Non-contact infrared temperature measurements in dry permafrost boreholes
While planning the COAST Expedition to the Siberian Laptev Sea in 2005, the question of how to make a short equilibrium temperature measurement in a dry borehole arose. As a result, an infrared borehole tool was developed and used in three dry boreholes (up to 60.2 m deep) in the coastal transition...
Published in: | Journal of Geophysical Research |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
AGU (American Geophysical Union)
2008
|
Subjects: | |
Online Access: | https://oceanrep.geomar.de/id/eprint/27406/ https://oceanrep.geomar.de/id/eprint/27406/1/2008_Junker-etal-Non-contact_JGRB-113.pdf https://doi.org/10.1029/2007JB004946 |
id |
ftoceanrep:oai:oceanrep.geomar.de:27406 |
---|---|
record_format |
openpolar |
spelling |
ftoceanrep:oai:oceanrep.geomar.de:27406 2023-05-15T16:37:26+02:00 Non-contact infrared temperature measurements in dry permafrost boreholes Junker, Ralf Grigoriev, Mikhail N. Kaul, Norbert 2008 text https://oceanrep.geomar.de/id/eprint/27406/ https://oceanrep.geomar.de/id/eprint/27406/1/2008_Junker-etal-Non-contact_JGRB-113.pdf https://doi.org/10.1029/2007JB004946 en eng AGU (American Geophysical Union) https://oceanrep.geomar.de/id/eprint/27406/1/2008_Junker-etal-Non-contact_JGRB-113.pdf Junker, R., Grigoriev, M. N. and Kaul, N. (2008) Non-contact infrared temperature measurements in dry permafrost boreholes. Journal of Geophysical Research - Solid Earth, 113 . B04102. DOI 10.1029/2007JB004946 <https://doi.org/10.1029/2007JB004946>. doi:10.1029/2007JB004946 cc_by_nc Article PeerReviewed 2008 ftoceanrep https://doi.org/10.1029/2007JB004946 2023-04-07T15:17:31Z While planning the COAST Expedition to the Siberian Laptev Sea in 2005, the question of how to make a short equilibrium temperature measurement in a dry borehole arose. As a result, an infrared borehole tool was developed and used in three dry boreholes (up to 60.2 m deep) in the coastal transition zone from terrestrial to sub-sea permafrost near Mamontovy Klyk in the western Laptev Sea. A depth versus temperature profile was acquired with equilibration times of 50 × 10−3 s at each depth interval. Comparison with a common resistor string revealed an offset due to limitations of accuracy of the infrared technique and the influence of the probe's massive steel housing. Therefore it was necessary to calibrate the infrared sensor with a high precision temperature logger in each borehole. The results of the temperature measurements show a highly dynamic transition zone with temperature gradients up to −0.092°C/m and heat flow of −218 mW/m. A period of submergence of only 600 years the drilled sub-sea permafrost is approaching the overlying seawater temperature at −1.61°C with a temperature gradient of 0.021°C/m and heat flow of 49 mW/m. Further offshore, 11 km from the coastline, a temperature gradient of 0.006°C/m and heat flow of 14 mW/m occur. Thus the sub-sea permafrost in the Mamontovy Klyk region has reached a critical temperature for the presence of interstitial ice. The aim of this article is to give a brief feasibility study of infrared downhole temperature measurements and to present experiences and results of its successful application. Article in Journal/Newspaper Ice laptev Laptev Sea permafrost OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Laptev Sea Journal of Geophysical Research 113 B4 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
While planning the COAST Expedition to the Siberian Laptev Sea in 2005, the question of how to make a short equilibrium temperature measurement in a dry borehole arose. As a result, an infrared borehole tool was developed and used in three dry boreholes (up to 60.2 m deep) in the coastal transition zone from terrestrial to sub-sea permafrost near Mamontovy Klyk in the western Laptev Sea. A depth versus temperature profile was acquired with equilibration times of 50 × 10−3 s at each depth interval. Comparison with a common resistor string revealed an offset due to limitations of accuracy of the infrared technique and the influence of the probe's massive steel housing. Therefore it was necessary to calibrate the infrared sensor with a high precision temperature logger in each borehole. The results of the temperature measurements show a highly dynamic transition zone with temperature gradients up to −0.092°C/m and heat flow of −218 mW/m. A period of submergence of only 600 years the drilled sub-sea permafrost is approaching the overlying seawater temperature at −1.61°C with a temperature gradient of 0.021°C/m and heat flow of 49 mW/m. Further offshore, 11 km from the coastline, a temperature gradient of 0.006°C/m and heat flow of 14 mW/m occur. Thus the sub-sea permafrost in the Mamontovy Klyk region has reached a critical temperature for the presence of interstitial ice. The aim of this article is to give a brief feasibility study of infrared downhole temperature measurements and to present experiences and results of its successful application. |
format |
Article in Journal/Newspaper |
author |
Junker, Ralf Grigoriev, Mikhail N. Kaul, Norbert |
spellingShingle |
Junker, Ralf Grigoriev, Mikhail N. Kaul, Norbert Non-contact infrared temperature measurements in dry permafrost boreholes |
author_facet |
Junker, Ralf Grigoriev, Mikhail N. Kaul, Norbert |
author_sort |
Junker, Ralf |
title |
Non-contact infrared temperature measurements in dry permafrost boreholes |
title_short |
Non-contact infrared temperature measurements in dry permafrost boreholes |
title_full |
Non-contact infrared temperature measurements in dry permafrost boreholes |
title_fullStr |
Non-contact infrared temperature measurements in dry permafrost boreholes |
title_full_unstemmed |
Non-contact infrared temperature measurements in dry permafrost boreholes |
title_sort |
non-contact infrared temperature measurements in dry permafrost boreholes |
publisher |
AGU (American Geophysical Union) |
publishDate |
2008 |
url |
https://oceanrep.geomar.de/id/eprint/27406/ https://oceanrep.geomar.de/id/eprint/27406/1/2008_Junker-etal-Non-contact_JGRB-113.pdf https://doi.org/10.1029/2007JB004946 |
geographic |
Laptev Sea |
geographic_facet |
Laptev Sea |
genre |
Ice laptev Laptev Sea permafrost |
genre_facet |
Ice laptev Laptev Sea permafrost |
op_relation |
https://oceanrep.geomar.de/id/eprint/27406/1/2008_Junker-etal-Non-contact_JGRB-113.pdf Junker, R., Grigoriev, M. N. and Kaul, N. (2008) Non-contact infrared temperature measurements in dry permafrost boreholes. Journal of Geophysical Research - Solid Earth, 113 . B04102. DOI 10.1029/2007JB004946 <https://doi.org/10.1029/2007JB004946>. doi:10.1029/2007JB004946 |
op_rights |
cc_by_nc |
op_doi |
https://doi.org/10.1029/2007JB004946 |
container_title |
Journal of Geophysical Research |
container_volume |
113 |
container_issue |
B4 |
_version_ |
1766027728744611840 |