{
    "tag": 17782,
    "title": "Collection, analysis, and age-dating of sediment cores from a salt marsh platform and ponds, Rowley, Massachusetts, 2014-15",
    "pubdate": "20201222",
    "sername": null,
    "series_name": null,
    "issue": "DOI:10.5066\/P9HIOWKT",
    "publish": null,
    "publisher_name": null,
    "onlink": "https:\/\/cmgds.marine.usgs.gov\/catalog\/whcmsc\/SB_data_release\/DR_P9HIOWKT\/metadata_PIE_marsh_radioisotopes.faq.html",
    "format": null,
    "email": null,
    "descript": "Sediment cores were collected from three sites within the Plum Island Ecosystems Long-Term Ecological Research (PIE-LTER) domain in Massachusetts to obtain estimates of long-term marsh decomposition and evaluate shifts in the composition and reactivity of sediment organic carbon in disturbed marsh environments. Paired sediment cores were collected from three sites on the marsh platform and from three ponds; these cores were about 100 and 50 centimeters in length, respectively. The marsh sites had similar elevations, at about 1.41 to 1.51 meters relative to the North American Vertical Datum of 1988, and similar salt marsh grass communities, dominated by Spartina patens, S. alterniflora, and Distichlis spicata. Permanently inundated ponds within each site had comparable depths (0.24\u20130.30 meters) but varied in size (between 643 and 7,149 square meters; Spivak et al., 2017, 2018). The U.S. Geological Survey analyzed radioisotope concentrations for lead-210, radium-226, cesium-127, and beryllium-7 from six marsh cores and three pond cores to develop an age model for each core. This data release includes calculated percent dry bulk density and raw radioisotope data for these cores.    Spivak, A.C., Gosselin, K., Howard, E., Mariotti, G., Forbrich, I., Stanley, R., and Sylva, S.P., 2017, Shallow ponds are heterogeneous habitats within a temperate salt marsh ecosystem: Journal of Geophysical Research-Biogeosciences, 122(6), 1371-1384.    Spivak, A. C., Gosselin, K. M., and Sylva, S.P., 2018, Shallow ponds are biogeochemically distinct habitats in salt marsh ecosystems: Limnology and Oceanography, 63(4), 1622-1642.",
    "lang": null,
    "journal": null,
    "pwid": null,
    "originator": [
        {
            "name": "Luk, Sheron Y.",
            "role": "Author"
        },
        {
            "name": "Spivak, Amanda C.",
            "role": "Author"
        },
        {
            "name": "Eagle, Meagan J.",
            "role": "Author"
        },
        {
            "name": "O'Keefe Suttles, Jennifer A.",
            "role": "Author"
        }
    ],
    "index_term": [
        {
            "thcode": 2,
            "code": "2062",
            "name": "piston coring",
            "scope": "Use of a piston mechanism and a weight with a triggering mechanism to drive a coring tube deep into underwater sediments for extraction and study."
        },
        {
            "thcode": 2,
            "code": "954",
            "name": "radiometric dating",
            "scope": "Methods for age determination of rocks and fossils by measuring the proportions of naturally occurring radioactive isotopes to their decay products."
        },
        {
            "thcode": 2,
            "code": "1036",
            "name": "sedimentation",
            "scope": "Process of deposition of sediments (loose, uncemented pieces of rock, mineral fragments, or biological materials).  The sediments settle out of water or air into layers on a surface."
        },
        {
            "thcode": 2,
            "code": "1078",
            "name": "soil chemistry",
            "scope": "Branch of chemistry concerned with the elements and compounds that make up soils. Includes chemical processes involving soils."
        },
        {
            "thcode": 2,
            "code": "1326",
            "name": "wetland ecosystems",
            "scope": "Ecosystems whose soil is saturated for long periods seasonally or continuously, including marshes, swamps, and ephemeral ponds.  More detailed terms for wetlands can be selected from the FGDC Wetland Classification <http:\/\/fgdc.gov\/standards\/status\/sub3_4.html>."
        },
        {
            "thcode": 15,
            "code": "002",
            "name": "biota",
            "scope": "Flora or fauna in natural environment, for example wildlife, vegetation, biological sciences, ecology, wilderness, sea life, wetlands, habitat, biological resources"
        },
        {
            "thcode": 15,
            "code": "007",
            "name": "environment",
            "scope": "Environmental resources, protection and conservation, for example environmental pollution, waste storage and treatment, environmental impact assessment, monitoring environmental risk, nature reserves, landscape, water quality, air quality, environmental modeling"
        },
        {
            "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"
        }
    ],
    "place_term": [],
    "image": [
        {
            "name": "https:\/\/www.sciencebase.gov\/catalog\/file\/get\/5fb41153d34eb413d5e0af37\/?name=PlumIsland_pond_creek.jpeg",
            "description": "Photograph of a salt marsh pond (left) and tidal creek (right) within the Plum Island Long-Term Ecological Research domain, Rowley, MA. Photo credit: Sheron Y. Luk"
        }
    ],
    "fan": []
}