Lea Raillard
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View article: Modeling the Coupled and Decoupled states of PolarBoundary-Layer Mixed-Phase Clouds
Modeling the Coupled and Decoupled states of PolarBoundary-Layer Mixed-Phase Clouds Open
Representing mixed-phase clouds (MPCs) is a long-standing challenge for climate models, with major consequences regarding the simulation of radiative fluxes at high-latitudes and uncertainties in future cryosphere melting estimates. Low-le…
View article: A turbulence-informed parameterization of phase partitioning in stratiform mixed-phase clouds for the ICOLMDZ model
A turbulence-informed parameterization of phase partitioning in stratiform mixed-phase clouds for the ICOLMDZ model Open
High-latitude clouds, present over the Arctic Ocean, the Southern Ocean and the Antarctic continent, are very often. Despite being essential for the climate of the poles, they remain a major modelling challenge for climate models. In this…
View article: Advanced precipitation scheme in ICOLMDZ with improved microphysics and subgrid cloud-hydrometeor interactions to better simulate polar precipitation
Advanced precipitation scheme in ICOLMDZ with improved microphysics and subgrid cloud-hydrometeor interactions to better simulate polar precipitation Open
The current assessment of the ice sheet surface mass balance and more generally of the atmospheric branch of the high latitude water cycles mostly relies on climate model simulations. The ability of climate models to reproduce the polar pr…
View article: A turbulence-based parameterization for phase partitioning in stratiform mixed phase clouds in the ICOLMDZ model
A turbulence-based parameterization for phase partitioning in stratiform mixed phase clouds in the ICOLMDZ model Open
High-latitude clouds, commonly found over the Arctic Ocean, the Southern Ocean, and the Antarctic continent, are frequently mixed-phase clouds (MPCs) containing both liquid water and ice crystals. The distribution between the ice and liqui…
View article: The THINICE Field Campaign: Interactions between Arctic Cyclones, Tropopause Polar Vortices, Clouds, and Sea Ice in Summer
The THINICE Field Campaign: Interactions between Arctic Cyclones, Tropopause Polar Vortices, Clouds, and Sea Ice in Summer Open
The THINICE field campaign, based in Svalbard in August 2022, provided unique observations of summertime Arctic cyclones, their coupling with cloud cover, and their interactions with tropopause polar vortices and sea ice conditions. THINIC…
View article: Designing a Fully‐Tunable and Versatile TKE‐l Turbulence Parameterization for the Simulation of Stable Boundary Layers
Designing a Fully‐Tunable and Versatile TKE‐l Turbulence Parameterization for the Simulation of Stable Boundary Layers Open
This study presents the development of a so‐called Turbulent Kinetic Energy (TKE)‐l, or TKE‐l, parameterization of the diffusion coefficients for the representation of turbulent diffusion in neutral and stable conditions in large‐scale atm…
View article: Leveraging RALI‐THINICE Observations to Assess How the ICOLMDZ Model Simulates Clouds Embedded in Arctic Cyclones
Leveraging RALI‐THINICE Observations to Assess How the ICOLMDZ Model Simulates Clouds Embedded in Arctic Cyclones Open
Despite their essential role in the high‐latitude climate, the representation of mixed‐phase clouds is still a challenge for Global Climate Models (GCMs)'s cloud schemes. In this study we propose a methodology for robustly assessing Arctic…
View article: Arctic September Sea Ice Concentration Biases in CMIP6 Models and Their Relationships with Other Model Variables
Arctic September Sea Ice Concentration Biases in CMIP6 Models and Their Relationships with Other Model Variables Open
The models that participated in the Coupled Model Intercomparison Project (CMIP) exhibit large biases in Arctic sea ice climatology that seem related to biases in seasonal atmospheric and oceanic circulations. Using historical runs of 34 C…
View article: Designing a fully-tunable and versatile TKE-l turbulence parameterization for atmospheric models
Designing a fully-tunable and versatile TKE-l turbulence parameterization for atmospheric models Open
This study presents the development of a TKE-l parameterization of the diffusion coefficients for the representation of turbulent diffusion in neutral and stable conditions in large-scale atmospheric models. The parameterization has been c…
View article: Ice fog observed at cirrus temperatures at Dome C, Antarctic Plateau
Ice fog observed at cirrus temperatures at Dome C, Antarctic Plateau Open
As the near-surface atmosphere over the Antarctic Plateau is cold and pristine, its physico-chemical conditions resemble to a certain extent those of the high troposphere where cirrus clouds form. In this paper, we carry out an observation…
View article: Comment on egusphere-2022-544
Comment on egusphere-2022-544 Open
As the near-surface atmosphere over the Antarctic Plateau is cold and pristine, its physico-chemical conditions resemble to a certain extent those of the high-troposphere where cirrus clouds form. In this paper, we carry out an observation…
View article: Ice fog observed at cirrus temperatures at Dome C, Antarctic Plateau
Ice fog observed at cirrus temperatures at Dome C, Antarctic Plateau Open
As the near-surface atmosphere over the Antarctic Plateau is cold and pristine, its physico-chemical conditions resemble to a certain extent those of the high-troposphere where cirrus clouds form. In this paper, we carry out an observation…