Variables (click to expand):
DATASET_CODE
- Label: Dataset code
- Definition: DATASET_CODE
- Type: Nominal
- Missing values: None specified
BASIN
- Label: Basin
- Definition: Identifies the region where the sample was collected; either Fryxell Basin or Bonney Basin
- Type: Nominal
- Missing values: None specified
MOISTURE_LEVEL
- Label: Soil Moisture Level
- Definition: Identifies the moisture level of the soil sample; either dry or saturated. Dry samples are from outside of stream channels, while saturated samples are from the hyporheic zone.
- Type: Nominal
- Missing values: None specified
SAMPLE_ID
- Label: Sample ID
- Definition: Unique sample identifier. LB=Lake Bonney; LF=Lake Fryxell; D=dry; W=wet
- Type: Nominal
- Missing values: None specified
LATITUDE
- Label: Latitude
- Definition: Latitude in decimal degrees.
- Type: Nominal
- Missing values: None specified
LONGITUDE
- Label: Longitude
- Definition: Longitude in decimal degrees.
- Type: Nominal
- Missing values: None specified
GRAIN_ID
- Label: Grain ID
- Definition: Unique grain identifier. P=phosphorus. We separated more than 50 apatite grains from each sample.
- Type: Nominal
- Missing values: None specified
PITTING_INDEX
- Label: Pitting Index
- Definition: A qualitative index of how chemically altered the apatite grain was. Our pitting index ranges from 1 (grains with few to no etch pits) to 4 (grains with etch pits covering the entire grain surface).
- Type: Nominal
- Missing values: None specified
ASPECT_RATIO
- Label: Aspect Ratio
- Definition: The length of the long axis of the grain divided by the length of the short axis, giving a measure of how elongated grains are. An aspect ratio of 1 is a perfectly round grain.
- Type: Nominal
- Missing values: None specified
PERCENT_CRYSTAL_FACES
- Label: Percent Crystal Faces
- Definition: The percent of the total visible grain area that was a recognizable crystal face.
- Type: Nominal
- Missing values: None specified
Source URL: https://mcm.lternet.edu/content/soilsapatite