Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Skip to content
  • Feedback

    • MBARI-MARS Hybrid Millidecade Spectra

    Metadata Updated: October 2, 2025

    To understand natural and anthropogenic sound in the ocean, and to compare underwater soundscapes globally, standard methods of analysis must be applied to passive acoustic monitoring (PAM) data. Methods that balance constrained volume and adequate resolution of acoustic spectra have recently been published (Martin et al., 2021a,b). These records are the results of this standardized analysis of PAM data, specifically calculation of hybrid millidecade (HMD) sound pressure levels derived from calibrated passive acoustic data from a long-term monitoring effort in the U.S. national marine sanctuary system. Daily HMD at 1 minute resolution were created using PyPAM software v0.2.0.

    Access & Use Information

    License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Date September 22, 2025
    Metadata Created Date December 1, 2023
    Metadata Updated Date October 2, 2025
    Reference Date(s) August 14, 2023 (publication)
    Frequency Of Update asNeeded

    Metadata Source

    Harvested from NGDC MGG Passive Acoustic

    Other Data Resources

    Graphic Preview

    Representative hybrid millidecade spectra image

    Additional Metadata

    Resource Type Series
    Metadata Date September 22, 2025
    Metadata Created Date December 1, 2023
    Metadata Updated Date October 2, 2025
    Reference Date(s) August 14, 2023 (publication)
    Responsible Party DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce (Point of Contact); (Point of Contact)
    Contact Email
    Guid gov.noaa.ncei.pad:MBARI-MARS_HMD
    Access Constraints Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives., Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose, Cite as: Monterey Bay Aquarium Research Institute. 2023. Hybrid Millidecade Spectra at 1 Minute Resolution Recorded at the Monterey Accelerated Research System (MARS) Cabled Observatory. NOAA National Centers for Environmental Information. https://doi.org/10.25921/6gvv-dk87. [access date]
    Bbox East Long -180.0
    Bbox North Lat 90.0
    Bbox South Lat -90.0
    Bbox West Long -180.0
    Coupled Resource
    Frequency Of Update asNeeded
    Graphic Preview Description Representative hybrid millidecade spectra image
    Graphic Preview File https://www.ngdc.noaa.gov/mgg/pad/browse/MBARI-MARS_HMD.jpg
    Graphic Preview Type png
    Harvest Object Id 23d7c5df-70c2-40be-9b71-dcc132919077
    Harvest Source Id 8812445c-2f10-47c5-80d9-c1bc92ca956d
    Harvest Source Title NGDC MGG Passive Acoustic
    Licence
    Lineage
    Metadata Language eng; USA
    Metadata Type geospatial
    Old Spatial {"type": "Point", "coordinates": [-180.0, -90.0]}
    Progress
    Spatial Data Service Type
    Spatial Reference System
    Spatial Harvester True
    Temporal Extent Begin 2021-01-01T00:00:00
    Temporal Extent End 2021-12-31T23:59:00

    Didn't find what you're looking for? Suggest a dataset here.