Physical Factors and Microbubble Formation Explain Differences in CH4 Dynamics Between Shallow Lakes Under Alternative States

Abstract

Submerged macrophytes play a key role in maintaining clear vegetated states in shallow lakes, but their role on methane (CH4) dynamics is less explored. They might enhance methanogenesis by providing organic matter but they can also supply oxygen to the sediments increasing methanotrophy. They may also affect gas exchange by diminishing wind turbulence in the water column. We previously measured seasonal CO2 and CH4 partial pressure (pCO2 and pCH4) and diffusive fluxes from two clear vegetated and two turbid algal shallow lakes of the Pampean Plain, Argentina, and we reported that clear lakes had higher mean annual pCH4 despite states having similar mean annual CH4 diffusive flux. In this study we explore the contribution of physical and biological factors regulating surface pCH4. Mean annual CH4 diffusive fluxes and CH4 fraction of oxidation (Fox) were similar between states, implying a comparable mean annual CH4 input. kCH4 was significantly higher than kCO2, suggesting occurrence of CH4 microbubbles, yet kCH4 was higher in turbid lakes than in clear lakes, implying a higher microbubble formation in turbid lakes. Furthermore, in turbid lakes there were positive relationships between k and wind speed, and between k and pCH4, yet in clear lakes these relations were absent. Results suggest that submerged vegetation suppresses wind induced turbulence in clear vegetated lakes, decoupling kCH4 from wind and reducing microbubble formation, therefore augmenting pCH4 in their surface waters. Overall, physical rather than biological factors appear to control the observed differences in pCH4 between states.

Shallow lakes under alternative states differ in the dominant greenhouse gas emission pathways

“…However, diffusive fluxes in these seasons were similar between states. Moreover, mean annual CH 4 exchange velocity from clear lakes was lower than in turbid lakes (Baliña et al 2022), which could be related to enhanced near-surface turbulence in turbid lakes due to stronger near-surface stratification and greater rates of turbulence dissipation, leading to higher CH 4 exchange velocities (MacIntyre et al 2021). Similar results were reported by Barbosa et al (2020), with highest pCH 4 in sites with macrophytes in comparison with OW sites, probably related to macrophyte biomass decomposition, but with similar CH 4 diffusive fluxes between them.…”

A Novel High‐Resolution In Situ Tool for Studying Carbon Biogeochemical Processes in Aquatic Systems: The Lake Aiguebelette Case Study

“…This relationship is likely explained by the fact that smaller lakes have a larger littoral‐to‐total area ratio with the littoral zone being the location where a large portion of CH 4 production occurs. Littoral surface waters are not only closest to anoxic sediments where methanogenesis occurs but also to zones of macrophytes that have a significant influence on CH 4 concentrations (Baliña et al., 2022; Bastviken et al., 2023; Desrosiers et al., 2022) and may even contribute to OMP (Hilt et al., 2022). Shallow littoral waters are also more heavily influenced by wind, waves (Bussmann, 2005; Hofmann et al., 2010; Murase et al., 2005), and atmospheric pressure (Joyce & Jewell, 2003; Wik et al., 2013), all of which can enhance CH 4 diffusion and ebullition, and the resulting dissolved CH 4 concentrations in the littoral zone.…”