Record details

Title
    Inferred gas hydrate and permafrost stability history models linked to climate change in the Beaufort-Mackenzie Basin, Arctic Canada
Author
    Majorowicz, J.
    Osadetz, K.
    Šafanda, Jan
Language
    anglicky
Publication type
    článek v odborném periodiku
Source title - serial
    Climate of the Past
Vol./nr.
    Roč. 8, č. 2
Pages
    s. 667-682
Year
    2012
Notes
    Rozsah: 16 s. : P
    Výzkumný záměr: CEZ:AV0Z30120515
Subject category
    Beaufort-Mackenzie Basin
    climate change
    permafrost
Keyword
    Arctic
    Basin
    Beaufort-Mackenzie
    Canada
    Change
    Climate
    Gas
    History
    Hydrate
    Inferred
    Linked
    Models
    Permafrost
    Stability
Abstract (in english)
   Atmospheric methane from episodic gas hydrate (GH) destabilization, the "clathrate gun" hypothesis, is proposed to affect past climates, possibly since the Phanerozoic began or earlier. In the terrestrial Beaufort-Mackenzie Basin (BMB), GHs occur commonly below thick ice-bearing permafrost (IBP), but they are rare within it. Two end-member GH models, where gas is either trapped conventionally (Case 1) or where it is trapped dynamically by GH formation (Case 2), were simulated using profile (1-D) models and a 14 Myr ground surface temperature (GST) history based on marine isotopic data, adjusted to the study setting, constrained by deep heat flow, sedimentary succession conductivity, and observed IBP and Type I GH contacts in Mallik wells. Models consider latent heat effects throughout the IBP and GH intervals.
Contributor
    AV ČR Brno, Geofyzikální ústav
Contributor code
    AV ČR, GFÚ
Source format
    U
Import date
    9. 12. 2013