ERDDAP > info > bcodmo_dataset_788753

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	[Hg Isotopes Particles] - Mercury stable isotope values for marine particles from R/V Kilo Moana cruises KM1418, KM1407 and KM1506 around station ALOHA in 2014 and 2015 (Collaborative Research: Isotopic insights to mercury in marine food webs and how it varies with ocean biogeochemistry)		I   M	background			BCO-DMO	bcodmo_dataset_788753

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	Small (1-53 \u00b5m) and large (>53 \u00b5m) marine particles were sampled on all three cruises using in situ pumps (WTS-LV, standard, 8 L min\u207b\u00b9; McLane Research Laboratories, East Falmouth); water was passed sequentially through 53 \u03bcm pore-size nylon mesh and 1 \u03bcm pore-size quartz microfiber (QMA) filters with 142 mm diameter using a mini-MULVFS filter holder (Bishop et al., 2012). On the spring cruise, one pump was equipped with a pump head and motor with a maximum flow rate of 30 L min\u207b\u00b9, and high volume samples of particles >53 \u00b5m were collected. The large particles collected on the nylon mesh were sonicated and concentrated into a pre-combusted 47 mm QMA filter. Marine particles were collected in two size fractions, small particles in combusted quartz filters (1-53 \u03bcm) and large particles in a nylon mesh (> 53 \u03bcm) using in situ McLane pumps during the three research cruises. The marine particles were analyzed for total Hg concentrations by acid assisted microwave digestions and aliquots were analyzed by cold vapor atomic fluorescence spectrophotometry. For THg isotope determination samples were combusted in a two-stage combustion furnace and Hg(0) g was trapped in a 1% KMnO4 solution. The 1% KMnO4 solution was analyzed for Hg stable isotope composition using a multiple collector inductively coupled plasma mass spectrometer. All the methods are detailed in Motta et al., (2019).
attribute	NC_GLOBAL	awards_0_award_nid	String	560590
attribute	NC_GLOBAL	awards_0_award_number	String	OCE-1433846
attribute	NC_GLOBAL	awards_0_data_url	String	http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1433846
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	Donald L. Rice
attribute	NC_GLOBAL	awards_0_program_manager_nid	String	51467
attribute	NC_GLOBAL	cdm_data_type	String	Other
attribute	NC_GLOBAL	comment	String	Mercury stable isotope values for marine particles PI: Joel D. Blum (University of Michigan) Co-PIs: Brian N. Popp, Kanesa Seraphin, Jeffrey C. Drazen (University of Hawaii), & Claudia Benitez-Nelson (University of South Carolina) Version date: 21-Feb-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	date_created	String	2020-01-28T19:05:57Z
attribute	NC_GLOBAL	date_modified	String	2020-02-24T15:51:22Z
attribute	NC_GLOBAL	defaultDataQuery	String	&time<now
attribute	NC_GLOBAL	doi	String	10.1575/1912/bco-dmo.788753.1
attribute	NC_GLOBAL	geospatial_vertical_max	double	690.0
attribute	NC_GLOBAL	geospatial_vertical_min	double	25.0
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/788753
attribute	NC_GLOBAL	institution	String	BCO-DMO
attribute	NC_GLOBAL	instruments_0_acronym	String	MLVPump
attribute	NC_GLOBAL	instruments_0_dataset_instrument_description	String	in situ pumps (WTS-LV, standard, McLane Research Laboratories)
attribute	NC_GLOBAL	instruments_0_dataset_instrument_nid	String	788766
attribute	NC_GLOBAL	instruments_0_description	String	The Large Volume Pumping System-WTS-LV can be one of several different models of Water Transfer Systems (WTS) Large Volume (LV) pumping systems designed and manufactured by McLane Research Labs (Falmouth, MA, USA). The WTS-LV systems are large volume in-situ filtration systems designed to collect sinking particulates. WTS-LV systems are individual in situ, battery-powered, pumping/filtration units that can be deployed at multiple depths per cast to provide information on how particle flux changes with depth. The McLane WTS-LV series of oceanographic pumps draw ambient water through filters and can pump large volumes of seawater during a single cast. The WTS-LV pumps are designed for use from a hydro-wire and employ advanced control algorithms to dynamically optimize flow rates as material accumulates on a filter.
attribute	NC_GLOBAL	instruments_0_instrument_name	String	Large Volume Pumping System-WTS-LV
attribute	NC_GLOBAL	instruments_0_instrument_nid	String	512
attribute	NC_GLOBAL	instruments_0_supplied_name	String	WTS-LV
attribute	NC_GLOBAL	instruments_1_acronym	String	ICP Mass Spec
attribute	NC_GLOBAL	instruments_1_dataset_instrument_description	String	multicollector inductively coupled plasma mass spectrometer (MC-ICP-MS; Nu instruments)
attribute	NC_GLOBAL	instruments_1_dataset_instrument_nid	String	788763
attribute	NC_GLOBAL	instruments_1_description	String	An ICP Mass Spec is an instrument that passes nebulized samples into an inductively-coupled gas plasma (8-10000 K) where they are atomized and ionized. Ions of specific mass-to-charge ratios are quantified in a quadrupole mass spectrometer.
attribute	NC_GLOBAL	instruments_1_instrument_external_identifier	String	https://vocab.nerc.ac.uk/collection/L05/current/LAB15/
attribute	NC_GLOBAL	instruments_1_instrument_name	String	Inductively Coupled Plasma Mass Spectrometer
attribute	NC_GLOBAL	instruments_1_instrument_nid	String	530
attribute	NC_GLOBAL	instruments_1_supplied_name	String	MC-ICP-MS
attribute	NC_GLOBAL	instruments_2_acronym	String	CVAFS
attribute	NC_GLOBAL	instruments_2_dataset_instrument_nid	String	788764
attribute	NC_GLOBAL	instruments_2_description	String	A Cold Vapor Atomic Fluorescent Spectrophotometer (CVAFS) is an instrument used for quantitative determination of volatile heavy metals, such as mercury. CVAFS make use of the characteristic of mercury that allows vapor measurement at room temperature. Mercury atoms in an inert carrier gas are excited by a collimated UV light source at a particular wavelength. As the atoms return to their non-excited state they re-radiate their absorbed energy at the same wavelength. The fluorescence may be detected using a photomultiplier tube or UV photodiode.
attribute	NC_GLOBAL	instruments_2_instrument_name	String	Cold Vapor Atomic Fluorescence Spectrophotometer
attribute	NC_GLOBAL	instruments_2_instrument_nid	String	692
attribute	NC_GLOBAL	instruments_2_supplied_name	String	cold vapor atomic fluorescence spectrophotometry
attribute	NC_GLOBAL	keywords	String	bco, bco-dmo, biological, chemical, cruise, Cruise_Number, d199, D199Hg, d200, D200Hg, d201, D201Hg, d202, d202Hg, d204, D204Hg, data, dataset, date, depth, dmo, erddap, fraction, management, mean, Mean_Depth, number, oceanography, office, preliminary, size, Size_fraction
attribute	NC_GLOBAL	license	String	https://www.bco-dmo.org/dataset/788753/license
attribute	NC_GLOBAL	metadata_source	String	https://www.bco-dmo.org/api/dataset/788753
attribute	NC_GLOBAL	param_mapping	String	{'788753': {'Mean_Depth': 'master - depth'}}
attribute	NC_GLOBAL	parameter_source	String	https://www.bco-dmo.org/mapserver/dataset/788753/parameters
attribute	NC_GLOBAL	people_0_affiliation	String	University of Michigan
attribute	NC_GLOBAL	people_0_person_name	String	Joel D. Blum
attribute	NC_GLOBAL	people_0_person_nid	String	560587
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 South Carolina
attribute	NC_GLOBAL	people_1_person_name	String	Claudia R. Benitez-Nelson
attribute	NC_GLOBAL	people_1_person_nid	String	51092
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 Hawaii at Manoa
attribute	NC_GLOBAL	people_2_affiliation_acronym	String	SOEST
attribute	NC_GLOBAL	people_2_person_name	String	Jeffrey C. Drazen
attribute	NC_GLOBAL	people_2_person_nid	String	491313
attribute	NC_GLOBAL	people_2_role	String	Co-Principal Investigator
attribute	NC_GLOBAL	people_2_role_type	String	originator
attribute	NC_GLOBAL	people_3_affiliation	String	University of Hawaii at Manoa
attribute	NC_GLOBAL	people_3_affiliation_acronym	String	SOEST
attribute	NC_GLOBAL	people_3_person_name	String	Brian N. Popp
attribute	NC_GLOBAL	people_3_person_nid	String	51093
attribute	NC_GLOBAL	people_3_role	String	Co-Principal Investigator
attribute	NC_GLOBAL	people_3_role_type	String	originator
attribute	NC_GLOBAL	people_4_affiliation	String	University of Hawaii
attribute	NC_GLOBAL	people_4_person_name	String	Kanesa Seraphin
attribute	NC_GLOBAL	people_4_person_nid	String	537131
attribute	NC_GLOBAL	people_4_role	String	Co-Principal Investigator
attribute	NC_GLOBAL	people_4_role_type	String	originator
attribute	NC_GLOBAL	people_5_affiliation	String	Woods Hole Oceanographic Institution
attribute	NC_GLOBAL	people_5_affiliation_acronym	String	WHOI BCO-DMO
attribute	NC_GLOBAL	people_5_person_name	String	Shannon Rauch
attribute	NC_GLOBAL	people_5_person_nid	String	51498
attribute	NC_GLOBAL	people_5_role	String	BCO-DMO Data Manager
attribute	NC_GLOBAL	people_5_role_type	String	related
attribute	NC_GLOBAL	project	String	Hg_Biogeochemistry
attribute	NC_GLOBAL	projects_0_acronym	String	Hg_Biogeochemistry
attribute	NC_GLOBAL	projects_0_description	String	NSF award abstract: Mercury is a pervasive trace element that exists in several states in the marine environment, including monomethylmercury (MMHg), a neurotoxin that bioaccumulates in marine organisms and poses a human health threat. Understanding the fate of mercury in the ocean and resulting impacts on ocean food webs requires understanding the mechanisms controlling the depths at which mercury chemical transformations occur. Preliminary mercury analyses on nine species of marine fish from the North Pacific Ocean indicated that intermediate waters are an important entry point for MMHg into open ocean food webs. To elucidate the process controlling this, researchers will examine mercury dynamics in regions with differing vertical dissolved oxygen profiles, which should influence depths of mercury transformation. Results of the study will aid in a better understanding of the pathways by which mercury enters the marine food chain and can ultimately impact humans. This project will provide training for graduate and undergraduate students, and spread awareness on oceanic mercury through public outreach and informal science programs. Mercury isotopic variations can provide insight into a wide variety of environmental processes. Isotopic compositions of mercury display mass-dependent fractionation (MDF) during most biotic and abiotic chemical reactions and mass-independent fractionation (MIF) during photochemical radical pair reactions. The unusual combination of MDF and MIF can provide information on reaction pathways and the biogeochemical history of mercury. Results from preliminary research provide strong evidence that net MMHg formation occurred below the surface mixed layer in the pycnocline and suggested that MMHg in low oxygen intermediate waters is an important entry point for mercury into open ocean food webs. These findings highlight the critical need to understand how MMHg levels in marine biota will respond to changes in atmospheric mercury emissions, deposition of inorganic mercury to the surface ocean, and hypothesized future expansion of oxygen minimum zones. Using field collections across ecosystems with contrasting biogeochemistry and mercury isotope fractionation experiments researchers will fill key knowledge gaps in mercury biogeochemistry. Results of the proposed research will enable scientists to assess the biogeochemical controls on where in the water column mercury methylation and demethylation likely occur. Related background publication with supplemental data section: Joel D. Blum, Brian N. Popp, Jeffrey C. Drazen, C. Anela Choy & Marcus W. Johnson. 2013. Methylmercury production below the mixed layer in the North Pacific Ocean. Nature Geoscience 6, 879–884. doi:10.1038/ngeo1918
attribute	NC_GLOBAL	projects_0_end_date	String	2017-07
attribute	NC_GLOBAL	projects_0_geolocation	String	Pacific Subtropical Gyre, Station ALOHA 22.75N 158W; equatorial Pacific (10N 155W, 5N 155W)
attribute	NC_GLOBAL	projects_0_name	String	Collaborative Research: Isotopic insights to mercury in marine food webs and how it varies with ocean biogeochemistry
attribute	NC_GLOBAL	projects_0_project_nid	String	560580
attribute	NC_GLOBAL	projects_0_start_date	String	2014-08
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	This dataset contains the mercury stable isotope ratios collected in marine particles during R/V Kilo Moana cruises around Station ALOHA. These data were published in Motta et al., (2019) with supporting information.
attribute	NC_GLOBAL	title	String	[Hg Isotopes Particles] - Mercury stable isotope values for marine particles from R/V Kilo Moana cruises KM1418, KM1407 and KM1506 around station ALOHA in 2014 and 2015 (Collaborative Research: Isotopic insights to mercury in marine food webs and how it varies with ocean biogeochemistry)
attribute	NC_GLOBAL	version	String	1
attribute	NC_GLOBAL	xml_source	String	osprey2erddap.update_xml() v1.3
variable	Cruise_Number		String
attribute	Cruise_Number	bcodmo_name	String	cruise_id
attribute	Cruise_Number	description	String	Cruise ID number
attribute	Cruise_Number	long_name	String	Cruise Number
attribute	Cruise_Number	units	String	unitless
variable	Date		int
attribute	Date	_FillValue	int	2147483647
attribute	Date	actual_range	int	20140219, 20150502
attribute	Date	bcodmo_name	String	date
attribute	Date	description	String	Sampling date (UTC); format: yyyymmdd
attribute	Date	long_name	String	Date
attribute	Date	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/
attribute	Date	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	25.0, 690.0
attribute	depth	axis	String	Z
attribute	depth	bcodmo_name	String	depth
attribute	depth	description	String	Mean depth of sample
attribute	depth	ioos_category	String	Location
attribute	depth	long_name	String	Mean 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	Size_fraction		String
attribute	Size_fraction	bcodmo_name	String	samp_fraction
attribute	Size_fraction	description	String	Size fraction
attribute	Size_fraction	long_name	String	Size Fraction
attribute	Size_fraction	units	String	micrometers (um)
variable	d202Hg		float
attribute	d202Hg	_FillValue	float	NaN
attribute	d202Hg	actual_range	float	-0.27, 0.17
attribute	d202Hg	bcodmo_name	String	unknown
attribute	d202Hg	description	String	Stable isotope ratio; δ202Hg
attribute	d202Hg	long_name	String	D202 HG
attribute	d202Hg	units	String	per mil (‰)
variable	D199Hg		float
attribute	D199Hg	_FillValue	float	NaN
attribute	D199Hg	actual_range	float	0.05, 0.37
attribute	D199Hg	bcodmo_name	String	unknown
attribute	D199Hg	description	String	Stable isotope ratio; Δ199Hg
attribute	D199Hg	long_name	String	D199 HG
attribute	D199Hg	units	String	per mil (‰)
variable	D201Hg		float
attribute	D201Hg	_FillValue	float	NaN
attribute	D201Hg	actual_range	float	0.04, 0.32
attribute	D201Hg	bcodmo_name	String	unknown
attribute	D201Hg	description	String	Stable isotope ratio; Δ201Hg
attribute	D201Hg	long_name	String	D201 HG
attribute	D201Hg	units	String	per mil (‰)
variable	D200Hg		float
attribute	D200Hg	_FillValue	float	NaN
attribute	D200Hg	actual_range	float	-0.07, 0.11
attribute	D200Hg	bcodmo_name	String	unknown
attribute	D200Hg	description	String	Stable isotope ratio; Δ200Hg
attribute	D200Hg	long_name	String	D200 HG
attribute	D200Hg	units	String	per mil (‰)
variable	D204Hg		float
attribute	D204Hg	_FillValue	float	NaN
attribute	D204Hg	actual_range	float	-0.19, 0.08
attribute	D204Hg	bcodmo_name	String	unknown
attribute	D204Hg	description	String	Stable isotope ratio; D204Hg
attribute	D204Hg	long_name	String	D204 HG
attribute	D204Hg	units	String	per mil (‰)

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.