APEX Borehole Nuclear Magnetic Resonance (NMR) Data and Models from 2018-2020
Geophysical measurements and related field data were collected by the U.S. Geological Survey (USGS) at the Alaska Peatland Experiment (APEX) site in Interior Alaska from 2018 to 2020 to characterize subsurface thermal and hydrologic conditions along a permafrost thaw gradient. The APEX site is managed by the Bonanza Creek LTER (Long Term Ecological Research). Nine instrument sites were established in April 2018, seven of which were given a borehole approximately 2.3 meters (m) deep for repeat nuclear magnetic resonance (NMR) logging to quantify unfrozen water content and soil properties in the near surface. NMR data were collected from each borehole a total of ten times between April 2018 and October 2020, at a nominal vertical interval of 12.5 centimeters (cm) from 0-2 m depth. The raw spin-echo decay data, T2 decay data, and inverted models of unfrozen water content and pore-size distributions are provided in comma-separated files (*csv). The original binary (*lvm) files are also provided within the compressed zip folder.
Complete Metadata
| accessLevel | public |
|---|---|
| bureauCode |
[
"010:12"
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|
| contactPoint |
{
"fn": "Stephanie R James",
"@type": "vcard:Contact",
"hasEmail": "mailto:sjames@usgs.gov"
}
|
| description | Geophysical measurements and related field data were collected by the U.S. Geological Survey (USGS) at the Alaska Peatland Experiment (APEX) site in Interior Alaska from 2018 to 2020 to characterize subsurface thermal and hydrologic conditions along a permafrost thaw gradient. The APEX site is managed by the Bonanza Creek LTER (Long Term Ecological Research). Nine instrument sites were established in April 2018, seven of which were given a borehole approximately 2.3 meters (m) deep for repeat nuclear magnetic resonance (NMR) logging to quantify unfrozen water content and soil properties in the near surface. NMR data were collected from each borehole a total of ten times between April 2018 and October 2020, at a nominal vertical interval of 12.5 centimeters (cm) from 0-2 m depth. The raw spin-echo decay data, T2 decay data, and inverted models of unfrozen water content and pore-size distributions are provided in comma-separated files (*csv). The original binary (*lvm) files are also provided within the compressed zip folder. |
| distribution |
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"title": "Original Metadata",
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|
| identifier | http://datainventory.doi.gov/id/dataset/USGS_5fe12da0d34e30b9123f0388 |
| keyword |
[
"Active layer thickness",
"Alaska",
"Bonanza Creek",
"Borehole nuclear magnetic resonance",
"Disturbance",
"Fairbanks North Star",
"GGGSC",
"Geology, Geophysics, and Geochemistry Science Center",
"Hydrologic processes",
"Land Change Science Program",
"Permafrost",
"U.S. Geological Survey",
"USGS",
"USGS:5fe12da0d34e30b9123f0388",
"environment",
"field monitoring stations",
"geoscientificInformation",
"hydrologic processes",
"permafrost"
]
|
| modified | 2021-05-26T00:00:00Z |
| publisher |
{
"name": "U.S. Geological Survey",
"@type": "org:Organization"
}
|
| spatial | -148.32389, 64.695576, -148.320895, 64.696619 |
| theme |
[
"Geospatial"
]
|
| title | APEX Borehole Nuclear Magnetic Resonance (NMR) Data and Models from 2018-2020 |
