Sediment trap and water column chemistry, Baltimore Canyon, U.S. Mid-Atlantic Bight

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What does this data set describe?

1. How might this data set be cited?
   Prouty, Nancy G., Mienis, Furu, Campbell, Pamela L., and Roark, E. Brendan, 2017, Sediment trap and water column chemistry, Baltimore Canyon, U.S. Mid-Atlantic Bight: data release DOI:10.5066/F7NC5ZCQ, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

   Online Links:

   • https://doi.org/10.5066/F7NC5ZCQ
   • https://www.sciencebase.gov/catalog/file/get/593060d0e4b0e9bd0ea8eae6

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -73.84923
   East_Bounding_Coordinate: -73.71730
   North_Bounding_Coordinate: 38.22602
   South_Bounding_Coordinate: 38.02747
   

3. What does it look like?

   https://www.sciencebase.gov/catalog/file/get/593060d0e4b0e9bd0ea8eae6?name=BaltimoreCanyonMap.jpg&allowOpen=true (JPG)

   Location map of Baltimore Canyon off the east coast of the State of Delaware

4. Does the data set describe conditions during a particular time period?

   Beginning_Date: 21-Aug-2012

   Ending_Date: 23-Jun-2013

   Currentness_Reference:

   Ground condition at time data were collected

5. What is the general form of this data set?

   Geospatial_Data_Presentation_Form: comma-delimited text
   

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?
      This is a point data set. It contains the following vector data types (SDTS terminology):
      • Point (83)
   2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.01. Longitudes are given to the nearest 0.01. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.
      
7. How does the data set describe geographic features?

   BaltimoreCanyon_chemistry.csv

   Table containing results from analyses of organic biomarker composition and bulk characteristics of sediment trap and water column geochemistry. (Source: Producer defined)

   Station

   Station number listed as vessel-year-number. Vessel abbreviations is as follows: NF=Nancy Foster. Year is designated with four digits, and number is a sequential number assigned by the vessel. Gaps in sequential numbers are common, as not all stations had samples collected or analyzed. (Source: producer defined) Station number listed as vessel-year-station number.

   Date of Collection

   Calendar date (month/day/year) when sample was collected in the field (Source: producer defined)

   Range of values
   Minimum:	8/21/2012
   Maximum:	6/23/2013
   Units:	month/day/year

   Depth

   Depth in meters of sample collection (Source: producer defined)

   Range of values
   Minimum:	10
   Maximum:	1318
   Units:	meters (m)
   Resolution:	1

   Latitude

   Latitude (Source: based on ship and ROV navigation systems)

   Range of values
   Minimum:	38.04238
   Maximum:	38.15040
   Units:	decimal degrees
   Resolution:	0.00001

   Longitude

   Longitude (Source: based on ship and ROV navigation systems)

   Range of values
   Minimum:	-73.84923
   Maximum:	-73.71730
   Units:	decimal degrees
   Resolution:	0.00001

   Sample Type

   Explains the sample type (Source: producer defined)

   Value	Definition
   sediment	sediment trap material
   seawater	filtered seawater from water column
   particulate	Water column particulate matter

   Mass Flux

   Sediment trap mass flux. An empty cell in the spreadsheet indicates that mass flux was not calculated for every sample. (Source: producer defined)

   Range of values
   Minimum:	2.5
   Maximum:	52.2
   Units:	grams per square meter per day
   Resolution:	0.1

   Percent Nitrogen

   Sediment percent nitrogen as measured on an elemental analyzer. An empty cell in the spreadsheet indicates that percent nitrogen was not calculated for every sample. (Source: standard reporting value in isotope chemistry)

   Range of values
   Minimum:	0.36
   Maximum:	0.43
   Units:	molar percent (%)
   Resolution:	0.01

   delta-N-15

   delta-N-15 is a measure of the ratio of stable isotopes nitrogen-15:nitrogen-14 in sediment, reported in parts per thousand (per mil). An empty cell in the spreadsheet indicates that 15N:14N was not calculated for every sample. (Source: standard reporting value in isotope chemistry)

   Range of values
   Minimum:	47.73
   Maximum:	74.40
   Units:	parts per thousand (per mil)
   Resolution:	0.01

   Percent Organic Carbon

   Sediment percent organic carbon as measured on an elemental analyzer. An empty cell in the spreadsheet indicates that percent carbon was not calculated for every sample. (Source: standard reporting value in isotope chemistry)

   Range of values
   Minimum:	3.21
   Maximum:	4.36
   Units:	molar percent (%)
   Resolution:	0.01

   delta-C-13

   delta-C-13 is a measure of the ratio of stable isotopes Carbon-13:Carbon-12, reported in parts per thousand (per mil). An empty cell in the spreadsheet indicates that 13C:12C was not calculated for every sample. (Source: standard reporting value in isotope chemistry)

   Range of values
   Minimum:	-22.80
   Maximum:	-22.00
   Units:	parts per thousand (per mil)
   Resolution:	0.01

   Carbon:Nitrogen

   ratio of carbon to nitrogen. An empty cell in the spreadsheet indicates that Carbon:Nitrogen was not calculated for every sample. (Source: producer defined)

   Range of values
   Minimum:	8.8
   Maximum:	10.6
   Units:	molar ratio
   Resolution:	0.1

   Lead-210

   Lead-210 activity of sediment trap samples determined by alpha spectrometry and used as an indicator for the relative proportion of suspended and freshly settled material. An empty cell in the spreadsheet indicates that Lead-210 was not calculated for every sample. (Source: standard reporting value in isotope chemistry)

   Range of values
   Minimum:	713
   Maximum:	1514
   Units:	milli becquerel per gram
   Resolution:	1

   chlorophyll a

   Concentrations of chlorophyll a and its derivatives (phaeophorbides, phaeophytines. If the cell contains n/a then chlorophyll a concentration was not available. (Source: standard reporting value)

   Range of values
   Minimum:	0.9
   Maximum:	16.1
   Units:	microgram per square meter per day
   Resolution:	0.1

   n-alkane 14

   concentration of straight chain alkane with 14 carbon atoms normalized to organic carbon. An empty cell in the spreadsheet indicates that n-alkane 14 was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.01
   Maximum:	0.07
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   n-alkane 15

   concentration of straight chain alkane with 15 carbon atoms normalized to organic carbon. An empty cell in the spreadsheet indicates that n-alkane 15 was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.01
   Maximum:	0.12
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   n-alkane 16

   concentration of straight chain alkane with 16 carbon atoms normalized to organic carbon. An empty cell in the spreadsheet indicates that n-alkane 16 was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.00
   Maximum:	0.10
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   n-alkane 17

   concentration of straight chain alkane with 17 carbon atoms normalized to organic carbon. An empty cell in the spreadsheet indicates that n-alkane 17 was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.01
   Maximum:	0.04
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   pristane

   concentration of pristane normalized to organic carbon. An empty cell in the spreadsheet indicates that pristane was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.01
   Maximum:	0.19
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   n-alkane 18

   concentration of straight chain alkane with 18 carbon atoms normalized to organic carbon. An empty cell in the spreadsheet indicates that n-alkane 18 was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.01
   Maximum:	0.27
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   phytane

   concentration of phytane normalized to organic carbon. An empty cell in the spreadsheet indicates that phytane was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.01
   Maximum:	0.12
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   n-alkane 19

   concentration of straight chain alkane with 19 carbon atoms normalized to organic carbon. An empty cell in the spreadsheet indicates that n-alkane 19 was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.01
   Maximum:	0.06
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   n-alkane 20

   concentration of straight chain alkane with 20 carbon atoms normalized to organic carbon. An empty cell in the spreadsheet indicates that n-alkane 20 was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.01
   Maximum:	0.14
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   n-alkane 21

   concentration of straight chain alkane with 21 carbon atoms normalized to organic carbon. An empty cell in the spreadsheet indicates that n-alkane 21 was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.01
   Maximum:	0.17
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   n-alkane 22

   concentration of straight chain alkane with 22 carbon atoms normalized to organic carbon. An empty cell in the spreadsheet indicates that n-alkane 22 was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.01
   Maximum:	0.16
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   n-alkane 23

   concentration of straight chain alkane with 23 carbon atoms normalized to organic carbon. An empty cell in the spreadsheet indicates that n-alkane 23 was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.02
   Maximum:	0.21
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   n-alkane 24

   concentration of straight chain alkane with 24 carbon atoms normalized to organic carbon. An empty cell in the spreadsheet indicates that n-alkane 24 was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.04
   Maximum:	3.67
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   n-alkane 25

   concentration of straight chain alkane with 25 carbon atoms normalized to organic carbon. An empty cell in the spreadsheet indicates that n-alkane 25 was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.04
   Maximum:	0.36
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   n-alkane 26

   concentration of straight chain alkane with 26 carbon atoms normalized to organic carbon. An empty cell in the spreadsheet indicates that n-alkane 26 was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.00
   Maximum:	0.70
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   n-alkane 27

   concentration of straight chain alkane with 27 carbon atoms normalized to organic carbon. An empty cell in the spreadsheet indicates that n-alkane 27 was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.06
   Maximum:	1.56
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   n-alkane 28

   concentration of straight chain alkane with 28 carbon atoms normalized to organic carbon. An empty cell in the spreadsheet indicates that n-alkane 28 was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.01
   Maximum:	1.94
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   n-alkane 29

   concentration of straight chain alkane with 29 carbon atoms normalized to organic carbon. An empty cell in the spreadsheet indicates that n-alkane 29 was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.05
   Maximum:	2.55
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   n-alkane 30

   concentration of straight chain alkane with 30 carbon atoms normalized to organic carbon. An empty cell in the spreadsheet indicates that n-alkane 30 was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.19
   Maximum:	1.75
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   n-alkane 31

   concentration of straight chain alkane with 31 carbon atoms normalized to organic carbon. An empty cell in the spreadsheet indicates that n-alkane 31 was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.04
   Maximum:	1.32
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   n-alkane 32

   concentration of straight chain alkane with 32 carbon atoms normalized to organic carbon. An empty cell in the spreadsheet indicates that n-alkane 32 was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.01
   Maximum:	0.53
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   coprostanol

   concentration of the sterol coprostanol normalized to organic carbon. An empty cell in the spreadsheet indicates that coprostanol was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.00
   Maximum:	0.20
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   epicoprostanol

   concentration of the sterol epicoprostanol normalized to organic carbon. An empty cell in the spreadsheet indicates that epicoprostanol was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.00
   Maximum:	0.41
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   5-β-coprostanone

   concentration of the sterol 5-β-coprostanone normalized to organic carbon. An empty cell in the spreadsheet indicates that 5-β-coprostanaone was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.05
   Maximum:	2.05
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   22-dehydrocholesterol

   concentration of the sterol 22-dehydrocholesterol normalized to organic carbon. An empty cell in the spreadsheet indicates that 22-dehydrocholesterol was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.30
   Maximum:	6.15
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   cholesterol

   concentration of the sterol cholesterol normalized to organic carbon. An empty cell in the spreadsheet indicates that cholesterol was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.16
   Maximum:	10.35
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   cholestanol

   concentration of the sterol cholestanol normalized to organic carbon. An empty cell in the spreadsheet indicates that cholestanol was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.12
   Maximum:	8.37
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   brassicasterol

   concentration of the sterol brassicasterol normalized to organic carbon. An empty cell in the spreadsheet indicates that brassicasterol was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.08
   Maximum:	6.75
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   campesterol

   concentration of the sterol campesterol normalized to organic carbon. An empty cell in the spreadsheet indicates that campesterol was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.10
   Maximum:	3.61
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   stigmasterol

   concentration of the sterol stigmasterol normalized to organic carbon. An empty cell in the spreadsheet indicates that stigmasterol was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.08
   Maximum:	3.46
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   β-sitosterol

   concentration of the β-sitosterol normalized to organic carbon. An empty cell in the spreadsheet indicates that β-sitosterol was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.09
   Maximum:	4.74
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   stigmastanol

   concentration of the sterol stigmastanol normalized to organic carbon. An empty cell in the spreadsheet indicates that stigmastanol was not calculated for every sample. If concentration was below detection limit then indicated by n/d. (Source: standard reporting value in organic chemistry)

   Range of values
   Minimum:	0.07
   Maximum:	2.95
   Units:	microgram per gram dry sediment normalized to organic carbon
   Resolution:	0.01

   Aluminum

   Aluminum concentration. An empty cell in the spreadsheet indicates that aluminum was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	1.00
   Maximum:	58200.00
   Units:	microgram per gram dry sediment
   Resolution:	0.01

   Phosphorous

   Phosphorous concentration. An empty cell in the spreadsheet indicates that phosphorous was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	754
   Maximum:	948
   Units:	microgram per gram dry sediment
   Resolution:	1

   Vanadiun

   Vanadiun concentration. An empty cell in the spreadsheet indicates that vanadium was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	82.30
   Maximum:	92.90
   Units:	microgram per gram dry sediment
   Resolution:	0.01

   Chromium

   Chromium concentration. An empty cell in the spreadsheet indicates that chromium was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	62.30
   Maximum:	73.60
   Units:	microgram per gram dry sediment
   Resolution:	0.01

   Manganese

   Manganese concentration. An empty cell in the spreadsheet indicates that manganese was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	62.3
   Maximum:	73.6
   Units:	microgram per gram dry sediment
   Resolution:	0.1

   Iron

   Iron concentration. An empty cell in the spreadsheet indicates that iron was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	0.92
   Maximum:	33600.00
   Units:	microgram per gram dry sediment
   Resolution:	0.01

   Copper

   Copper concentration. An empty cell in the spreadsheet indicates that copper was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	62.30
   Maximum:	73.60
   Units:	microgram per gram dry sediment
   Resolution:	0.01

   Zinc

   Zinc particulate concentration. An empty cell in the spreadsheet indicates that zinc was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	77.70
   Maximum:	109.00
   Units:	microgram per gram dry sediment
   Resolution:	0.01

   Strontium

   Strontium concentration. An empty cell in the spreadsheet indicates that strontium was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	264
   Maximum:	318
   Units:	microgram per gram dry sediment
   Resolution:	1

   Molybdenum

   Molybdenum concentration. An empty cell in the spreadsheet indicates that molybdenum was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	0.66
   Maximum:	1.80
   Units:	microgram per gram dry sediment
   Resolution:	0.01

   Cadmium

   Cadmium particulate concentration. An empty cell in the spreadsheet indicates that cadmium was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	0.10
   Maximum:	0.34
   Units:	microgram per gram dry sediment
   Resolution:	0.01

   Cesium

   Cesium particulate concentration. An empty cell in the spreadsheet indicates that cesium was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	4.20
   Maximum:	4.80
   Units:	microgram per gram dry sediment
   Resolution:	0.01

   Barium

   Barium particulate concentration. An empty cell in the spreadsheet indicates that barium was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	386
   Maximum:	475
   Units:	microgram per gram dry sediment
   Resolution:	1

   Lanthanum

   Lanthanum particulate concentration. An empty cell in the spreadsheet indicates that lanthanum was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	30.40
   Maximum:	33.80
   Units:	microgram per gram dry sediment
   Resolution:	0.01

   Thallium

   Thallium particulate concentration. An empty cell in the spreadsheet indicates that thallium was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	0.00
   Maximum:	0.53
   Units:	microgram per gram dry sediment
   Resolution:	0.01

   Lead

   Lead particulate concentration. An empty cell in the spreadsheet indicates that lead was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	23.20
   Maximum:	29.40
   Units:	microgram per gram dry sediment
   Resolution:	0.01

   Thorium

   Thorium particulate concentration. An empty cell in the spreadsheet indicates that thorium was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	8.81
   Maximum:	9.65
   Units:	microgram per gram dry sediment
   Resolution:	0.01

   Uranium

   Uranium concentration. An empty cell in the spreadsheet indicates that uranium was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	2.04
   Maximum:	2.26
   Units:	microgram per gram dry sediment
   Resolution:	0.01

   Neodymium

   Neodymium concentration. An empty cell in the spreadsheet indicates that neodymium was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	0.00
   Maximum:	0.07
   Units:	microgram per gram dry sediment
   Resolution:	0.01

   Fraction Modern

   Fraction modern is a measurement of the deviation of the delta-Carbon-14/delta-Carbon-12 ratio of a sample from modern carbon (Stuiver and Polach, 1977). An empty cell in the spreadsheet indicates that fraction modern was not calculated for every sample. (Source: defined in Stuiver and Polach (1977))

   Range of values
   Minimum:	0.8526
   Maximum:	0.8850
   Units:	unitless
   Resolution:	0.0001

   Fraction Modern (error)

   Fraction modern (error) is a measurement of the deviation of the delta-Carbon-14/delta-Carbon-12 ratio of a sample from modern carbon (Stuiver and Polach, 1977). An empty cell in the spreadsheet indicates that fraction modern (error) was not calculated for every sample. (Source: defined in Stuiver and Polach (1977))

   Range of values
   Minimum:	0.0018
   Maximum:	0.0028
   Units:	unitless
   Resolution:	0.0001

   Conventional Radiocarbon Age

   Conventional Radiocarbon Age calculated using the radiocarbon decay equation (Stuiver and Polach, 1977). An empty cell in the spreadsheet indicates that Conventional Radiocarbon Age was not calculated for every sample. (Source: defined in Stuiver and Polach (1977))

   Range of values
   Minimum:	980
   Maximum:	1280
   Units:	years
   Resolution:	1

   Conventional Radiocarbon Age (error)

   Standard error for Conventional Radiocarbon Age. An empty cell in the spreadsheet indicates that Conventional Radiocarbon Age (error) was not calculated for every sample. (Source: defined in Stuiver and Polach (1977))

   Range of values
   Minimum:	15
   Maximum:	25
   Units:	years
   Resolution:	1

   Delta-C-14

   The relative difference between the absolute international standard (base year 1950) and sample activity corrected for age and delta-Carbon-13. An empty cell in the spreadsheet indicates that Delta-Carbon-14 was not calculated for every sample. (Source: defined in Stuiver and Polach (1977))

   Range of values
   Minimum:	-153.75
   Maximum:	-121.57
   Units:	parts per thousand (per mil)
   Resolution:	0.01

   Delta-C-14 (error)

   Statistical counting error for the relative difference between the absolute international standard (base year 1950) and sample activity corrected for age and delta-Carbon-13. An empty cell in the spreadsheet indicates that Delta-Carbon-14 (error) was not calculated for every sample. (Source: defined in Stuiver and Polach (1977))

   Range of values
   Minimum:	1.80
   Maximum:	2.80
   Units:	parts per thousand (per mil)
   Resolution:	0.01

   Nitrate

   dissolved inorganic nitrate concentration. An empty cell in the spreadsheet indicates that was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	0.00
   Maximum:	22.38
   Units:	micromole per liter of seawater
   Resolution:	0.01

   Ammonia

   dissolved inorganic ammonia concentration An empty cell in the spreadsheet indicates that ammonia was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	0.00
   Maximum:	6.02
   Units:	micromole per liter of seawater
   Resolution:	0.01

   Phosphate

   dissolved inorganic phosphate concentration. An empty cell in the spreadsheet indicates that phosphate was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	0.02
   Maximum:	1.38
   Units:	micromole per liter of seawater
   Resolution:	0.01

   Silicate

   dissolved inorganic silicate concentration An empty cell in the spreadsheet indicates that silicate was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	0.00
   Maximum:	11.24
   Units:	micromole per liter of seawater
   Resolution:	0.01

   Nitrite

   dissolved inorganic nitrite concentration. An empty cell in the spreadsheet indicates that nitrite was not calculated for every sample. (Source: standard reporting value in inorganic chemistry)

   Range of values
   Minimum:	0.00
   Maximum:	1.53
   Units:	micromole per liter of seawater
   Resolution:	0.01

   Entity_and_Attribute_Overview: The first line of the csv file is a header line.
   Entity_and_Attribute_Detail_Citation: U.S. Geological Survey
   

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Nancy G. Prouty
   • Furu Mienis
   • Pamela L. Campbell
   • E. Brendan Roark
2. Who also contributed to the data set?

   A. Lam and R. Wolf (USGS) for analytical assistance, and J. Borden, O. Cheriton, and K. Rosenberger (USGS) for field assistance.

3. To whom should users address questions about the data?
   U.S. Geological Survey, Pacific Coastal and Marine Science Center

   Attn: PCMSC Science Data Coordinator

   2885 Mission Street

   Santa Cruz, CA
   

   US

   831-427-4747 (voice)

   pcmsc_data@usgs.gov

Why was the data set created?

These samples were collected and analyzed to characterize the temporal variability in source, transport, and fate of particulate matter in Baltimore Canyon.

How was the data set created?

1. From what previous works were the data drawn?

   stable carbon and nitrogen isotopes, lead-210, pigments (source 1 of 4)

   NIOZ Royal Netherlands Institute for Sea Research, 2014, bulk geochemistry (carbon, nitrogen, stable isotopes, flux, pigments).

   Type_of_Source_Media: sediment lab samples
   Source_Contribution:

   Thermo Delta V Advantage Isotope Ratio MS, Thermo Organic Elemental Analyser Flash 2000, HPLC, alpha spectrometry

   Sediment radiocarbon ages (source 2 of 4)

   National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) facility, 2014, radiocarbon measurements.

   Type_of_Source_Media: sediment lab samples
   Source_Contribution:

   Approximately 50 mg of acidified (1.2N HCl) bulk sediment was converted to carbon dioxide and graphitized for accelerator mass spectrometry (AMS; Vogel and others, 1987).

   n-alkane and sterol (source 3 of 4)

   USGS Pacific Coastal Marine Science Centers Organic Geochemistry laboratory, 2014, Molecular composition of the sediment trap analysis.

   Type_of_Source_Media: sediment lab samples
   Source_Contribution:

   Compounds (n-alkanes (F1), polycyclic aromatic hydrocarbons (PAHs) (F2), and sterols/ketones (F3) were identified by retention time of known standards in addition to mass spectral confirmation via gas chromatograph.

   Sediment trace element concentrations (source 4 of 4)

   USGS Mass Spectrometry Facilities, 2014, trace element measurements.

   Type_of_Source_Media: sediment lab samples
   Source_Contribution:

   50 to 100 mg of sediment was digested using a 4 acid procedure (HF + HCl + HNO3 + HClO4), taken to dryness, and the residue dissolved in 5 to 20 mL of 5 percent to 13 percent HNO3 with a dilution factor of 103 to 104 (Briggs and Meier, 2002).

2. How were the data generated, processed, and modified?

   Date: 24-Mar-2017 (process 1 of 4)

   Results from the all lab analyses were combined into a comma-delimited text document (BaltimoreCanyon_chemistry.csv) for this data release. Data sources used in this process:

   • All source contributions were used for this dataset

   Date: 20-Nov-2019 (process 2 of 4)

   Edits were made to correct improper values in the Attribute Measurement Resolution tags (so they reflected numbers only, no words). No data were changed. Person who carried out this activity:
   

   Susan A. Cochran

   U.S. Geological Survey, Pacific Coastal and Marine Science Center

   2885 Mission St.

   Santa Cruz, CA
   

   USA

   831-460-7545 (voice)

   scochran@usgs.gov

   Date: 19-Oct-2020 (process 3 of 4)

   Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. Person who carried out this activity:
   

   U.S. Geological Survey

   Attn: VeeAnn A. Cross

   Marine Geologist

   384 Woods Hole Road

   Woods Hole, MA
   

   508-548-8700 x2251 (voice)

   508-457-2310 (FAX)

   vatnipp@usgs.gov

   Date: 03-Nov-2020 (process 4 of 4)

   Edited metadata and header columns of csv data file to correct a typo that resulted from an encoding vs plain text problem. The data file read 5-_-coprostanone, which should be 5-β-coprostanone, and _-sitosterol, which should be β-sitosterol. The Attribute information in the metadata was corrected, as well using static point of contact information to bring it up to PCMSC standards. No data values were changed. Person who carried out this activity:
   

   Susan A. Cochran

   U.S. Geological Survey, Pacific Coastal and Marine Science Center

   2885 Mission St.

   Santa Cruz, CA
   

   USA

   831-460-7545 (voice)

   scochran@usgs.gov

3. What similar or related data should the user be aware of?
   Stuiver, M., and Polach, H.A., 1977, Discussion reporting of 14C data: Journal article Radiocarbon, v. 19, n. 3, 1977, p. 355-363, Cambridge University Press, Tucson, AZ.

   Online Links:

   • https://doi.org/10.1017/S0033822200003672

   Briggs, P.H., and Meier, A.L., 2012, The determination of forty-two elements in geological materials by inductively coupled plasma-mass spectrometry: Open-File Report 02-0223, U.S. Geological Survey, Reston, VA.

   Online Links:

   • https://pubs.usgs.gov/of/2002/ofr-02-0223/

   Vogel, J.S., Southon, J.R., and Nelson, D.E., 1987, Catalyst and binder effects in the use of filamentous graphite for AMS: Journal article Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Volume 29, Issues 1–2, 2 November 1987, Pages 50-56, Elsevier, Cambridge, MA.

   Online Links:

   • https://doi.org/10.1016/0168-583X(87)90202-3

How reliable are the data; what problems remain in the data set?

1. How well have the observations been checked?
   All geochemistry data were calibrated against known standards.
2. How accurate are the geographic locations?
   The sediment trap position was determined by the ship’s bridge GPS.
3. How accurate are the heights or depths?
   A formal accuracy assessment of the vertical positional information in the data set has not been conducted.
4. Where are the gaps in the data? What is missing?
   Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
5. How consistent are the relationships among the observations, including topology?
   No logical accuracy tests were conducted.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
Use_Constraints:

USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey and National Oceanic and Atmospheric Administration (NOAA), and Bureau of Ocean Energy Management (BOEM) in products derived from these data. Share data products developed using these data with the U.S. Geological Survey.

1. Who distributes the data set? (Distributor 1 of 1)
   
   U.S. Geological Survey - ScienceBase

   Denver Federal Center, Building 810, Mail Stop 302

   Denver, CO
   

   1-888-275-8747 (voice)

   sciencebase@usgs.gov
2. What's the catalog number I need to order this data set? These data are available in .csv format contained in a single file.
3. What legal disclaimers am I supposed to read?

   Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.

4. How can I download or order the data?
   • Availability in digital form:

     Data format:	File contains table in .csv format in format comma-delimited text (version Excel 14.3.9) .csv Size: 0.081
     Network links:	https://www.sciencebase.gov/catalog/file/get/593060d0e4b0e9bd0ea8eae6 https://doi.org/10.5066/F7NC5ZCQ

   • Cost to order the data: None.

5. What hardware or software do I need in order to use the data set?

   These data can be viewed with Microsoft Excel or any text reader

Who wrote the metadata?

Dates:

Last modified: 03-Nov-2020

Metadata author:

U.S. Geological Survey, Pacific Coastal and Marine Science Center

Attn: PCMSC Science Data Coordinator

2885 Mission Street

Santa Cruz, CA

US

831-427-4747 (voice)

pcmsc_data@usgs.gov

Metadata standard:

Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)