微地震观测显示内波加剧了海底甲烷释放

IF 6 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Zhaoyang Tian, Yonggang Jia, Junjiang Zhu, Tian Chen, Hui Wang, Chunsheng Ji, Chengyu Liu, Longyu Lu, Manchao He
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引用次数: 0

摘要

内波将物质和能量从上层水体输送到深海,扰动海底沉积物,造成海底侵蚀和地形变化等现象。在南海北坡和世界上许多沿海边缘地区,内波作用区与存在天然气水合物的区域密切重叠。然而,由于时空尺度的显著差异,了解内波对深海海底甲烷释放的影响具有挑战性。本研究在南海珠江峡谷水深 655 米和 1450 米处对海底微地震和内波进行了现场观测。确定了内波和海底甲烷释放引起的微地震,提出了利用微地震记录建立内波和海底甲烷释放相关性的方法,旨在获得内波加剧海底甲烷释放的直接观测证据。结果表明,内波和海底甲烷释放产生了显著的微地震信号,表明内波对南海北坡深海海底的持续影响,揭示了海底活跃的甲烷释放现象。在长短时间尺度上,内波使海底甲烷释放的频率分别增加了 4.2 倍和 2.4 倍,同时也增强了这些释放的强度。这些变化受到内波活动引起的海底流速、压力和温度变化的影响。这项研究强调,微地震信号是海底多尺度地质过程的有效信息载体,并表明内波加剧了海底甲烷的释放,从而加剧了海洋地质灾害并加剧了全球气候变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Microseismic observations reveal that internal waves intensify seabed methane release

Internal waves transport material and energy from the upper water column to the deep ocean, disturbing seabed sediments and resulting in phenomena such as seabed erosion and changes in topography. On the northern slope of the South China Sea and in many coastal margins worldwide, the zones with internal wave action closely overlap with areas where natural gas hydrates are present. However, due to significant differences in the spatial and temporal scales, understanding the influence of internal waves on methane releases from deep seabeds is challenging. In this study, in situ observations of seabed microseismicity and internal waves are conducted at water depths of 655 meters and 1450 meters in the Pearl River Canyon of the South China Sea. The microseismicity caused by internal waves and seabed methane releases is identified, and a method to establish the correlation between internal waves and seabed methane releases through the use of microseismic recordings is proposed, aiming to obtain direct observational evidence of internal waves intensifying seabed methane releases. The results show that internal waves and seabed methane releases generate significant microseismic signals, indicating the continuous influence of internal waves on the deep seabed of the northern slope of the South China Sea and revealing active methane release phenomena on the seabed. At both long and short time scales, internal waves increase the frequency of seabed methane releases by 4.2 times and 2.4 times, respectively, while also enhancing the intensity of these releases. These changes are influenced by the alterations in seabed flow velocity, pressure, and temperature that are induced by internal wave activities. This study emphasizes that microseismic signals are effective carriers of information for multiscale geological processes on seabeds and suggests that internal waves exacerbate marine geological hazards and contribute to global climate change by intensifying seabed methane releases.

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来源期刊
Science China Earth Sciences
Science China Earth Sciences GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
9.60
自引率
5.30%
发文量
135
审稿时长
3-8 weeks
期刊介绍: Science China Earth Sciences, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research.
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