Idiosyncratic phenology of greenhouse gas emissions in a Mediterranean reservoir

IF 5.1 2区 地球科学 Q1 LIMNOLOGY
Eva Rodríguez-Velasco, Ignacio Peralta-Maraver, Andrés Martínez-García, Miriam García-Alguacil, Félix Picazo, Rodrigo J. Gonçalves, Cintia L. Ramón, Rafael Morales-Baquero, Francisco J. Rueda, Isabel Reche
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Abstract

Extreme hydrological and thermal regimes characterize the Mediterranean zone and can influence the phenology of greenhouse gas (GHG) emissions in reservoirs. Our study examined the seasonal changes in GHG emissions of a shallow, eutrophic, hardwater reservoir in Spain. We observed distinctive seasonal patterns for each gas. CH4 emissions substantially increased during stratification, influenced predominantly by the increase in water temperature, net ecosystem production, and the decline in reservoir mean depth. N2O emissions mirrored CH4's seasonal trend, significantly correlating to water temperature, wind speed, and gross primary production. Conversely, CO2 emissions decreased during stratification and displayed a quadratic, rather than a linear relationship with water temperature—an unexpected deviation from CH4 and N2O emission patterns—likely associated with photosynthetic uptake of bicarbonate and formation of intracellular calcite that might be exported to sediments. This investigation highlights the imperative of integrating these idiosyncratic patterns into GHG emissions models, enhancing their predictive power.

Abstract Image

地中海水库温室气体排放的非同步物候学
极端的水文和热制度是地中海地区的特点,会影响水库温室气体(GHG)排放的物候学。我们的研究考察了西班牙一个浅层富营养化硬水水库的温室气体排放季节变化。我们观察到每种气体都有独特的季节模式。主要受水温升高、生态系统净生产和水库平均深度下降的影响,CH4 排放量在分层期间大幅增加。一氧化二氮的排放量与甲烷的季节变化趋势相同,与水温、风速和总初级生产力密切相关。与此相反,二氧化碳排放量在分层过程中减少,并且与水温呈二次关系而非线性关系--这出乎意料地偏离了甲烷和氧化亚氮的排放模式--这可能与光合作用吸收碳酸氢盐和形成细胞内方解石(可能会排出到沉积物中)有关。这项调查强调了将这些特异性模式纳入温室气体排放模型的必要性,从而提高其预测能力。
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来源期刊
CiteScore
10.00
自引率
3.80%
发文量
63
审稿时长
25 weeks
期刊介绍: Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.
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