气候变化领域集成服务门户(CCPortal): Reliable reference for the methane concentrations in Lake Kivu at the beginning of industrial exploitation

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DOI	10.5194/hess-23-4707-2019
	Reliable reference for the methane concentrations in Lake Kivu at the beginning of industrial exploitation
	Boehrer B.; Von Tümpling W.; Mugisha A.; Rogemont C.; Umutoni A.
发表日期	2019
ISSN	1027-5606
起始页码	4707
结束页码	4716
卷号	23 期号:11
英文摘要	Dissolved methane in Lake Kivu (East Africa) represents a precious energy deposit for the neighbouring countries, but the high gas loads have also been perceived as a threat by the local population. This is especially the case with respect to potential changes to the lake's stratification during planned industrial exploitation. Both of the above-mentioned issues require accurate and reliable measurements of dissolved gases and temporal changes to take responsible action. Previous data were unable to satisfactorily fulfil these requirements. Prior to our measurements, there was considerable disagreement about prognosticated new formation of methane. We show how measurement accuracy could be significantly improved by implementing equipment that is especially designed and modified for the complex gas conditions in Lake Kivu. Samples were taken from depths of 150 to 430 m to more reliably and more accurately determine the amount of dissolved methane and dissolved carbon dioxide. Beyond the provision of gas concentration profiles at the beginning of exploitation, this investigation can also potentially provide methods to survey the further evolution of gases over time. The use of gas-tight sampling bags produced highly reliable and accurate measurements. Our measurements confirmed the huge amount of stored methane, but clearly did not support the current belief of a significant recharge beyond diffusive loss. Direct measurements with a custom-made gas pressure sensor indicated no imminent danger due to limnic eruptions. However, a further survey of gas pressures is mandatory to detect changing conditions. Using sampling bags and a gas pressure sensor, we introduced reliable and highly accurate measurement approaches for the survey of the further development of gas concentrations. This equipment requires little effort with respect to calibration, which makes it suitable for use in the remote areas of Africa. © 2019 Copernicus GmbH. All rights reserved.
语种	英语
scopus关键词	Carbon dioxide; Dissolution; Lakes; Methane; Pressure sensors; Surveys; Accurate measurement; Direct measurement; Dissolved carbon dioxide; Gas concentration; Gas pressure sensor; Measurement accuracy; Methane concentrations; Reliable measurement; Gases; concentration (composition); dissolved gas; exploitation; methane; stratification; East African Lakes; Lake Kivu
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159564
作者单位	Boehrer, B., Helmholtz Centre for Environmental Research-UFZ, Magdeburg, Germany; Von Tümpling, W., Helmholtz Centre for Environmental Research-UFZ, Magdeburg, Germany; Mugisha, A., Lake Kivu Management Program LKMP, Gisenyi, Rwanda; Rogemont, C., Hi-Tech Detection Systems, Massy Cedex, France; Umutoni, A., Lake Kivu Management Program LKMP, Kigali, Rwanda
推荐引用方式 GB/T 7714	Boehrer B.,Von Tümpling W.,Mugisha A.,et al. Reliable reference for the methane concentrations in Lake Kivu at the beginning of industrial exploitation[J],2019,23(11).
APA	Boehrer B.,Von Tümpling W.,Mugisha A.,Rogemont C.,&Umutoni A..(2019).Reliable reference for the methane concentrations in Lake Kivu at the beginning of industrial exploitation.Hydrology and Earth System Sciences,23(11).
MLA	Boehrer B.,et al."Reliable reference for the methane concentrations in Lake Kivu at the beginning of industrial exploitation".Hydrology and Earth System Sciences 23.11(2019).