Hyporheic sediment characteristics from Von Guerard Stream, Taylor Valley, McMurdo Dry Valleys, Antarctica in January 2019

Summary

Abstract: 

In this data package, we present chlorophyll concentrations, percent loss-on-ignition organic matter, sorbed ammonium concentrations, and percent biogenic silica for hyporheic sediments collected in January 2019 from nine transects across Von Guerard Stream, Taylor Valley, Antarctica. These samples were collected to address questions about the retention and processing of particulate organic matter in the hyporheic zone of McMurdo Dry Valley streams. The nine transects were located at pools, riffles, and meanders (three of each geomorphology type) along Von Guerard Stream and extended across the stream channel to the edges of the wetted zone, ranging from 6.6 to 13.6 m in length. At each sampling location, we collected subsurface bulk sediment down to a depth of 10 cm. We analyzed the sediment samples for chlorophyll-a, phaeophytin, loss-on-ignition, ammonium sorbed to the sediment, and the UV absorbance at 254 nm of sediment extractions. This data package is associated with a complementary data package that contains diatom community assemblages for the same samples.

Date Range: 

January 10, 2019
Data Citation
Heindel, R.C., Singley, J.G., Bergstrom, A.J., Darling, J., Welch, K.A., Mcknight, D.M., Gooseff, M.N. 2021. Hyporheic sediment characteristics from Von Guerard Stream, Taylor Valley, McMurdo Dry Valleys, Antarctica in January 2019. Environmental Data Initiative. DOI: 10.6073/pasta/3f76ccdf3d330df54aed1aee815dab23. Dataset accessed 1 March 2021.
Dataset(s)

Description: 

Hyporheic zone sediment chemistry

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

File: 

HZSEDS_CHEM.csv (4.84 KB)

...or query the dataset by variables and dates of interest:

Short name: 

HZSEDS_CHEM

Dataset ID: 

9033