Unraveling Lake Geneva's hypoxia crisis in the Anthropocene
Résumé
Recent decades have witnessed widespread deoxygenation of temperate lakes. The intricate interplay between climate change and nutrient loading and its impact on oxygen dynamics still lacks clear understanding. We develop a paleo-data-model coupling approach to investigate long-term variations of dissolved oxygen conditions in Lake Geneva over the period 1850-2100. Our approach provides first estimates of oxygen baseline conditions and quantifies duration of hypoxia since pre-disturbance. Over the 19 th and 20 th centuries, an increase in DO consumption rates (from 0.3 to 2.5 g O 2 m À2 d À1 ) following nutrient over-enrichment caused the onset of hypoxia, and its intensity and duration were governed by the combined influence of climatic forcing and high phosphorus concentration. In the future, hypoxia will be primarily disrupted by reduced frequency of full mixing events.
Domaines
Sciences de l'environnement
Fichier principal
Limnol Oceanogr Letters - 2024 - Soares - Unraveling Lake Geneva s hypoxia crisis in the Anthropocene.pdf (1.86 Mo)
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