Spatio-temporal variability of carbon dioxide and methane emissions from a Mediterranean reservoir

IF 1.2 4区 环境科学与生态学 Q4 LIMNOLOGY Limnetica Pub Date : 2022-01-15 DOI:10.23818/limn.41.04
J. Montes-Pérez, B. Obrador, T. Conejo-Orosa, V. Rodríguez, R. Marcé, C. Escot, I. Reyes, J. Rodríguez, E. Moreno-Ostos
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引用次数: 4

Abstract

Spatio-temporal variability of carbon dioxide and methane emissions from a Mediterranean Reservoir Freshwater reservoirs constitute a significant source of carbon dioxide (CO2) and methane (CH4) to the atmosphere, and a precise quantification of the magnitude of these greenhouse gas emission on an annual scale is required. This quantification must consider both temporal and spatial variability of reservoir carbon gas fluxes. In addition, it is relevant to reinforce research focusing on the emission of CO2 and CH4 in Mediterranean reservoirs. Here, we simultaneously measured CO2 fluxes and CH4 ebullitive and diffusive emissions in the riverine and lacustrine zones of a Mediterranean reservoir (El Gergal, Spain) throughout a complete year to quantify their magnitude, explore their spatial and temporal variability, and investigate the potential limnological and hydrological factors influencing gases emissions. Our results show that during the study year El Gergal riverine zone was a CO2 sink, while the lacustrine zone was a CO2 source. In addition, both areas were CH4 sources to the atmosphere. CO2 and CH4 fluxes in El Gergal showed a marked temporal variability, with significant differences between mixing and thermally stratified periods. CO2 emissions were significantly influenced by surface chlorophyll-a concentration and pH, suggesting the prevalent role of primary production as CO2 flux driver. CH4 emissions were influenced by hypolimnetic methane concentration and hydrological factors potentially affected by climate change, such as water renewal rate and
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地中海水库二氧化碳和甲烷排放的时空变化
地中海水库淡水水库二氧化碳和甲烷排放的时空变化是大气中二氧化碳和甲烷的重要来源,需要对这些温室气体排放的年度规模进行精确量化。这种量化必须考虑储层碳气体通量的时间和空间变化。此外,加强对地中海水库CO2和CH4排放的研究也是有意义的。在这里,我们同时测量了地中海水库(El Gergal,西班牙)河流和湖泊区域全年的CO2通量和CH4沸腾和扩散排放,以量化其幅度,探索其空间和时间变异性,并调查影响气体排放的潜在湖沼学和水文因素。我们的研究结果表明,在研究年度,El Gergal河岸带是CO2汇,而湖泊带是CO2源。此外,这两个地区都是大气中的CH4来源。El Gergal的CO2和CH4通量表现出显著的时间变化,混合期和热分层期之间存在显著差异。CO2排放量受表面叶绿素a浓度和pH的显著影响,表明初级生产作为CO2通量驱动因素的普遍作用。CH4排放受低甲烷浓度和可能受气候变化影响的水文因素的影响,如水更新率和
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来源期刊
Limnetica
Limnetica LIMNOLOGY-MARINE & FRESHWATER BIOLOGY
CiteScore
3.70
自引率
7.10%
发文量
26
审稿时长
>12 weeks
期刊介绍: Limnetica publishes original research articles on the ecology of inland waters. The scope of Limnetica includes the ecology of rivers, lakes, reservoirs, coastal lagoons and wetlands, as well as biogeochemistry, paleolimnology, development of new methodologies, taxonomy, biogeography and any aspect of theoretical and applied continental aquatic ecology such as management and conservation, impact assessment, ecotoxicology and pollution. Limnetica will accept for its publication scientific articles presenting advances in knowledge or technological development, as well as as papers derived from new practical approaches on the topics covered by the journal.
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