bcodmo_dataset_925359_v1

Name: [Aerosol REE and Th-232 data from northern Gulf of Alaska region] - Concentrations of the rare earth elements (REE) and Thorium-232 (232Th) from the northern Gulf of Alaska region (Inferring trace element inputs to North Pacific surface waters from Alaskan and Asian dust)
Creator: BCO-DMO
License: The data may be used and redistributed for free but is not intended for legal use, since it may contain inaccuracies. Neither the data Contributor, ERD, NOAA, nor the United States Government, nor any of their employees or contractors, makes any warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, or assumes any legal liability for the accuracy, completeness, or usefulness, of this information.

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	[Aerosol REE and Th-232 data from northern Gulf of Alaska region] - Concentrations of the rare earth elements (REE) and Thorium-232 (232Th) from the northern Gulf of Alaska region (Inferring trace element inputs to North Pacific surface waters from Alaskan and Asian dust)		F I M	background			BCO-DMO	bcodmo_dataset_925359_v1

The Dataset's Variables and Attributes

Row Type	Variable Name	Attribute Name	Data Type	Value
attribute	NC_GLOBAL	cdm_data_type	String	Other
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_url	String	https://www.bco-dmo.org/
attribute	NC_GLOBAL	doi	String	10.26008/1912/bco-dmo.925359.1
attribute	NC_GLOBAL	Easternmost_Easting	double	-145.0954
attribute	NC_GLOBAL	geospatial_lat_max	double	60.4324
attribute	NC_GLOBAL	geospatial_lat_min	double	59.42144
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	double	-145.0954
attribute	NC_GLOBAL	geospatial_lon_min	double	-146.3493
attribute	NC_GLOBAL	geospatial_lon_units	String	degrees_east
attribute	NC_GLOBAL	infoUrl	String	https://www.bco-dmo.org/dataset/925359
attribute	NC_GLOBAL	institution	String	BCO-DMO
attribute	NC_GLOBAL	license	String	The data may be used and redistributed for free but is not intended for legal use, since it may contain inaccuracies. Neither the data Contributor, ERD, NOAA, nor the United States Government, nor any of their employees or contractors, makes any warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, or assumes any legal liability for the accuracy, completeness, or usefulness, of this information.
attribute	NC_GLOBAL	Northernmost_Northing	double	60.4324
attribute	NC_GLOBAL	sourceUrl	String	(local files)
attribute	NC_GLOBAL	Southernmost_Northing	double	59.42144
attribute	NC_GLOBAL	summary	String	Concentrations of the rare earth elements (REE) and Thorium-232 (232Th) are presented for filtered air (dust) samples collected from the northern Gulf of Alaska region, including from Middleton Island (AK)(59.4214 N, 146.3493 W) and the Copper River delta (60.4324 N, 145.0954 W). Size-fractionated samples were collected in November 2019, using a Tisch Volumetric Flow Controlled (VFC) high volume sampler (Tisch Environmental, TE-5170V- BL) outfitted with a Cascade impactor. The six size fractions collected ranged from <0.49 micrometers (um) to >7.2 um in diameter. This sampler technology is discussed in greater detail in Morton et al, 2013. Samples were filtered with acid-washed Whatman 41 (W41) cellulose fiber filters. Additional bulk dust samples were collected in October 2012, using a Thermo Partisol Plus 2025 using Teflon filters. Samples were fully digested using concentrated nitric and hydrofluoric acids, following the approach of Morton et al, 2013. Samples were analyzed using a Thermofisher iCAP inductively coupled plasma mass spectrometer (ICP-MS) in KED mode, with He as a collision cell gas, adapted from the approach of Trommetter et al (2020). Concentrations were determined from standard curves using a REE ICP-MS standard from High-Purity Standards (that also contained 232Th). Three internal standards (Ge, In, and Bi) were added to both samples and standards, to correct for short-term variability in the instrument response and to evaluate stability of mass response during the ICP-MS run. Concentration estimates for the REE and 232Th were blank-corrected using full-process blanks that included filters deployed during times when there was no known dust deposition. Most of the full-process blank concentrations were 100 times or more smaller than the concentrations of our lowest standard (with the exception of Ce, the concentration of which was ~seven times smaller than our lowest standard. This means that our blank concentrations were very low but also not quantified extremely accurately. Our best estimates are that the full-process blanks, including filters, ranged from 0.02 picograms per square centimeter (pg cm-2) for Eu, Tb, and Ho, to 2 pg cm-2 for Ce. These blank concentrations were in all cases 40 times or more smaller than our lowest REE sample concentration for the <0.49 um size fraction with the smallest amount of dust, and ~3 orders of magnitude smaller than the signal of the largest samples. The REE data are also presented in a double-normalized format that first normalizes to concentrations of Post Archean Australian Shale and then normalizes to the mean REE concentration. The normalization approach is slightly modified from that of Serno et al, 2014.
attribute	NC_GLOBAL	title	String	[Aerosol REE and Th-232 data from northern Gulf of Alaska region] - Concentrations of the rare earth elements (REE) and Thorium-232 (232Th) from the northern Gulf of Alaska region (Inferring trace element inputs to North Pacific surface waters from Alaskan and Asian dust)
attribute	NC_GLOBAL	Westernmost_Easting	double	-146.3493
variable	sample_description		String
attribute	sample_description	long_name	String	Sample_description
attribute	sample_description	units	String	unitless
variable	location_description		String
attribute	location_description	long_name	String	Location_description
attribute	location_description	units	String	unitless
variable	latitude		float
attribute	latitude	_CoordinateAxisType	String	Lat
attribute	latitude	actual_range	float	59.42144, 60.4324
attribute	latitude	axis	String	Y
attribute	latitude	ioos_category	String	Location
attribute	latitude	long_name	String	Latitude
attribute	latitude	standard_name	String	latitude
attribute	latitude	units	String	degrees_north
variable	longitude		float
attribute	longitude	_CoordinateAxisType	String	Lon
attribute	longitude	actual_range	float	-146.3493, -145.0954
attribute	longitude	axis	String	X
attribute	longitude	ioos_category	String	Location
attribute	longitude	long_name	String	Longitude
attribute	longitude	standard_name	String	longitude
attribute	longitude	units	String	degrees_east
variable	ISO_Date_UTC		String
attribute	ISO_Date_UTC	long_name	String	Iso_date_utc
attribute	ISO_Date_UTC	units	String	unitless
variable	La		float
attribute	La	actual_range	float	16.14, 38.2
attribute	La	long_name	String	La
attribute	La	units	String	ppm (ug/g)
variable	Ce		float
attribute	Ce	actual_range	float	32.74, 79.6
attribute	Ce	long_name	String	Ce
attribute	Ce	units	String	ppm (ug/g)
variable	Pr		float
attribute	Pr	actual_range	float	3.91, 8.83
attribute	Pr	long_name	String	Pr
attribute	Pr	units	String	ppm (ug/g)
variable	Nd		float
attribute	Nd	actual_range	float	15.95, 33.9
attribute	Nd	long_name	String	Nd
attribute	Nd	units	String	ppm (ug/g)
variable	Sm		float
attribute	Sm	actual_range	float	3.49, 5.55
attribute	Sm	long_name	String	Sm
attribute	Sm	units	String	ppm (ug/g)
variable	Eu		float
attribute	Eu	actual_range	float	0.89, 1.22
attribute	Eu	long_name	String	Eu
attribute	Eu	units	String	ppm (ug/g)
variable	Gd		float
attribute	Gd	actual_range	float	3.36, 4.66
attribute	Gd	long_name	String	Gd
attribute	Gd	units	String	ppm (ug/g)
variable	Tb		float
attribute	Tb	actual_range	float	0.51, 0.77
attribute	Tb	long_name	String	Tb
attribute	Tb	units	String	ppm (ug/g)
variable	Dy		float
attribute	Dy	actual_range	float	3.04, 4.68
attribute	Dy	long_name	String	Dy
attribute	Dy	units	String	ppm (ug/g)
variable	Ho		float
attribute	Ho	actual_range	float	0.6, 0.99
attribute	Ho	long_name	String	Ho
attribute	Ho	units	String	ppm (ug/g)
variable	Er		float
attribute	Er	actual_range	float	1.78, 2.85
attribute	Er	long_name	String	Er
attribute	Er	units	String	ppm (ug/g)
variable	Tm		float
attribute	Tm	actual_range	float	0.25, 0.41
attribute	Tm	long_name	String	Tm
attribute	Tm	units	String	ppm (ug/g)
variable	Yb		float
attribute	Yb	actual_range	float	1.58, 2.82
attribute	Yb	long_name	String	Yb
attribute	Yb	units	String	ppm (ug/g)
variable	Lu		float
attribute	Lu	actual_range	float	0.24, 0.43
attribute	Lu	long_name	String	Lu
attribute	Lu	units	String	ppm (ug/g)
variable	Th232		float
attribute	Th232	actual_range	float	4.15, 5.43
attribute	Th232	long_name	String	Th232
attribute	Th232	units	String	ppm (ug/g)
variable	NOTES		String
attribute	NOTES	long_name	String	Notes
attribute	NOTES	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.