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Marine heat flow measurements across subsea permafrost limit in the eastern Mackenzie Trough, Canadian Beaufort Sea

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Title
Marine heat flow measurements across subsea permafrost limit in the eastern Mackenzie Trough, Canadian Beaufort Sea
Other Titles
캐나다 보퍼트해 동편 맥켄지 트러프에서 해양 영구동토층을 가로지르는 해양지열관측
Authors
Hong, Jong Kuk
Kim, Young-Gyun
Keywords
Araon; Beaufort Sea; Mackenzie Trough; Marine heat flow; Subsea permafrost
Issue Date
2015
Citation
Hong, Jong Kuk, Kim, Young-Gyun. 2015. Marine heat flow measurements across subsea permafrost limit in the eastern Mackenzie Trough, Canadian Beaufort Sea. 2015 AGU Fall meeting. Moscone Center. 2015.12.14~2015.12.18.
Abstract
Marine heat flow measurements using a 5 m-long Ewing-type heat probe were made during Korean icebreaker R/V Araon’s Arctic expeditions (ARA04C in 2013 and ARA05B in 2014) to better know the shallow subsurface thermal structure in the eastern slope of Mackenzie Trough, the Canadian Beaufort Sea, in which associative geological processes of permafrost degradation and gas hydrate dissociation occur because of long-term warming since the Last Glacial Maximum. Heat flow in the continental slope was collected for the first time and is rather higher than those from deep boreholes (up to a few km below the seafloor) in the continental shelf. However, the smaller geothermal gradient and thermal conductivity were observed from sites along a transect line across permafrost limit on the eastern slope of the trough. It is noted that geothermal gradients are relatively constant in the vicinity of permafrost limit but are much smaller (even minus) only at deeper depths with positive bottom water temperature. Reason for such distribution is unclear yet. Based on observed geothermal gradient and bottom water temperature, permafrost table shown in subbottom profile seems to be controlled not by temperature. On the other hand, our finding of permafrost evidence on the other subbottom profile located landward may support that permafrost limit in the trough is along with ~100 m isobath.
URI
http://repository.kopri.re.kr/handle/201206/7120
Conference Name
2015 AGU Fall meeting
Conference Place
Moscone Center
Conference Date
2015.12.14~2015.12.18
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