ERDDAP > info > bcodmo_dataset_660527

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	Sediment geochemical and microbial activity data collected on R/V Oden along the East Siberian Arctic Shelf from 2014 (ESAS Water Column Methane project)		I   M	background			BCO-DMO	bcodmo_dataset_660527

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
attribute	NC_GLOBAL	acquisition_description	String	Acquisition methods are described in the following publication: Orcutt, B.N. et al. 2005 Core sectioning, porewater\u00a0collection\u00a0and analysis At each sampling site, sediment sub-samples were collected for porewater analyses and at selected depths for microbial rate assays (AOM, anaerobic oxidation of methane oxidation; methanogenesis (MOG) from bicarbonate and acetate). Sediment was expelled from core liner using a hydraulic extruder under anoxic conditions. The depth intervals for extrusion varied. At each depth interval, a sub-sample was collected into a cut-off syringe for dissolved methane concentration quantification. Another 5 mL\u00a0sub- sample\u00a0was collected into pre-weighed and pre-combusted glass vial for determination of porosity (determined by the change in weight after drying at 80 degrees celsius to a constant weight). The remaining material was used for porewater extraction. Sample fixation and\u00a0analyses\u00a0for dissolved constituents followed the methods of Joye et al. (2010).\u00a0 Microbial Activity Measurements\u00a0 To determine AOM and MOG rates, 8 to 12 sub-samples (5 cm3) were collected from a core by manual insertion of a glass tube. For AOM, 100 uL of dissolved\u00a014CH4\u00a0tracer (about 2,000,000 DPM as gas) was injected into each core. Samples were incubated for 36 to 48 hours at\u00a0in situ\u00a0temperature.\u00a0 Following incubation, samples were transferred to 20 mL glass vials containing 2 mL of 2M NaOH (which served to arrest biological activity and fix\u00a014CO2\u00a0as\u00a014C-HCO3-).\u00a0 Each vial was sealed with a\u00a0teflon-lined screw cap, vortexed to mix the sample and base, and immediately frozen. Time zero samples were fixed immediately after radiotracer injection. The specific activity of the tracer substrate (14CH4) was determined by injecting 50 uL directly into scintillation cocktail (Scintiverse BD) followed by liquid scintillation counting. The accumulation of 14C product (14CO2) was determined by acid digestion following the method of Joye et al. (2010).\u00a0 The AOM rate was calculated using equation 1: AOM Rate = [CH4] x alphaCH4 /t x (a-14CO2/a-14CH4)\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0(Eq. 1) Here, the AOM Rate is expressed as nmol CH4 oxidized per cm3 sediment per day (nmol\u00a0cm-3 d-1), [CH4] is the methane concentration (uM), alphaCH4 is the isotope fractionation factor for AOM (1.06; (ALPERIN and REEBURGH, 1988)), t is the incubation time (d), a-14CO2 is the activity of the product pool, and a-14CH4 is the activity of the substrate pool. If methane concentration was not available, the turnover time of the 14CH4 tracer is presented. Rates of bicarbonate-based-methanogenesis and acetoclastic methanogenesis were determined by incubating samples in gas-tight, closed-tube vessels without headspace, to prevent the loss of gaseous 14CH4 product during sample manipulation. These sample tubes were sealed using custom-designed plungers (black Hungate stoppers with the lip removed containing a plastic \u201ctail\u201d that was run through the stopper) were inserted at the base of the tube; the sediment was then pushed via the plunger to the top of the tube until a small amount protruded through the tube opening. A butyl rubber septa\u00a0was\u00a0then eased into the tube opening to displace sediment in contact with the atmosphere and close the tube, which was then sealed with\u00a0a open-top\u00a0screw cap.\u00a0 The rubber materials used in these assays were boiled in 1N NaOH for 1 hour, followed by several rinses in boiling milliQ, to leach potentially toxic substances. \u00a0 \u00a0 A volume of radiotracer solution (100 uL of 14C-HCO3- tracer (~1 x 107\u00a0dpm\u00a0in slightly alkaline milliQ\u00a0water) or 1,2-14C-CH3COO- tracer (~5 x 107\u00a0dpm\u00a0in slightly alkaline milliQ\u00a0water)) was injected into each sample. Samples were incubated as described above and then 2 ml of 2N NaOH was injected through the top stopper into each sample to terminate biological activity (time zero samples were fixed prior to tracer injection).\u00a0 Samples were mixed to evenly distribute NaOH through the sample.\u00a0 Production of 14CH4 was quantified by stripping methane from the tubes with an air carrier, converting the 14CH4 to 14CO2 in a combustion furnace, and subsequent trapping of the 14CO2 in NaOH as carbonate (CRAGG et al., 1990; CRILL and MARTENS, 1986).\u00a0\u00a0Activity\u00a0of 14CO2 was measured subsequently by liquid scintillation counting.\u00a0 The rates of Bi-MOG and Ac-MOG rates were calculated using equations 2 and 3, respectively: Bi-MOG Rate = [HCO3-] x alphaHCO3/t x\u00a0 (a-14CH4/a-H14CO3-) \u00a0 \u00a0 (Eq. 2) Ac-MOG Rate = [CH3COO-] x alphaCH3COO-/t\u00a0 x\u00a0 (a-14CH4/a-14CH314COO-) \u00a0 \u00a0 (Eq. 3) Both rates are expressed as nmol HCO3- or CH3COO-, respectively, reduced cm-3 d-1, alphaHCO3\u00a0and alphaCH3COO- are the isotope fractionation factors for MOG (assumed to be 1.06). [HCO3-] and [CH3COO-] are the\u00a0pore\u00a0water bicarbonate (mM) and acetate (uM) concentrations, respectively, t is incubation time (d), a-14CH4 is the activity of the product pool, and a-H14CO3 and a-14CH314COO are the activities of the substrate pools. If samples for substrate concentration determination were not available, the substrate turnover constant instead of the rate is presented. For water column methane oxidation rate assays, triplicate 20 mL of live water (in addition to one 20 mL sample which was killed with ethanol (750 uL of pure EtOH) before tracer addition) were transferred from the CTD into serum vials. Samples were amended with 2 x 10^6 DPM of 3H-labeled-methane tracer and incubated for 24 to 72 hours (linearity of activity was tested and confirmed). After incubation, samples were fixed with ethanol, as above, and a sub-sample to determine total sample activity (3H-methane + 3H-water) was collected. Next, the sample was purged with nitrogen to remove the 3H-methane tracer and a sub-sample was amended with scintillation fluid and counted on a shipboard scintillation counter to determine the activity of tracer in the product of 3H-methane oxidation, 3H-water. The methane oxidation rate was calculated as: MOX Rate = [methane concentration in nM] x alphaCH4/t\u00a0 x\u00a0 (a-3H- H2O/a-3H-CH4-) \u00a0 \u00a0 (Eq. 3)
attribute	NC_GLOBAL	awards_0_award_nid	String	651766
attribute	NC_GLOBAL	awards_0_award_number	String	PLR-1023444
attribute	NC_GLOBAL	awards_0_data_url	String	http://www.nsf.gov/awardsearch/showAward?AWD_ID=1023444
attribute	NC_GLOBAL	awards_0_funder_name	String	NSF Division of Polar Programs
attribute	NC_GLOBAL	awards_0_funding_acronym	String	NSF PLR
attribute	NC_GLOBAL	awards_0_funding_source_nid	String	490497
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	Arctic Sediment Data S. Joye and V. Samarkin, PIs Version 4 October 2016
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	2016-10-04T21:16:40Z
attribute	NC_GLOBAL	date_modified	String	2019-04-22T21:24:55Z
attribute	NC_GLOBAL	defaultDataQuery	String	&time<now
attribute	NC_GLOBAL	doi	String	10.1575/1912/bco-dmo.660527.1
attribute	NC_GLOBAL	Easternmost_Easting	double	172.361
attribute	NC_GLOBAL	geospatial_lat_max	double	78.942
attribute	NC_GLOBAL	geospatial_lat_min	double	74.44
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	double	172.361
attribute	NC_GLOBAL	geospatial_lon_min	double	125.243
attribute	NC_GLOBAL	geospatial_lon_units	String	degrees_east
attribute	NC_GLOBAL	infoUrl	String	https://www.bco-dmo.org/dataset/660527
attribute	NC_GLOBAL	institution	String	BCO-DMO
attribute	NC_GLOBAL	instruments_0_acronym	String	CTD
attribute	NC_GLOBAL	instruments_0_dataset_instrument_description	String	Used to collect water column samples
attribute	NC_GLOBAL	instruments_0_dataset_instrument_nid	String	660538
attribute	NC_GLOBAL	instruments_0_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_0_instrument_external_identifier	String	https://vocab.nerc.ac.uk/collection/L05/current/130/
attribute	NC_GLOBAL	instruments_0_instrument_name	String	CTD profiler
attribute	NC_GLOBAL	instruments_0_instrument_nid	String	417
attribute	NC_GLOBAL	instruments_0_supplied_name	String	CTD
attribute	NC_GLOBAL	instruments_1_acronym	String	Multi Corer
attribute	NC_GLOBAL	instruments_1_dataset_instrument_description	String	Core used in sampling
attribute	NC_GLOBAL	instruments_1_dataset_instrument_nid	String	660536
attribute	NC_GLOBAL	instruments_1_description	String	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.
attribute	NC_GLOBAL	instruments_1_instrument_external_identifier	String	https://vocab.nerc.ac.uk/collection/L05/current/51/
attribute	NC_GLOBAL	instruments_1_instrument_name	String	Multi Corer
attribute	NC_GLOBAL	instruments_1_instrument_nid	String	532
attribute	NC_GLOBAL	instruments_1_supplied_name	String	Multiple core
attribute	NC_GLOBAL	instruments_2_acronym	String	LSC
attribute	NC_GLOBAL	instruments_2_dataset_instrument_description	String	Used to determine activity of tracer substrate
attribute	NC_GLOBAL	instruments_2_dataset_instrument_nid	String	660537
attribute	NC_GLOBAL	instruments_2_description	String	Liquid scintillation counting is an analytical technique which is defined by the incorporation of the radiolabeled analyte into uniform distribution with a liquid chemical medium capable of converting the kinetic energy of nuclear emissions into light energy. Although the liquid scintillation counter is a sophisticated laboratory counting system used the quantify the activity of particulate emitting (ß and a) radioactive samples, it can also detect the auger electrons emitted from 51Cr and 125I samples.
attribute	NC_GLOBAL	instruments_2_instrument_external_identifier	String	https://vocab.nerc.ac.uk/collection/L05/current/LAB21/
attribute	NC_GLOBAL	instruments_2_instrument_name	String	Liquid Scintillation Counter
attribute	NC_GLOBAL	instruments_2_instrument_nid	String	624
attribute	NC_GLOBAL	instruments_2_supplied_name	String	Liquid scintillation counter
attribute	NC_GLOBAL	keywords	String	aom, AOM_rate, bco, bco-dmo, biological, carbonate, ch3, ch4, chemical, co3, collection, collection_type, coo, data, dataset, depth, dmo, erddap, h14, latitude, longitude, management, mog, month, oceanography, office, preliminary, rate, sample, sample_ID, sed, sed_CH4, sediment, sediment_depth, srr, station, turnover, turnover_14_CH3COO_MOG, turnover_H14_CO3_MOG, turnover_SRR, type, year
attribute	NC_GLOBAL	license	String	https://www.bco-dmo.org/dataset/660527/license
attribute	NC_GLOBAL	metadata_source	String	https://www.bco-dmo.org/api/dataset/660527
attribute	NC_GLOBAL	Northernmost_Northing	double	78.942
attribute	NC_GLOBAL	param_mapping	String	{'660527': {'lat': 'master - latitude', 'sediment_depth': 'flag - depth', 'lon': 'master - longitude'}}
attribute	NC_GLOBAL	parameter_source	String	https://www.bco-dmo.org/mapserver/dataset/660527/parameters
attribute	NC_GLOBAL	people_0_affiliation	String	University of Georgia
attribute	NC_GLOBAL	people_0_affiliation_acronym	String	UGA
attribute	NC_GLOBAL	people_0_person_name	String	Samantha B. Joye
attribute	NC_GLOBAL	people_0_person_nid	String	51421
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	University of Georgia
attribute	NC_GLOBAL	people_1_affiliation_acronym	String	UGA
attribute	NC_GLOBAL	people_1_person_name	String	Vladimir Samarkin
attribute	NC_GLOBAL	people_1_person_nid	String	641543
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	University of Georgia
attribute	NC_GLOBAL	people_2_affiliation_acronym	String	UGA
attribute	NC_GLOBAL	people_2_person_name	String	Samantha B. Joye
attribute	NC_GLOBAL	people_2_person_nid	String	51421
attribute	NC_GLOBAL	people_2_role	String	Contact
attribute	NC_GLOBAL	people_2_role_type	String	related
attribute	NC_GLOBAL	people_3_affiliation	String	Woods Hole Oceanographic Institution
attribute	NC_GLOBAL	people_3_affiliation_acronym	String	WHOI BCO-DMO
attribute	NC_GLOBAL	people_3_person_name	String	Hannah Ake
attribute	NC_GLOBAL	people_3_person_nid	String	650173
attribute	NC_GLOBAL	people_3_role	String	BCO-DMO Data Manager
attribute	NC_GLOBAL	people_3_role_type	String	related
attribute	NC_GLOBAL	project	String	ESAS Water Column Methane
attribute	NC_GLOBAL	projects_0_acronym	String	ESAS Water Column Methane
attribute	NC_GLOBAL	projects_0_description	String	We propose to study methane (CH4) release over the East Siberian Arctic shelf (ESAS), the largest (~10% of the world ocean shelf area) and the shallowest shelf (mean depth
attribute	NC_GLOBAL	projects_0_end_date	String	2015-08
attribute	NC_GLOBAL	projects_0_geolocation	String	East Siberian Arctic Shelf
attribute	NC_GLOBAL	projects_0_name	String	The East Siberian Arctic Shelf as a Source of Atmospheric Methane: First Approach to Quantitative Assessment
attribute	NC_GLOBAL	projects_0_project_nid	String	651769
attribute	NC_GLOBAL	projects_0_start_date	String	2010-09
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	74.44
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v55
attribute	NC_GLOBAL	subsetVariables	String	year,month,collection_type
attribute	NC_GLOBAL	summary	String	Sediment geochemical and microbial activity data collected on R/V Oden along the East Siberian Arctic Shelf from 2014 (ESAS Water Column Methane project)
attribute	NC_GLOBAL	title	String	Sediment geochemical and microbial activity data collected on R/V Oden along the East Siberian Arctic Shelf from 2014 (ESAS Water Column Methane project)
attribute	NC_GLOBAL	version	String	1
attribute	NC_GLOBAL	Westernmost_Easting	double	125.243
attribute	NC_GLOBAL	xml_source	String	osprey2erddap.update_xml() v1.3
variable	year		short
attribute	year	_FillValue	short	32767
attribute	year	actual_range	short	2014, 2014
attribute	year	bcodmo_name	String	year
attribute	year	description	String	Year of sampling; YYYY
attribute	year	long_name	String	Year
attribute	year	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P01/current/YEARXXXX/
attribute	year	units	String	unitless
variable	month		byte
attribute	month	_FillValue	byte	127
attribute	month	actual_range	byte	7, 7
attribute	month	bcodmo_name	String	month
attribute	month	description	String	Month of sampling; mm
attribute	month	long_name	String	Month
attribute	month	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P01/current/MNTHXXXX/
attribute	month	units	String	unitless
variable	collection_type		String
attribute	collection_type	bcodmo_name	String	sampling_method
attribute	collection_type	description	String	Method used to collect samples
attribute	collection_type	long_name	String	Collection Type
attribute	collection_type	units	String	unitless
variable	station		byte
attribute	station	_FillValue	byte	127
attribute	station	actual_range	byte	1, 63
attribute	station	bcodmo_name	String	station
attribute	station	description	String	Station where sampling occurred
attribute	station	long_name	String	Station
attribute	station	units	String	unitless
variable	latitude		double
attribute	latitude	_CoordinateAxisType	String	Lat
attribute	latitude	_FillValue	double	NaN
attribute	latitude	actual_range	double	74.44, 78.942
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
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	125.243, 172.361
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
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	sample_ID		String
attribute	sample_ID	bcodmo_name	String	sample
attribute	sample_ID	description	String	PI issued sample ID number
attribute	sample_ID	long_name	String	Sample ID
attribute	sample_ID	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P02/current/ACYC/
attribute	sample_ID	units	String	unitless
variable	sediment_depth		double
attribute	sediment_depth	_FillValue	double	NaN
attribute	sediment_depth	actual_range	double	-5.0, 52.5
attribute	sediment_depth	bcodmo_name	String	depth_core
attribute	sediment_depth	description	String	Depth of sediment; negative depth values represent overlying water samples
attribute	sediment_depth	long_name	String	Sediment Depth
attribute	sediment_depth	units	String	centimeters
variable	sed_CH4		float
attribute	sed_CH4	_FillValue	float	NaN
attribute	sed_CH4	actual_range	float	0.0, 53.52
attribute	sed_CH4	bcodmo_name	String	unknown
attribute	sed_CH4	description	String	Methane concentration in sediment
attribute	sed_CH4	long_name	String	Sed CH4
attribute	sed_CH4	units	String	microns (uM)
variable	AOM_rate		float
attribute	AOM_rate	_FillValue	float	NaN
attribute	AOM_rate	actual_range	float	0.05, 247.62
attribute	AOM_rate	bcodmo_name	String	unknown
attribute	AOM_rate	description	String	Anaerobic Oxidation of Methane; CH4 oxidized in sediment per day; Rates were measured at stations 13 and 23 only.
attribute	AOM_rate	long_name	String	AOM Rate
attribute	AOM_rate	units	String	picomole per centimeter per day (pmol/cm/day)
variable	turnover_14_CH3COO_MOG		String
attribute	turnover_14_CH3COO_MOG	bcodmo_name	String	unknown
attribute	turnover_14_CH3COO_MOG	description	String	14-CH3COO methanogenesis turnover; Rates were measured at stations 13 and 23 only.
attribute	turnover_14_CH3COO_MOG	long_name	String	Turnover 14 CH3 COO MOG
attribute	turnover_14_CH3COO_MOG	units	String	percent
variable	turnover_H14_CO3_MOG		String
attribute	turnover_H14_CO3_MOG	bcodmo_name	String	unknown
attribute	turnover_H14_CO3_MOG	description	String	H14-CO3 methanogenesis turnover; Rates were measured at stations 13 and 23 only.
attribute	turnover_H14_CO3_MOG	long_name	String	Turnover H14 CO3 MOG
attribute	turnover_H14_CO3_MOG	units	String	percent
variable	turnover_SRR		float
attribute	turnover_SRR	_FillValue	float	NaN
attribute	turnover_SRR	actual_range	float	0.002, 0.127
attribute	turnover_SRR	bcodmo_name	String	unknown
attribute	turnover_SRR	description	String	Sulfate reduction methanogenesis turnover; Rates were measured at stations 13 and 23 only.
attribute	turnover_SRR	long_name	String	Turnover SRR
attribute	turnover_SRR	units	String	percent

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.