_instrument_external_identifier	String	https://vocab.nerc.ac.uk/collection/L05/current/130/
attribute	NC_GLOBAL	instruments_1_instrument_name	String	CTD profiler
attribute	NC_GLOBAL	instruments_1_instrument_nid	String	417
attribute	NC_GLOBAL	instruments_1_supplied_name	String	CTD Seabird 911plus
attribute	NC_GLOBAL	instruments_2_acronym	String	Riso Beta Counter
attribute	NC_GLOBAL	instruments_2_dataset_instrument_nid	String	766184
attribute	NC_GLOBAL	instruments_2_description	String	Low-level beta detectors manufactured by Riso (now Nutech) in Denmark. These instruments accept samples that can be mounted on a 25mm filter holder. These detectors have very low backgrounds, 0.17 counts per minute, and can have counting efficiencies as high as 55%. See: http://cafethorium.whoi.edu/website/about/services_radioanalytical_facility_equip.html and http://www.nutech.dtu.dk/Produkter/Dosimetri/NUK_instruments/GM_multicounter.aspx
attribute	NC_GLOBAL	instruments_2_instrument_name	String	Riso Laboratory Anti-coincidence Beta Counters
attribute	NC_GLOBAL	instruments_2_instrument_nid	String	687
attribute	NC_GLOBAL	instruments_2_supplied_name	String	Riso Beta Counter
attribute	NC_GLOBAL	keywords	String	bco, bco-dmo, biological, bottle, cast, chemical, data, dataset, date, deployment, depth, dmo, erddap, error, iso, latitude, longitude, management, oceanography, office, preliminary, station, th234, Th234_tot, Th234_tot_err, time, time2, tot, u238, U238_tot, U238_tot_err
attribute	NC_GLOBAL	license	String	https://www.bco-dmo.org/dataset/765859/license
attribute	NC_GLOBAL	metadata_source	String	https://www.bco-dmo.org/api/dataset/765859
attribute	NC_GLOBAL	Northernmost_Northing	double	49.2009
attribute	NC_GLOBAL	param_mapping	String	{'765859': {'lat': 'master - latitude', 'depth': 'master - depth', 'lon': 'master - longitude', 'ISO_DateTime_UTC': 'master - time'}}
attribute	NC_GLOBAL	parameter_source	String	https://www.bco-dmo.org/mapserver/dataset/765859/parameters
attribute	NC_GLOBAL	people_0_affiliation	String	Woods Hole Oceanographic Institution
attribute	NC_GLOBAL	people_0_affiliation_acronym	String	WHOI
attribute	NC_GLOBAL	people_0_person_name	String	Kenneth O. Buesseler
attribute	NC_GLOBAL	people_0_person_nid	String	50522
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	Skidmore College
attribute	NC_GLOBAL	people_1_person_name	String	Margaret L. Estapa
attribute	NC_GLOBAL	people_1_person_nid	String	644830
attribute	NC_GLOBAL	people_1_role	String	Co-Principal Investigator
attribute	NC_GLOBAL	people_1_role_type	String	originator
attribute	NC_GLOBAL	people_2_affiliation	String	Woods Hole Oceanographic Institution
attribute	NC_GLOBAL	people_2_affiliation_acronym	String	WHOI BCO-DMO
attribute	NC_GLOBAL	people_2_person_name	String	Amber York
attribute	NC_GLOBAL	people_2_person_nid	String	643627
attribute	NC_GLOBAL	people_2_role	String	BCO-DMO Data Manager
attribute	NC_GLOBAL	people_2_role_type	String	related
attribute	NC_GLOBAL	project	String	Are Traps Equal
attribute	NC_GLOBAL	projects_0_acronym	String	Are Traps Equal
attribute	NC_GLOBAL	projects_0_description	String	NSF Award Abstract: There is considerable need to understand the biological and ecological processes that through net primary production fix dissolved carbon dioxide (CO2) into organic matter in the upper ocean, and the processes that subsequently transport this organic carbon in to the ocean's interior. Most of the particulate organic carbon flux to the deep ocean is thought to be mediated by sinking particles. Ultimately it is the deep organic carbon transport and its sequestration that define the impact of ocean biota on atmospheric CO2 levels and hence climate. Currently, various methods are available to measure the amount of particles in the ocean that sink over a specified period of time commonly referred to as particle flux. Unfortunately, all of these methods are used independently of each other with very little intercomparison, leaving some uncertainty as to which approach provides the most accurate estimates. This study seeks to be the first concerted effort to standardize particle flux measurements. Seeking to keep the cost modest, the researchers are taking advantage of a collaboration with scientists in the United Kingdom to participate in an already scheduled research cruise. The proposed research will have much greater impact that merely standardization of particle flux measurements because it will provide the science and modeling community the ability to quantify the transfer of carbon throughout the surface ocean. Also, this project provides a variety of mentoring and training opportunities for students. A PhD student at Woods Hole Oceanographic Institute will get their first sea-going experience and will learn all of the processing steps for the study of an isotope of thorium (234Th). Skidmore College will have an undergraduate participant in the research and the results from the cruise will also be an excellent additional component for undergraduate oceanography classes. Researchers from Woods Hole Oceanographic Institution and Skidmore College, in collaboration with a scientist from the National Oceanography Centre, Southampton will inter-compare direct, tracer, and optical-sensor methods used to determine sinking particle fluxes in the surface ocean. To do this, they will firstly conduct a comparison of two types of neutrally buoyant traps and one surface-tethered, drifting array. Secondly, measured trap fluxes will be compared to predicted 234Th fluxes from a 3D time-series of data. Lastly, optical sediment trap measurements will be compared to particle size distributions in the water column and gel traps, as well as size-fractionated particles on filters from large volume pumps. With this research, global ocean models, particularly carbon, will have greater accuracy and stronger conclusions will be able to be drawn from them.
attribute	NC_GLOBAL	projects_0_end_date	String	2019-06
attribute	NC_GLOBAL	projects_0_geolocation	String	Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean (49°N, 16.5°W)
attribute	NC_GLOBAL	projects_0_name	String	Collaborative Research: Are all traps created equal? A multi-method assessment of the collection and detection of sinking particles in the ocean
attribute	NC_GLOBAL	projects_0_project_nid	String	762022
attribute	NC_GLOBAL	projects_0_start_date	String	2017-01
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	48.7487
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v55
attribute	NC_GLOBAL	subsetVariables	String	U238_tot_err
attribute	NC_GLOBAL	summary	String	Water column Th-234 activities from 4-liter water samples at the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean during RRS Discovery cruise DY077 in April of 2017.
attribute	NC_GLOBAL	time_coverage_end	String	2017-04-28T10:50Z
attribute	NC_GLOBAL	time_coverage_start	String	2017-04-19T09:00Z
attribute	NC_GLOBAL	title	String	Water column Th-234 activities from 4-liter water samples at the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean during RRS Discovery cruise DY077 in April of 2017
attribute	NC_GLOBAL	version	String	1
attribute	NC_GLOBAL	Westernmost_Easting	double	-16.78
attribute	NC_GLOBAL	xml_source	String	osprey2erddap.update_xml() v1.3
variable	deployment		String
attribute	deployment	bcodmo_name	String	deploy
attribute	deployment	description	String	deployment cycle during cruise DY077
attribute	deployment	long_name	String	Deployment
attribute	deployment	units	String	unitless
variable	station		byte
attribute	station	_FillValue	byte	127
attribute	station	actual_range	byte	31, 106
attribute	station	bcodmo_name	String	station
attribute	station	description	String	station occupied during cruise DY077
attribute	station	long_name	String	Station
attribute	station	units	String	unitless
variable	cast		byte
attribute	cast	_FillValue	byte	127
attribute	cast	actual_range	byte	4, 23
attribute	cast	bcodmo_name	String	platform
attribute	cast	description	String	CTD cast number
attribute	cast	long_name	String	Cast
attribute	cast	units	String	unitless
variable	bottle		byte
attribute	bottle	_FillValue	byte	127
attribute	bottle	actual_range	byte	1, 20
attribute	bottle	bcodmo_name	String	bottle
attribute	bottle	description	String	rosette bottle number
attribute	bottle	long_name	String	Bottle
attribute	bottle	units	String	unitless
variable	depth		double
attribute	depth	_CoordinateAxisType	String	Height
attribute	depth	_CoordinateZisPositive	String	down
attribute	depth	_FillValue	double	NaN
attribute	depth	actual_range	double	5.0, 415.0
attribute	depth	axis	String	Z
attribute	depth	bcodmo_name	String	depth
attribute	depth	colorBarMaximum	double	8000.0
attribute	depth	colorBarMinimum	double	-8000.0
attribute	depth	colorBarPalette	String	TopographyDepth
attribute	depth	description	String	depth of water sample collection
attribute	depth	ioos_category	String	Location
attribute	depth	long_name	String	Depth
attribute	depth	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P09/current/DEPH/
attribute	depth	positive	String	down
attribute	depth	standard_name	String	depth
attribute	depth	units	String	m
variable	latitude		double
attribute	latitude	_CoordinateAxisType	String	Lat
attribute	latitude	_FillValue	double	NaN
attribute	latitude	actual_range	double	48.7487, 49.2009
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	latitude of CTD cast
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	-16.78, -16.2624
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	longitude of CTD cast
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	date		String
attribute	date	bcodmo_name	String	date_utc
attribute	date	description	String	date of CTD cast (GMT) in ISO 8601 format yyyy-mm-dd
attribute	date	long_name	String	Date
attribute	date	time_precision	String	1970-01-01
attribute	date	units	String	unitless
variable	time2		String
attribute	time2	bcodmo_name	String	time_utc
attribute	time2	description	String	time of CTD cast (GMT) in ISO 8601 format hh:mm:ss
attribute	time2	long_name	String	Time
attribute	time2	units	String	unitless
variable	time		double
attribute	time	_CoordinateAxisType	String	Time
attribute	time	actual_range	double	1.4925924E9, 1.4933766E9
attribute	time	axis	String	T
attribute	time	bcodmo_name	String	ISO_DateTime_UTC
attribute	time	description	String	date time (UTC) in ISO 8601 format yyyy-mm-ddTHH:MMZ
attribute	time	ioos_category	String	Time
attribute	time	long_name	String	ISO Date Time UTC
attribute	time	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/
attribute	time	source_name	String	ISO_DateTime_UTC
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	U238_tot		float
attribute	U238_tot	_FillValue	float	NaN
attribute	U238_tot	actual_range	float	2.46, 2.48
attribute	U238_tot	bcodmo_name	String	U238
attribute	U238_tot	description	String	total uranium-238 activity calculated from CTD salinity as per Owens et al. 2011
attribute	U238_tot	long_name	String	U238 Tot
attribute	U238_tot	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P01/current/GAU238BD/
attribute	U238_tot	units	String	disintegration per minute per liter (dpm/L)
variable	U238_tot_err		float
attribute	U238_tot_err	_FillValue	float	NaN
attribute	U238_tot_err	actual_range	float	0.05, 0.05
attribute	U238_tot_err	bcodmo_name	String	U238
attribute	U238_tot_err	description	String	total uranium-238 uncertainty, derived from the uncertainty in the relationship in Owens et al. 2011
attribute	U238_tot_err	long_name	String	U238 Tot Err
attribute	U238_tot_err	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P01/current/GAU238BD/
attribute	U238_tot_err	units	String	disintegration per minute per liter (dpm/L)
variable	Th234_tot		float
attribute	Th234_tot	_FillValue	float	NaN
attribute	Th234_tot	actual_range	float	1.79, 2.82
attribute	Th234_tot	bcodmo_name	String	thorium-234
attribute	Th234_tot	description	String	total uranium-238 activity determined from 4-liter water samples
attribute	Th234_tot	long_name	String	Th234 Tot
attribute	Th234_tot	units	String	disintegration per minute per liter (dpm/L)
variable	Th234_tot_err		float
attribute	Th234_tot_err	_FillValue	float	NaN
attribute	Th234_tot_err	actual_range	float	0.03, 0.1
attribute	Th234_tot_err	bcodmo_name	String	thorium-234
attribute	Th234_tot_err	description	String	total uranium-238 uncertainty, derived from counting statistics and error propagation for mass/volume measurements and ICP-MS recovery analysis
attribute	Th234_tot_err	long_name	String	Th234 Tot Err
attribute	Th234_tot_err	units	String	disintegration per minute per liter (dpm/L)

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.