ERDDAP > info > bcodmo_dataset_811368

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
		data	graph		files	public	C and N stable isotopes and elemental ratios of high and low molecular weight (HMW, LMW) DOM collected from the North Pacific Subtropical Gyre and Central North Atlantic determined by elemental analyzer isotope ratio mass spectrometry (EA-IRMS)		I   M	background			BCO-DMO	bcodmo_dataset_811368

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
attribute	NC_GLOBAL	acquisition_description	String	Sample Collection Samples were collected on two separate research cruises aboard the R/V Kilo Moana in August 2014 and May 2015. Sampling was conducted at the Hawaii Ocean Time Series Station ALOHA (A Long-Term Oligotrophic Habitat Assessment; 22\u00b0 45'N, 158\u00b0 00'W) and the Bermuda Atlantic Time Series Site (BATS; 31\u00b0 40'N, 64\u00b0 10'W) in the Central North Atlantic. Surface water was sampled via the vessel's underway sampling system. The intake pipe is situated on the forward starboard hull section of the vessel approximately 7.5 m below the waterline. The laboratory seawater tap was allowed to flush for 2 hours prior to each sampling. Seawater was pre-filtered through 53 \u00b5m Nitex mesh, and pumped through a 0.2 \u00b5m polyethersulfone (PES) cartridge filter (Shelco Filters, Micro Vantage, water grade, 9.75\" DOE, polycarbonate housing) prior to introduction to the ultrafiltration system. Large volume subsurface water samples were collected using successive casts of a rosette equipped with 24 x 12 L Niskin bottles. Tangential-Flow Ultrafiltration The main UF system was constructed using a modified design of the system described in Roland et al. (2009), and expanded on by Walker et al. (2011). Briefly, the system was comprised of four-spiral wound PES UF membranes, having a nominal molecular weight cut off of 2.5 kD (GE Osmonics GH2540F30, 40-inch long, 2.5-inch diameter). The membranes were mounted in stainless steel housings, plumbed in parallel to a 100 L fluorinated HDPE reservoir, with flow driven by a 1.5 HP stainless steel centrifugal pump (Goulds Pumps, Stainless steel centrifugal pump, NPE series 1 x 1-1/4 -6, close coupled to a 1-1/2 horsepower, 3500 RPM, 60 Hz, 3 phase, Open Drip Proof Motor; 5.75 Inch Impeller Diameter, Standard Viton Mechanical Seals). All other system plumbing components contacting seawater were composed of polytetrafluoroethylene (PTFE) or stainless steel. The system was run continuously at a membrane pressure of 40-50 psi, resulting in permeation flow rates of 1-2 L/min, depending primarily on the temperature of the feed seawater. Sample water was fed into the system using peristaltic pumps and platinum cured silicone tubing at a flow rate matched to the system permeation rates to ensure a constant system volume of approximately 100 L. Seawater samples of 3000-4000 L were concentrated to a final retentate volume of 15-20 L, drained from the system into acid washed PC carboys and refrigerated (less than 12 hours at 2C) until the next phase of processing. Samples requiring storage for longer than 12 hours were frozen and stored at -20\u00b0C. The UF system was then reconfigured to a smaller volume system, consisting of a single membrane having a smaller nominal molecular weight cutoff (GE Osmonics GE2540F30, 40-inch long, 2.5-inch diameter, 1 kD MWCO), and a 2.5 L PES reservoir for further volume reduction and subsequent salt removal (diafiltration). Using this smaller system, samples were reduced to 2-3 L under lower pressure (25 psi, permeation rate = 250 mL/min). Samples were then diafiltered using 40 L of 18.2 M\u03a9 Milli-Q (ultrapure) water, adding water to the sample retentate reservoir at the same rate of membrane permeation. Reduced and diafiltered samples were stored in acid washed PC bottles at -20\u00b0C for transport. In the laboratory, samples were further concentrated by rotary evaporation using pre-combusted glassware (450 \u00b0C, 5 h). A molecular sieve and a liquid nitrogen trap were placed between the vacuum pump and rotovap chamber to ensure no contamination of isolated material by back streaming of hydrocarbons or other contaminants. After reduction to 50-100 mL, samples were dried to powder via centrifugal evaporation in PTFE centrifuge tubes. Dry material was homogenized with an ethanol cleaned agate mortar and pestle, transferred to pre-combusted glass vials, and stored in a desiccation cabinet until subsequent analyses. Solid Phase Extraction Solid phase extraction was conducted using PPL sorbent (Agilent Bondesil PPL, 125 \u00b5m particle size, part # 5982-0026) following the general recommendations of Dittmar et al. (2008) and Green et al. (2014), including loading rates, seawater to sorbent ratios, and elution volumes and rates. Between 300 and 500 g of sorbent was used for each extraction, depending on sample volume and DOC concentration, with average loading of 4.2 \u00b1 1.5 L UF permeate per g sorbent representing 1.9 \u00b1 0.6 mg DOC per g sorbent or a DOC to sorbent mass ratio of 1:600 \u00b1 200. This is in line with both the recommendations of Dittmar et al. (2008) (maximum loading = 10 L seawater per g sorbent) and Li et al. (2016) (DOC to sorbent ratio = 1:800). Permeate from the UF system was fed through PTFE tubing to a pair of 200 L HDPE barrels. The permeate water was then acidified in 200 L batches to pH 2 by adding 400 mL of 6 M HCl (Fisher Chemical, ACS Plus grade). Batch samples were mixed continuously during collection, acidification, and loading using a peristaltic pump and platinum cured Si and PTFE tubing positioned at the surface and bottom of each barrel. Acidified batches of seawater permeate were then pumped through the SPE sorbent. SPE flow rates were matched to UF permeation rates (1-2 L/min), such that a pair of 200 L barrels allowed one barrel to be filled while the contents of the other was passed through the sorbent. Three custom SPE column configurations were used to contain the sorbent material. The column configuration was modified several times for ease of use on subsequent cruises. First, an open, gravity fed, large (49 mm ID x 1000 mm length, 1875 mL volume) glass chromatography column with 40 \u00b5m fritted disk and PTFE stopcock (Kimble-Chase, Kontes) was used. Next, we tested a custom built high-pressure SS housing (10 cm ID x 3.5 cm bed height), and finally a parallel combination of 2 medium-pressure glass chromatography columns (Kimble-Chase, Kontes, Chromaflex LC, 4.8 mm ID x 30 cm, 543 mL volume). While all designs proved to be functionally equivalent, the latter parallel combination of 2 medium-pressure glass columns ultimately provided the best configuration in order to maximize flow rates while simultaneously optimizing the ratio of sorbent bed height to loading speed. Further, the commercial availability and ease of use associated with this configuration made it our preferred design. Following sample loading, the SPE sorbent was desalted with 6 L of pH 2 ultrapure water at a low flow rate (250-300 mL/min). After desalting, the SPE sorbent was transferred to a glass chromatography column (75 mm ID x 300 mm length, 40 \u00b5m fritted disk, PTFE stopcock) with ultrapure water rinses to ensure quantitative transfer. Isolated organic material was then eluted from the sorbent with five to six 500 mL additions of methanol. The eluted methanol solution was stored in pre-combusted amber glass bottles at -20\u00b0C for transport. Similar to UF samples, the methanol-eluted solutions were first reduced by rotary evaporation to 50-100 mL. Samples were then dried to powder via centrifugal evaporation in PTFE centrifuge tubes. Dry material was homogenized with an ethanol cleaned agate mortar and pestle, transferred to pre-combusted glass vials, and stored in a desiccation cabinet until elemental and isotopic analyses. Elemental and Isotopic Analyses Natural abundance radiocarbon (\u039414C) determinations of all isolated fractions were performed at the Lawrence Livermore National Laboratory, Center for Accelerator Mass Spectrometry (LLNL-CAMS) by AMS following standard graphitization procedures (Santos et al., 2007; Vogel et al., 1984). The \u039414C signature of total seawater DOC (< 0.2 \u00b5m) was determined by UV-oxidation and AMS at the UC Irvine Keck Carbon Cycle AMS Lab (Beaupr\u00e9 et al., 2007; Druffel et al., 2013; Walker et al., 2016). Results are reported as age-corrected \u039414C (\u2030) for geochemical samples and have been corrected to the date of collection and are reported in accordance with conventions set forth by Stuiver and Polach (1977). Isotopic 14C results are reported as background and 13C corrected fraction modern (Fm), \u039414C, and conventional radiocarbon age (ybp). Stable carbon (\u03b413C) and nitrogen (\u03b415N) isotope ratios were determined via elemental analyzer isotope ratio mass spectrometry (EA-IRMS) at the University of California, Santa Cruz, Stable Isotope Laboratory (UCSC-SIL; [http://emerald.ucsc.edu/~silab/](\\"http://emerald.ucsc.edu/~silab/\\")). Approximately 1 mg of each dry isolated DOM sample was weighed into tin capsules (Costec, 5 x 9 mm) for analysis. EA-IRMS analysis was conducted using a Carlo Erba CHNS-O EA1108-elemental analyzer interfaced via a ConFlo III device with a ThermoFinnigan Delta Plus XP isotope ratio mass spectrometer (Thermo Fisher Scientific).\u00a0 Standards, EA-IRMS protocols, and correction routines followed standard UCSC-SIL protocols. Analytical uncertainties of n=3 replicate measurements of isotopic standards ranged from \u00b1 0.05 to 0.1\u2030 for both \u03b413C and \u03b415N. Carbon to nitrogen elemental ratios were similarly determined by elemental analysis. The presented ratios are atomic ratios (C/N)a normalized to the mass of C and N, but have been abbreviated as C/N throughout.
attribute	NC_GLOBAL	awards_0_award_nid	String	701743
attribute	NC_GLOBAL	awards_0_award_number	String	OCE-1358041
attribute	NC_GLOBAL	awards_0_data_url	String	http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1358041
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	Stable Isotopes and Elemental Ratios PI: Matthew McCarthy (UC Santa Cruz) Co-PI: Thomas Guilderson (UC Santa Cruz) Version date: 13 May 2020
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	dataset_current_state	String	Final and no updates
attribute	NC_GLOBAL	date_created	String	2020-05-13T16:58:31Z
attribute	NC_GLOBAL	date_modified	String	2020-05-20T15:36:18Z
attribute	NC_GLOBAL	defaultDataQuery	String	&amp;time&lt;now
attribute	NC_GLOBAL	doi	String	10.26008/1912/bco-dmo.811368.1
attribute	NC_GLOBAL	geospatial_vertical_max	double	2500.0
attribute	NC_GLOBAL	geospatial_vertical_min	double	2.0
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/811368
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	811379
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_0_supplied_name	String	rosette equipped with 24 x 12 L Niskin bottles
attribute	NC_GLOBAL	instruments_1_acronym	String	IR Mass Spec
attribute	NC_GLOBAL	instruments_1_dataset_instrument_nid	String	811399
attribute	NC_GLOBAL	instruments_1_description	String	The Isotope-ratio Mass Spectrometer is a particular type of mass spectrometer used to measure the relative abundance of isotopes in a given sample (e.g. VG Prism II Isotope Ratio Mass-Spectrometer).
attribute	NC_GLOBAL	instruments_1_instrument_external_identifier	String	https://vocab.nerc.ac.uk/collection/L05/current/LAB16/
attribute	NC_GLOBAL	instruments_1_instrument_name	String	Isotope-ratio Mass Spectrometer
attribute	NC_GLOBAL	instruments_1_instrument_nid	String	469
attribute	NC_GLOBAL	instruments_1_supplied_name	String	ThermoFinnigan Delta Plus XP isotope ratio mass spectrometer (Thermo Fisher Scientific)
attribute	NC_GLOBAL	instruments_2_acronym	String	Pump-Ship Intake
attribute	NC_GLOBAL	instruments_2_dataset_instrument_nid	String	811378
attribute	NC_GLOBAL	instruments_2_description	String	The 'Pump-underway ship intake' system indicates that samples are from the ship's clean water intake pump. This is essentially a surface water sample from a source of uncontaminated near-surface (commonly 3 to 7 m) seawater that can be pumped continuously to shipboard laboratories on research vessels. There is typically a temperature sensor near the intake (known as the hull temperature) to provide measurements that are as close as possible to the ambient water temperature. The flow from the supply is typically directed through continuously logged sensors such as a thermosalinograph and a fluorometer. Water samples are often collected from the underway supply that may also be referred to as the non-toxic supply. Ideally the data contributor has specified the depth in the ship's hull at which the pump is mounted.
attribute	NC_GLOBAL	instruments_2_instrument_external_identifier	String	https://vocab.nerc.ac.uk/collection/L05/current/31/
attribute	NC_GLOBAL	instruments_2_instrument_name	String	Pump - Surface Underway Ship Intake
attribute	NC_GLOBAL	instruments_2_instrument_nid	String	534
attribute	NC_GLOBAL	instruments_2_supplied_name	String	underway sampling system
attribute	NC_GLOBAL	instruments_3_dataset_instrument_nid	String	811398
attribute	NC_GLOBAL	instruments_3_description	String	Instruments that quantify carbon, nitrogen and sometimes other elements by combusting the sample at very high temperature and assaying the resulting gaseous oxides. Usually used for samples including organic material.
attribute	NC_GLOBAL	instruments_3_instrument_external_identifier	String	https://vocab.nerc.ac.uk/collection/L05/current/LAB01/
attribute	NC_GLOBAL	instruments_3_instrument_name	String	Elemental Analyzer
attribute	NC_GLOBAL	instruments_3_instrument_nid	String	546339
attribute	NC_GLOBAL	instruments_3_supplied_name	String	Carlo Erba CHNS-O EA1108-elemental analyzer
attribute	NC_GLOBAL	keywords	String	bco, bco-dmo, biological, C_N_ratio, C_N_ratio_stdev, chemical, d13, d13C, d13C_stdev, d15, d15N, d15N_stdev, data, dataset, depth, deviation, dmo, erddap, management, oceanography, office, pcnt, preliminary, ratio, sample, sample_type, season, standard, standard deviation, stdev, type, wt_pcnt_C, wt_pcnt_C_stdev, wt_pcnt_N, wt_pcnt_N_stdev, year
attribute	NC_GLOBAL	license	String	https://www.bco-dmo.org/dataset/811368/license
attribute	NC_GLOBAL	metadata_source	String	https://www.bco-dmo.org/api/dataset/811368
attribute	NC_GLOBAL	param_mapping	String	{'811368': {'depth': 'flag - depth'}}
attribute	NC_GLOBAL	parameter_source	String	https://www.bco-dmo.org/mapserver/dataset/811368/parameters
attribute	NC_GLOBAL	people_0_affiliation	String	University of California-Santa Cruz
attribute	NC_GLOBAL	people_0_affiliation_acronym	String	UC Santa Cruz
attribute	NC_GLOBAL	people_0_person_name	String	Matthew D. McCarthy
attribute	NC_GLOBAL	people_0_person_nid	String	557245
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 California-Santa Cruz
attribute	NC_GLOBAL	people_1_affiliation_acronym	String	UC Santa Cruz
attribute	NC_GLOBAL	people_1_person_name	String	Thomas Guilderson
attribute	NC_GLOBAL	people_1_person_nid	String	51494
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	Shannon Rauch
attribute	NC_GLOBAL	people_2_person_nid	String	51498
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	DON Microbial Nitrogen Pump
attribute	NC_GLOBAL	projects_0_acronym	String	DON Microbial Nitrogen Pump
attribute	NC_GLOBAL	projects_0_description	String	Dissolved organic nitrogen is one of the most important - but perhaps least understood - components of the modern ocean nitrogen cycle. While dissolved organic nitrogen represents a main active reservoir of fixed and seemingly biologically-available nitrogen, at the same time most of ocean's dissolved organic nitrogen pool is also apparently unavailable for use by organisms. Recently, the idea of the "Microbial Carbon Pump" has emerged, providing a renewed focus on microbes as primary agents for the formation of biologically-available dissolved material. However, the role that microbes play in transformation of biologically-available dissolved organic nitrogen is still lacking. In order to fill gaps in this knowledge, researchers from the University of California Santa Cruz will apply a series of new analytical approaches to test the role of microbial source and transformation in formation of the ocean's biologically-available dissolved organic nitrogen pool. Results from this study will address one of the major unknowns of both chemical oceanography and the ocean nitrogen cycle. Broader Impacts: This proposal will provide oceanographers new tools to test ideas of microbial organic matter sequestration in a world where the oceans are rapidly changing. High school, undergraduate, graduate and post-doctoral education will be furthered through active participation in lab, field, and data synthesis activities.
attribute	NC_GLOBAL	projects_0_end_date	String	2017-03
attribute	NC_GLOBAL	projects_0_geolocation	String	North Pacific Subtropical Gyre (HOT station), North Atlantic Subtropical Gyre (BATS time series station), California Margin
attribute	NC_GLOBAL	projects_0_name	String	The Microbial Nitrogen Pump: Coupling 14C and Compound-specific Amino Acids to Understand the Role of Microbial Transformations in the Refractory Ocean DON Pool
attribute	NC_GLOBAL	projects_0_project_nid	String	701744
attribute	NC_GLOBAL	projects_0_start_date	String	2014-04
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	standard_name_vocabulary	String	CF Standard Name Table v55
attribute	NC_GLOBAL	summary	String	C and N stable isotopes and elemental ratios of high and low molecular weight (HMW, LMW) DOM collected from the North Pacific Subtropical Gyre and Central North Atlantic determined by elemental analyzer isotope ratio mass spectrometry (EA-IRMS). These data were published in Broek et al. (2019) and Broek et al. (2017).
attribute	NC_GLOBAL	title	String	C and N stable isotopes and elemental ratios of high and low molecular weight (HMW, LMW) DOM collected from the North Pacific Subtropical Gyre and Central North Atlantic determined by elemental analyzer isotope ratio mass spectrometry (EA-IRMS)
attribute	NC_GLOBAL	version	String	1
attribute	NC_GLOBAL	xml_source	String	osprey2erddap.update_xml() v1.5
variable	location		String
attribute	location	bcodmo_name	String	site
attribute	location	description	String	Sample collection location. HOT = Hawaii Ocean Time Series station ALOHA (22° 45'N, 158° 00'W) in North Pacific Subtropical Gyre (NPSG); BATS = Hawaii Ocean Time Series station ALOHA (22° 45'N, 158° 00'W) in North Pacific Subtropical Gyre (NPSG)
attribute	location	long_name	String	Location
attribute	location	units	String	unitless
variable	year		short
attribute	year	_FillValue	short	32767
attribute	year	actual_range	short	2014, 2016
attribute	year	bcodmo_name	String	year
attribute	year	description	String	Year of sample collection; format: 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	season		String
attribute	season	bcodmo_name	String	season
attribute	season	description	String	Season of sample collection
attribute	season	long_name	String	Season
attribute	season	units	String	unitless
variable	sample_type		String
attribute	sample_type	bcodmo_name	String	sample_type
attribute	sample_type	description	String	DOM Fraction
attribute	sample_type	long_name	String	Sample Type
attribute	sample_type	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	2.0, 2500.0
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	Sample depth
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	wt_pcnt_C		float
attribute	wt_pcnt_C	_FillValue	float	NaN
attribute	wt_pcnt_C	actual_range	float	5.4, 55.2
attribute	wt_pcnt_C	bcodmo_name	String	C
attribute	wt_pcnt_C	description	String	weight % carbon
attribute	wt_pcnt_C	long_name	String	WT PCNT C
attribute	wt_pcnt_C	units	String	unitless (percent)
variable	wt_pcnt_C_stdev		float
attribute	wt_pcnt_C_stdev	_FillValue	float	NaN
attribute	wt_pcnt_C_stdev	actual_range	float	0.1, 5.9
attribute	wt_pcnt_C_stdev	bcodmo_name	String	C
attribute	wt_pcnt_C_stdev	description	String	Standard deviation of wt_pcnt_C
attribute	wt_pcnt_C_stdev	long_name	String	Wt Pcnt C Stdev
attribute	wt_pcnt_C_stdev	units	String	unitless (percent)
variable	wt_pcnt_N		float
attribute	wt_pcnt_N	_FillValue	float	NaN
attribute	wt_pcnt_N	actual_range	float	0.4, 2.6
attribute	wt_pcnt_N	bcodmo_name	String	N
attribute	wt_pcnt_N	description	String	weight % nitrogen
attribute	wt_pcnt_N	long_name	String	WT PCNT N
attribute	wt_pcnt_N	units	String	unitless (percent)
variable	wt_pcnt_N_stdev		float
attribute	wt_pcnt_N_stdev	_FillValue	float	NaN
attribute	wt_pcnt_N_stdev	actual_range	float	0.0, 0.4
attribute	wt_pcnt_N_stdev	bcodmo_name	String	N
attribute	wt_pcnt_N_stdev	description	String	Standard deviation of wt_pcnt_N
attribute	wt_pcnt_N_stdev	long_name	String	Wt Pcnt N Stdev
attribute	wt_pcnt_N_stdev	units	String	unitless (percent)
variable	d15N		float
attribute	d15N	_FillValue	float	NaN
attribute	d15N	actual_range	float	2.7, 7.1
attribute	d15N	bcodmo_name	String	d15N
attribute	d15N	description	String	15N/14N isotopic ratio
attribute	d15N	long_name	String	D15 N
attribute	d15N	units	String	permil (‰)
variable	d15N_stdev		float
attribute	d15N_stdev	_FillValue	float	NaN
attribute	d15N_stdev	actual_range	float	0.0, 0.6
attribute	d15N_stdev	bcodmo_name	String	d15N
attribute	d15N_stdev	description	String	Standard deviation of d15N
attribute	d15N_stdev	long_name	String	D15 N Stdev
attribute	d15N_stdev	units	String	permil (‰)
variable	d13C		float
attribute	d13C	_FillValue	float	NaN
attribute	d13C	actual_range	float	-23.1, -21.1
attribute	d13C	bcodmo_name	String	d13C
attribute	d13C	description	String	13C/12C isotopic ratio
attribute	d13C	long_name	String	D13 C
attribute	d13C	units	String	permil (‰)
variable	d13C_stdev		float
attribute	d13C_stdev	_FillValue	float	NaN
attribute	d13C_stdev	actual_range	float	0.0, 0.4
attribute	d13C_stdev	bcodmo_name	String	d13C
attribute	d13C_stdev	description	String	Standard deviation of d13C
attribute	d13C_stdev	long_name	String	D13 C Stdev
attribute	d13C_stdev	units	String	permil (‰)
variable	C_N_ratio		float
attribute	C_N_ratio	_FillValue	float	NaN
attribute	C_N_ratio	actual_range	float	11.5, 29.3
attribute	C_N_ratio	bcodmo_name	String	C_to_N
attribute	C_N_ratio	description	String	Atomic C to N ratio normalized to the mass of C and N
attribute	C_N_ratio	long_name	String	C N Ratio
attribute	C_N_ratio	units	String	unitless
variable	C_N_ratio_stdev		float
attribute	C_N_ratio_stdev	_FillValue	float	NaN
attribute	C_N_ratio_stdev	actual_range	float	0.0, 1.9
attribute	C_N_ratio_stdev	bcodmo_name	String	C_to_N
attribute	C_N_ratio_stdev	description	String	Standard deviation of C_N_ratio
attribute	C_N_ratio_stdev	long_name	String	C N Ratio Stdev
attribute	C_N_ratio_stdev	units	String	unitless

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.