subglacial_geochem_bloodfalls

Bloodfalls Subglacial Release Geochemistry Summary: The chemistry of Blood Falls was first sampled by Hamilton et al. in 1958 and again by Black et al. in 1962 (Hamilton et al., 1962 and Black et al., 1965). However, in these studies, the researchers sampled the salt precipitates, or the salt cone that formed around the terminus of the Taylor Glacier, they did not sample true, unaltered outflow. Keys (1979) collected the first detailed chemical data in 1978 on what he described as a discharge of saline icing at Blood Falls.†Since the inception of the McMurdo LTER in 1992, flow from Blood Falls has been sampled routinely, providing over a decade of chemical data (data available in this site). It is clear from these geochemical data that the source water of Blood Falls is marine in origin (Lyons et al., 1998, 1999) and that the release of ancient subglacial fluid is episodic in nature resulting in complex and dynamic chemistry of waters sampled at Blood Falls (Lyons et al., 2005).

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Variables
DATE_TIME
  • Label: Collection Date
  • Definition: Collection Date
  • Type: Date/time
  • Date format: MM/DD/YYYY
  • Missing values: None specified
Temp
  • Label: Temperature
  • Definition: Temperature
  • Type: Physical quantity
  • Unit: celsius
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • NULL = not available
pH
  • Label: pH
  • Definition: pH as measured with a calibrated Beckman 12 pH meter
  • Type: Physical quantity
  • Unit: dimensionless
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • NULL = Not available
DOC
  • Label: DOC (µM)
  • Definition: Dissolved organic carbon (DOC) was measured on filtered (25 mm Whatman GF/F) acidified 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 available
DIC
  • Label: DIC (mM)
  • 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 = not available
DO
  • Label: DO (mM)
  • 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:
    • NULL = not available
Cells
  • Label: Cells (1x10^5)
  • Definition: Cell counts of 10mL outflow samples
  • Type: Physical quantity
  • Unit: counts
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • NULL = not available
%live
  • Label: %live
  • Definition: Percentage live cells in outflow samples
  • Type: Physical quantity
  • Unit: percent
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • NULL = not available
Cl-
  • Label: Cl- (mM)
  • Definition: Cl- concentration
  • Type: Physical quantity
  • Unit: molarity
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • NULL = not available
SO42
  • Label: SO4 2- (mM)
  • Definition: SO4 2-
  • Type: Physical quantity
  • Unit: molarity
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
SO4:Cl
  • Label: SO4:Cl
  • Definition: The ratio of SO4 to Cl
  • Type: Physical quantity
  • Unit: molarity
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • NULL = not available
Data Source Details

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