ERDDAP > info > bcodmo_dataset_813159

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	[Sediment porosity] - Porosity from sediment cores collected on the R/V Nathaniel B. Palmer cruise NBP1601 to the West Antarctic continental shelf in January of 2016 (Organic Carbon Oxidation and Iron Remobilization by West Antarctic Shelf Sediments)		F   I   M	background			BCO-DMO	bcodmo_dataset_813159

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	Sediment and pore water collection: Short sediment cores were collected using a Bowers & Connelly megacorer, a multiple coring device that can collect ~20-40 cm long sediment cores with undisturbed sediment surfaces. At two sites (stations 41 and 64) longer cores (up to ~2 m) were also collected with a Kasten corer. Megacorer cores were either sectioned for solid phase analysis, profiled with polarographic microelectrodes to determine dissolved O2 concentrations, or sectioned in a cold van under N2 for pore water sample extraction. Samples for solid phase analyses were placed in pre-cleaned screw-capped vials and frozen for porosity determinations at the New England Oceanographic Laboratory (NEOL). Kasten cores were brought into a large cold room on-board ship, laid on their side and one side of the core box removed to expose the sediment in the core. A plastic block was placed against the top of the core to prevent slumping of the sediment during processing, and pore waters were collected from these cores using Rhizon samplers inserted directly into the cores at measured intervals. After pore water sampling was complete, samples for solid phase analyses were removed from the cores with plastic spoons and again placed in pre-cleaned screw-capped vials for porosity determinations. While it is possible to recover cores with intact sediment-water interfaces using a megacorer, loss of surface sediments is typical during Kasten coring, making it not possible to directly determine absolute depths below the sediment-water interface in a Kasten core. We therefore determined the absolute depths of pore water and solid phase sample intervals from Kasten cores by aligning Kasten core profiles of pore water alkalinity to megacore alkalinity profiles from the same site (Berelson et al., 2005; Komada et al., 2016). Sediment porosity determination: The water content of the frozen porosity samples was determined by weight difference, where each sample was thawed, and a portion weighed, dried at 60\u00b0C for 24 hours and then reweighed. The porosity was expressed in terms of ml of seawater per cubic centimeter of whole sediments, where the weight of dried sediment was reduced by the weight of sea salts within the pore water (assuming bottom water salinity), and the volume of dried sediments was calculated assuming a dry density of 2.65 g cm-3 (Christensen, 1989).
attribute	NC_GLOBAL	awards_0_award_nid	String	806863
attribute	NC_GLOBAL	awards_0_award_number	String	OPP-1551195
attribute	NC_GLOBAL	awards_0_data_url	String	http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1551195
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	Michael E. Jackson
attribute	NC_GLOBAL	awards_0_program_manager_nid	String	806862
attribute	NC_GLOBAL	cdm_data_type	String	Other
attribute	NC_GLOBAL	comment	String	Sediment porosity PI: David J Burdige Data Version 1: 2020-06-08
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	2020-05-27T22:58:29Z
attribute	NC_GLOBAL	date_modified	String	2020-06-17T23:08:00Z
attribute	NC_GLOBAL	defaultDataQuery	String	&time<now
attribute	NC_GLOBAL	doi	String	10.26008/1912/bco-dmo.813159.1
attribute	NC_GLOBAL	Easternmost_Easting	double	-62.7317
attribute	NC_GLOBAL	geospatial_lat_max	double	-64.1583
attribute	NC_GLOBAL	geospatial_lat_min	double	-67.7717
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	double	-62.7317
attribute	NC_GLOBAL	geospatial_lon_min	double	-71.2217
attribute	NC_GLOBAL	geospatial_lon_units	String	degrees_east
attribute	NC_GLOBAL	infoUrl	String	https://www.bco-dmo.org/dataset/813159
attribute	NC_GLOBAL	institution	String	BCO-DMO
attribute	NC_GLOBAL	instruments_0_acronym	String	Gravity Corer
attribute	NC_GLOBAL	instruments_0_dataset_instrument_nid	String	814587
attribute	NC_GLOBAL	instruments_0_description	String	The gravity corer allows researchers to sample sediment layers at the bottom of lakes or oceans. The coring device is deployed from the ship and gravity carries it to the seafloor. (https://www.whoi.edu/instruments/viewInstrument.do?id=1079).
attribute	NC_GLOBAL	instruments_0_instrument_external_identifier	String	https://vocab.nerc.ac.uk/collection/L05/current/51/
attribute	NC_GLOBAL	instruments_0_instrument_name	String	Gravity Corer
attribute	NC_GLOBAL	instruments_0_instrument_nid	String	531
attribute	NC_GLOBAL	instruments_0_supplied_name	String	Kasten corer
attribute	NC_GLOBAL	instruments_1_acronym	String	Multi Corer
attribute	NC_GLOBAL	instruments_1_dataset_instrument_nid	String	814586
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	Bowers & Connelly megacorer
attribute	NC_GLOBAL	keywords	String	bco, bco-dmo, biological, chemical, core, data, dataset, date, depth, dmo, erddap, error, iso, ISO_DateTime_UTC, latitude, longitude, management, oceanography, office, porosity, preliminary, Sa_ID, St_ID, time
attribute	NC_GLOBAL	license	String	https://www.bco-dmo.org/dataset/813159/license
attribute	NC_GLOBAL	metadata_source	String	https://www.bco-dmo.org/api/dataset/813159
attribute	NC_GLOBAL	Northernmost_Northing	double	-64.1583
attribute	NC_GLOBAL	param_mapping	String	{'813159': {'Lat': 'master - latitude', 'Lon': 'master - longitude', 'ISO_DateTime_UTC': 'master - time'}}
attribute	NC_GLOBAL	parameter_source	String	https://www.bco-dmo.org/mapserver/dataset/813159/parameters
attribute	NC_GLOBAL	people_0_affiliation	String	Old Dominion University
attribute	NC_GLOBAL	people_0_affiliation_acronym	String	ODU
attribute	NC_GLOBAL	people_0_person_name	String	David J Burdige
attribute	NC_GLOBAL	people_0_person_nid	String	648653
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	New England Oceanographic Laboratory
attribute	NC_GLOBAL	people_1_affiliation_acronym	String	NEOL
attribute	NC_GLOBAL	people_1_person_name	String	John P Christensen
attribute	NC_GLOBAL	people_1_person_nid	String	51603
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 D. 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	Antarctic Shelf Sediments
attribute	NC_GLOBAL	projects_0_acronym	String	Antarctic Shelf Sediments
attribute	NC_GLOBAL	projects_0_description	String	NSF Award Abstract: General Statement: The continental shelf region west of the Antarctic Peninsula has recently undergone dramatic changes and ecosystem shifts, and the community of organisms that live in, or feed off, the sea floor sediments is being impacted by species invasions from the north. Previous studies of these sediments indicate that this community may consume much more of the regional productivity than previously estimated, suggesting that sediments are a rich and important component of this ecosystem and one that may be ripe for dramatic change. Furthermore, under richer sediment conditions, iron is mobilized and released back to the water column. Since productivity in this ecosystem is thought to be limited by the availability of iron, increased rates of iron release from these sediments could stimulate productivity and promote greater overall ecosystem change. In this research, a variety of sites across the shelf region will be sampled to accurately evaluate the role of sediments in consuming ecosystem productivity and to estimate the current level of iron release from the sediments. This project will provide a baseline set of sediment results that will present a more complete picture of the west Antarctic shelf ecosystem, will allow for comparison with water column measurements and for evaluation of the fundamental workings of this important ecosystem. This is particularly important since high latitude systems may be vulnerable to the effects of climate fluctuations. Both graduate and undergraduate students will be trained. Presentations will be made at scientific meetings, at other universities, and at outreach events. A project web site will present key results to the public and explain how this new information improves understanding of Antarctic ecosystems. Technical Description of Project: In order to determine the role of sediments within the west Antarctic shelf ecosystem, this project will determine the rates of sediment organic matter oxidation at a variety of sites across the Palmer Long Term Ecosystem Research (LTER) study region. To estimate the rates of release of iron and manganese from the sediments, these same sites will be sampled for detailed vertical distributions of the concentrations of these metals both in the porewaters and in important mineral phases. Since sediment sampling will be done at LTER sites, the sediment data can be correlated with the rich productivity data set from the LTER. In detail, the project: a) will determine the rates of oxygen consumption, organic carbon oxidation, nutrient release, and iron mobilization by shelf sediments west of the Antarctic Peninsula; b) will investigate the vertical distribution of diagenetic reactions within the sediments; and c) will assess the regional importance of these sediment rates. Sediment cores will be used to determine sediment-water fluxes of dissolved oxygen, total carbon dioxide, nutrients, and the vertical distributions of these dissolved compounds, as well as iron and manganese in the pore waters. Bulk sediment properties of porosity, organic carbon and nitrogen content, carbonate content, biogenic silica content, and multiple species of solid-phase iron, manganese, and sulfur species will also be determined. These measurements will allow determination of total organic carbon oxidation and denitrification rates, and the proportion of aerobic versus anaerobic respiration at each site. Sediment diagenetic modeling will link the processes of organic matter oxidation to metal mobilization. Pore water and solid phase iron and manganese distributions will be used to model iron diagenesis in these sediments and to estimate the iron flux from the sediments to the overlying waters. Finally, the overall regional average and distribution of the sediment processes will be compared with the distributions of seasonally averaged chlorophyll biomass and productivity.
attribute	NC_GLOBAL	projects_0_end_date	String	2020-02
attribute	NC_GLOBAL	projects_0_geolocation	String	West Antarctic Continental Shelf
attribute	NC_GLOBAL	projects_0_name	String	Organic Carbon Oxidation and Iron Remobilization by West Antarctic Shelf Sediments
attribute	NC_GLOBAL	projects_0_project_nid	String	806864
attribute	NC_GLOBAL	projects_0_start_date	String	2015-09
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	-67.7717
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v55
attribute	NC_GLOBAL	summary	String	Porosity from sediment cores collected on the R/V Nathaniel B. Palmer cruise NBP1601 to the West Antarctic continental shelf in January of 2016.
attribute	NC_GLOBAL	time_coverage_start	String	2016-01-14T17:34:00Z
attribute	NC_GLOBAL	title	String	[Sediment porosity] - Porosity from sediment cores collected on the R/V Nathaniel B. Palmer cruise NBP1601 to the West Antarctic continental shelf in January of 2016 (Organic Carbon Oxidation and Iron Remobilization by West Antarctic Shelf Sediments)
attribute	NC_GLOBAL	version	String	1
attribute	NC_GLOBAL	Westernmost_Easting	double	-71.2217
attribute	NC_GLOBAL	xml_source	String	osprey2erddap.update_xml() v1.5
variable	St_ID		String
attribute	St_ID	bcodmo_name	String	station
attribute	St_ID	description	String	station ID number
attribute	St_ID	long_name	String	St ID
attribute	St_ID	units	String	unitless
variable	Sa_ID		String
attribute	Sa_ID	bcodmo_name	String	sample
attribute	Sa_ID	description	String	sample ID (station ID #-core ID #-sample #)
attribute	Sa_ID	long_name	String	Sa ID
attribute	Sa_ID	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P02/current/ACYC/
attribute	Sa_ID	units	String	unitless
variable	Core		String
attribute	Core	bcodmo_name	String	sample_type
attribute	Core	description	String	core type (M = mega-corer; K = Kasten core)
attribute	Core	long_name	String	Core
attribute	Core	units	String	unitless
variable	Depth		float
attribute	Depth	_FillValue	float	NaN
attribute	Depth	actual_range	float	0.25, 225.0
attribute	Depth	bcodmo_name	String	depth_bsf
attribute	Depth	colorBarMaximum	double	8000.0
attribute	Depth	colorBarMinimum	double	-8000.0
attribute	Depth	colorBarPalette	String	TopographyDepth
attribute	Depth	description	String	sediment depth
attribute	Depth	long_name	String	Depth
attribute	Depth	standard_name	String	depth
attribute	Depth	units	String	centimeters (cm)
variable	Error		float
attribute	Error	_FillValue	float	NaN
attribute	Error	actual_range	float	0.25, 5.0
attribute	Error	bcodmo_name	String	sample_descrip
attribute	Error	colorBarMaximum	double	50.0
attribute	Error	colorBarMinimum	double	0.0
attribute	Error	description	String	half of the thickness of the sediment sample
attribute	Error	long_name	String	Error
attribute	Error	units	String	centimeters (cm)
variable	Porosity		float
attribute	Porosity	_FillValue	float	NaN
attribute	Porosity	actual_range	float	0.682, 0.999
attribute	Porosity	bcodmo_name	String	porosity
attribute	Porosity	description	String	sediment porosity
attribute	Porosity	long_name	String	Porosity
attribute	Porosity	units	String	ml porewater/cm^3 total sediment
variable	time		double
attribute	time	_CoordinateAxisType	String	Time
attribute	time	actual_range	double	1.45279284E9, NaN
attribute	time	axis	String	T
attribute	time	bcodmo_name	String	ISO_DateTime_UTC
attribute	time	description	String	station timestamp (UTC) in ISO 8601 format yyyy-mm-ddTHH:MM
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	standard_name	String	time
attribute	time	time_origin	String	01-JAN-1970 00:00:00
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	-67.7717, -64.1583
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	station latitude, south is negative
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	-71.2217, -62.7317
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	station longitude, west is negative
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

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.