Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017JD027675 |
Emission of Methane and Heavier Alkanes From the La Brea Tar Pits Seepage Area, Los Angeles | |
Etiope, G.1,2; Doezema, L. A.3; Pacheco, C.3 | |
2017-11-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2017 |
卷号 | 122期号:21 |
文章类型 | Article |
语种 | 英语 |
国家 | Romania; USA |
英文摘要 | Natural hydrocarbon (oil and gas) seeps are widespread in Los Angeles, California, due to gas migration, along faults, from numerous subsurface petroleum fields. These seeps may represent important natural contributors of methane (CH4) and heavier alkanes (C-2-C-4) to the atmosphere, in addition to anthropogenic fossil fuel and biogenic sources. We measured the CH4 flux by closed-chamber method from the La Brea Tar Pits park (0.1 km(2)), one of the largest seepage sites in Los Angeles. The gas seepage occurs throughout the park, not only from visible oil-asphalt seeps but also diffusely from the soil, affecting grass physiology. About 500 kg CH4 d(-1) is emitted from the park, especially along a belt of enhanced degassing that corresponds to the 6th Street Fault. Additional emissions are from bubble plumes in the lake within the park (order of 10(2)-10(3) kg d(-1)) and at the intersection of Wilshire Boulevard and Curson Avenue (>130 kg d(-1)), along the same fault. The investigated area has the highest natural gas flux measured thus far for any onshore seepage zone in the USA. Gas migration, oil biodegradation, and secondary methanogenesis altered the molecular composition of the original gas accumulated in the Salt Lake Oil Field (>300 m deep), leading to high C-1/C2+ and i-butane/n-butane ratios. These molecular alterations can be important tracers of natural seepage and should be considered in the atmospheric modeling of the relative contribution of fossil fuel (anthropogenic fugitive emission and natural geologic sources) versus biogenic sources of methane, on local and global scales. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000417195500042 |
WOS关键词 | LIGHT ALKANES ; GAS ; BASIN ; ORIGIN ; OIL ; BIODEGRADATION ; ACCUMULATIONS ; ATMOSPHERE ; CALIFORNIA ; GEOHAZARD |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/32301 |
专题 | 气候变化 |
作者单位 | 1.Ist Nazl Geofis & Vulcanol, Sez Roma 2, Roma, Romania; 2.Babes Bolyai Univ, Fac Environm Sci & Engn, Cluj Napoca, Romania; 3.Loyola Marymount Univ, Chem & Biochem, Los Angeles, CA 90045 USA |
推荐引用方式 GB/T 7714 | Etiope, G.,Doezema, L. A.,Pacheco, C.. Emission of Methane and Heavier Alkanes From the La Brea Tar Pits Seepage Area, Los Angeles[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2017,122(21). |
APA | Etiope, G.,Doezema, L. A.,&Pacheco, C..(2017).Emission of Methane and Heavier Alkanes From the La Brea Tar Pits Seepage Area, Los Angeles.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,122(21). |
MLA | Etiope, G.,et al."Emission of Methane and Heavier Alkanes From the La Brea Tar Pits Seepage Area, Los Angeles".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 122.21(2017). |
条目包含的文件 | 条目无相关文件。 |
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。
修改评论