This data set includes borehole temperature measurements performed in January 2008 and January 2009 at the West Antarctic Ice sheet divide from the 300 m hole WDC05A.
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Borehole Temperature Measurement in WDC05A in January 2008 and January 2009, Version 1
Geographic Coverage
Spatial Coverage: |
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Spatial Resolution: | Not Specified |
Temporal Coverage: |
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Temporal Resolution: | 1 day |
Parameter(s): |
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Platform(s) | GROUND-BASED OBSERVATIONS |
Sensor(s): | THERMISTORS |
Data Format(s): |
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Version: | V1 |
Data Contributor(s): | Jeffrey Severinghaus, Anais Orsi |
Metadata XML: | View Metadata Record |
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.
Orsi, A. J. and J. P. Severinghaus. 2015. Borehole Temperature Measurement in WDC05A in January 2008 and January 2009, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: http://dx.doi.org/10.7265/N5B27S7S. [Date Accessed].Literature Citation
As a condition of using these data, we request that you acknowledge the author(s) of this data set by referencing the following peer-reviewed publication.
Orsi, A. J., J. P. Severinghaus, et al. 2012. Little Ice Age Cold Interval in West Antarctica: Evidence from Borehole Temperature at the West Antarctic Ice Sheet (WAIS) Divide, Geophysical Research Letters. 39. . http://dx.doi.org/10.1029/2012GL051260
Detailed Data Description
Data include temperature measurements every 5 meters, from 10 to 300 m, with replicate measurements every 10 m. The depth is given with reference to the 2009 surface. The thermistor resistance is given, as well as the inferred temperature. The pooled standard deviation of these temperature measurements is 1.5 mK below 20 m.
Data are provided in tab-limited ASCII format.
Data are available on the FTP site in the ftp://sidads.colorado.edu/pub/DATASETS/AGDC/nsidc0637_severinghaus/
directory. Within this directory, there are two files:
WDC05A_BoreholeTemp_300m_2008.txt
, for WAIS divide Borehole temperature record measured in January 2008.WDC05A_BoreholeTemp_300m_2009.txt
, for WAIS divide Borehole temperature record measured in January 2009.
The data files total approximately 7 KB.
West Antarctic Ice Sheet Divide ice core. WAIS Divide is situated 24 km west of the Ross–Amundsen ice flow divide and 160 km east of the Byrd ice core site.
79.463° South, 112.125° West
Surface elevation at drill site: 1766 m.
Spatial Resolution
Depth resolution is 5 m.
Temporal coverage of this data set is from 1000 to 2007 C.E.
Temporal Resolution
Single day measurements in January 2008 and January 2009.
Parameter Description
Table 1 describes the borehole data parameters.
Parameter | Description | Units |
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Depth | Depth below the surface | Meters |
Resistance | Resistance of the thermistor probe | KOhms |
Temp | Borehole temperature | Degrees C |
Software and Tools
The data file can be opened using any software capable of reading ASCII text files.
Data Acquisition and Processing
Data were collected using a Omega 44033 thermistor with Fluke 8846A multimeter. In the field, the sensor was held stationary every 5 meters to equilibrate with the surrounding temperature for 20 min, and the resistance was integrated over 5 min. Logging was done both upwards and downwards, with two or three measurements at each depth (Orsi et al. 2012).
Calibration from Resistance in Ohms to temperature using the Steinhart-Hart Equation.
Data represent the average between duplicates or triplicates when available.
A single Omega 44033 thermistor was connected to a Fluke 8846A precision multimeter using the 4-wire measurement method. The thermistor was calibrated at Scripps Institution of Oceanography against a secondary reference temperature standard, according to the Steinhart-Hart equation. The accuracy of the absolute temperature of this calibration is 0.1 K, and its relative uncertainty in the range of our borehole measurements is 0.0023 K (Orsi et al. 2012).
References and Related Publications
Contacts and Acknowledgments
Anais J. Orsi and Jeffrey P. Severinghaus
Scripps Institution of Oceanography
Geoscience research division #0244
9500 Gilman Drive
La Jolla, CA 92093-0244
NSF Grant Title: Nitrogen and Oxygen Gas Isotopes in the WAIS Divide Ice Core as Constraints on Chronology, Temperature, and Accumulation Rate. NSF Grant Numbers: 04-40701 and 05-38657.
Document Information
Document Creation Date
04 June 2015
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