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Dominion Ice Core Data Readme
These are the data sets available for the Dominion Range
Data Fields
-999 indicates no data
-888 indicates sample below the level of detection
Precision is the average of the coefficient of variations calculated for each pair of duplicate aliquots analyzed.
pit_6m_chem.txt:
Top depth, meters
Bottom depth, meters;
Chloride (Cl), micrograms per liter; precision 3%
Nitrate (NO3), micrograms/L; precison 3%
Sulfate (SO4), micrograms/L; precision 3%
Sodium (Na) by AAS, micrograms/L; precision 20%
Sodium (Na) by IC, micrograms/L; precision 3%
Potassium (K) by IC, micrograms/L; precision 4%
Magnesium (Mg) by IC, micrograms/L; precision 3%
Calcium (Ca) by IC, micrograms/L; precision 9%
Oxygen isotopes (18O), standard per mil notation
Date, fraction of year;
pit_6m_beta.txt:
Top, meters;
Bottom, meters;
Counts per hour per kilogram
pit_6m_density.txt:
Depth, meter
Density, grams per centimeter cubed
pit_dr3s_density.txt:
Top, meters;
Bottom, meters;
Density, grams per centimeter cubed
pit_dr3s_chem.txt
Top depth, meters;
Bottom depth, meters;
Sodium (Na) by AAS, micrograms/L; precision 20%
Chloride (Cl), micrograms per liter; precision 3%
Nitrate (NO3), micrograms/L; precison 3%
Sulfate (SO4), micrograms/L; precision 3%
pit_dr5_chem.txt:
Top depth, meters;
Bottom depth, meters;
Sodium (Na) by AAS, micrograms/L; precision 20%
Chloride (Cl), micrograms per liter; precision 3%
Nitrate (NO3), micrograms/L; precison 3%
Sulfate (SO4), micrograms/L; precision 3 %
Density, grams per centimeter cubed
pit_dr7_chem.txt:
Top depth, meters;
Bottom depth, meters;
Sodium (Na) by AAS, micrograms/L; precision 20%
Chloride (Cl), micrograms per liter; precision 3%
Nitrate (NO3), micrograms/L; precison 3%
Sulfate (SO4), micrograms/L; precision 3%
Density, grams per centimeter cubed
pit_dr3n_chem.txt:
Top depth, meters;
Bottom depth, meters;
Sodium (Na) by AAS, micrograms/L; precision 20%
Chloride (Cl), micrograms per liter; precision 3%
Nitrate (NO3), micrograms/L; precison 3%
Sulfate (SO4), micrograms/L; precision 3%
pit_dr3n_density.txt:
Top, meters;
Bottom, meters;
Density, grams per centimeter cubed
pb210_data.txt:
Top, meters;
Bottom, meters;
Pb-210 Activity, dissintegrations per minute per kilogram (dpm/Kg);
Sigma, one sigma uncertainty, dpm/Kg
core_18o.txt:
Top depth, meters;
Bottom depth, meters;
Oxygen isotopes (18O), standard per mil notation
core_84_chem.txt:
Top depth, meters;
Bottom depth, meters;
Chloride (Cl), micrograms per liter; precision 1%
Nitrate (NO3), micrograms/L; precison 2%
Sulfate (SO4), micrograms/L; precision 2%
Sodium (Na) by AAS, micrograms/L; precision 20%
core_chem.txt:
Top depth, meters;
Bottom depth, meters;
Sodium (Na), micrograms/liter; precision 2% to 20%*
Ammonium (NH4), micrograms/L; precision 5 %
Potassium (K), micrograms/L; precision 4 %
Magnesium (Mg), micrograms/L; precision 3%
Calcium (Ca), micrograms/L; precision 4%
Chloride (Cl), micrograms/L; precision 2%
Nitrate (NO3), micrograms/L; precision 3%
Sulfate (SO4), micrograms/L; precision 3%
MSA (methanesulfonic acid), micrograms/L; precison 15%
Particles, total number of particles per milliliter between 0.7 micrometers and 11.3 micrometers (size based on the assumption that the particles are spherical).
General comments on the core chemistry data
The data for the Core_CHEM is a melding of the 20 cm sections processed in 1991 and averaged values from the 1984-5 processing, including the 6 meter snow pit. This the data set used to generate the figures in the Antarcitc Research Series paper. The firn samples in 1984 were processed with a lexan saw, the ice samples were rinsed with super pure water and melted in precleaned containers. The samples processed in 1991 were cleaned using a routering system developed by Mark Twickler and melted in precleaned containers. The 1991 samples were analyzed the same day the samples were melted. It should be emphasized Na values analyzed by flameless atomic absorption spectrophotometry are probably total Na values whereas the Na values from ion chromatography analysis are for soluable Na (i.e. whatever dissolves when the sample is melted and dissolves in the acidic eluent used for cation IC analysis).
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Last Updated Thursday, 22-Dec-2005 13:35:58 EST by paleo@noaa.gov
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