LAKES: Past, present and future of alpine lakes

A wonderful video from Isabel Herr.

Nicolas obtained one of the CLIMACT starting grants for the project he is leading on “the unseen processes of enhanced weathering”. This project includes a collaboration with Lyesse Laouli (EPFL), Stéphanie Grand (UNIL), Pascal Schwaab (UNIL) and Marie Perga. In this one-year long project, Nicolas garnered biogeochemical competences from soils, terrestrial and aquatic environments to provide an exhaustive and comprehensive state-of-the-art of the current knowledge about EW approaches and to scrutinize the data and modelled processes on which assessments of EW efficiency are based.

NEW Lambert, T., Perolo, P., Escoffier, N., and Perga, M.-E.: Enhanced bioavailability of dissolved organic matter (DOM) in human-disturbed streams in Alpine fluvial networks, Biogeosciences, https://doi.org/10.5194/bg-2021-131, accepted.

Pascal’s new paper is now online, open access.

Perolo, P., B. Fernández Castro, N. Escoffier, T. Lambert, D. Bouffard, and M. E. Perga. 2021. Accounting for surface waves improves gas flux estimation at high wind speed in a large lake. Earth Syst. Dynam. 12:1169-1189.

Wind blowing over the ocean creates waves, which by increasing the level of turbulence, promote gas exchange at the air-water interface. In Pascal’s first PhD paper, we measured for the first time enhanced gas exchanges by wind-induced waves at the surface of a large lake. We adapted an ocean-based model to account for surface waves on gas exchange in lakes. We finally show that intense wind events with surface waves contribute disproportionately to the annual CO₂ gas flux in a large lake.

First PhD paper out from Lexplore and a nice UNIL-EAWAG-EPFL collaboration.

Perolo, P., Fernández Castro, B., Escoffier, N., Lambert, T., Bouffard, D., and Perga, M.-E.: Accounting for surface waves improves gas flux estimation at high wind speed in a large lake, Earth Syst. Dynam. https://doi.org/10.5194/esd-2021-30, in press, 2021.