Tabulated wave parameter results from modeling surface gravity waves on a schematized ancient lake on Mars

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Frequently anticipated questions:

What does this data set describe?

Title:
Tabulated wave parameter results from modeling surface gravity waves on a schematized ancient lake on Mars
Abstract:
This portion of the data release presents tabulated wave parameter results derived from simulations of wind generated surface gravity waves on an ancient lake on Mars. The phase-averaged wave model, SWAN, was applied within the Delft3D modeling system (Deltares, 2018) with reduced gravity and a range of atmospheric densities and wind speeds to simulate potential conditions that could generate wind waves on Mars.
Supplemental_Information:
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  1. How might this data set be cited?
    Stevens, Andrew W., and Rubin, David M., 20220330, Tabulated wave parameter results from modeling surface gravity waves on a schematized ancient lake on Mars: data release DOI:10.5066/P9AA8WKP, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Stevens, Andrew W., and Rubin, David M., 2022, Modeling surface gravity waves on a schematized ancient lake on Mars: data release DOI:10.5066/P9AA8WKP, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -180
    East_Bounding_Coordinate: 180
    North_Bounding_Coordinate: 90
    South_Bounding_Coordinate: -90
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 21-Dec-2017
    Currentness_Reference:
    Time when model inputs were first created
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: csv
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
    2. What coordinate system is used to represent geographic features?
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: Depth below the water surface
      Altitude_Resolution: 0.91
      Altitude_Distance_Units: meters
      Altitude_Encoding_Method:
      Explicit elevation coordinate included with horizontal coordinates
  7. How does the data set describe geographic features?
    Attribute Table
    Table containing attribute information associated with the data set (Source: Producer defined)
    wind_threshold_factor
    Multiple of threshold wind speed required to initiate transport of 125-micron sand grains on the Mars surface (Source: Producer defined)
    Range of values
    Minimum:0.25
    Maximum:4.00
    Units:none
    pressure_mbar
    Atmospheric density used in the model simulation (Source: Producer defined)
    Range of values
    Minimum:6
    Maximum:600
    Units:millibar (mbar)
    wind_speed_ms
    Wind speed at 10 m above the lake surface (Source: Producer defined)
    Range of values
    Minimum:1.08
    Maximum:120
    Units:meters per second (m/s)
    distance_km
    Distance along lake from upwind boundary (Source: Producer defined)
    Range of values
    Minimum:0
    Maximum:20
    Units:kilometer (km)
    depth_m
    Depth of lake below surface (Source: Producer defined)
    Range of values
    Minimum:0
    Maximum:10
    Units:meter (m)
    hsig_m
    Significant wave height (Source: Producer defined)
    Range of values
    Minimum:0
    Maximum:3.58
    Units:meter (m)
    tp_s
    Peak wave period (Source: Producer defined)
    Range of values
    Minimum:0
    Maximum:8.19
    Units:second (s)
    ub_ms
    Near-bed wave orbital velocity (Source: Producer defined)
    Range of values
    Minimum:0
    Maximum:1.1
    Units:meters per second (m/s)
    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)
    • Andrew W. Stevens
    • David M. Rubin
  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?

Model simulations of wave development on an ancient lake on Mars were used in conjunction with analysis of sedimentary structures observed in imagery collected by the Mars rover Curiosity to explore the possibility that wind waves are strong enough to transport sand and form wave ripples. The presence of wave ripples would signify that ice-free liquid water was present on the surface of Mars in the past.

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: 14-Jul-2016 (process 1 of 5)
    The phase-averaged wave model, SWAN, was applied within the Delft3D modeling system to simulate wave growth on a regular, curvilinear grid. The source code of SWAN (version 40.72ABCDE) was modified and recompiled to incorporate variable atmospheric density in the wave calculations.
    Date: 21-Dec-2017 (process 2 of 5)
    A model grid and bathymetry were constructed with a lake basin that was 20 km wide and 10 m deep that sloped up to the shoreline over a distance of 120 m. The model grid contained 50 grid cells along the length of the lake that were spaced at 1.2 km intervals from the upwind coastline to 18 km downwind. Between 18 km and the shoreline, the grid spacing gradually decreased to as fine as 6.5 m to better resolve shallow-water processes. Wave development was simulated for 24 frequency bins between 0.05 and 1 Hz using 3rd generation physics and default values for bottom friction, white-capping, depth-induced breaking, and wind growth (Deltares, 2018).
    Date: 24-Aug-2021 (process 3 of 5)
    Three sets of simulations were performed with atmospheric densities of 6, 60, and 600 mbar. For each atmospheric density, 5 wind speeds corresponding to 0.25, 0.5, 1, 2, and 4 times the threshold wind speed needed to initiate tranport of 125-micron sand grains on land were prescribed. See Rubin and others (2022) for details on how the threshold wind speeds were determined.
    Date: 23-Feb-2022 (process 4 of 5)
    Results from all model simulations were tablulated and written to comma-separated text files for distribution.
    Date: 06-Apr-2022 (process 5 of 5)
    Corrected URL for the accompanying journal article. No data were changed. (scochran@usgs.gov)
  3. What similar or related data should the user be aware of?
    Rubin, D.M., Lapotre, M.A.G., Stevens, A.W., Lamb, M.P., Fedo, C.M., Grotzinger, J.P., Gupta, S., Stack, K.M., Vasavada, A.R., Banham, S.G., Bryk, A.B., Christian, J.R., Edgar, L.A., and Caravaca, G., 2022, Ancient winds, waves, and atmosphere in Gale Crater, Mars, inferred from sedimentary structures and wave modeling.

    Online Links:

    Other_Citation_Details: Journal of Geophysical Research: Planets
    Banfield, D., Donelan, M., and Cavaleri, L., 2015, Winds, waves and shorelines from ancient martian seas.

    Online Links:

    Other_Citation_Details: Icarus, v. 250, pp. 368-383.
    Deltares, 2018, Delft3D Wave User Manual (version 3.05).

    Online Links:

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

  1. How well have the observations been checked?
    The wave model SWAN used in this dataset was previously tested with experiments in a low-pressure wind tunnel and found that the model could accurately simulate the development of waves at low atmospheric pressure (Banfield and others, 2015).
  2. How accurate are the geographic locations?
    No formal positional accuracy tests were conducted.
  3. How accurate are the heights or depths?
    No formal positional accuracy tests were 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?
    All data fall within expected ranges.

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 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? Tabulated outputs containing wave parameters and near-bed orbital velocities are provided in comma-separated text format along with associated metadata.
  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?

Who wrote the metadata?

Dates:
Last modified: 06-Apr-2022
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_P9AA8WKP/mars_wave_params_metadata.faq.html>
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