Sediment porewater nutrient data from the Escanaba Trough, off the coast of Northern California, USA, from May-June 2022.

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Frequently anticipated questions:

What does this data set describe?

Title:
Sediment porewater nutrient data from the Escanaba Trough, off the coast of Northern California, USA, from May-June 2022.
Abstract:
Nutrients were measured from porewaters of sediment within the Escanaba Trough, a hydrothermal spreading center. Location information (latitude, longitude, and depth) is also reported.
Supplemental_Information:
Additional information about the field activity or activities from which these data were derived is available online at:
https:// https://cmgds.marine.usgs.gov/fan_info.php?fan=2022-621-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Escanaba Trough: Exploring the Seafloor and Oceanic Footprints is an interagency effort involving the National Oceanic and Atmospheric Administration, the U.S. Geological Survey, and the Bureau of Ocean Energy Management. Funding is acknowledged from NOAA Ocean Exploration via its Ocean Exploration Fiscal Year 2019 Funding Opportunity and through the National Oceanographic Partnership Program (NOPP), from the USGS Coastal and Marine Hazards and Resources Enhanced Funding Opportunities, and from the Bureau of Ocean Energy Management through Interagency Agreement M19PG00021 with the United States Geological Survey.
  1. How might this data set be cited?
    Ianiri, Hope L., Adamczyk, Katlin B., Favela, Jaycee J., Gartman, Amy, and Prouty, Nancy G., 20250218, Sediment porewater nutrient data from the Escanaba Trough, off the coast of Northern California, USA, from May-June 2022.: data release DOI:10.5066/P13XVXQC, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Ianiri, Hope L., Prouty, Nancy G., Campbell, Pamela L., Gartman, Amy, Adamczyk, Katlin B., and Favela, Jaycee J., 2025, Sedimentary organic geochemistry data from Escanaba Trough, off the coast of northern California, collected May-June 2022.: data release DOI:10.5066/P13XVXQC, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

    Other_Citation_Details:
    Suggested Citation: Ianiri, H.L., Campbell, P.L., Gartman, A., Prouty, N.G., Adamczyk, K.B., and Favela, J.J., 2025, Sedimentary organic geochemistry data from Escanaba Trough, off the coast of northern California, collected May-June 2022: U.S. Geological Survey data release, https://doi.org/10.5066/P13XVXQC.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -127.53618710
    East_Bounding_Coordinate: -127.44714953
    North_Bounding_Coordinate: 41.08223904
    South_Bounding_Coordinate: 40.69569198
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 31-May-2022
    Ending_Date: 11-Jun-2022
    Currentness_Reference:
    Ground condition at time samples 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 (241)
    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 0.00000001. Longitudes are given to the nearest 0.0000001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS84.
      The semi-major axis of the ellipsoid used is 6378137.0000.
      The flattening of the ellipsoid used is 1/298.2572.
  7. How does the data set describe geographic features?
    EscanabaTrough_nutrients.csv
    Table of nutrient data. (Source: producer defined)
    Cruise_ID
    Lists the alphanumeric cruise identifier for the expedition during which the sample was collected. (Source: producer defined)
    ValueDefinition
    TN403Cruise identification affiliated with Field Activity 2022-621-FA
    Sample_ID
    Name of sample (Source: producer defined) The sample names include a dive number (J2, denoting Jason2, followed by a number) and push core number (PC, denoting push core, followed by a number) and the sediment depth horizon (X-Y).
    Latitude
    Latitude of sample in decimal degrees (Source: producer defined)
    Range of values
    Minimum:40.69569198
    Maximum:41.08223904
    Units:decimal degrees
    Resolution:0.00000001
    Longitude
    Longitude of sample in decimal degrees (Source: producer defined)
    Range of values
    Minimum:-127.5361871
    Maximum:-127.4471495
    Units:decimal degrees
    Resolution:0.0000001
    Water_depth_m
    Water depth in meters at which the sample was collected. (Source: producer defined)
    Range of values
    Minimum:3222
    Maximum:3290
    Units:meters
    Resolution:1
    Location
    Location where the sample was collected (Source: producer defined)
    ValueDefinition
    Central HillText descriptor of sampling site as defined in the literature
    Edifice Rex WestText descriptor of sampling site as defined in the literature
    Edifice Rex EastText descriptor of sampling site as defined in the literature
    SESCA S3AText descriptor of sampling site as defined in the literature
    SESCA Waypoint 2 S2AText descriptor of sampling site as defined in the literature
    SESCA Unnamed & North HillText descriptor of sampling site as defined in the literature
    MESCAText descriptor of sampling site as defined in the literature
    sediment_depth_top_cm
    top depth of core subsample. Ex: a sediment core slice from 0-1 cm would have a top depth of 0 centimeters and a bottom depth of 1 centimeter. (Source: producer defined)
    Range of values
    Minimum:0.0
    Maximum:24.5
    Units:centimeters
    Resolution:0.1
    sediment_depth_bottom_cm
    bottom depth of core subsample. Ex: a sediment core slice from 0-1 cm would have a top depth of 0 centimeters and a bottom depth of 1 centimeter. (Source: producer defined)
    Range of values
    Minimum:1
    Maximum:22
    Units:centimeters
    Resolution:1
    P04_uM
    concentration of phosphate in pore waters. A value of -8888 indicates concentration was below detection limit. (Source: producer defined)
    Range of values
    Minimum:0.3
    Maximum:22.0
    Units:micromolar
    Resolution:0.1
    Si_OH4_uM
    concentration of silicic acid in pore waters (Source: producer defined)
    Range of values
    Minimum:131
    Maximum:595
    Units:micromolar
    Resolution:1.0
    NO2_uM
    concentration of nitrite in pore waters. A value of -9999 indicates concentration was not determined and a value of -8888 indicates concentration was below detection limit. (Source: producer defined)
    Range of values
    Minimum:0.1
    Maximum:21.9
    Units:micromolar
    Resolution:0.1
    NO2_plus_NO3_uM
    concentration of nitrite and nitrate in pore waters. A value of -9999 indicates concentration was not determined and a value of -8888 indicates concentration was below detection limit. (Source: producer defined)
    Range of values
    Minimum:0.4
    Maximum:58.8
    Units:micromolar
    Resolution:0.1
    NH4_uM
    concentration of ammonium in pore waters. A value of -8888 indicates concentration was below detection limit. (Source: producer defined)
    Range of values
    Minimum:0.2
    Maximum:2121.0
    Units:micromolar
    Resolution:0.1
    NO3_uM
    concentration of nitrate in pore waters. Calculated as nitrite + nitrate concentration (attribute NO2_plus_NO3) minus nitrite concentration (attribute NO2). A value of -9999 indicates concentration was not determined and a value of -8888 indicates concentration was below detection limit. (Source: producer defined)
    Range of values
    Minimum:0.1
    Maximum:54.8
    Units:micromolar
    Resolution:0.1
    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)
    • Hope L. Ianiri
    • Katlin B. Adamczyk
    • Jaycee J. Favela
    • Amy Gartman
    • Nancy G. Prouty
  2. Who also contributed to the data set?
  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

    831-427-4747 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

Data were obtained as part of a project to assess the geochemistry of Escanaba Trough sediments, a hydrothermal spreading center which contains critical minerals. This work aids our understanding of the geochemistry of marine mineral host sediments and hydrothermal vent processes throughout the global ocean.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 11-Jun-2022 (process 1 of 2)
    POREWATER COLLECTION. Samples were collected via push coring using the ROV Jason and R/V Thomas Thompson. Once recovered shipboard, pore waters were extracted via rhizon samplers with an inline filter pore size 0.15 micrometers attached to a syringe. Pore waters were transferred to centrifuge tubes and stored frozen until analysis.
    Date: 01-Mar-2024 (process 2 of 2)
    MEASUREMENT OF POREWATER NUTRIENTS: Nitrite, nitrate plus nitrite, phosphate, silicic acid, and ammonium were measured via flow injection analysis using a Lachet Instruments QuikChem 8500 Series 2 Flow Injection Analysis System. Person who carried out this activity:
    Ken Marchus
    Analytical Lab of the University of California, Santa Barbara Marine Science Institute
    Lab Manager
    Analytical Lab, Building 520 Room 1011, University of California, Santa Barbara
    Santa Barbara, CA

    805-893-3802 (voice)
    k_a_m@ucsb.edu
  3. What similar or related data should the user be aware of?
    Ianiri, Hope L., Campbell, Pamela L., Gartman, Amy, and Prouty, Nancy G., 2025, Characterizing sedimentary organic carbon in a hydrothermal spreading center, the Escanaba Trough.

    Online Links:

    Other_Citation_Details:
    Ianiri, H.L., Campbell, P., Gartman, A., and Prouty, N.G., 2025, Characterizing sedimentary organic carbon in a hydrothermal spreading center, the Escanaba Trough: Chemical Geology, https://doi.org/10.1016/j.chemgeo.2025.122679.
    Morton, J. L., Zierenberg, Robert A., and Reiss, Carol A., 1994, Geologic, hydrothermal, and biologic studies at Escanaba Trough, Gorda Ridge, offshore northern California.

    Online Links:

    Other_Citation_Details:
    Morton, J.L., Zierenberg, R.A., Reiss, C.A., 1994. Geologic, hydrothermal, and biologic studies at Escanaba Trough: an introduction, in: Geologic, Hydrothermal, and Biologic Studies at Escanaba Trough, Gorda Ridge, Offshore Northern California. U.S. Geological Survey.
    Clague, David. A., Zierenberg, Robert A., Paduan, Jennifer B., Caress, David W., Cousens, Brian L., Dreyer, Brian M., Davis, Alice S., McClain, James, and Ross, Stephanie L., 2022, Emplacement and impacts of lava flows and intrusions on the sediment-buried Escanaba Segment of the Gorda mid-ocean ridge.

    Online Links:

    Other_Citation_Details:
    Clague, D.A., Zierenberg, R.A., Paduan, J.B., Caress, D.W., Cousens, B.L., Dreyer, B.M., Davis, A.S., McClain, J., Ross, S.L., 2022. Emplacement and impacts of lava flows and intrusions on the sediment-buried Escanaba Segment of the Gorda mid-ocean ridge. Journal of Volcanology and Geothermal Research 432, 107701.

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

  1. How well have the observations been checked?
    Analytical precision was 5 percent for all analytes. Results not determined due to a chemical interference with other components of the porewater are reported as -9999 while results below the detection limit are reported as -8888. The detection limits were as follows: PO4: 0.1, Si(OH)4: 1.0, NO2: 0.1, NO2_plus_NO3: 0.2, NH4: 0.2
  2. How accurate are the geographic locations?
    The horizontal accuracy for each sample was obtained from the ROV's Ultra Short Baseline Positioning System (USBL) navigation after calibration to the CASIUS (Calibration of Attitude Sensors In USBL Systems) calibration system. Accuracy for this depth is approximately 10-20 m.
  3. How accurate are the heights or depths?
    The vertical accuracy was determined using multiple DVLs (Doppler Velocity Loggers) on the ROV, which are accurate to less than 1 m.
  4. Where are the gaps in the data? What is missing?
    Dataset is considered complete for the information presented as described in the abstract. Not ever sample has data for every nutrient as some nutrient concentrations were below the limit of detection. 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?
    The measured value of NO2 plus NO3 could not be greater than the measured value of NO2 alone.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
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 as the originator(s) of the dataset and in products derived from these data.
  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 a single csv file (EscanabaTrough_nutrients.csv).
  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?
  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 reading software.

Who wrote the metadata?

Dates:
Last modified: 18-Feb-2025
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: PCMSC Science Data Coordinator
2885 Mission Street
Santa Cruz, CA

831-427-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/ScienceBase/DR_P13XVXQC/EscanabaTrough_nutrients.faq.html>
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