EBSSED database-Surficial sediments of the eastern Bering Sea continental shelf

In order to facilitate descriptions of groundfish habitat over a large portion of the EBS shelf, the NMFS/AFSC has assembled a single comprehensive database of the point sample data (EBSSED; n=2,587) from all available sources. The database represents sediment variation over the study area with uncompromized (i.e., original) spatial detail. Textural data in the database are of two main types: 1) standardized statistics characterizing sample grain size distribution based on laboratory measurements (granulometric data), including percent composition by size grades (e.g., gravel, sand, mud) and size distribution parameters (e.g., mean size); and 2) sample descriptions from less exacting, more subjective visual/tactile observations, usually made in the field, establishing size-grade constituents. In addition the EBSSED database includes two descriptive fields which were each added to characterize sample grain size distribution by a single, standardized variable based on the original data. These fields classify samples according to gravel-sand-mud composition using high and low resolution schemes derived from Folk's (1954) classic ternary diagram. The high resolution scheme classifies 903 samples with detailed granulometric data into 15 textural classes, providing the greater detail regarding textural variation. The low resolution scheme (7 classes) is designed to allow unambiguous classification of nearly all samples (n=2457) including those with subjective visual/tactile descriptions. It represents the maximum number of samples according to a single common variable and thus provides the most spatially detailed data for the study area, albeit at the expense of some of the textural detail for samples analyzed in the laboratory. Overall, the EBSSED database is the most comprehensive and detailed source of information about surficial sediment textures in the EBS study area. Patterns observed in the data generally agree with large-scale textural maps and summaries by previous investigators, particularly a general pattern, with exceptions, of decreasing average grain size with increasing depth and distance from shore. However, those previous large-scale works spatially smoothed data for the study area from smaller, more sparsely distributed sets of samples. The EBSSED database preserves potentially important fine-scale variation.

Data and Resources

Additional Info

Field Value
Last Updated June 10, 2017, 18:12
Created June 10, 2017, 18:12
access_constraints ["Cite as: Smith, K.R., and R.A. McConnaughey, 1999, Surficial sediments of the eastern Bering Sea continental shelf: EBSSED database documentation. U.S. Dep. Commer., NOAA Tech. Memo. NMFS-AFSC-104, 41 p.", "Access to this dataset is unrestricted.", "While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty."]
bbox-east-long -157.7
bbox-north-lat 62.1535
bbox-south-lat 53.8575
bbox-west-long -179.1117
contact-email geology.info@noaa.gov
coupled-resource []
dataset-reference-date [{"type": "publication", "value": "1999-12-31"}, {"type": "revision", "value": "1999-12-31"}]
frequency-of-update notPlanned
graphic-preview-description sample locations in study area
graphic-preview-file https://www.ngdc.noaa.gov/mgg/image/geolin/preview03995012.gif
graphic-preview-type GIF
guid gov.noaa.ngdc.mgg.geology:G02124
licence ["Please cite the original NMFS technical report, and the National Centers for Environmental Information, NOAA, as the source of the data.", "These data were produced by the Alaska Fisheries Science Center, 7600 Sand Point Way N.E., Bin C-15700, Seattle, WA 98115-0070, U.S. Department of Commerce, National Oceanic and Atmospheric Administration. Not subject to copyright protection within the United States."]
metadata-date 2015-12-31
metadata-language eng: USA
progress completed
resource-type dataset
responsible-party [{"name": "DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce", "roles": ["pointOfContact"]}]
spatial {"type": "Polygon", "coordinates": [[[-179.1117, 53.8575], [-157.7, 53.8575], [-157.7, 62.1535], [-179.1117, 62.1535], [-179.1117, 53.8575]]]}
spatial-data-service-type
spatial-reference-system urn:ogc:def:crs:EPSG:4326
spatial_harvester true
temporal-extent-begin 1934-01-01
temporal-extent-end 1997-12-31