Iodine content and I-129 isotopic composition in McMurdo lake-bottom sediments

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 is the total iodine content and I-129 isotopic composition of lake-bottom sediments from Lakes Joyce and Fryxell. An attempt was made to determine the  iodine and chlorine isotopic content  of gypsum cored from the bottom of Lake Vanda, but the total iodine content was below detection.
            

Date Range: 

December 21, 2005 to December 27, 2005
Data Citation
Snyder, G., Lyons, W. 2014. McMurdo Dry Valleys LTER: Iodine content and I-129 isotopic composition in McMurdo lake-bottom sediments. Environmental Data Initiative. DOI: 10.6073/pasta/9f0a7a162d54f9db5113426eb2ccd0c3. Dataset accessed 20 October 2019.
Dataset(s)

Description: 

This is the description of the spreadsheet fo the iodine study, with columns description and units used

Variables (click to expand): 

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:
  • Definition: Average sediment depth in centimeters below the lake floo
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • Null = None given
I(umol/kg)
  • Label:
  • Definition: Total sedimentary iodine content in micromoles per kilogram
  • Type: Physical quantity
  • Unit: umol/kg
  • Maximum: 545
  • Minimum: 2.32
  • 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
129I/I(E-15)
  • Label:
  • Definition: Molar ratio of I-129 to total iodine (10^-15)
  • Type: Physical quantity
  • Unit: dimensionless
  • Maximum: 12929
  • Minimum: 216
  • 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: 3454
  • Minimum: 49.02
  • 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: 142.7
  • Minimum: 0.39
  • 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: 38.07
  • Minimum: 0.09
  • Precision: Not specified
  • Missing values:
    • NULL = None given

File: 

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

Short name: 

snyder_iodinesed

Dataset ID: 

6002
People

Principal Investigator(s): 

Contact: 

Associated Personnel: 

Data Manager
Data Manager