Article
Multidisciplinary Sciences
Sebastiano Piccolroaz, Bieito Fernandez-Castro, Marco Toffolon, Henk A. Dijkstra
Summary: This dataset includes 606 high-resolution turbulence microstructure profiles of shear and temperature gradient in the upper 100 m depth of Lake Garda (Italy) and concurrent meteorological data. The dataset can be used for research on turbulent mixing variability, validation of hydrodynamic lake models, and technical studies on the use of shear and temperature microstructure sensors.
Article
Mechanics
Asim Onder, Philip L. -F. Liu
Summary: Direct numerical simulations reveal a nonlinear feedback loop in a solitary wave boundary layer, where the flow selectively responds to broadband perturbations and develops streamwise-elongated streaks. As the streak amplitudes increase, strong vortices are indirectly amplified, leading to more effective stirring of the boundary layer through the lift-up mechanism.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Environmental Sciences
Bieito Fernandez Castro, Damien Bouffard, Cary Troy, Hugo N. Ulloa, Sebastiano Piccolroaz, Oscar Sepulveda Steiner, Hannah E. Chmiel, Lucas Serra Moncadas, Sebastien Lavanchy, Alfred Wuest
Summary: Turbulent mixing in Lake Geneva is strongest in the interior water-column during the summer season, as stratification limits wind-driven mixing near the sediment. These results provide insight for anticipating the effects of climate change on freshwater quality and ecosystem services in large lakes, as stratified conditions become more prevalent.
COMMUNICATIONS EARTH & ENVIRONMENT
(2021)
Article
Mechanics
Thea J. Ellevold, John Grue
Summary: The instability and vortex shedding caused by internal solitary waves of depression propagating along a shallow pycnocline were computed. The results were in good agreement with laboratory experiments, but disagreed with existing computations. The instability boundary depended on the depth of the pycnocline and decayed with increasing depth and stratification Reynolds number. The oscillatory bed shear stress was strong and increased with scale, comparable to turbulent stress observed in the field.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Geosciences, Multidisciplinary
S. M. Hamze-Ziabari, A. M. Razmi, U. Lemmin, D. A. Barry
Summary: Submesoscale filaments have been found in Lake Geneva for the first time based on high-resolution 3D numerical simulations, field observations, and remote sensing imagery. These filaments are formed during summertime and have significant impacts on the biophysical processes in the lake.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Xiaozhou Ruan, Jacob O. Wenegrat, Jonathan Gula
Summary: Bottom drag is a key mechanism for dissipating kinetic energy from the ocean's general circulation, but there are significant uncertainties in global estimates of this process. The velocity structures and characteristics of the bottom boundary layer can affect the estimates of bottom drag dissipation, and prior estimates may have been overestimated. Resolving these issues is crucial for closing the global kinetic energy budget.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Limnology
Frederic Soulignac, Ulrich Lemmin, Seyed Mahmood Hamze Ziabari, Htet Kyi Wynn, Benjamin Graf, David Andrew Barry
Summary: This study documents the rapid change of negatively buoyant river inflow dynamics caused by the passing of a coastal upwelling in Lake Geneva during summer stratification in 2019. Strong winds caused by coastal upwelling can homogenize lake water temperatures, transforming river inflow into an intrusion that spreads over the whole water column.
LIMNOLOGY AND OCEANOGRAPHY
(2021)
Article
Geosciences, Multidisciplinary
Damien Sous, Samantha Maticka, Samuel Meule, Frederic Bouchette
Summary: This study reports on a field experiment conducted over a shallow, roughness-varying barrier reef at Maupiti island, French Polynesia. The results show that the bottom drag coefficient C-d varies with both depth and reef structure, and the depth effect on C-d can be predicted using a log dependency. Additionally, the study discusses the statistical relationship between high-resolution reef topography and hydrodynamical parameters.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Ju-Mee Ryoo, Leonhard Pfister, Rei Ueyama, Paquita Zuidema, Robert Wood, Ian Chang, Jens Redemann
Summary: The ORACLES project conducted 3-month-long deployments in the southeastern Atlantic Ocean from 2016 to 2018 to study the impact of biomass burning aerosols on climate. The southern African easterly jet (AEJ-S) was a key feature during the deployment months of August 2017, September 2016, and October 2018. Notable meteorological anomalies were observed during these months compared to climatology, with differences in wind patterns, rainfall, and atmospheric circulation.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Article
Oceanography
A. P. Zulberti, N. L. Jones, M. D. Rayson, G. N. Ivey
Summary: This study presents observations of the mean and turbulent field of a bottom mixing-layer at a gently sloping continental shelf site influenced by tides and nonlinear internal waves. The study finds that the thickness of the mixing-layer varies at both semidiurnal and sub-tidal frequencies, with an average thickness of around 10 meters. The compression and expansion of the mixing-layer by internal tides and nonlinear internal waves affects the mean velocity profiles.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Engineering, Civil
Fangfang Zhu, Nicholas Dodd, Riccardo Briganti, Magnus Larson, Jie Zhang
Summary: This paper introduces a bottom boundary layer model for unsteady and non-uniform flow in the swash zone, incorporating spatial gradients into the momentum integral method. Results show significant effects of spatial gradients on the lower swash and seaward region, enhancing onshore bed shear stress under non-breaking waves. The model also accurately reproduces swash dynamics in different case studies, favoring onshore sediment transport and showing more comprehensive capture of the swash boundary layer.
COASTAL ENGINEERING
(2022)
Article
Astronomy & Astrophysics
Noemi Kinga Zsamberger, Carmen M. Sanchez Montoya, Robert Erdelyi
Summary: Building on recent studies of the Kelvin-Helmholtz instability, this research investigates the influence of bulk flows on the propagation of MHD waves. Analytical and numerical analyses reveal that flow field asymmetry significantly affects the cutoff frequencies and stability of trapped MHD waves in slab configurations.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Steven M. Petrinec, Simon Wing, Jay R. Johnson, Yongliang Zhang
Summary: This study investigates the nature of large-scale fluctuations observed at the magnetosphere boundary and their connection to the post-noon high-latitude ionosphere.
FRONTIERS IN ASTRONOMY AND SPACE SCIENCES
(2022)
Article
Oceanography
Clare E. Reimers, Kristen E. Fogaren
Summary: This study combines different measurements to evaluate oxygen fluxes within the bottom boundary layer during winter on the Oregon shelf. Analysis showed that winter dynamics activate benthic respiration, leading to higher oxygen fluxes compared to summer. The spectral decomposition method revealed the significant contribution of wave frequencies to benthic oxygen fluxes.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Engineering, Marine
Renfu Fan, Hao Wei, Youyu Lu, Liang Zhao, Wei Zhao, Hongtao Nie
Summary: High-frequency measurements of tides, waves, and turbulence were conducted in Heini Bay, Yellow Sea during winter and summer seasons. The wave-turbulence decomposition revealed the relationship between the inertial subrange and tidal current and turbulence intensities. The flood-ebb tidal flows varied between the two seasons, depending on the presence of dense raft aquaculture. In summer, the TKE, TRS, and e increased with the tidal flow magnitude, while in winter, the presence of heavy kelp aquaculture reduced flow speeds and TRS but maintained high TKE and e.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Environmental Sciences
Bieito Fernandez Castro, Oscar Sepulveda Steiner, Deborah Knapp, Thomas Posch, Damien Bouffard, Alfred Wueest
Summary: The study explored the formation, persistence, and breakdown of harmful blooms of Planktothrix rubescens in Lake Zurich. Turbulent mixing played a significant role in the persistence of the thin layer during the summer, while nighttime convection was identified as the main mechanism driving the breakdown of the cyanobacterial layer in autumn.
Article
Environmental Sciences
Cintia L. Ramon, Hugo N. Ulloa, Tomy Doda, Damien Bouffard
Summary: The interaction between a uniform cooling rate at the lake surface and sloping bathymetry efficiently drives cross-shore water exchanges. This study examines how moderate winds affect convective cross-shore transport in lakes, revealing that wind can modify the convective circulation and enhance cross-shore exchange.
WATER RESOURCES RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Bieito Fernandez Castro, Marian Pena, Enrique Nogueira, Miguel Gilcoto, Esperanza Broullon, Antonio Comesana, Damien Bouffard, Alberto C. Naveira Garabato, Beatriz Mourino-Carballido
Summary: Research shows that turbulent mixing generated by the swimming activity of marine organisms can be as efficient as geophysical turbulence, enhancing vertical mixing in the ocean. This has significant implications for productive upper ocean regions.
Article
Multidisciplinary Sciences
Sapna Sharma, Alessandro Filazzola, Thi Nguyen, M. Arshad Imrit, Kevin Blagrave, Damien Bouffard, Julia Daly, Harley Feldman, Natalie Felsine, Harrie-Jan Hendricks-Franssen, Nikolay Granin, Richard Hecock, Jan Henning L'Abee-Lund, Ed Hopkins, Neil Howk, Michael Iacono, Lesley B. Knoll, Johanna Korhonen, Hilmar J. Malmquist, Wlodzimierz Marszelewski, Shin-Ichiro S. Matsuzaki, Yuichi Miyabara, Kiyoshi Miyasaka, Alexander Mills, Lolita Olson, Theodore W. Peters, David C. Richardson, Dale M. Robertson, Lars Rudstam, Danielle Wain, Holly Waterfield, Gesa A. Weyhenmeyer, Brendan Wiltse, Huaxia Yao, Andry Zhdanov, John J. Magnuson
Summary: In recent years, the accelerated ice loss in lakes has had significant impacts on winter ecological processes. Through interdisciplinary integration, we can enhance our understanding of the spatial and temporal patterns of ice loss and its consequences. The inclusion of lake ice records in future studies will contribute to harmonizing observations across different regions and facilitate interdisciplinary research.
Correction
Multidisciplinary Sciences
Sapna Sharma, Alessandro Filazzola, Thi Nguyen, M. Arshad Imrit, Kevin Blagrave, Damien Bouffard, Julia Daly, Harley Feldman, Natalie Feldsine, Harrie-Jan Hendricks-Franssen, Nikolay Granin, Richard Hecock, Jan Henning L'Abee-Lund, Ed Hopkins, Neil Howk, Michael Iacono, Lesley B. Knoll, Johanna Korhonen, Hilmar J. Malmquist, Wlodzimierz Marszelewski, Shin-Ichiro S. Matsuzaki, Yuichi Miyabara, Kiyoshi Miyasaka, Alexander Mills, Lolita Olson, Theodore W. Peters, David C. Richardson, Dale M. Robertson, Lars Rudstam, Danielle Wain, Holly Waterfield, Gesa A. Weyhenmeyer, Brendan Wiltse, Huaxia Yao, Andry Zhdanov, John J. Magnuson
Article
Geosciences, Multidisciplinary
T. Doda, H. N. Ulloa, C. L. Ramon, A. Wuest, D. Bouffard
Summary: This research demonstrates the impact of the interaction between penetrative convection and downslope gravity currents on the fluid dynamics and transport in littoral aquatic systems. The study reveals that convective plumes can penetrate gravity currents, leading to large vertical fluctuations that enhance vertical mixing and erode the stratified flow, thus limiting basin-scale transport.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Limnology
Maciej Bartosiewicz, Jessica Venetz, Saskia Laeubli, Oscar Sepulveda Steiner, Damien Bouffard, Jakob Zopfi, Moritz F. F. Lehmann
Summary: The study reveals the existence of methane paradox in oxygenated waters of a lake and identifies the factors contributing to the variability in its magnitude. It also suggests that methanogenesis in zooplankton detritus is stimulated through the addition of methylphosphonate.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Limnology
Pascal Perolo, Nicolas Escoffier, Hannah E. Chmiel, Gael Many, Damien Bouffard, Marie-Elodie Perga
Summary: In alkaline freshwater systems, bicarbonates can support gross primary production (GPP) even at low CO2 concentrations. However, the contribution of bicarbonates to GPP in lakes has not been quantified throughout the seasons. This study analyzes the daily stoichiometric ratios of CO2-O-2 and alkalinity-O-2 in a deep hardwater lake, revealing that alkalinity is the dominant inorganic carbon source for GPP in both littoral and pelagic environments during the stratified period.
LIMNOLOGY AND OCEANOGRAPHY LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Olivia Desgue-Itier, Laura Melo Vieira Soares, Orlane Anneville, Damien Bouffard, Vincent Chanudet, Pierre Alain Danis, Isabelle Domaizon, Jean Guillard, Theo Mazure, Najwa Sharaf, Frederic Soulignac, Viet Tran-Khac, Brigitte Vincon-Leite, Jean-Philippe Jenny
Summary: The long-term effects of climate change on lakes globally include substantial changes in thermal regime and oxygen solubility, which can alter ecosystem processes, habitats, and substance concentrations. Although long-term model projections of climate change effects on lakes have been developed, they are rarely compared with multi-decade observations. Additionally, global-scale forcing parameters in lake models have limitations that require significant downscaling. In this study, the effects of climate change on thermal regime and oxygen solubility were analyzed in the four largest French peri-alpine lakes over a period of 1850-2100. The results indicate a critical alteration in lake thermal and oxygen conditions in the coming decades and underscore the need for better integration of long-term lake observatories data and lake models to anticipate climate effects on lake thermal regimes and habitats.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Artur Safin, Damien Bouffard, Firat Ozdemir, Cintia L. Ramon, James Runnalls, Fotis Georgatos, Camille Minaudo, Jonas Sukys
Summary: In this study, a new Bayesian inference method is proposed for constructing a three-dimensional model of lakes, considering stochastic weather and high-frequency observational data. By combining Bayesian inference with hydrodynamics software, uncertainty in atmospheric forcing is mitigated, and a bidirectional long short-term memory neural network is used to improve uncertainty quantification in the particle filter.
GEOSCIENTIFIC MODEL DEVELOPMENT
(2022)
Article
Geosciences, Multidisciplinary
Tomy Doda, Cintia L. Ramon, Hugo N. Ulloa, Alfred Wuest, Damien Bouffard
Summary: This study focuses on the seasonality of lateral transport induced by thermal siphons (TSs) and investigates how seasonally varying forcing conditions control the occurrence and intensity of TSs. Observations from Rotsee, a wind-sheltered temperate lake, show that TSs occur frequently in autumn and efficiently flush the littoral region. The results also reveal a decrease in lateral transport by a factor of 2 due to seasonal changes, and the timing of TSs relates to daily heating and cooling phases.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Marco Toffolon, Luca Cortese, Damien Bouffard
Summary: The freezing time in lakes is predicted through complex mechanistic models or simplified statistical regressions. The SELF model, based on energy balance involving cooling of water and wind-driven mixing, explains the dynamics of inverse stratification. The model suggests a power law dependence of pre-freezing duration on energy fluxes.
GEOSCIENTIFIC MODEL DEVELOPMENT
(2021)
Article
Geosciences, Multidisciplinary
Pascal Perolo, Bieito Fernandez Castro, Nicolas Escoffier, Thibault Lambert, Damien Bouffard, Marie-Elodie Perga
Summary: The gas transfer velocity (k) is a major source of uncertainty in assessing lake-atmosphere gas exchange. Existing models vary in predictions, with turbulence level near the air-water interface being a key factor affecting transfer rates. Wind shear and buoyancy-driven convection contribute to near-surface turbulence, impacting gas transfer in lakes.
EARTH SYSTEM DYNAMICS
(2021)
Article
Environmental Sciences
Bieito Fernandez Castro, Damien Bouffard, Cary Troy, Hugo N. Ulloa, Sebastiano Piccolroaz, Oscar Sepulveda Steiner, Hannah E. Chmiel, Lucas Serra Moncadas, Sebastien Lavanchy, Alfred Wuest
Summary: Turbulent mixing in Lake Geneva is strongest in the interior water-column during the summer season, as stratification limits wind-driven mixing near the sediment. These results provide insight for anticipating the effects of climate change on freshwater quality and ecosystem services in large lakes, as stratified conditions become more prevalent.
COMMUNICATIONS EARTH & ENVIRONMENT
(2021)
Article
Environmental Sciences
Love Raman Vinna, Iselin Medhaug, Martin Schmid, Damien Bouffard
Summary: Studies on the climate warming of lakes along altitudinal gradients in the 21st century have been partly obscured by unresolved local atmospheric phenomena, however, using downscaled climate models under different future scenarios can help understand the potential impacts. Results suggest significant changes in ice-cover duration and stratification duration in lakes under the worst-case scenario, with the possibility of shift in mixing regimes in some lakes if stringent measures are not taken.
COMMUNICATIONS EARTH & ENVIRONMENT
(2021)
