Halogen chemistry and isotopic composition in McMurdo lake waters and pore fluids

Summary

Abstract: 

As part of a collaborative investigation between researchers at Rice University, Arkansas State University, University of Rochester, and Ohio State University, lakes of the McMurdo Dry Valleys were sampled at discreet depth intervals during the 2005-2006 field season.  Sample splits were subsequently analyzed for chemical and isotopic composition of both gases and dissolved  ions, as well as dissolved organic carbon. In addition, cryogenic salts were sampled in the surrounding lake shores in order to determine the salt sources. Gravity cores were also obtained and the pore waters were collected by centrifuging the wet sediment.
 
Presented  in this file are the dissolved halogens :chloride, bromide, and total iodine in lake waters and pore waters. The isotopic composition of I-129 and Cl-36 are also presented for these same samples, as are the molar ratios of I-129/I-127, and Cl-36/Cl-37.   Alkalinity was also determined in order to subsequently investigate the relationship between the oxidation of organic matter and the release of iodine into the lake waters.

Date Range: 

Friday, December 9, 2005 to Saturday, January 7, 2006

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Variables: 

DATASET_CODE
  • Label:
  • Definition: Table Identifier
  • Type: Nominal
  • Missing values: None specified
LOCATION_NAME
  • Label: Location Name
  • Definition: Name of lake where measurement was made
  • Type: Nominal
  • Missing values: None specified
LOCATION_TYPE
  • Label:
  • Definition: Sample type description and/or location
  • Type: Nominal
  • Missing values: None specified
SAMPLE_ID
  • Label:
  • Definition: Sample identification code
  • Type: Nominal
  • Missing values: None specified
LATITUDE
  • Label:
  • Definition: Sample Latitude
  • Type: Physical quantity
  • Unit: degree
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • Null = None given
LONGITUDE
  • Label:
  • Definition: Sample Longitude
  • Type: Physical quantity
  • Unit: degree
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • Null = None given
DATE_TIME
  • Label:
  • Definition: Date sample was collected
  • Type: Date/time
  • Date format: mm/dd/yyyy
  • Missing values: None specified
DEPTH (m)
  • Label: Depth
  • Definition: Stream, pond, or lake depth. In the case of ice-covered lakes, depth is in meters below the upper ice surface.
  • Type: Physical quantity
  • Unit: meter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • Null = None given
alk (meq/L)
  • Label:
  • Definition: Alkalinity in milliequivalents per liter
  • Type: Physical quantity
  • Unit: meq/L
  • Maximum: 62.17
  • Minimum: 0.49
  • Precision: Not specified
  • Missing values:
    • NULL = None given
I (umol/kg)
  • Label:
  • Definition: Total dissolved iodine in micromoles per kilogram
  • Type: Physical quantity
  • Unit: umol/kg
  • Maximum: 8.109
  • Minimum: 0.004
  • Precision: Not specified
  • Missing values:
    • NULL = None given
Br (umol/kg)
  • Label:
  • Definition: Total dissolved bromine in micromoles per kilogram
  • Type: Physical quantity
  • Unit: umol/kg
  • Maximum: 5041.977
  • Minimum: 0.267
  • Precision: Not specified
  • Missing values:
    • NULL = None given
Cl (mM)
  • Label:
  • Definition: Dissolved chloride in millimoles per liter
  • Type: Physical quantity
  • Unit: mM
  • Maximum: 18178.8
  • Minimum: 0.16
  • Precision: Not specified
  • Missing values:
    • NULL = None given
129I/I(E-15)
  • Label:
  • Definition: Molar ratio of I-129 to total iodine (10^-15)
  • Type: Physical quantity
  • Unit: dimensionless
  • Maximum: 2163
  • Minimum: 445
  • Precision: Not specified
  • Missing values:
    • NULL = None given
+/-129I/I(E-15)
  • Label:
  • Definition: 1-sigma error in molar ratios of I-129/I-127 (10^-15)
  • Type: Physical quantity
  • Unit: dimensionless
  • Maximum: 612.65
  • Minimum: 44.86
  • Precision: Not specified
  • Missing values:
    • NULL = None given
129I(at/uL)
  • Label:
  • Definition: Concentration of I-129 in atoms per microliter
  • Type: Physical quantity
  • Unit: at/uL
  • Maximum: 0.823
  • Minimum: 0.0416
  • Precision: Not specified
  • Missing values:
    • NULL = None given
+/-129I(at/uL)
  • Label:
  • Definition: 1-sigma error for I-129 concentration
  • Type: Physical quantity
  • Unit: dimensionless
  • Maximum: 0.0032
  • Minimum: 0.2290
  • Precision: Not specified
  • Missing values:
    • NULL = None given
36Cl/Cl(E-15)
  • Label:
  • Definition: Molar ratio of Cl-36 to Cl-37 (10^-15)
  • Type: Physical quantity
  • Unit: dimensionless
  • Maximum: 6.36
  • Minimum: 0.93
  • Precision: Not specified
  • Missing values:
    • NULL = None given
+/-36Cl/Cl(E-15)
  • Label:
  • Definition: 1-sigma error in molar ratios of Cl-36/Cl-37 (10^-15)
  • Type: Physical quantity
  • Unit: dimensionless
  • Maximum: 17.95
  • Minimum: 0.93
  • Precision: Not specified
  • Missing values:
    • NULL = None given
36Cl(at/uL)
  • Label:
  • Definition: Concentration of Cl-36 in atoms per microliter
  • Type: Physical quantity
  • Unit: at/uL
  • Maximum: 1.0
  • Minimum: 0.0
  • Precision: Not specified
  • Missing values:
    • NULL = None given
+/-36Cl/Cl(at/uL)
  • Label:
  • Definition: 1-sigma error for 36Cl concentration
  • Type: Physical quantity
  • Unit: dimensionless
  • Maximum: 1.0
  • Minimum: 0.0
  • Precision: Not specified
  • Missing values:
    • NULL = None given
DEPTH MASL
  • Label:
  • Definition: Depth referred to the Sea level. Distance below Mean Average Sea water level reference from which sample was drawn
  • Type: Physical quantity
  • Unit: meter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: 1
  • Missing values: None specified

DOI: 

10.6073/pasta/e17a396ff4a5e513b1e93ae7585e6125

Short name: 

snyder_halogenchem

Data set ID: 

6001
People

Owner/Creator: 

Contact: 

Additional Project roles: 

Data Manager
Data Manager