Water and algal chemistry measurements collected from the National Park Service's National Park of American Samoa (NPS-NPSA) Ofu Island unit

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Metadata:

Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Spatial_Reference_Information
Entity_and_Attribute_Information
Distribution_Information
Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Nancy G. Prouty
Publication_Date: 20250717
Title:

Water and algal chemistry measurements collected from the National Park Service's National Park of American Samoa (NPS-NPSA) Ofu Island unit

Geospatial_Data_Presentation_Form: comma-delimited text
Series_Information:

Series_Name: data release
Issue_Identification: DOI: 10.5066/P1DVZPUV

Publication_Information:

Publication_Place:

Pacific Coastal and Marine Science Center, Santa Cruz, California

Publisher: U.S. Geological Survey

Other_Citation_Details:

Suggested Citation: Prouty, N.G., 2025, Water and algal chemistry measurements collected from the National Park Service's National Park of American Samoa (NPS-NPSA) Ofu Island unit: U.S. Geological Survey data release, https://doi.org/10.5066/P1DVZPUV.

Online_Linkage: https://doi.org/10.5066/P1DVZPUV

Description:

Abstract:

Geochemical analysis of coastal springs and possible source waters were conducted in the National Park Service's National Park of American Samoa (NPS-NPSA) Ofu Island unit. Water samples were analyzed for dissolved nutrients, nitrate isotopes (delta-18-O and delta-15-N). Algae samples were collected and analyzed for delta-15-N and delta-13-C values.

Purpose:

These samples were collected and analyzed as part of an effort to characterize the spatiotemporal variability of nutrient-enriched submarine groundwater (SGD) in NPSA. This project focused on identifying and quantifying the composition and fluxes of submarine groundwater discharged onto the reef. These results will inform help NPS-NPSA staff and local government to direct remediation actions related to outbreak of Valonia fastigiata algae.

Supplemental_Information:

Additional information about the field activity or activities from which these data were derived is available online at: http://cmgds.marine.usgs.gov/fan_info.php?fan=2020-601-FA http://cmgds.marine.usgs.gov/fan_info.php?fan=2020-620-FA http://cmgds.marine.usgs.gov/fan_info.php?fan=2020-670-FA Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20190705
Ending_Date: 20200209

Currentness_Reference: Ground condition at time data were collected.

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -169.6767950
East_Bounding_Coordinate: -169.6216050
North_Bounding_Coordinate: -14.1850000
South_Bounding_Coordinate: -14.1715070

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: oceans
Theme_Keyword: environment
Theme_Keyword: geoscientificInformation

Theme:

Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: Water-Quality Parameters

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: geochemistry
Theme_Keyword: light stable isotope analysis
Theme_Keyword: chemical analysis

Theme:

Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: coral reefs

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Hazards and Resources Program
Theme_Keyword: CMHRP
Theme_Keyword: Pacific Coastal and Marine Science Center
Theme_Keyword: PCMSC
Theme_Keyword: nutrients

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:67cf4de3d34ecfe34cc86a5b

Place:

Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: Pacific Ocean
Place_Keyword: Ofu Island
Place_Keyword: Territory of American Samoa

Place:

Place_Keyword_Thesaurus: NGA GEOnet Names Server (GNS)
Place_Keyword: Papaloloa
Place_Keyword: Fattuana

Access_Constraints: No access constraints
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 the National Park Service (NPS) as the originators of the dataset and in products derived from these data.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

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

Contact_Person: PCMSC Science Data Coordinator

Contact_Address:

Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060

Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov

Data_Set_Credit:

Brendan Roark (Texas A&M) and Danielle Hull (University of Hawaii) completed the stable isotope analysis and nutrient analysis, respectively.

Native_Data_Set_Environment: Mac OS 11.4, Microsoft Excel 16.52 for Mac.
Cross_Reference:

Citation_Information:

Originator: D.M. Sigman
Originator: K.L. Casciotti
Originator: M. Andreani
Originator: C. Barford
Originator: M. Galanter
Originator: J.K. Bohlke
Publication_Date: 2001
Title:

A bacterial method for the nitrogen isotopic analysis of nitrate in seawater and freshwater

Online_Linkage: http://pubs.acs.org/doi/pdf/10.1021/ac010088e

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report: All geochemistry data were calibrated against known standards

Logical_Consistency_Report: No formal logical accuracy tests were conducted.
Completeness_Report:

Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the metadata for each part of this data release carefully for additional details. Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the metadata for each part of this data release carefully for additional details.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

A formal accuracy assessment of the horizontal positional information in the data set has not been conducted. The horizontal accuracy is based on hand-held Garmin GPS. Horizontal accuracy is approximately 3 meters.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

A formal accuracy assessment of the vertical positional information in the data set has not been conducted.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: University of California, Davis Stable Isotope Facility
Publication_Date: 2020
Title: nitrate stable nitrogen isotope analysis

Type_of_Source_Media: seawater lab samples
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20200913

Source_Currentness_Reference: Date when lab analyses were completed

Source_Citation_Abbreviation: Nitrate delta-N-15 and delta-O-18
Source_Contribution:

Denitrifier method of Sigman and others, (2001) using a Thermo Finnigan MAT 252 coupled with a GasBench II interface, isotope values are presented in per mil with respect to AIR for delta-N-15 and VSMO for delta-O-18

Source_Information:

Source_Citation:

Citation_Information:

Originator:

University of Hawaii, School of Ocean and Earth Science and Technology (SOEST)

Publication_Date: 2020
Title: nutrient analysis
Online_Linkage: http://www.soest.hawaii.edu/S-LAB/slab_prices.htm

Type_of_Source_Media: water lab samples
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20200408

Source_Currentness_Reference: Date when lab analyses were completed

Source_Citation_Abbreviation: nutrient analysis
Source_Contribution:

Nutrient autoanalyzer for analysis for dissolved nutrient (nitrate, ammonia, phosphate, and silicate) concentrations.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Texas A&M University
Publication_Date: 2020
Title: nutrient analysis
Online_Linkage: http:// stableisotope.tamu.edu

Type_of_Source_Media: algae lab samples
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20200723

Source_Currentness_Reference: Date when lab analyses were completed

Source_Citation_Abbreviation: Stable isotope analysis
Source_Contribution:

Nitrogen (delta-N-15) and Carbon (delta-C-13) analysis on algae samples.

Process_Step:

Process_Description:

Discrete water sampling included pumping from coastal springs at low tide and a groundwater well, marsh, and cesspool using a peristaltic pump with an in-line 0.45-micron filter and grab samples from the nearshore and reef flat by filtering with a 0.20-mircron syringe filter and storing frozen until analysis. Water samples were analyzed by several different labs (see Sources) for different variables. Data from all lab analyses were combined into a single document. -9999 cell value indicates no data (for example, where water sample was not analyzed for a particular variable given sample volume limitations). Algae samples were collected by snorkel, stored frozen, freeze dried at the lab, and homogenized prior to lab analysis for delta-N-15 and delta-C-13.

Source_Used_Citation_Abbreviation: nutrient analysis
Source_Used_Citation_Abbreviation: Nitrate delta-N-15 and delta-O-18
Source_Used_Citation_Abbreviation: Stable isotope analysis
Process_Date: 2020
Source_Produced_Citation_Abbreviation: lab data

Process_Step:

Process_Description:

Water and algae data were combined into a single document (Ofu_water_algal_chemistry.csv).

Source_Used_Citation_Abbreviation: lab data
Process_Date: 2020

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Point
Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 112

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.00000001
Longitude_Resolution: 0.0000001
Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: D_WGS_1984
Ellipsoid_Name: D_WGS_1984
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257224

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: Ofu_water_algal_chemistry.csv
Entity_Type_Definition: Output from chemical analysis of water and algae samples
Entity_Type_Definition_Source: Producer defined.

Attribute:

Attribute_Label: Sample ID
Attribute_Definition:

Sample identification of sampled based on location (Ofu), site (CS=coastal spring, CP=cesspool, WL=well, MS=marsh, FR=forereef) or sample type (algae), sequential number and year of collection.

Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Unrepresentable_Domain: List of station names

Attribute:

Attribute_Label: Date
Attribute_Definition: Sample collection date
Attribute_Definition_Source: Producer defined.
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 2019-07-05
Range_Domain_Maximum: 2020-02-09
Attribute_Units_of_Measure: YYYY-MM-DD

Attribute:

Attribute_Label: Time
Attribute_Definition:

Sample collection time (GMT-11). Values of -9999 indicate the parameter was not measured.

Attribute_Definition_Source: Producer defined.
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 7:26
Range_Domain_Maximum: 19:15
Attribute_Units_of_Measure: Hour:minutes

Attribute:

Attribute_Label: Latitude
Attribute_Definition: Latitude of sample location
Attribute_Definition_Source: Producer defined.
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -14.18533201
Range_Domain_Maximum: -14.17150700
Attribute_Units_of_Measure: decimal degrees
Attribute_Measurement_Resolution: 0.00000001

Attribute:

Attribute_Label: Longitude
Attribute_Definition: Longitude of sample location
Attribute_Definition_Source: Producer defined.
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -169.6767950
Range_Domain_Maximum: -169.6216050
Attribute_Units_of_Measure: decimal degrees
Attribute_Measurement_Resolution: 0.000001

Attribute:

Attribute_Label: Salinity
Attribute_Definition:

Measured salinity of water sample. Values of -9999 indicate the parameter was not measured.

Attribute_Definition_Source: Producer defined.
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.1
Range_Domain_Maximum: 35.0
Attribute_Units_of_Measure: parts per thousand
Attribute_Measurement_Resolution: 0.1

Attribute:

Attribute_Label: Temperature
Attribute_Definition:

Measured temperature of water sample. Values of -9999 indicate the parameter was not measured.

Attribute_Definition_Source: Producer defined.
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 25.5
Range_Domain_Maximum: 29.4
Attribute_Units_of_Measure: degrees Celsius
Attribute_Measurement_Resolution: 0.1

Attribute:

Attribute_Label: Phosphate
Attribute_Definition:

Dissolved inorganic phosphate concentration. Values of -9999 indicate the parameter was not measured.

Attribute_Definition_Source: standard reporting value in inorganic chemistry
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.16
Range_Domain_Maximum: 340.18
Attribute_Units_of_Measure: micromole per liter of seawater
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: Silicate
Attribute_Definition:

Dissolved inorganic silicate concentration. Values of -9999 indicate the parameter was not measured

Attribute_Definition_Source: standard reporting value in inorganic chemistry
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.91
Range_Domain_Maximum: 1203.85
Attribute_Units_of_Measure: micromole per liter of seawater
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: Nitrate and nitrite
Attribute_Definition:

Dissolved inorganic nitrate and nitrite concentration. Values of -9999 indicate the parameter was not measured

Attribute_Definition_Source: standard reporting value in inorganic chemistry
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.37
Range_Domain_Maximum: 52.83
Attribute_Units_of_Measure: micromole per liter of seawater
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: Ammonium
Attribute_Definition:

Dissolved inorganic Ammonium concentration. Values of -9999 indicate the parameter was not measured. Values of -8888 indicate that the compound was not detected.

Attribute_Definition_Source: standard reporting value in inorganic chemistry.
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.02
Range_Domain_Maximum: 2783.34
Attribute_Units_of_Measure: micromole per liter of seawater
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: delta-N-15
Attribute_Definition:

delta-N-15 is a measure of the ratio of stable isotopes Nitrogen-15:Nitrogen-14, reported in parts per thousand (per mil). Values of -9999 indicate the parameter was not measured.

Attribute_Definition_Source: standard reporting value in inorganic chemistry.
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -9.75
Range_Domain_Maximum: 9.77
Attribute_Units_of_Measure: per mil
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: delta-O-18
Attribute_Definition:

delta-O-18 is a measure of the ratio of stable isotopes Oxygen-18:Oxygen-16 in water, reported in parts per thousand (per mil). Values of -9999 indicate the parameter was not measured.

Attribute_Definition_Source: Producer defined.
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -1.79
Range_Domain_Maximum: 4.84
Attribute_Units_of_Measure: per mil

Attribute:

Attribute_Label: Percent organic nitrogen
Attribute_Definition:

Percentage by weight (wt percent) of organic nitrogen; values of -9999 indicate the parameter was not measured.

Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.68
Range_Domain_Maximum: 2.77
Attribute_Units_of_Measure: percent weight
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: delta-C-13
Attribute_Definition:

delta-C-13 is a measure of the ratio of stable isotopes Carbon-13:Carbon-12 in water, reported in parts per thousand (per mil). Values of -9999 indicate the parameter was not measured.

Attribute_Definition_Source: Producer defined.
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -20.95
Range_Domain_Maximum: -5.18
Attribute_Units_of_Measure: per mil

Attribute:

Attribute_Label: Percent organic carbon
Attribute_Definition:

Percentage by weight (wt percent) of organic carbon; values of -9999 indicate the parameter was not measured.

Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 5.52
Range_Domain_Maximum: 10.59
Attribute_Units_of_Measure: percent weight
Attribute_Measurement_Resolution: 0.01

Overview_Description:

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

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey - ScienceBase

Contact_Address:

Address_Type: mailing and physical
Address: Denver Federal Center, Building 810, Mail Stop 302
City: Denver
State_or_Province: CO
Postal_Code: 80225

Contact_Voice_Telephone: 1-888-275-8747
Contact_Electronic_Mail_Address: sciencebase@usgs.gov

Resource_Description:

These data are available in a comma-delimited text file (Ofu_water_algal_chemistry.csv) which contains water and algae analysis.

Distribution_Liability:

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.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: comma-separated text
Format_Version_Number: 16.52
Format_Information_Content: comma-delimited text
File_Decompression_Technique: none
Transfer_Size: 0.03702

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

https://www.sciencebase.gov/catalog/file/get/67cf4de3d34ecfe34cc86a5b

Network_Resource_Name: https://doi.org/10.5066/P1DVZPUV

Access_Instructions:

Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the zipped file of data and metadata. The second link points to the landing page for the entire data release.

Fees: None.

Technical_Prerequisites: These data can be viewed with any text editor software.

Metadata_Reference_Information:

Metadata_Date: 20250717
Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

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

Contact_Person: PCMSC Science Data Coordinator

Contact_Address:

Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060

Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov

Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/ScienceBase/DR_P1DVZPUV/Ofu_water_algal_chemistry_metadata.html>