Lake surface cooling drives littoral-pelagic exchange of dissolved gases Doda, Tomy Ramón Casañas, Cintia Luz Ulloa, Hugo N. Brennwald, Matthias S. Kipfer, Rolf Perga, Marie Elodie Wüest, Alfred Schubert, Carsten J. Bouffard, Damien The extent of littoral influence on lake gas dynamics remains debated in the aquatic science community due to the lack of direct quantification of lateral gas transport. The prevalent assumption of diffusive horizontal transport in gas budgets fails to explain anomalies observed in pelagic gas concentrations. Here, we demonstrate through high-frequency measurements in a eutrophic lake that daily convective horizontal circulation generates littoral-pelagic advective gas fluxes one order of magnitude larger than typical horizontal fluxes used in gas budgets. These lateral fluxes are sufficient to redistribute gases at the basin-scale and generate concentration anomalies reported in other lakes. Our observations also contrast the hypothesis of pure, nocturnal littoral-to-pelagic exchange by showing that convective circulation transports gases such as oxygen and methane toward both the pelagic and littoral zones during the daytime. This study challenges the traditional pelagic-centered models of aquatic systems by showing that convective circulation represents a fundamental lateral transport mechanism to be integrated into gas budgets. 2024-05-24T09:01:48Z 2024-05-24T09:01:48Z 2024-01-24 journal article Tomy Doda et al., Lake surface cooling drives littoral-pelagic exchange of dissolved gases. Sci. Adv. 10, eadi0617 (2024). DOI: 10.1126/sciadv.adi0617 https://hdl.handle.net/10481/92047 10.1126/sciadv.adi0617 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional American Association for the Advancement of Science (AAAS)