| Abstract: | This paper provides an updated technical description of the USGS Polar Temperature Logging System (PTLS) and a complete assessment of the measurement uncertainties. This measurement system is used to acquire subsurface temperature data for climate-change detection in the polar regions and for reconstructing past climate changes using the ‘borehole paleothermometry‘ inverse method. Specifically designed for polar conditions, the PTLS can measure temperatures as low as -60 degrees Celsius with a sensitivity ranging from 0.02 to 0.19 millikelvin (mK). A modular design allows the PTLS to reach depths as great as 4.5 kilometers with a skid-mounted winch unit or 650 meters with a small helicopter-transportable unit. The standard uncertainty (uT) of the ITS-90 temperature measurements obtained with the current PTLS range from 3.0 mK at -60 degrees Celsius to 3.3 mK at 0 degrees Celsius. Relative temperature measurements used for borehole paleothermometry have a standard uncertainty (urT) whose upper limit ranges from 1.6 mK at -60 degrees Celsius to 2.0 mK at 0 degrees Celsius. The uncertainty of a temperature sensor‘s depth during a log depends on specific borehole conditions and the temperature near the winch and thus must be treated on a case-by-case basis. However, recent experience indicates that when logging conditions are favorable, the 4.5-kilometer system is capable of producing depths with a standard uncertainty (uZ) on the order of 200-250 parts per million. |
| Genre: | USGS Numbered Series |
| ProdID: | 86258 |
| Citation Author: | Clow, Gary D. |
| Citation Contributing Office: | USGS Rocky Mountain Geographic Science Center |
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| Citation Edition: | Version 1.0 |
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| Citation Language: | ENGLISH |
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| Citation Online Only Flag: | Y |
| Citation Phsyical Description: | iv, 25 p. |
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| Citation Publisher: | Geological Survey (U.S.) |
| Citation Series: | Techniques and Methods |
| Citation Series Code: | TM |
| Citation Series Number: | 2-E3 |
| Citation Search Results Text: | USGS Polar Temperature Logging System, Description and Measurement Uncertainties; 2008; TM; 2-E3; Clow, Gary D. |
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| Citation Year: | 2008 |
| Type: | citation/reference |
| Text: | USGS Polar Temperature Logging System, Description and Measurement Uncertainties; 2008; TM; 2-E3; Clow, Gary D. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/tm_2_e3.gif |
| URL (INDEX PAGE): | http://pubs.usgs.gov/tm/02e03/ |
| Date Other: | Sat, 27 Sep 2008 00:00 -0500 |
| Publisher: | Geological Survey (U.S.) |
