揭示人类世的日内瓦湖缺氧危机

IF 5.1 2区 地球科学 Q1 LIMNOLOGY Limnology and Oceanography Letters Pub Date : 2024-10-08 DOI:10.1002/lol2.10435
Laura M. V. Soares, Olivia Desgué‐Itier, Cécilia Barouillet, Céline Casenave, Isabelle Domaizon, Victor Frossard, Nelson G. Hairston, Andrea Lami, Bruno J. Lemaire, Georges‐Marie Saulnier, Frédéric Soulignac, Brigitte Vinçon‐Leite, Jean‐Philippe Jenny
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引用次数: 0

摘要

尽管有全球证据表明存在湖泊脱氧现象,但其持续时间、时间以及对十年至百年时间尺度的影响仍不确定。本研究采用一种新颖的模型方法,利用 150 年的湖沼学和古气候学数据来评估人类活动对日内瓦湖深层氧气的影响。研究结果表明,文化富营养化导致耗氧率增加,最初引发了历史性缺氧,随后气候变化导致冬季混合减少又加剧了缺氧。对富营养化前的条件和未来的气候情景进行模拟,确定了湖泊在没有严重缺氧风险的情况下繁荣发展的安全操作空间。完全的冬季混合和每 3 年一次的氧气补给可以补偿日内瓦湖的氧气需求,即使在氧气需求超过 1.5 g O2 m-2 d-1 的情况下也是如此。然而,当冬季完全混合变得不那么频繁时,即使消耗率与富营养化前类似,也会造成持续缺氧,对下沉水生生物的生存构成重大威胁。
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Unraveling Lake Geneva's hypoxia crisis in the Anthropocene
Despite global evidence of lake deoxygenation, its duration, timing, and impacts over decadal to centennial timescales remain uncertain. This study introduces a novel model approach using 150 yr of limnological and paleolimnological data to evaluate the anthropogenic impacts on deep oxygen in Lake Geneva. Results highlight an increase in oxygen consumption rates due to cultural eutrophication, initially triggering historical hypoxia, subsequently exacerbated by reduced winter mixing induced by climate change. Simulations of pre‐eutrophication conditions and future climate scenarios define safe operating spaces for the lake to thrive without severe hypoxia risk. Complete winter mixing and O2 recharge once every 3 yr can compensate the oxygen demand in Lake Geneva, even when exceeding 1.5 g O2 m−2 d−1. However, when complete winter mixing becomes less frequent, even consumption rates similar to those observed before eutrophication can cause persistent hypoxia, posing a significant threat to the survival of hypolimnetic aquatic life.
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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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