Many Gaël, Escoffier Nicolas, Perolo Pascal, Bärenbold Fabian, Bouffard Damien, Perga Marie-Elodie
Institute of Earth Surface Dynamics, Faculty of Geosciences and Environment,University of Lausanne, Quartier Mouline, CH-1015 Lausanne, Switzerland.
Surface Waters - Research and Management, Eawag, Swiss Federal Institute of Aquatic Science and Technology, Seestrasse 79, CH-6047 Kastanienbaum, Switzerland.
Sci Adv. 2024 Nov;10(44):eado5924. doi: 10.1126/sciadv.ado5924. Epub 2024 Oct 30.
Lakes emit substantial amounts of carbon dioxide (CO) into the atmosphere, but why they do remains debated. The long-standing vision of lakes as solely respirators of the organic matter leaking from the soils has been challenged by evidence that inorganic carbon produced by weathering of the catchment bedrock could also support lake CO emissions. How inorganic carbon inputs ultimately generate lake CO outgassing remains a blind spot. We develop and introduce a calcite module in a coupled one-dimensional physical-biogeochemical model that we use to simulate the carbon cycle of the large Lake Geneva over the past 40 years. We mechanistically demonstrate how the so-far neglected process of calcite precipitation boosts net CO emissions at the annual scale. Far from being anecdotal, we show that calcite precipitation could explain CO outgassing across various lakes globally, including some of the largest lakes in the world.
湖泊会向大气中排放大量二氧化碳（CO₂），但其排放原因仍存在争议。长期以来，湖泊仅被视为从土壤中渗漏出的有机物质的呼吸者，然而有证据表明，集水区基岩风化产生的无机碳也可能支持湖泊的CO₂排放，这一观点受到了挑战。无机碳输入最终如何导致湖泊CO₂排放仍是一个盲点。我们在一个一维物理-生物地球化学耦合模型中开发并引入了一个方解石模块，用于模拟过去40年里大型日内瓦湖的碳循环。我们从机制上证明了迄今为止被忽视的方解石沉淀过程如何在年度尺度上促进净CO₂排放。我们发现方解石沉淀并非个例，它可以解释全球各类湖泊的CO₂排放情况，包括世界上一些最大的湖泊。
