biogeo_data_bloodfalls

Bloodfalls Geomicrobiology Summary: Samples were collected from subglacial outflow waters associated with Blood Falls discharge during austral summers from 1999-2003. Samples near the outlet of Blood Falls were collected for enumeration and bacterial activity in December of 2000 and 2001. A transect of samples (TransX) was collected in December (see Figure 1), 2002 to capture a profile of releases from Blood Falls into Lake Bonney, starting at the source of the outflow (Trans1) and out onto the moat ice surrounding the lake with increasing distance from the source (Trans2-5). Trans2 was collected from basal ice below the source, Trans3 was collected from waters at the shoreline where Blood Falls meets the moat ice, Trans4 was collected 5 m from the shoreline just below moat ice that melted and refroze daily, and Trans5 was collected under 0.4 m of moat ice approximately 70 m from the shoreline before the moat ice meets the permanent ice cover of Lake Bonney.

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Variables
Sample Location
  • Label: Sample Location
  • Definition: Sample Location
  • Type: Nominal
  • Missing values: None specified
pH
  • Label: pH
  • Definition: pH
  • Type: Physical quantity
  • Unit: pH
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • NULL = none detected or not available
DO (uM O2)
  • Label: DO (µM O2)
  • Definition: Dissolved oxygen (DO) was determined by Winkler titration.
  • Type: Physical quantity
  • Unit: molarity
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
Eh (mV)
  • Label: Eh (mV)
  • Definition: Conductivity was measured at 1-meter depth intervals in the west lobe of Lake Bonney using a Seabird SBE-25 conductivity temperature depth (CTD) sensor (Sea-Bird Electronics, Inc., Bellevue, Washington).
  • Type: Physical quantity
  • Unit: millivolt
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • NULL = not detected or not available
DIC (uM)
  • Label: DIC (µM)
  • Definition: Dissolved inorganic carbon (DIC) was measured by infrared gas analysis on acid sparged samples.
  • Type: Physical quantity
  • Unit: molarity
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • NULL = none detected or not available
DIN (uM)
  • Label: DIN (µM)
  • Definition: Dissolved inorganic nitrogen (DIN) was reported as the summation of nitrate, nitrite and ammonium (DIN = NO3-+ NO2-+ NH4+).
  • Type: Physical quantity
  • Unit: molarity
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • NULL = not determined or not available
SRP (uM)
  • Label: SRP (µM)
  • Definition: Soluble reactive phosphorus (SRP) was determined on 10 ml samples with the antimony-molybdate method (Standard Methods, 1992), absorbance was read in a 10 cm cell with a Beckman DU-640 spectrophotometer.
  • Type: Physical quantity
  • Unit: molarity
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • NULL = none detected or not available
DIN:SRP (uM)
  • Label: DIN:SRP
  • Definition: The ratio of DIN to SRP. Useful for looking a phosphorus deficiency.
  • Type: Physical quantity
  • Unit: molarity
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • ND = none detected or not available
DOC (uM C)
  • Label: DOC (µM C)
  • Definition: Dissolved organic carbon (DOC) was measured on filtered (25mm Whatman GF/F), acidified (HCl to pH~2-3) samples with a Shimadzu 5000 TOC analyzer.
  • Type: Physical quantity
  • Unit: molarity
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • NULL = not detected or not available
CHL (ug per L)
  • Label: CHL (µg per L)
  • Definition: Chlorophyll-a (CHL) was extracted into 90% acetone for 24 h at <0 °C in the dark from particles collected on a Whatman GF/F filter, and the subsequent concentration was determined fluorometrically.
  • Type: Physical quantity
  • Unit: microgramsPerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • NULL = none detected or not available
Bacteria (cells per mL)
  • Label: Bacteria (10^4 cells per mL)
  • Definition: Environmental (in situ) cell abundance as determined on 0.2 μm-filtered samples.
  • Type: Physical quantity
  • Unit: cellsPERmL
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • NULL = none detected or not available
Data Source Details

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