Regional climate change signals inferred from a borehole temperature profile in Muli, Qilian Mountain, using the Tikhonov method
Within the gas hydrate drilling project in the Qilian Mountain permafrost region, a temperature–depth profile measured from borehole DK-12 in Juhugeng of Muri Coalfield, Tianjun County, Qinghai Province, China, was analyzed to infer recent climate changes. The long-term surface temperature and therm...
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doaj-88aa1fdd93dd4e3691ec625ad43518c02021-02-08T14:09:12ZengTaylor & Francis GroupArctic, Antarctic, and Alpine Research1523-04301938-42462020-01-0152145046010.1080/15230430.2020.18011491801149Regional climate change signals inferred from a borehole temperature profile in Muli, Qilian Mountain, using the Tikhonov methodJia Liu0Guanli Jiang1Qingbai Wu2Tingjun Zhang3Siru Gao4China Geological SurveyChina Geological SurveyNorthwest Institute of Eco-Environment and Resources, Chinese Academy of SciencesLanzhou UniversityNorthwest Institute of Eco-Environment and Resources, Chinese Academy of SciencesWithin the gas hydrate drilling project in the Qilian Mountain permafrost region, a temperature–depth profile measured from borehole DK-12 in Juhugeng of Muri Coalfield, Tianjun County, Qinghai Province, China, was analyzed to infer recent climate changes. The long-term surface temperature and thermal gradient were retrieved from borehole temperature measurements. The ground surface temperature (GST) changes were reconstructed by inversion of transient temperature perturbations through solving an inverse heat conduction problem using the Tikhonov method. Based on the instability of this kind of inverse problem and the nature of method-dependent features of borehole paleothermometry, we initially applied the Tikhonov regularization technique to obtain a stable past GST variation pattern with relatively low resolution. The inversion results showed that this region experienced temperature fluctuation with a total warming of 3°C (±1.6°C) from 1400 to the 2010s and a more exacerbated warming starting from the 1960s. The GST trend fit the surface air temperature observation trend from the nearest Yeniugou meteorological station. This work fills the gap created by limited meteorological records in the Muli area and extends knowledge of ground surface temperature trends going back more than ten centuries.http://dx.doi.org/10.1080/15230430.2020.1801149borehole paleothermometrygeothermal gradientpermafrosttikhonov regularization |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jia Liu Guanli Jiang Qingbai Wu Tingjun Zhang Siru Gao |
spellingShingle |
Jia Liu Guanli Jiang Qingbai Wu Tingjun Zhang Siru Gao Regional climate change signals inferred from a borehole temperature profile in Muli, Qilian Mountain, using the Tikhonov method Arctic, Antarctic, and Alpine Research borehole paleothermometry geothermal gradient permafrost tikhonov regularization |
author_facet |
Jia Liu Guanli Jiang Qingbai Wu Tingjun Zhang Siru Gao |
author_sort |
Jia Liu |
title |
Regional climate change signals inferred from a borehole temperature profile in Muli, Qilian Mountain, using the Tikhonov method |
title_short |
Regional climate change signals inferred from a borehole temperature profile in Muli, Qilian Mountain, using the Tikhonov method |
title_full |
Regional climate change signals inferred from a borehole temperature profile in Muli, Qilian Mountain, using the Tikhonov method |
title_fullStr |
Regional climate change signals inferred from a borehole temperature profile in Muli, Qilian Mountain, using the Tikhonov method |
title_full_unstemmed |
Regional climate change signals inferred from a borehole temperature profile in Muli, Qilian Mountain, using the Tikhonov method |
title_sort |
regional climate change signals inferred from a borehole temperature profile in muli, qilian mountain, using the tikhonov method |
publisher |
Taylor & Francis Group |
series |
Arctic, Antarctic, and Alpine Research |
issn |
1523-0430 1938-4246 |
publishDate |
2020-01-01 |
description |
Within the gas hydrate drilling project in the Qilian Mountain permafrost region, a temperature–depth profile measured from borehole DK-12 in Juhugeng of Muri Coalfield, Tianjun County, Qinghai Province, China, was analyzed to infer recent climate changes. The long-term surface temperature and thermal gradient were retrieved from borehole temperature measurements. The ground surface temperature (GST) changes were reconstructed by inversion of transient temperature perturbations through solving an inverse heat conduction problem using the Tikhonov method. Based on the instability of this kind of inverse problem and the nature of method-dependent features of borehole paleothermometry, we initially applied the Tikhonov regularization technique to obtain a stable past GST variation pattern with relatively low resolution. The inversion results showed that this region experienced temperature fluctuation with a total warming of 3°C (±1.6°C) from 1400 to the 2010s and a more exacerbated warming starting from the 1960s. The GST trend fit the surface air temperature observation trend from the nearest Yeniugou meteorological station. This work fills the gap created by limited meteorological records in the Muli area and extends knowledge of ground surface temperature trends going back more than ten centuries. |
topic |
borehole paleothermometry geothermal gradient permafrost tikhonov regularization |
url |
http://dx.doi.org/10.1080/15230430.2020.1801149 |
work_keys_str_mv |
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