This data set contains methane measurements made in trapped air in the Holocene sections of two ice cores: the Siple Dome ice core in Antarctica, and the Greenland Ice Sheet Project 2 (GISP2) ice core in Greenland. The measurements were made at Oregon State University between 2007 and 2009. Measurements were made relative to the NOAA04 methane concentration scale using a working standard internally calibrated to NOAA certified air standards. Concentrations are corrected for gravitational fractionation and solubility effects in the melt-refreeze extraction. Data are available via FTP in Microsoft Excel (.xls) format.
DOWNLOADING DATA VIA FTP
Data can be downloaded through a Web browser or command line via FTP. When using a Web browser, the FTP link first directs you to an Optional Registration Form that if filled out, will allow you to receive notifications about updates or processing changes related to that specific data set. After completing the Optional Registration Form, the FTP directory becomes available. For additional help downloading data through an FTP client, go to the How to access data using an FTP client support page.
Methane Measurements from the GISP2 and Siple Dome Ice Cores, Version 1
|Spatial Resolution:||Not Specified|
|Temporal Resolution:||Not specified|
|Platform(s)||DRILLING PLATFORMS, LABORATORY|
|Data Contributor(s):||Edward Brook|
|Metadata XML:||View Metadata Record|
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.Brook, E. J. 2009. Methane Measurements from the GISP2 and Siple Dome Ice Cores, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: http://dx.doi.org/10.7265/N58P5XFZ. [Date Accessed].
Detailed Data Description
Data are in Microsoft Excel (.
Data are available on the FTP site in the
ftp://sidads.colorado.edu/pub/DATASETS/AGDC/brook_nsidc_0440/ directory. Within this directory, there is one data file, and one readme file in text format (.
The data file,
Brook_Holocene_CH4.xls, contains methane data from the Holocene portion of the GISP2 and Siple Dome ice cores.
The total volume of the data set is 44 KB.
The file contains data from the Siple Dome ice core, drilled in Antarctica, and the GISP2 ice core, from Greenland. The geographic locations of the two ice cores are listed below:
Southernmost Latitude: 81.65° S
Northernmost Latitude: 81.65° S
Westernmost Longitude: 148.81° W
Easternmost Longitude: 148.81° W
Southernmost Latitude: 73.58° N
Northernmost Latitude: 73.58° N
Westernmost Longitude: 38.4° W
Easternmost Longitude: 38.4° W
Measurements were made between 2007 and 2009. The age range of the samples is 0 to 11.7 thousand years (ka) for GISP2 and 0 to 10.9 ka for Siple Dome.
Measurement depths range from 55.7 to 598.39 meters below the surface (mbs) for the Siple Dome ice core, and 95.98 to 1695.35 mbs for the GISP2 ice core.
The measurements contain depth in meters below surface, gas age in thousands of years (ka), and methane concentration, in parts per billion (ppb).
Sample Data Record
|GISP2 Ice Core||Siple Dome Ice Core|
Below Surface (m)
|Methane Concentration (ppb)||Meese/Sowers
Gas Age (ka)
|Mid Depth Below Surface (m)||Methane Concentration (ppb)||Gas Age (ka)
(Brook et al., 2005)
Software and Tools
Data are accessible using spreadsheet software.
Data Acquisition and Processing
Measurements were made relative to the NOAA04 methane concentration scale using a working standard internally clailbrated to NOAA certified air standards. Concentrations are corrected for gravitational fractionation and solubility effects in the melt-refreeze extraction. The time scale used was the GISP2: Mees/Sowers Time Scale. The method of construction of the Siple Dome time scale provided here is described in Brook et al., 2005.
References and Related Publications
Contacts and Acknowledgments
Dr. Edward Brook
Department of Geosciences
104 Wilkinson Hall
Oregon State University
Corvallis, OR 97330
This research was supported by National Science Foundation (NSF) Office of Polar Programs (OPP) grant number 0520523.
Document Creation Date
8 December 2009