Climate Change Data Portal
DOI | 10.3389/feart.2024.1354388 |
Dispersion and fate of methane emissions from cold seeps on Hikurangi Margin, New Zealand | |
发表日期 | 2024 |
EISSN | 2296-6463 |
起始页码 | 12 |
卷号 | 12 |
英文摘要 | The influence of cold seep methane on the surrounding benthos is well-documented but the fate of dissolved methane and its impact on water column biogeochemistry remains less understood. To address this, the distribution of dissolved methane was determined around three seeps on the south-east Hikurangi Margin, south-east of New Zealand, by combining data from discrete water column sampling and a towed methane sensor. Integrating this with bottom water current flow data in a dynamic Gerris model determined an annual methane flux of 3 x 105 kg at the main seep. This source was then applied in a Regional Ocean Modelling System (ROMS) simulation to visualize lateral transport of the dissolved methane plume, which dispersed over similar to 100 km in bottom water within 1 year. Extrapolation of this approach to four other regional seeps identified a combined plume volume of 3,500 km3 and annual methane emission of 0.4-3.2 x 106 kg CH4 y-1. This suggests a regional methane flux of 1.1-10.9 x 107 kg CH4 y-1 for the entire Hikurangi Margin, which is lower than previous hydroacoustic estimates. Carbon stable isotope values in dissolved methane indicated that lateral mixing was the primary determinant of methane in bottom water, with potential methane oxidation rates orders of magnitude lower than the dilution rate. Calculations indicate that oxidation of the annual total methane emitted from the five seeps would not significantly alter bottom water dissolved carbon dioxide, oxygen or pH; however, superimposition of methane plumes from different seeps, which was evident in the ROMS simulation, may have localized impacts. These findings highlight the value of characterizing methane release from multiple seeps within a hydrodynamic model framework to determine the biogeochemical impact, climate feedbacks and connectivity of cold seeps on continental shelf margins. |
英文关键词 | methane; hydrates; hydrodynamic model; methane oxidation; continental shelf; New Zealand; mixing; climate change |
语种 | 英语 |
WOS研究方向 | Geology |
WOS类目 | Geosciences, Multidisciplinary |
WOS记录号 | WOS:001204668600001 |
来源期刊 | FRONTIERS IN EARTH SCIENCE |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/304569 |
作者单位 | National Institute of Water & Atmospheric Research (NIWA) - New Zealand; University of Otago; University of London; University College London |
推荐引用方式 GB/T 7714 | . Dispersion and fate of methane emissions from cold seeps on Hikurangi Margin, New Zealand[J],2024,12. |
APA | (2024).Dispersion and fate of methane emissions from cold seeps on Hikurangi Margin, New Zealand.FRONTIERS IN EARTH SCIENCE,12. |
MLA | "Dispersion and fate of methane emissions from cold seeps on Hikurangi Margin, New Zealand".FRONTIERS IN EARTH SCIENCE 12(2024). |
条目包含的文件 | 条目无相关文件。 |
个性服务 |
推荐该条目 |
保存到收藏夹 |
导出为Endnote文件 |
谷歌学术 |
谷歌学术中相似的文章 |
百度学术 |
百度学术中相似的文章 |
必应学术 |
必应学术中相似的文章 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。