在阿拉斯加北部受融影响的永久土地形的火灾后稳定
Benjamin M Jones1, Mikhail Z Kanevskiy2, Yuri Shur3
1Institute of Northern Engineering, University of Alaska Fairbanks, Fairbanks, AK, 99775, USA. bmjones3@alaska.edu.
Scientific reports
|April 11, 2024
概括
2007年阿纳克图武克河火灾导致北极原的永久土广泛融化. 然而,随后的观测显示稳定,永久土堆积和减少融化沉降表明受影响的地形的恢复.
科学领域:
- 北极环境科学 北极环境科学
- 永久土的动态 永久土的动态
- 地质化学 地质化学
背景情况:
- 2007年Anaktuvuk河火灾影响了超过1000平方公里的北极原,其中50%影响了富含冰的合成永久土 (Yedoma).
- 火灾后的初步观测显示,到2014年,耶多马地区的冰明显退化和融化沉降.
研究的目的:
- 评估阿纳克图武克河火灾对永久土的长期影响.
- 为了监测融沉降的变化,地面温度和被烧毁的北极原的永久土恢复.
主要方法:
- 利用2009年,2014年和2021年的重复空中LiDAR数据来绘制解沉降的地图.
- 从2010年到2022年进行地面温度测量,以分析热变化.
- 收集永久土核心以确定融化不一致性并评估永久土恢复.
主要成果:
- 融化沉降最初影响到2014年的研究区域的15%,到2021年降至<1%,表明稳定.
- 接近地表的地面温度显示火灾后的解度日增加,后来下降,平均年地面温度最初上升,然后降温.
- 永久土核心显示了解不一致,恢复的永久土层在冰槽中平均为14.2厘米,在多边形中心为18.3厘米.
结论:
- 在阿纳克图武克河火灾之后,冰丰富的永久土的初始退化之后,出现了一段解停止的时期.
- 观察结果表明永久土堆积和受影响的原地形的稳定.
- 该研究强调了北极永久土在重大火灾干扰后复杂的恢复过程.
相关概念视频
02:17Ecological Succession
17.2K
Ecological succession is influenced by the processes of facilitation, inhibition, and toleration. Facilitation occurs when early successional species create more favorable ecological conditions for subsequent species, such as enhanced nutrient, water, or light availability. In contrast, inhibition happens when early successional species create unfavorable ecological conditions for potential successive species, such as limiting resource availability. In some cases, later successional species...
17.2K
01:50Threats to Biodiversity
22.3K
There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...
22.3K
01:12Taping Over Different Ground Profiles
25
Taping over varying ground profiles requires careful adaptation to achieve accurate measurements. On smooth, level ground with minimal vegetation, the tape can rest directly on the ground. Here, the taping team, typically consisting of a head and a rear tapeman, coordinates their positions with clear communication. The rear tapeman holds the tape at the starting point and guides the head tapeman toward a range pole placed beyond the endpoint, using hand or voice signals to ensure alignment.On...
25