On Monday, 11 July from 3:00 p.m. through Wednesday, 13 July until 5:00 p.m. (USA Mountain Time), NSIDC data distribution, services, and Web site will be unavailable to accommodate a major upgrade to our data center. We apologize for any inconvenience this may cause you. Need to talk to us? You can always contact our friendly User Services Office at firstname.lastname@example.org or + 1 303.492.6199.
This data set measures the radioactive decay of nuclear material from nuclear testing that drifted over the continent. Firn cores were taken from three locations on Roosevelt Island, an ice dome within the Ross Ice Shelf, and were measured at increasing depth for density in kilograms per cubic meter, and for beta counts per hour per kilogram.
The data were collected between November and December of 1997. Measurements were taken incrementally down to approximately 17 meters for each of the three cores. Data are available in text format via ftp.
Conway, H. 1998. Roosevelt Island Ice Core Density and Beta Count Data. Boulder, CO: National Snow and Ice Data Center. http://dx.doi.org/10.7265/N55718ZW.
|Data format||Text files|
|Spatial coverage and resolution||Roosevelt Island on the Ross Ice Shelf|
|Temporal coverage and resolution||November and December, 1997|
|Tools for accessing data||No special tools required|
|File naming convention||Files are named by their pole location: a000.txt, a210.txt, aw35.txt|
|File size||11 Kb, combined|
|Parameter(s)||beta counts, density|
|Procedures for obtaining data||Data are available via FTP.|
Howard Conway, Research Professor, University of Washington
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
Data are available in three text files.
Each file is named according to the location of the core: a000.txt, a210.txt, aw35.txt.
Each data file is 3 Kb.
Southernmost_Latitude: 79 34 18.37369 S
Northernmost_Latitude: 79 21 14.17633 S
Westernmost_Longitude: 161 34 00.24461 W
Easternmost_Longitude: 160 19 23.82155 W
Data were collected during November and December, 1997.
Snow density and beta counts were measured at the University of New Hampshire.
Snow density is measured in kilograms per cubic meter (kg/m3)
Beta counts are measured in counts per hour per kilogram (cts/hr/kg)
Each parameter was measured to a depth of approximately 17 m. Generally, two measurements for each parameter were taken at each depth. (See the sample below.)
|Depth Range (m)||Dens (kg/m3)||Beta (cts/hr/kg)|
|13.25 – 13.46||582||18|
|13.46 – 13.66||621||20.9|
|13.66 – 13.85||611||17.33|
Data are available via FTP.
Data are available at no cost.
Most browsers and word processing applications can open text files. No special software or tools are necessary.
The firn cores were collected during the field season of 1997. The density and beta count measurements were taken by Jack Dibb at the University of New Hampshire.
Conway, H., B.L. Hall, G.H. Denton, A.M. Gades, E.D. Waddington. 1999. Past and Future Grounding-Line Retreat of the West Antarctic Ice Sheet. Science 286:280-283
2 May 2003