Gulf of Alaska Shelf and Slope Iron and Nitrate Data, Copper River Region, 2010

Identification_Information:

Citation:

Citation_Information:

Originator: John Crusius (ORCID: 0000-0003-2554-0831)
Originator: Andrew W. Schroth
Originator: Joseph A. Resing
Originator: Jay Cullen
Originator: Robert W. Campbell
Publication_Date: 2017
Title:

Geospatial_Data_Presentation_Form: spreadsheet, software
Publication_Information:

Publication_Place: Anchorage, AK
Publisher: U.S. Geological Survey

Other_Citation_Details:

Suggested citation: Crusius, J., Schroth, A.W., Resing, J.A., Cullen, J., Campbell, R.W., 2017, Gulf of Alaska Shelf and Slope Iron and Nitrate Data, Copper River Region, 2010: U.S. Geological Survey data release, https://doi.org/10.5066/F7222S06.

Online_Linkage: https://doi.org/10.5066/F7222S06
Larger_Work_Citation:

Citation_Information:

Originator: John Crusius
Publication_Date: Unknown
Title:

Climate change, melting glaciers, nutrient flux and ecosystem change: Hydrological, biogeochemical and biological linkages between the Copper River watershed and the coastal Gulf of Alaska

Geospatial_Data_Presentation_Form: website
Publication_Information:

Publication_Place: Anchorage, Alaska
Publisher: U.S. Geological Survey

Online_Linkage: https://alaska.usgs.gov/portal/project.php?project_id=317

Description:

Abstract:

These are data from cruises carried out in April, May and July 2010 from the Copper River (AK) mouth to beyond the shelf break, ~150 km from shore. The focus of the dataset is the iron (Fe) data, intended to help infer the processes controlling concentrations of Fe. The data include concentrations of total dissolvable Fe (TDFe), dissolved Fe (dFe), nitrate, and salinity, temperature and fluorescence data (CTD) as background. This also includes sea surface height deviation data for a two month interval when a Yakutat eddy passed by the sampling site. Also included is a simple 1-dimensional numerical model used to simulate the the April DFe data assuming a DFe flux from shelf sediments, horizontal transport by eddy diffusion, and removal by scavenging. Data from eight model simulations are also included.

Purpose:

The data were collected in order to understand the controls on iron and other nutrient concentrations in Gulf of Alaska surface waters to better understand controls on biological productivity in the region.

Supplemental_Information:

The C code for the 1-dimensional numerical model that simulates a dissolved Fe source from shelf sediments, horizontal mixing, and removal by chemical scavenging is included in this data package.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20100406
Ending_Date: 20100730

Currentness_Reference: ground condition

Status:

Progress: Complete
Maintenance_and_Update_Frequency: Unknown

Spatial_Domain:

Description_of_Geographic_Extent: Gulf of Alaska, Copper River
Bounding_Coordinates:

West_Bounding_Coordinate: -145.5
East_Bounding_Coordinate: -145.16884
North_Bounding_Coordinate: 60.19172
South_Bounding_Coordinate: 59.07384

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:ASC108

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: oceans

Theme:

Theme_Keyword_Thesaurus: NASA Global Change Master Directory
Theme_Keyword: nutrient cycling
Theme_Keyword: oceans
Theme_Keyword: trace elements
Theme_Keyword: suspended solids
Theme_Keyword: biogeochemical cycles

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: iron
Theme_Keyword: mathematical modeling

Place:

Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: Alaska
Place_Keyword: Gulf of Alaska
Place_Keyword: Copper River

Access_Constraints: None
Use_Constraints:

It is requested that the authors and the USGS Alaska Science Center be cited for any subsequent publications referenced to this dataset. It is strongly recommended that careful attention be paid to the contents of the metadata file associated with these data to evaluate data set limitations, restrictions or intended use.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: John Crusius
Contact_Organization: USGS Alaska Science Center at UW School of Oceanography

Contact_Address:

Address_Type: mailing and physical
Address: Box 355351; 1492 NE Boat St.
City: Seattle
State_or_Province: WA
Postal_Code: 98195
Country: USA

Contact_Voice_Telephone: 206-543-6978
Contact_Electronic_Mail_Address: jcrusius@usgs.gov

Data_Set_Credit:

USGS Coastal and Marine Geology Program; USGS National Climate Change and Wildlife Science Center;

Cross_Reference:

Citation_Information:

Originator: John Crusius
Originator: Andrew W. Schroth
Originator: Joseph A. Resing
Originator: Jay Cullen
Originator: Robert W. Campbell
Publication_Date: 2017
Title:

Seasonal and spatial variability in northern Gulf of Alaska surface-water iron concentrations driven by shelf sediment resuspension, glacial meltwater, a Yakutat eddy, and dust

Geospatial_Data_Presentation_Form: journal article
Publication_Information:

Publication_Place: Washington, D.C.
Publisher: American Geophysical Union (Global Biogeochemical Cycles)

Other_Citation_Details:

Crusius, J., A. W. Schroth, J. A. Resing, J. Cullen, and R. W. Campbell (2017), Seasonal and spatial variabilities in northern Gulf of Alaska surface water iron concentrations driven by shelf sediment resuspension, glacial meltwater, a Yakutat eddy, and dust, Global Biogeochem. Cycles, 31, 942–960, doi:10.1002/2016GB005493.

Online_Linkage: https://doi.org/10.1002/2016GB005493

Analytical_Tool:

Analytical_Tool_Description:

Sea surface height deviation data was acquired from the AVISO program through the NOAA Coastwatch ERDDAP data server (product erdTAssh1day; Ducet et al, 2000)

Tool_Access_Information:

Online_Linkage:

http://coastwatch.pfel.noaa.gov/erddap/griddap/erdTAssh1day.html

Tool_Access_Instructions: Available online.

Tool_Citation:

Citation_Information:

Originator: Ducet, N.
Originator: P.Y. Le Traon
Originator: G. Reverdin
Publication_Date: 2000
Title:

Global high resolution mapping of ocean circulation from TOPEX/Poseidon and ERS-1 and -2

Geospatial_Data_Presentation_Form: journal article
Publication_Information:

Publication_Place: online
Publisher: Journal of Geophysical Research

Other_Citation_Details: 105, 19477-19498

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

No formal attribute accuracy tests were conducted. Various calibrations were carried out for the S, Fe and nitrate data.

Logical_Consistency_Report:

The data included are from a journal article in the AGU journal Global Biogeochemical Cycles which has undergone thorough peer review.

Completeness_Report:

Data set 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.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report: No formal positional accuracy tests were conducted

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Ducet, N.
Originator: P.Y. Le Traon
Originator: G. Reverdin
Publication_Date: 2000
Title:

Global high resolution mapping of ocean circulation from TOPEX/Poseidon and ERS-1 and -2

Geospatial_Data_Presentation_Form: journal article
Publication_Information:

Publication_Place: online
Publisher: Journal of Geophysical Research

Other_Citation_Details: 105, 19477-19498

Type_of_Source_Media: online tool
Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20100331
Ending_Date: 20100602

Source_Currentness_Reference: observed

Source_Citation_Abbreviation: Ducet et al, 2000
Source_Contribution:

Sea surface height deviation data was acquired from the AVISO program through the NOAA Coastwatch ERDDAP data server (product erdTAssh1day; Ducet et al, 2000)

Process_Step:

Process_Description:

All Temperature, Salinity and Fluorescence data were determined from the factory calibration of the Seabird CTD.

Process_Date: 2010

Process_Step:

Process_Description:

All dissolved Fe (DFe) data were determined by Flow Injection Analysis in the lab of Jay Cullen at the University of Victoria using the method of Obata et al, 1993. DFe concentrations were compared to the reference materials SAFe D1 (bottle number 254 of ~650 total) and SAFe D2. We measured a concentration of 0.57±0.06 nmol kg-1 for SAFe D1, which agreed with the consensus values of 0.65±0.1 that included lower concentrations among higher bottle numbers. For SAFe sample D2 we measured a concentration of 0.96±0.04 nmol kg-1, very close to the consensus value of 0.923±0.029 nmol kg-1. (http://www.geotraces.org/sic/intercalibrate-a-lab/standards-and-reference-materials ).

Obata, H., H. Karatani, and E. Nakayama (1993), AUTOMATED-DETERMINATION OF IRON IN SEAWATER BY CHELATING RESIN CONCENTRATION AND CHEMILUMINESCENCE DETECTION, Analytical Chemistry, 65(11), 1524-1528, doi:10.1021/ac00059a007.

Process_Date: 2014

Process_Step:

Process_Description:

Total dissolved Fe (TDFe) data were determined by two methods. Roughly half were determined by Flow Injection Analysis in the lab of Joseph Resing of UW/JISAO/NOAA/PMEL using the method of Measures et al (1995). The rest were determined at the Woods Hole Oceanographic Institution by HR-ICP-MS (Thermo Fisher Element 2) in medium-resolution mode following 20-fold or greater dilution, with Sc as an internal standard, and using NRC-Canada’s SLRS-4 as a reference material. 40 samples measured by each method agreed within 10%.

Measures, C. I., J. Yuan, and J. A. Resing (1995), Determination of iron in seawater by flow injection analysis using in-line preconcentration and spectrophotometric detection, Mar. Chem., 50, 3-12.

Process_Date: 2014

Process_Step:

Process_Description:

Nitrate+nitrite concentrations were measured using the spectrophotometric method of Jones (1984) and were determined prior to and after the cadmium reduction step to account for nitrite in the samples. Absorbances were measured with a Varian CARY 50 spectrophotometer at 540 nm.

Jones, M. N. (1984), Nitrate reduction by shaking with cadmium: Alternative to cadmium columns, Wat. Res., 18, 643-646.

Process_Date: 2010

Process_Step:

Process_Description:

Sea surface height deviation (SSHD) data were acquired from the AVISO program through the NOAA Coastwatch ERDDAP data server (product erdTAssh1day; Ducet et al, 2000).

Ducet, N., P.-Y. Le Traon, and G. Reverdin, 2000. Global high resolution mapping of ocean circulation from TOPEX/Poseidon and ERS-1 and -2. J. Geophys. Res., 105, 19477-19498.

Process_Date: 2016

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference: Gulf of Alaska Shelf and Slope
Direct_Spatial_Reference_Method: Point

Spatial_Reference_Information:

Vertical_Coordinate_System_Definition:

Depth_System_Definition:

Depth_Datum_Name: Local surface
Depth_Resolution: 1.0
Depth_Distance_Units: meters
Depth_Encoding_Method: Attribute values

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label:

CTD data - cr2010-01-001-005, cr2010-02-001-005, cr2010-004-000-005

Entity_Type_Definition:

Conductivity temperature depth (CTD) data collected using SBE25/SBE19Plus at 5 stations in the Gulf of Alaska in April, May and July 2010. Each of these files has a CSV with data and a corresponding TXT file with its parameter settings.

Entity_Type_Definition_Source: Producer defined

Attribute:

Attribute_Label: Depth
Attribute_Definition:

The depth below nominal sea surface (m) from which the water sample was collected.

Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.5
Range_Domain_Maximum: 310
Attribute_Units_of_Measure: meters (m)

Attribute:

Attribute_Label: Temp
Attribute_Definition: The temperature of the water.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 3
Range_Domain_Maximum: 13
Attribute_Units_of_Measure: degrees centigrade

Attribute:

Attribute_Label: Fluorescence
Attribute_Definition: The measured fluorescence of the water sample using the CTD.
Attribute_Definition_Source: Seabird calibration defined.
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -0.1324
Range_Domain_Maximum: 10.3933
Attribute_Units_of_Measure:

mg/m3 chl-a (defined by the factory calibration from Seabird, the company that manufactured the CTD).

Attribute:

Attribute_Label: Salinity
Attribute_Definition: Salinity of the water sample (practical salinity units)
Attribute_Definition_Source:

Unesco (http://unesdoc.unesco.org/images/0018/001881/188170e.pdf)

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1.0332
Range_Domain_Maximum: 35.2155
Attribute_Units_of_Measure: practical salinity units

Detailed_Description:

Entity_Type:

Entity_Type_Label: SedmixToFeMix2016_11_03Clean.c
Entity_Type_Definition:

1-dimensional numerical model that simulates a dissolved Fe source from shelf sediments, horizontal mixing, removal by chemical scavenging, written in the C programming language.

Entity_Type_Definition_Source: Producer defined

Detailed_Description:

Entity_Type:

Entity_Type_Label:

Numerical model runs - FeTest135, FeTest 137, FeTest139, FeTest140-142, FeTest144-145

Entity_Type_Definition:

Model simulations using the 1-D Fe source, mixing, and scavenging model. Each of these files has a CSV with data and a corresponding TXT file with its parameter settings.

Entity_Type_Definition_Source: Producer defined.

Attribute:

Attribute_Label: Distance
Attribute_Definition: Distance from the coastline in kilometers.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.25
Range_Domain_Maximum: 1199.25
Attribute_Units_of_Measure: kilometers

Attribute:

Attribute_Label: DFe_conc
Attribute_Definition:

Concentration of dissolved Iron (Fe) (nmole/kg seawater) in simulated surface water.

Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.000001
Range_Domain_Maximum: 3.4
Attribute_Units_of_Measure: nmole Fe per kilogram of seawater

Attribute:

Attribute_Label: dmx
Attribute_Definition:

Horizontal mixing term in km2/d, as in equation below. r1[i] = r10 * exp(-ar1 * i * z); /* now r1 in m2/s, attenuation terms allows for decreasing mixing offshore */ r2[i] = r20 ; dmx1[i] = r1[i] * 1.0E-6 * 86400; /* dmx1 converts r1 to km2/d */ dmx2[i] = r2[i] * 1.0E-6 * 86400; /* dmx2 converts r2 to km2/d */

Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 15.552
Range_Domain_Maximum: 31.104
Attribute_Units_of_Measure: km2/d

Attribute:

Attribute_Label: df
Attribute_Definition: Diffusion coefficient, set to zero as intended.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 0
Attribute_Units_of_Measure: integer

Attribute:

Attribute_Label: dtot
Attribute_Definition:

a “total” mixing term, equal to dmx as intended when df = zero, as in equations below. df1[i] = dm * 31.5 / (1 + Kd[i] * rs) ; /*dm is zero...so df1,df2 terms zero */ df2[i] = dm * 31.5 / (1 + Kd[i] * rs) ; /*dm is zero...so df1,df2 terms zero */ /* (31.5 cm^2/yr)/(10E-6 cm^2/sec) in line above */ dtot1[i] = dmx1[i] + df1[i]; dtot2[i] = dmx2[i] + df2[i];

Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 15.552
Range_Domain_Maximum: 31.104
Attribute_Units_of_Measure: decimal

Attribute:

Attribute_Label: adv1
Attribute_Definition: In km/d horizontal advection (converts s from cm/s)
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.000043
Range_Domain_Maximum: 0.000043
Attribute_Units_of_Measure: km/d

Attribute:

Attribute_Label: dflux
Attribute_Definition:

Dust flux on continental shelf, attenuated by distance from shore according to equations below. dflux2 = dust flux beyond shelf, attenuated by distance from shore, according to equations below. dflux1[i] = dust * exp(-ad1 * i * z); /* dflux1 is dust flux on shelf, attenuated by distance from shore */ dflux2[i] = dust * exp(-ad2 * (i-n) * z); /* dflux2 is dust flux beyond shelf, attenuated by distance from shore */

Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 0.3
Attribute_Units_of_Measure: nmol totFe/m2/d

Detailed_Description:

Entity_Type:

Entity_Type_Label: GoA_CR_shelf_2010SurfS,T,Fe,NO3.csv
Entity_Type_Definition:

Surface samples containing iron, nitrate and salinity data. Sample was pumped with surface towfish through Teflon-lined tubing. Yellow Springs Instrument (YSI) was used in the collection effort. Samples were collected from the Copper River mouth to Station 5 April, May and July 2010.

Entity_Type_Definition_Source: Producer defined

Attribute:

Attribute_Label: Long
Attribute_Definition: Longitude where the sample was collected.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -146.368973
Range_Domain_Maximum: -144.92607
Attribute_Units_of_Measure: degrees

Attribute:

Attribute_Label: Lat
Attribute_Definition: Latitude where the sample was collected.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 59.078899
Range_Domain_Maximum: 60.209831
Attribute_Units_of_Measure: degrees

Attribute:

Attribute_Label: DateTime
Attribute_Definition:

The date and time when the sample was collected, in format YYYYMMDDHHMMSSZ, UTC time.

Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 20100400000000
Range_Domain_Maximum: 20100700000000
Attribute_Units_of_Measure: UTC

Attribute:

Attribute_Label: YSI_Depth
Attribute_Definition:

The depth below nominal sea surface (m) from which the water sample was collected.

Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.515
Range_Domain_Maximum: 2.732
Attribute_Units_of_Measure: meters (m)

Attribute:

Attribute_Label: Surface_Salinity
Attribute_Definition: Salinity of the water sample (practical salinity units)
Attribute_Definition_Source:

Unesco (http://unesdoc.unesco.org/images/0018/001881/188170e.pdf)

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 21.02701687
Range_Domain_Maximum: 32.23
Attribute_Units_of_Measure: practical salinity units

Attribute:

Attribute_Label: Distance_from_Shore
Attribute_Definition: The distance from the Copper River mouth in km.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 2.895509672
Range_Domain_Maximum: 127.6151586
Attribute_Units_of_Measure: kilometers (km)

Attribute:

Attribute_Label: TDFe
Attribute_Definition:

The concentration of iron in an unfiltered seawater sample acidified to pH=1.7.

Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1.369377155
Range_Domain_Maximum: 49461.55128
Attribute_Units_of_Measure: nmoles Fe per kilogram of water (nmol Fe/kg)

Attribute:

Attribute_Label: Diss_Fe
Attribute_Definition:

Dissolved Fe (passes through a 0.45 um filter) concentration in the water (pH=1.7).

Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.61
Range_Domain_Maximum: 9.64
Attribute_Units_of_Measure: nmoles Fe per kilogram of water (nmol Fe/kg)

Attribute:

Attribute_Label: Diss_NO3
Attribute_Definition: dissolved nitrate concentration
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 18.40752351
Attribute_Units_of_Measure: micromole per kilogram of water (umol/kg)

Attribute:

Attribute_Label: Notes
Attribute_Definition: Written notes, misc.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Unrepresentable_Domain: Free-format text

Detailed_Description:

Entity_Type:

Entity_Type_Label: erdTAssh1day_edff_1578_9fb9.csv
Entity_Type_Definition:

North Gulf of sea surface height data for March 31 - June 2, 2010 acquired from the AVISO program, NOAA Coastwatch ERDDAP data server.

Entity_Type_Definition_Source: Producer defined

Attribute:

Attribute_Label: Latitude
Attribute_Definition: Latitude
Attribute_Definition_Source: GPS
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 58
Range_Domain_Maximum: 60.5
Attribute_Units_of_Measure: degrees north

Attribute:

Attribute_Label: Longitude
Attribute_Definition: Longitude
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 213
Range_Domain_Maximum: 217
Attribute_Units_of_Measure: degrees east

Attribute:

Attribute_Label: DateTime
Attribute_Definition: The date and time when the sample was collected, in UTC time.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 2010-03-31T12:00:00Z
Range_Domain_Maximum: 2010-06-02T12:00:00Z
Attribute_Units_of_Measure: UTC (YYYYMMDDHHMMSSZ)

Attribute:

Attribute_Label: SSH
Attribute_Definition: sea surface height
Attribute_Definition_Source:

AVISO program through the NOAA Coastwatch ERDDAP data server (product erdTAssh1day; Ducet et al, 2000); Ducet, N., P.-Y. Le Traon, and G. Reverdin, 2000. Global high resolution mapping of ocean circulation from TOPEX/Poseidon and ERS-1 and -2. J. Geophys. Res., 105, 19477-19498.

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.10998
Range_Domain_Maximum: 0.680391
Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: SSHD
Attribute_Definition: sea surface height deviation
Attribute_Definition_Source:

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -0.107892
Range_Domain_Maximum: 0.351028
Attribute_Units_of_Measure: meters

Detailed_Description:

Entity_Type:

Entity_Type_Label: allCRPdataNitrateTDFe_2010GBC2017.csv
Entity_Type_Definition:

Gulf of Alaska depth profiles collected using Teflon-coated Niskin bottles (8L) in April, May and July 2010.

Entity_Type_Definition_Source: Producer defined

Attribute:

Attribute_Label: Cruise#
Attribute_Definition:

The number assigned to each of the 2010 research cruises, occasionally used to distinguish data.

Attribute_Definition_Source: Producer defined.
Attribute_Domain_Values:

Unrepresentable_Domain: CRP2010-01 to CRP2010-04

Attribute:

Attribute_Label: Station
Attribute_Definition:

The station number we assigned to the locations where we collected depth profiles, from 1 (nearshore) to 5 (offshore).

Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1
Range_Domain_Maximum: 5
Attribute_Units_of_Measure: integer

Attribute:

Attribute_Label: Depth
Attribute_Definition:

The depth below nominal sea surface (m) from which the water sample was collected. Everything labeled "surface" was converted to 2 m.

Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1
Range_Domain_Maximum: 305
Attribute_Units_of_Measure: meters (m)

Attribute:

Attribute_Label: DateTime
Attribute_Definition: The date and time when the sample was collected, in UTC time.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 20100406000000
Range_Domain_Maximum: 20100730000000
Attribute_Units_of_Measure: UTC YYYYMMDDHHMMSS

Attribute:

Attribute_Label: Latitude
Attribute_Definition: Latitude
Attribute_Definition_Source: GPS
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 59.07
Range_Domain_Maximum: 60.2
Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: Longitude
Attribute_Definition: Longitude
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -145.2
Range_Domain_Maximum: -144.92
Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: Cruise_Notes
Attribute_Definition: Notes written during the cruise.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Unrepresentable_Domain: Free formal text

Attribute:

Attribute_Label: AveCorrd_NO3
Attribute_Definition: dissolved nitrate concentration
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 42.20434673
Attribute_Units_of_Measure: micromole per kilogram of water (umol/kg)

Attribute:

Attribute_Label: TDFe
Attribute_Definition:

The concentration of iron in an unfiltered seawater sample acidified to pH=1.7.

Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 3.917
Range_Domain_Maximum: 6561.899
Attribute_Units_of_Measure: nmoles Fe per kilogram of water (nmol Fe/kg)

Attribute:

Attribute_Label: Assay_Notes
Attribute_Definition: Notes written during the analysis.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Unrepresentable_Domain: Free formal text

Gulf of Alaska Shelf and Slope Iron and Nitrate Data, Copper River Region, 2010

Metadata: