Turbulent mixing controls the vertical transfer of heat, gases and nutrients in stratified water bodies, shaping their response to environmental forcing. Nevertheless, due to technical limitations, the redistribution of wind-derived energy fuelling turbulence within stratified lakes has only been mapped over short (sub-annual) timescales. Here we present a year-round observational record of energy fluxes in the large Lake Geneva. Contrary to the standing view, we show that the benthic layers are the main locus for turbulent mixing only during winter. Instead, most turbulent mixing occurs in the water-column interior during the stratified summer season, when the co-occurrence of thermal stability and lighter winds weakens near-sediment currents. Since stratified conditions are becoming more prevalent –possibly reducing turbulent fluxes in deep benthic environments–, these results contribute to the ongoing efforts to anticipate the effects of climate change on freshwater quality and ecosystem services in large lakes.

Seasonality modulates wind-driven mixing pathways in a large lake / Fernández Castro, Bieito; Bouffard, Damien; Troy, Cary; Ulloa, Hugo N.; Piccolroaz, Sebastiano; Sepúlveda Steiner, Oscar; Chmiel, Hannah E.; Serra Moncadas, Lucas; Lavanchy, Sébastien; Wüest, Alfred. - In: COMMUNICATIONS EARTH & ENVIRONMENT. - ISSN 2662-4435. - ELETTRONICO. - 2:1(2021), pp. 215.1-215.11. [10.1038/s43247-021-00288-3]

Seasonality modulates wind-driven mixing pathways in a large lake

Piccolroaz, Sebastiano;
2021-01-01

Abstract

Turbulent mixing controls the vertical transfer of heat, gases and nutrients in stratified water bodies, shaping their response to environmental forcing. Nevertheless, due to technical limitations, the redistribution of wind-derived energy fuelling turbulence within stratified lakes has only been mapped over short (sub-annual) timescales. Here we present a year-round observational record of energy fluxes in the large Lake Geneva. Contrary to the standing view, we show that the benthic layers are the main locus for turbulent mixing only during winter. Instead, most turbulent mixing occurs in the water-column interior during the stratified summer season, when the co-occurrence of thermal stability and lighter winds weakens near-sediment currents. Since stratified conditions are becoming more prevalent –possibly reducing turbulent fluxes in deep benthic environments–, these results contribute to the ongoing efforts to anticipate the effects of climate change on freshwater quality and ecosystem services in large lakes.
2021
1
Fernández Castro, Bieito; Bouffard, Damien; Troy, Cary; Ulloa, Hugo N.; Piccolroaz, Sebastiano; Sepúlveda Steiner, Oscar; Chmiel, Hannah E.; Serra Mon...espandi
Seasonality modulates wind-driven mixing pathways in a large lake / Fernández Castro, Bieito; Bouffard, Damien; Troy, Cary; Ulloa, Hugo N.; Piccolroaz, Sebastiano; Sepúlveda Steiner, Oscar; Chmiel, Hannah E.; Serra Moncadas, Lucas; Lavanchy, Sébastien; Wüest, Alfred. - In: COMMUNICATIONS EARTH & ENVIRONMENT. - ISSN 2662-4435. - ELETTRONICO. - 2:1(2021), pp. 215.1-215.11. [10.1038/s43247-021-00288-3]
File in questo prodotto:
File Dimensione Formato  
s43247-021-00288-3.pdf

accesso aperto

Tipologia: Versione editoriale (Publisher’s layout)
Licenza: Creative commons
Dimensione 2.65 MB
Formato Adobe PDF
2.65 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/320005
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? 10
social impact