Marc Mallet
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View article: Aerosol acidity controls methanesulfonic acid evaporation from aerosols during Antarctic katabatic outflow
Aerosol acidity controls methanesulfonic acid evaporation from aerosols during Antarctic katabatic outflow Open
Methanesulfonic acid, a key oxidation product of dimethyl sulfide, plays a crucial role in the atmospheric sulfur cycle and is an important contributor to aerosol growth and cloud condensation nuclei formation in remote marine and polar at…
View article: Constraining Atmospheric Methanethiol Estimates Over the Southern Ocean
Constraining Atmospheric Methanethiol Estimates Over the Southern Ocean Open
Dimethyl sulfide (DMS) and methanethiol (MeSH) are biologically co‐produced marine volatile sulfur compounds, which play a critical role in climate‐cooling aerosol formation. The spatio‐temporal distributions of MeSH are poorly constrained…
View article: Synergy of active and passive airborne observations for heating rate calculation during the AEROCLO-sA field campaign in Namibia
Synergy of active and passive airborne observations for heating rate calculation during the AEROCLO-sA field campaign in Namibia Open
Aerosols have important effects on both local and global climate, as well as on clouds and precipitations. We present original results derived from the airborne observations acquired from the AErosol RadiatiOn and CLOud in Southern Africa …
View article: Simulating aerosol and cloud properties over coastal Antarctica in a high resolution regional model
Simulating aerosol and cloud properties over coastal Antarctica in a high resolution regional model Open
Global climate models and reanalysis products have revealed large downwelling shortwave radiation biases over the Southern Ocean and Antarctica. The biases are hypothesized to be caused by the incapability of models to accurately simulate …
View article: Impact of biomass burning aerosols (BBA) on the tropical African climate in an ocean–atmosphere–aerosol coupled climate model
Impact of biomass burning aerosols (BBA) on the tropical African climate in an ocean–atmosphere–aerosol coupled climate model Open
The impact of biomass burning aerosols (BBA) emitted in central Africa on the tropical African climate is studied using the ocean–atmosphere global climate model CNRM-CM, including prognostic aerosols. The direct BBA forcing, cloud feedbac…
View article: The ACCESS-AM2 climate model strongly underestimates aerosol concentration in the Southern Ocean, but improving it could be problematic for the modelled climate system
The ACCESS-AM2 climate model strongly underestimates aerosol concentration in the Southern Ocean, but improving it could be problematic for the modelled climate system Open
The interaction of natural marine aerosol with clouds and radiation is a significant source of climate model uncertainty. The Southern Ocean represents a key area to understand these interactions, and a region where significant model biase…
View article: Synergy of active and passive airborne observations for heating rates calculation during the AEROCLO-SA field campaign in Namibia
Synergy of active and passive airborne observations for heating rates calculation during the AEROCLO-SA field campaign in Namibia Open
Aerosols have important effects on both local and global climate, as well as on clouds and precipitations. We present some original results of the airborne AErosol RadiatiOn and CLOud in Southern Africa (AEROCLO-sA) field campaign led in N…
View article: Cloud Properties and Boundary Layer Stability Above Southern Ocean Sea Ice and Coastal Antarctica
Cloud Properties and Boundary Layer Stability Above Southern Ocean Sea Ice and Coastal Antarctica Open
Significant variability in climate predictions originates from the simulated cloud cover over the Southern Ocean. Historically, Southern Ocean cloud and aerosol properties have been less studied than their northern hemisphere counterparts,…
View article: Spatial variability and future evolution of surface solar radiation over Northern France and Benelux: a regional climate model approach
Spatial variability and future evolution of surface solar radiation over Northern France and Benelux: a regional climate model approach Open
Improving knowledge of current and future spatio-temporal variability of surface solar radiation is essential in the context of climate change and associated environmental and societal issues. Such an evolution will be influenced by change…
View article: A machine learning approach for evaluating Southern Ocean cloud radiative biases in a global atmosphere model
A machine learning approach for evaluating Southern Ocean cloud radiative biases in a global atmosphere model Open
The evaluation and quantification of Southern Ocean cloud–radiation interactions simulated by climate models are essential in understanding the sources and magnitude of the radiative bias that persists in climate models for this region. To…
View article: Assessment of human and meteorological influences on PM10 concentrations: Insights from machine learning algorithms
Assessment of human and meteorological influences on PM10 concentrations: Insights from machine learning algorithms Open
Air pollution prediction assists residents in planning activities and avoiding regions with elevated pollution levels. This study employed Random Forest (RF), Extreme Gradient Boosting (XGB), and Histogram-Based Gradient Boosting (HistGB) …
View article: Using XGBoost & SHAP feature importance to understand the drivers of the Southern Ocean cloud-radiation bias
Using XGBoost & SHAP feature importance to understand the drivers of the Southern Ocean cloud-radiation bias Open
The Southern Ocean radiation bias has been a multigenerational problem in climate and weather models. This radiation bias, where too much sunlight is allowed to reach the surface, has been attributed to the incorrect simulation of cloud pr…
View article: BIOGEOCHEMICAL dataset collected during the PEACETIME cruise
BIOGEOCHEMICAL dataset collected during the PEACETIME cruise Open
The general objective of the PEACETIME cruise is to study the fundamental processes and their interactions at the ocean-atmosphere interface, occurring after atmospheric deposition (especially Saharan dust) in the Mediterranean Sea, and ho…
View article: Assessing the cloud radiative bias at Macquarie Island in the ACCESS-AM2 model
Assessing the cloud radiative bias at Macquarie Island in the ACCESS-AM2 model Open
As a long-standing problem in climate models, large positive shortwave radiation biases exist at the surface over the Southern Ocean, impacting the accurate simulation of sea surface temperature, atmospheric circulation, and precipitation.…
View article: Why Are Clouds Over the Southern Ocean Super-Cool?
Why Are Clouds Over the Southern Ocean Super-Cool? Open
When water drops below 0° Celsius, we assume it turns to ice. This is not always true though, especially inside of some clouds over the Southern Ocean. When water exists as a liquid below 0°C, it is known as super-cooled liquid water. Wate…
View article: Comment on egusphere-2023-531
Comment on egusphere-2023-531 Open
Abstract. The evaluation and quantification of Southern Ocean cloud-radiation interactions simulated by climate models is essential in understanding the sources and magnitude of the radiative bias that persists in climate models for this r…
View article: Comment on egusphere-2023-531
Comment on egusphere-2023-531 Open
Abstract. The evaluation and quantification of Southern Ocean cloud-radiation interactions simulated by climate models is essential in understanding the sources and magnitude of the radiative bias that persists in climate models for this r…
View article: A machine learning approach for evaluating Southern Oceancloud-radiative biases in a global atmosphere model
A machine learning approach for evaluating Southern Oceancloud-radiative biases in a global atmosphere model Open
The evaluation and quantification of Southern Ocean cloud-radiation interactions simulated by climate models is essential in understanding the sources and magnitude of the radiative bias that persists in climate models for this region. To …
View article: Comment on egusphere-2023-349
Comment on egusphere-2023-349 Open
Abstract. As a long-standing problem in climate models, large positive shortwave radiation biases exist at the surface over the Southern Ocean, impacting the accurate simulation of sea surface temperature, atmospheric circulation, and prec…
View article: Assessing the cloud radiative bias at Macquarie Island in the ACCESS-AM2 model
Assessing the cloud radiative bias at Macquarie Island in the ACCESS-AM2 model Open
As a long-standing problem in climate models, large positive shortwave radiation biases exist at the surface over the Southern Ocean, impacting the accurate simulation of sea surface temperature, atmospheric circulation, and precipitation.…
View article: Synergy of active and passive airborne observations for the evaluation of the radiative impacts of aerosols. Application to the AEROCLO-SA field campaign in Namibia
Synergy of active and passive airborne observations for the evaluation of the radiative impacts of aerosols. Application to the AEROCLO-SA field campaign in Namibia Open
Aerosols have important effects on both local and global climate, as well as on clouds and precipitations. We present here some original results of the AErosol RadiatiOn and CLOud in Southern Africa (AEROCLO-sA) field campaign led in Namib…
View article: Reducing Southern Ocean Shortwave Radiation Errors in the ERA5 Reanalysis with Machine Learning and 25 Years of Surface Observations
Reducing Southern Ocean Shortwave Radiation Errors in the ERA5 Reanalysis with Machine Learning and 25 Years of Surface Observations Open
Earth system models struggle to simulate clouds and their radiative effects over the Southern Ocean, partly due to a lack of measurements and targeted cloud microphysics knowledge. We have evaluated biases of downwelling shortwave radiatio…
View article: Untangling the influence of Antarctic and Southern Ocean life on clouds
Untangling the influence of Antarctic and Southern Ocean life on clouds Open
Polar environments are among the fastest changing regions on the planet. It is a crucial time to make significant improvements in our understanding of how ocean and ice biogeochemical processes are linked with the atmosphere. This is espec…
View article: Southern Ocean cloud and shortwave radiation biases in a nudged climate model simulation: does the model ever get it right?
Southern Ocean cloud and shortwave radiation biases in a nudged climate model simulation: does the model ever get it right? Open
The Southern Ocean radiative bias continues to impact climate and weather models, including the Australian Community Climate and Earth System Simulator (ACCESS). The radiative bias, characterised by too much shortwave radiation reaching th…
View article: On the differences in the vertical distribution of modeled aerosol optical depth over the southeast Atlantic
On the differences in the vertical distribution of modeled aerosol optical depth over the southeast Atlantic Open
The southeast Atlantic is home to an expansive smoke aerosol plume overlying a large cloud deck for approximately a third of the year. The aerosol plume is mainly attributed to the extensive biomass burning activity that occurs in southern…