Data · collection
The role of moisture in rock weathering at Teall Island, Victoria Land, Antarctica
Listed in NASA Earthdata CMR
Field measurements and rock samples were taken at Teall Island (03-04) to determine the role of moisture in rock weathering processes along the Victoria land Coast.
Description
Surface and sub-surface temperatures were taken from rocks in the area. Holes were drilled into the rock at 45mm, 90mm and 400mm depths with thermocouples inserted and attached.
Measurements were made at one-minute intervals during each physical visit in order to determine the number of times the temperature gradients at either the surface or the individual depths exceeded 2° C per minute, a recognised threshold for thermal weathering to occur. Three thermocouples were attached to the surface. The data loggers were then set to record the temperature hourly averages for the November to January period.
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Data loggers were left in place till the following season. Surface and sub-surface moisture content was also measured. Surface moisture sensors were attached to the rock surface measuring date, time of surface moisture event and their magnitude.
The time events happened was analysed to see how they correlated with changes in moisture at depth within the rock. Manual measurement were recorded at 45mm and 90mm depths within the rock every four hours for a 5 day period. In addition to these measurements the hardness of the rock site was conducted using a Schmidt Hammer and a sonometer (to measure velocity of sound waves) as proxies for rock strength, digital images of rock surfaces were taken, estimation of the availability of moisture using a rainfall sensor, a general description of the area including GPS co-ordinates, weather characteristics and other relevant features were taken, solar radiation, rock albedo and position of shadows were measures and a series of weather observations was undertaken including; air temperature, air pressure, relative humidity, wind speed and direction, cloud cover and type, visibility and precipitation conditions.
Monitoring of moisture changes in small rock blocks based on measured changes in weight over time was also conducted. Rock samples were collected for later use in laboratory simulations and analysed for their mineral and chemical composition. An empirically based mathematical model will be developed that will predict changes in weathering rate depending on changes in moisture in the rock.
In the 04/05 season data on rock surface and sub-surface temperatures at 1 minute intervals, manual recordings of moisture at 45mm and 90mm depths within the rock every 4 hours for approximately 4 days for each of 2 aspects, download data from over winter data loggers and repeated rock strength, samples and other measurements were carried out.
Links
Documentation and papers
- geog.canterbury.ac.nz /department/staff/christinee.shtml ↗
University of Canterbury, Christchurch New Zealand
documentation · from NASA CMR
Catalogue records · 2
- CMR record cmr.earthdata.nasa.gov/search/concepts/C1214590018-SCIOPS.html ↗
catalogue entry · from NASA CMR
- CMR UMM-JSON cmr.earthdata.nasa.gov/search/concepts/C1214590018-SCIOPS.umm_json ↗
metadata API · from NASA CMR
Topics
- Stated by source
- Erosion · Landscape Processes · Not provided · Rocks Minerals Crystals · Snow · THERMOCOUPLES · Upper Air Temperature
- Inferred from text
- Image 65% · Physical geography and environmental geoscience 74%
Provenance · 1 source records, 15 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Earthdata CMR | C1214590018-SCIOPS | 12 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[field].anzsrc:group:3709 | enrichment · NASA CMR | taxonomy-embedding@1.1.0 | title+keywords+description (74%) |
| concepts[instrument].gcmd_instrument:thermocouples | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/atmosphere/atmospheric-temperature/upper-air-temperature | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/atmosphere/precipitation/solid-precipitation/snow | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/land-surface/erosion-sedimentation/erosion | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/land-surface/landscape/landscape-processes | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/solid-earth/rocks-minerals-crystals | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[modality].local:modality:image | enrichment · NASA CMR | keyword-concept-rules@1.0.0 | title+description (65%) |
| concepts[platform].gcmd_platform:not-provided | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| description | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/Abstract |
| spatial | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/SpatialExtent |
| temporal | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/TemporalExtents |
| title | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/EntryTitle |
| version_label | source · NASA CMR | connector:nasa_cmr@1.0.0 |