Transient Freeze‐Thaw Deformation Responses to the 2018 and 2019 Fires Near Batagaika Megaslump, Northeast Siberia

Transient Freeze‐Thaw Deformation Responses to the 2018 and 2019 Fires Near Batagaika Megaslump, Northeast Siberia
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西伯利亚东北部巴塔盖卡巨型塌陷区附近 2018 年和 2019 年火灾的瞬态冻结-解冻变形响应

DOI:
10.1029/2022jf006817
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发表时间:
2023
期刊:
Journal of Geophysical Research: Earth Surface
影响因子:
--
通讯作者:
Iwahana, G.
Iwahana, G.
中科院分区:
--
文献类型:
--
作者:
Yanagiya, K.;Furuya, M.;Danilov, P.;Iwahana, G.

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北极地区的野火通过永久冻土退化和随后可能持续多年的变形影响地貌。然而,它仍然不确定是否以及有多少变形发生,以及是什么控制了它们的大小,特别是在最初的几年。在这里,我们研究了巴塔盖卡巨型块体附近的瞬态火灾后变形响应,巴塔盖卡巨型块体是萨哈共和国巴塔盖的世界上最大的退化融滑塌。2018年和2019年夏天,同一个斜坡上发生了野火,这可能会引发另一个巨型肿块的形成; 2019年附近发生了许多火灾。我们使用干涉合成孔径雷达(干涉合成孔径雷达)来测量表面位移,包括火灾后和火灾后的图像。我们还在2019年,2020年和2021年对Batagaika megaslump附近的两个疤痕周围以及2019年2014年疤痕周围的温度和解冻深度进行了现场测量。在2018年和2019年形成的三个火痕中,我们展示了沉降幅度、隆起和持续时间的逐年变化和特定位置的变化。2018年的疤痕显示,到2021年3月,累计下沉高达10厘米,比附近的2019年疤痕更明显。另一方面,与2014年疤痕相邻的另一个2019年疤痕在第一个跨火年显示出高达13 cm的净沉降,尽管沉降面积有限。这些不同的瞬态火灾后的响应表明,在yedoma地区的活动层深度和火灾的时间的空间不均匀性将控制随后的热岩溶过程。
Wildfires in Arctic regions impact landforms via permafrost degradation and subsequent deformation that can last for many years. However, it remains uncertain on if and how much deformations occur, and what controls their magnitude, particularly during the first couple of years. Here, we examine the transient post‐fire deformation responses near the Batagaika megaslump, which is the world's largest retrogressive thaw slump at Batagay, Sakha Republic. There were wildfires in the summers of 2018 and 2019 on the same slope, which could trigger the formation of another megaslump; many fires occurred nearby in 2019. We use interferometric synthetic aperture radar (InSAR) to measure surface displacements, including both post‐fire and span‐fire images. We also perform onsite measurements of temperature and thaw depth around the two scars near Batagaika megaslump in 2019, 2020, and 2021 and around the 2014 scar in 2019. At the three fire scars formed in 2018 and 2019, we demonstrate year‐to‐year and location‐specific changes in the amplitude of subsidence, heave, and duration. The 2018 scar shows cumulative subsidences of up to 10 cm by March 2021, more clearly than the nearby 2019 scar. On the other hand, another 2019 scar adjacent to the 2014 scar shows up to 13 cm net subsidence during the first span‐fire year, although the subsiding area is limited. These diverse transient post‐fire responses demonstrate that under the yedoma area the spatial heterogeneities of the active layer depth and the timing of fires will control subsequent thermokarst processes.
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