Published on McMurdo Dry Valleys LTER (https://mcm.lternet.edu)

HZSEDS_CHEM

Description: 

Hyporheic zone sediment chemistry

File: 

File HZSEDS_CHEM.csv

Variables (click to expand): 

DATASET_CODE
  • Label: Dataset code
  • Definition: Internal dataset code.
  • Type: Nominal
  • Missing values: None specified
SAMPLE_DATE
  • Label: Sample date
  • Definition: Date samples were collected.
  • Type: Date/time
  • Date format: MM/DD/YYYY
  • Missing values: None specified
SAMPLE_ID
  • Label: Sample identifier
  • Definition: Unique sample identifier that contains the geomorphology type, the transect number, and the lateral position.
  • Type: Code list
  • Codes:
    • M = meander
    • P = pool
    • R = riffle
  • Missing values: None specified
TRANSECT
  • Label: Transect identifier
  • Definition: Transect identifier. Transects are numbered from north to south.
  • Type: Code list
  • Codes:
    • M = meander
    • P = pool
    • R = riffle
  • Missing values: None specified
GEOMORPH
  • Label: Geomorphic classification
  • Definition: Geomorphic classification type of the sample/transect location.
  • Type: Nominal
  • Missing values: None specified
LATERAL_POSITION
  • Label: Lateral position
  • Definition: Lateral position of the sample across the transect.
  • Type: Code list
  • Codes:
    • 1 = margin of the wetted zone (inside bank for meanders)
    • 2 = intermediate
    • 3 = stream thalweg
    • 4 = intermediate
    • 5 = margin of the wetted zone (outside bank for meanders)
  • Missing values: None specified
DISTANCE
  • Label: Distance from thalweg
  • Definition: Absolute distance from the center of the stream channel.
  • Type: Physical quantity
  • Unit: meter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
LOI
  • Label: Loss on ignition
  • Definition: Percent loss-on-ignition organic matter relative to sediment dry weight.
  • Type: Physical quantity
  • Unit: percent
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
CHL_A
  • Label: Chlorophyll a
  • Definition: Concentration of Chlorophyll a, normalized by sediment dry weight.
  • Type: Physical quantity
  • Unit: microgramsPerGram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
PHAEOPHYTIN
  • Label: Phaeophytin
  • Definition: Concentration of the degraded phaeopigment normalized by sediment dry weight.
  • Type: Physical quantity
  • Unit: microgramsPerGram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
BIOGENIC_SILICA
  • Label: Biogenic silica
  • Definition: Percent biogenic silica relative to sediment dry weight.
  • Type: Physical quantity
  • Unit: percent
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
SORBED_AMMONIUM
  • Label: Sorbed ammonium
  • Definition: Concentration of ammonium adsorbed to sediment relative to sediment dry weight, expressed as micrograms of nitrogen per gram of dry weight sediment.
  • Type: Physical quantity
  • Unit: microgramsPerGram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
ABSORBANCE
  • Label: Absorbance
  • Definition: UV absorbance at 254 nm of the KCl extractions used to measure sorbed ammonium.
  • Type: Physical quantity
  • Unit: absorbanceUnits
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
Source URL: https://mcm.lternet.edu/content/hzsedschem