Odran Sourdeval
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View article: Key Gaps in Models' Physical Representation of Climate Intervention and Its Impacts
Key Gaps in Models' Physical Representation of Climate Intervention and Its Impacts Open
Solar radiation modification (SRM) is increasingly discussed as a potential method to ameliorate some negative effects of climate change. However, unquantified uncertainties in physical and environmental impacts of SRM impede informed deba…
View article: Study of optical scattering properties and direct radiative effects of high-altitude cirrus clouds in Barcelona, Spain, with 4 years of lidar measurements
Study of optical scattering properties and direct radiative effects of high-altitude cirrus clouds in Barcelona, Spain, with 4 years of lidar measurements Open
Cloud–radiation interaction still drives large uncertainties in climate models, and its estimation is key to make more accurate predictions. In this context, high-altitude cirrus clouds play a fundamental role because (1) they have a high …
View article: Investigating ice formation pathways in satellite-observed cirrus clouds using Lagrangian microphysical modelling
Investigating ice formation pathways in satellite-observed cirrus clouds using Lagrangian microphysical modelling Open
Understanding the formation mechanisms of ice clouds is challenging due to their complex composition and diverse growth processes. Observational constraints have historically been limited, resulting in significant gaps in our understanding…
View article: Global analysis of cirrus origins using satellite observations and Lagrangian trajectories
Global analysis of cirrus origins using satellite observations and Lagrangian trajectories Open
In addition to their formation mechanisms, the origin of cirrus clouds (liquid-origin or in situ) can significantly influence their microphysical and radiative properties. Liquid-origin cirrus, which form through the freezing of water drop…
View article: Disentangle Aerosol-Cloud-Interactions (ACIs) using a new Aerosol-Cloud Data Base from Passive Remote Sensors and Reanalysis
Disentangle Aerosol-Cloud-Interactions (ACIs) using a new Aerosol-Cloud Data Base from Passive Remote Sensors and Reanalysis Open
Aerosol-Cloud Interactions (ACIs) remain a major uncertainty in climate predictions. While satellites provide valuable climatology to constrain ACIs and estimate their radiative forcing (e.g., Twomey effect), discrepancies among studies an…
View article: Impacts of Wildfire Smoke on Cirrus Cloud Formation
Impacts of Wildfire Smoke on Cirrus Cloud Formation Open
The increasing prevalence of wildfire smoke layers in the upper troposphere and lower stratosphere, likely driven by climate change, highlights their growing influence on the climate system. These smoke plumes travel across continents affe…
View article: Emulation of Forward Modeled Top-of-Atmosphere MODIS-Based Spectral Channels Using Machine Learning
Emulation of Forward Modeled Top-of-Atmosphere MODIS-Based Spectral Channels Using Machine Learning Open
Satellites provide invaluable data regarding climate and weather patterns on a global scale. Satellite observations are crucial in studies aimed at understanding and monitoring the Earth's atmosphere and surface properties. The forward mod…
View article: Study of radiative properties and effects of high-altitude cirrus clouds in Barcelona, Spain with 4 years of lidar measurements
Study of radiative properties and effects of high-altitude cirrus clouds in Barcelona, Spain with 4 years of lidar measurements Open
Cloud-radiation interaction still drives large uncertainties in climate models and its estimation is key to make more accurate predictions. In this context, the high-altitude cirrus clouds play a fundamental role, because 1) they have a hi…
View article: Characterisation of low-base and mid-base clouds and their thermodynamic phase over the Southern Ocean and Arctic marine regions
Characterisation of low-base and mid-base clouds and their thermodynamic phase over the Southern Ocean and Arctic marine regions Open
The thermodynamic phase of clouds in low and middle levels over the Southern Ocean and the Arctic marine regions is poorly known, leading to uncertainties in the radiation budget in weather and climate models. To improve the knowledge of t…
View article: Subgrid-scale variability of cloud ice in the ICON-AES 1.3.00
Subgrid-scale variability of cloud ice in the ICON-AES 1.3.00 Open
This paper presents a stochastic approach for the aggregation process rate in the ICOsahedral Nonhydrostatic general circulation model (ICON-AES), which takes subgrid-scale variability into account. This method creates a stochastic paramet…
View article: Investigating the Impact of Aerosols on Liquid-Origin Cirrus from Global Observations and Reanalysis Data
Investigating the Impact of Aerosols on Liquid-Origin Cirrus from Global Observations and Reanalysis Data Open
Complementarily to their formation mechanism, the origin of cirrus (liquid or in-situ) can substantially affect their microphysical and radiative properties. Liquid-origin cirrus, which stem from the freezing of water droplets at cirrus te…
View article: Exploring ice cloud formation mechanisms through satellite observations and integrated Lagrangian transport with microphysical models
Exploring ice cloud formation mechanisms through satellite observations and integrated Lagrangian transport with microphysical models Open
Understanding the formation mechanisms of ice clouds has been hindered by the complexity of their composition and the diversity of their growth processes. Previously, observational constraints have been limited, leading to substantial gaps…
View article: Spatial Aggregation of Satellite Observations Leads to an Overestimation of the Radiative Forcing due to Aerosol-Cloud Interactions
Spatial Aggregation of Satellite Observations Leads to an Overestimation of the Radiative Forcing due to Aerosol-Cloud Interactions Open
The estimation of cloud radiative forcing (RFaci), arising from aerosol-cloud interactions (also known as the first indirect effect), relies on approximating cloud albedo susceptibility (β) to changes in droplet concentration. β …
View article: Cloud Droplet Number Concentration: Satellite Retrievals Improved by Advanced Atmospheric Modelling
Cloud Droplet Number Concentration: Satellite Retrievals Improved by Advanced Atmospheric Modelling Open
The cloud droplet number concentration (CDNC) is one of the most important microphysical properties of liquid clouds for understanding and quantifying the effective radiative forcing by aerosol-cloud interactions (ERFaci). Indeed, CDNC is …
View article: Challenges in Measuring Aerosol Cloud-Mediated Radiative Forcing
Challenges in Measuring Aerosol Cloud-Mediated Radiative Forcing Open
Satellites are required for the global measurement of aerosol cloud-mediated radiative forcing, but satellite retrievals of aerosols and cloud properties still have challenges to overcome.
View article: Technical note: Bimodal parameterizations of in situ ice cloud particle size distributions
Technical note: Bimodal parameterizations of in situ ice cloud particle size distributions Open
The cloud particle size distribution (PSD) is a key parameter for the retrieval of microphysical and optical properties from remote-sensing instruments, which in turn are necessary for determining the radiative effect of clouds. Current re…
View article: Cirrus scenes in Barcelona, Spain: Geometrical and optical properties and radiative effects
Cirrus scenes in Barcelona, Spain: Geometrical and optical properties and radiative effects Open
For the first time, geometrical, optical and radiative properties of cirrus clouds, measured with a Polarized Micro Pulse Lidar (P-MPL) in Barcelona, have been analysed. For this purpose, the identification of cirrus scenes and the applica…
View article: Comment on gmd-2022-34
Comment on gmd-2022-34 Open
Abstract. This paper presents a stochastical approach for the aggregation process rate in the ICON-GCM, which takes subgrid-scale variability into account. This method creates a stochastic parameterisation of the process rate by choosing a…
View article: Subgrid-scale variability of cloud ice in the ICON-AES-1.3.00
Subgrid-scale variability of cloud ice in the ICON-AES-1.3.00 Open
This paper presents a stochastical approach for the aggregation process rate in the ICON-GCM, which takes subgrid-scale variability into account. This method creates a stochastic parameterisation of the process rate by choosing a new speci…
View article: Comment on egusphere-2023-2281
Comment on egusphere-2023-2281 Open
Abstract. The thermodynamic phase of clouds in low and middle levels over the Southern Ocean and the Arctic Ocean is poorly known, leading to uncertainties in the radiation budget in weather and climate models. To improve the knowledge of…
View article: Frontiers in Satellite‐Based Estimates of Cloud‐Mediated Aerosol Forcing
Frontiers in Satellite‐Based Estimates of Cloud‐Mediated Aerosol Forcing Open
Atmospheric aerosols affect the Earth's climate in many ways, including acting as the seeds on which cloud droplets form. Since a large fraction of these particles is anthropogenic, the clouds' microphysical and radiative characteristics a…
View article: Characterisation of low-base and mid-base clouds and their thermodynamic phase over the Southern and Arctic Ocean
Characterisation of low-base and mid-base clouds and their thermodynamic phase over the Southern and Arctic Ocean Open
The thermodynamic phase of clouds in low and middle levels over the Southern Ocean and the Arctic Ocean is poorly known, leading to uncertainties in the radiation budget in weather and climate models. To improve the knowledge of the cloud …
View article: Spatial Aggregation of Satellite Observations Leads to an Overestimation of the Radiative Forcing due to Aerosol‐Cloud Interactions
Spatial Aggregation of Satellite Observations Leads to an Overestimation of the Radiative Forcing due to Aerosol‐Cloud Interactions Open
The estimation of cloud radiative forcing due to aerosol‐cloud interactions, RF aci (also known as the first indirect effect), relies on approximating the cloud albedo susceptibility to changes in droplet concentration, β . β depends on th…
View article: Comment on egusphere-2023-754
Comment on egusphere-2023-754 Open
Abstract. The cloud particle size distribution (PSD) is a key parameter for the retrieval of micro-physical and optical properties from remote sensing instruments, which in turn are necessary for determining the radiative effect of clouds.…
View article: Technical note: Bimodal Parameterizations of in situ Ice Cloud Particle Size Distributions
Technical note: Bimodal Parameterizations of in situ Ice Cloud Particle Size Distributions Open
The cloud particle size distribution (PSD) is a key parameter for the retrieval of micro-physical and optical properties from remote sensing instruments, which in turn are necessary for determining the radiative effect of clouds. Current r…
View article: Orographic Cirrus and Its Radiative Forcing in NCAR CAM6
Orographic Cirrus and Its Radiative Forcing in NCAR CAM6 Open
Cirrus clouds play an important role in the Earth's radiative energy budget, thereby affecting the climate state and climate change. Orographic gravity wave (OGW)‐induced sub‐grid scale vertical velocity (i.e., cooling rate) is not resolve…
View article: Cloud Droplet Number Concentration: Satellite Retrievals Improved by Advanced Atmospheric Modelling
Cloud Droplet Number Concentration: Satellite Retrievals Improved by Advanced Atmospheric Modelling Open
<p>The cloud droplet number concentration (CDNC) is one of the most important microphysical properties of liquid clouds for understanding and quantifying the effective radiative forcing by aerosol-cloud interactions (ERFaci). Indeed,…
View article: Investigating ice cloud formation mechanisms from satellite observations and Lagrangian transport and microphysics models
Investigating ice cloud formation mechanisms from satellite observations and Lagrangian transport and microphysics models Open
Ice clouds are challenging because of the high complexity and diversity of their composition  (microphysics) as well as formation and growth processes. As a result, there has been little constraint from observations until recently, re…
View article: Sensitivity of Satellite Lidar-Radar Cirrus Retrievals to PSD Assumptions: DARDAR-Nice v2 and Simulator
Sensitivity of Satellite Lidar-Radar Cirrus Retrievals to PSD Assumptions: DARDAR-Nice v2 and Simulator Open
Ice clouds constitute a challenge to satellite remote-sensing due to the variability of their microphysical properties. A central parameter to understand and represent ice clouds in modelling as well as in remote-sensing is the ice particl…