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

Summary

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.

Citing These Data

Thiemens, M. H., and J. Savarino. 2006. Atmospheric nitrate isotopic analysis at Amundsen-Scott South Pole Station, a twenty-five year record . Boulder, Colorado USA: National Snow and Ice Data Center. http://dx.doi.org/10.7265/N5TT4NWF.

The following example shows how to cite the use of this data set in a publication. For more information, see our Use and Copyright Web page.

Overview Table

Category Description
Data format Microsoft Excel (.xls)
Spatial coverage and resolution

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

6-meter snow pit at Amundsen-Scott South Pole Station

Temporal coverage and resolution The 6-meter snow pit provides a 25-year record of nitrate isotope variations and ion concentrations. Investigators also collected monthly surface snow and weekly aerosol data from 01 December 2003 to 31 December 2004.
Tools for accessing data Spreadsheet software
File size Approximately 76.5 KB
Parameters Concentrations of methanesulphonic acid (MSA, CH3SO3H), chlorine (Cl), nitrate (NO3), sulfate (SO4), sodium (Na), ammonium (NH4), potassium(K), magnesium(Mg), calcium (Ca), and oxygen isotope composition of nitrate
Procedures for obtaining data Data are available via FTP.

Table of Contents

1. Contacts and Acknowledgments
2. Detailed Data Description
3. Data Access and Tools
4. References and Related Publications
5. Document Information

1. Contacts and Acknowledgments

Investigators

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

Technical Contact

NSIDC User Services
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
Boulder, CO 80309-0449  USA
phone: +1 303.492.6199
fax: +1 303.492.2468
form: Contact NSIDC User Services
e-mail: nsidc@nsidc.org

Acknowledgements

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

2. 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

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

Temporal Coverage and Resolution

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.

Parameters

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)
d18O
d17O
D17O
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

3. Data Access and Tools

Data Access

Data are available via FTP.

Software and Tools

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

Related Data Collections

4. References and Related Publications

McCabe, J. R., J. Savarino, and M. H. Thiemens. 2005. Isotopic analysis of nitrate in South Pole snow and air. Eos. Trans. AGU 86(52). Fall Meeting Suppl., Abstract A13F-04.

5. Document Information

Acronyms and Abbreviations

The following acronyms and abbreviations are used in this document:

AGDC Antarctic Glaciological Data Center
FTP File Transfer Protocol
MSA Methanesulphonic acid
NSF National Science Foundation
NSIDC National Snow and Ice Data Center
OPP Office of Polar Programs
ppb Parts per billion
URL Uniform Resource Locator

Document Creation Date

October 2006

Document URL

http://nsidc.org/data/docs/agdc/nsidc0281_thiemens/index.html