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Data Set ID:
NSIDC-0281

Atmospheric Nitrate Isotopic Analysis at Amundsen-Scott South Pole Station, A Twenty-Five Year Record, Version 1

This data set contains snow pit measurements of oxygen isotopes, 17O and 18O, in nitrate and ion concentrations, and surface measurements of oxygen isotopes in nitrate and in nitrate aerosols from the Amundsen-Scott South Pole Station, Antarctica. The 6-meter snow pit provides investigators with a 25-year record of nitrate isotope variations and ion concentrations for a period spanning from 1979 to 2004. Monthly surface snow and weekly aerosol collections yield a year-long record of nitrate isotopic composition starting 01 December 2003 and ending 31 December 2004.

Little is known about the past denitrification of the stratosphere in high latitude regions. Such knowledge is important to understanding the chemical state of the ancient atmospheres and evaluating the present climate models. With this research, investigators aim to understand the denitrification of the Antarctic stratosphere and quantify the sources of nitrate aerosols over time.

Data are in Microsoft Excel format and are available via FTP.

Geographic Coverage

Spatial Coverage:
  • N: -89.9975, S: -89.9975, E: 139.2728, W: 139.2728

Spatial Resolution: Not Specified
Temporal Coverage:
  • 1 December 2003 to 31 December 2004
Temporal Resolution: 300 month
Parameter(s):
  • Snow/Ice > Snow/Ice Chemistry > Ammonium
  • Snow/Ice > Snow/Ice Chemistry > Calcium
  • Snow/Ice > Snow/Ice Chemistry > Chlorine
  • Snow/Ice > Snow/Ice Chemistry > Magnesium
  • Snow/Ice > Snow/Ice Chemistry > Methanesulphonic Acid (MSA)
  • Snow/Ice > Snow/Ice Chemistry > Nitrate
Platform(s) GROUND STATIONS, GROUND-BASED OBSERVATIONS
Sensor(s): MASS SPECTROMETERS
Data Format(s):
  • Microsoft Excel
Version: V1
Data Contributor(s): Mark Thiemens, Joel Savarino

Data Citation

As a condition of using these data, you must cite the use of this data set using the following citation. For more information, see our Use and Copyright Web page.

Thiemens, M. H. and J. Savarino. 2006. Atmospheric Nitrate Isotopic Analysis at Amundsen-Scott South Pole Station, A Twenty-Five Year Record, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: http://dx.doi.org/10.7265/N5TT4NWF. [Date Accessed].

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Detailed Data Description

File Structure

The data file thiemensnsfdata.xls, which is in spreadsheet format, includes four data records. Each record is reported on an individual worksheet. The following outlines the content and structure of each worksheet.

Ions

This worksheet contains ion concentrations measurements from the snow pit indexed by depth.

Column Title Description
depth(cm) Depth of the sample in the snow pit
MSA(ppb) Methanesulphonic acid (MSA, CH3SO3H) concentration measured in parts per billion
Cl(ppb) Chlorine concentration measured in parts per billion
NO3(ppb) Nitrate concentration measured in parts per billion
SO4(ppb) Sulfate concentration measured in parts per billion
Na(ppb) Sodium concentration measured in parts per billion
NH4(ppb) Ammonium concentration measured in parts per billion
K(ppb) Potassium concentration measured in parts per billion
Mg(ppb) Magnesium concentration measured in parts per billion
Ca(ppb) Calcium concentration measured in parts per billion

snow pit

This worksheet contains isotope composition measurements from the snow pit indexed by depth.

Column Title Description
start depth (cm) Beginning depth of the sample section
end depth (cm) Ending depth of the sample section
δ18O Oxygen-18 isotopic composition of nitrate
δ17O Oxygen-17 isotopic composition of nitrate
Δ17O Oxygen-17 isotopic composition of nitrate corrected for fractionation

surface snow

This worksheet contains isotope composition measurements of surface snow indexed by date.

Column Title Description
Collection date Date the data were collected
δ18O Oxygen-18 isotopic composition of nitrate
δ17O Oxygen-17 isotopic composition of nitrate
Δ17O Oxygen-17 isotopic composition of nitrate corrected for fractionation

aerosols

This worksheet contains isotope composition measurements of nitrate aerosols indexed by date.

Column Title Description
Date (end) Ending date of sample collection
δ18O Oxygen-18 isotopic composition of nitrate
δ17O Oxygen-17 isotopic composition of nitrate
Δ17O Oxygen-17 isotopic composition of nitrate corrected for fractionation
 
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Spatial Coverage

Investigators collected these data from a 6-meter deep snow pit at Amundsen-Scott South Pole Station.

Southernmost Latitude: 89.9975 °S
Northernmost Latitude: 89.9975 °S
Westernmost Longitude: 139.2728 °E
Easternmost Longitude: 139.2728 °E

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Temporal Coverage

The data record for nitrate isotope variation and ion concentration measurements collected from the 6-meter snow pit spans from 1979 to 2004.

The data record for surface snow and aerosol measurements spans from 1 December 2003 to 31 December 2004.

Temporal Resolution

The snow pit data provide a 25-year record of chemical concentrations. During the observation period, investigators collected surface snow data monthly and aerosol data weekly.

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Parameter or Variable

Parameter Range

Worksheet/Tab Name Parameter Minimum Value Maximum Value
Ions depth(cm) 0 595
MSA(ppb) 0 49.0853
Cl(ppb) 7.8228 103.3823
NO3(ppb) 76.6474 422.3039
SO4(ppb) 21.4788 247.1091
Na(ppb) 1.9420 91.9473
NH4(ppb) 0 46.1160
K 0 42.5443
Mg(ppb) 0 11.5973
Ca(ppb) 0 113.0231
snow pit start depth (cm) 0 586
end depth (cm) 4 593
δ18O 11.5 78.9
δ17O 6.0 74.1
Δ17O 20.6 33.1
surface snow Collection date 12/20/2003 12/24/2004
δ18O 40.4 94.0
δ17O 46.7 83.6
Δ17O 25.0 34.7
aerosols Date (end) 12/13/2003 12/24/2004
δ18O 52.5 105.8
δ17O 49.9 93.1
Δ17O 22.6 38.1

Sample Data Record

The following sample data is from the aerosols worksheet. Investigators collected these data weekly.

Date (end)
δ18O
δ17O
Δ17O
12/13/2003
12/20/2003
52.5
49.9
22.6
12/27/2003
53.8
52.3
24.3
1/4/2004
1/10/2004
54.6
54.3
25.9
1/17/2004
61.9
57.9
25.7
1/24/2004
2/2/2004
2/8/2004
2/14/2004
70.2
61.3
24.8
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Software and Tools

Data can be viewed with Microsoft Excel or other spreadsheet software.

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Data Acquisition and Processing

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References and Related Publications

Contacts and Acknowledgments

Mark H. Thiemens
Department of Chemistry and Biochemistry 
University of California, San Diego 
9500 Gilman Drive, MC 0356
La Jolla, CA 92093-0356 USA

Joel Savarino
Laboratory of Glaciology and Geophysical Environment
54 rue Moliere, BP 96
St. Martin d Heres
38 402 France

Acknowledgements: 

This research was supported by the National Science Foundation (NSF) Office of Polar Programs (OPP) grant OPP-0125761.

Document Information

Document Creation Date

October 2006

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