{
    "tag": 18959,
    "title": "Chirp seismic reflection and navigation data collected in Chesapeake Bay during USGS Field Activity 2022-020-FA",
    "pubdate": "20250428",
    "sername": null,
    "series_name": null,
    "issue": "DOI:10.5066\/P13DCCU3",
    "publish": null,
    "publisher_name": null,
    "onlink": "https:\/\/cmgds.marine.usgs.gov\/catalog\/whcmsc\/DRB_data_release\/DRB_P13DCCU3\/2022-020-FA_ET3400_meta.faq.html",
    "format": null,
    "email": null,
    "descript": "In July 2022, the U.S. Geological Survey (USGS) and the University of Maryland\u2019s Chesapeake Biological Laboratory conducted a study, USGS Field Activity Number (FAN) 2022-020-FA, in Chesapeake Bay to quantify greenhouse gas fluxes from the largest estuary in the United States. The team investigated the environmental factors that control the distribution and exchange of methane and carbon dioxide in the sediments, water column, and fluxes across the atmospheric boundary layer(sea-air interface) during the annual summer occurrence of widespread anoxia that threatens the health of the bay. As part of this study, chirp seismic-reflection profiles were collected along a series of transects to characterize the sediments, stratigraphy, and acoustic signatures of gas in the sediments.",
    "lang": null,
    "journal": null,
    "pwid": null,
    "originator": [
        {
            "name": "Foster, David S.",
            "role": "Author"
        },
        {
            "name": "Baldwin, Wayne E.",
            "role": "Author"
        },
        {
            "name": "Pohlman, John W.",
            "role": "Author"
        },
        {
            "name": "Lapham, Laura L.",
            "role": "Author"
        }
    ],
    "index_term": [
        {
            "thcode": 2,
            "code": "474",
            "name": "geospatial datasets",
            "scope": "Collections of related digital information that are geographically referenced."
        },
        {
            "thcode": 2,
            "code": "575",
            "name": "image collections",
            "scope": "Visible representations of objects or earth properties produced by cameras, spectral instruments, or as graphical representations of measurements."
        },
        {
            "thcode": 2,
            "code": "706",
            "name": "marine geology",
            "scope": "Branch of geology concerned with the composition, geologic history, and earth processes of the ocean floor and the continental margin."
        },
        {
            "thcode": 2,
            "code": "707",
            "name": "marine geophysics",
            "scope": "Branch of earth sciences concerned with the physical processes of the oceans and continental margins.  We include here studies of large bodies of brackish and fresh water, such as lakes and rivers."
        },
        {
            "thcode": 2,
            "code": "2078",
            "name": "navigational data",
            "scope": "Geospatial data indicating the locations of instruments, vessels, aircraft, or other vehicles used to collect scientific observations.  These data include horizontal coordinates in sequence, and may include time or vertical position."
        },
        {
            "thcode": 2,
            "code": "1045",
            "name": "seismic reflection methods",
            "scope": "Geophysical technique to study the subsurface of the earth using sound waves induced by explosives, vibrating devices, or percussive equipment.  The reflections of the sound waves from the boundaries of different rocks are measured."
        },
        {
            "thcode": 2,
            "code": "2054",
            "name": "sub-bottom profiling",
            "scope": "Methods of imaging the structure of sediments below the sea floor  or lakebed using ship-borne or towed sensors with a variety of sound sources."
        },
        {
            "thcode": 15,
            "code": "008",
            "name": "geoscientificInformation",
            "scope": "Information pertaining to earth sciences, for example geophysical features and processes, geology, minerals, sciences dealing with the composition, structure and origin of the earth's rocks, risks of earthquakes, volcanic activity, landslides, gravity information, soils, permafrost, hydrogeology, groundwater, erosion"
        },
        {
            "thcode": 15,
            "code": "013",
            "name": "location",
            "scope": "Positional information and services, for example addresses, geodetic networks, geodetic control points, postal zones and services, place names, geographic names"
        },
        {
            "thcode": 15,
            "code": "014",
            "name": "oceans",
            "scope": "Features and characteristics of salt water bodies (excluding inland waters), for example tides, tidal waves, coastal information, reefs, maritime, outer continental shelf submerged lands, shoreline"
        }
    ],
    "place_term": [
        {
            "thcode": 1,
            "code": "fUS",
            "name": "United States",
            "scope": "country",
            "pname": "North America"
        },
        {
            "thcode": 1,
            "code": "h02080101",
            "name": "Lower Chesapeake Bay",
            "scope": "hydrologic unit",
            "pname": "Lower Chesapeake"
        },
        {
            "thcode": 1,
            "code": "h02060001",
            "name": "Upper Chesapeake Bay",
            "scope": "hydrologic unit",
            "pname": "Upper Chesapeake"
        },
        {
            "thcode": 1,
            "code": "fOC13",
            "name": "North Atlantic",
            "scope": "ocean or sea",
            "pname": "Atlantic"
        },
        {
            "thcode": 1,
            "code": "fUS24",
            "name": "Maryland",
            "scope": "state",
            "pname": "United States"
        },
        {
            "thcode": 1,
            "code": "fUS51",
            "name": "Virginia",
            "scope": "state",
            "pname": "United States"
        }
    ],
    "image": [
        {
            "name": "https:\/\/cmgds.marine.usgs.gov\/data-releases\/media\/2025\/10.5066-P13DCCU3\/505e1c0f0ef449e0905548be4c201bf8\/2022-020-FA_ET3400_browse.jpg",
            "description": "Thumbnail image showing the extent of chirp seismic-reflection profile tracklines and example profiles collected in Chesapeake Bay, Maryland and Virginia."
        }
    ],
    "fan": [
        "2022-020-FA"
    ]
}