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My main research interest is the non-adiabatic change of atmospheric flow, with special attention to warm conveyor belts.
A warm conveyor belt (WCB) is a strong ascending air flow within an extratropical cyclone. They originate in the warm part of the cyclone and then rise to the upper troposphere. During the ascent, clouds are forming. Therefore, the WCB can be seen in the satellite image as a slender cloud band in front of the cold front (see Figure 1). During cloud formation, many microphysical processes occur, such as condensation, freezing, or deposition growth (direct transfer from gas to solid). These processes lead to the release of latent heat, which further enhances the rise of WCB.
The release of latent heat in the updraft can change the potential vorticity (PV). In the first sequence, PV is generated below the maximum heating and destroyed above. Therefore, WCB produces positive PV anomalies in the middle troposphere and negative anomalies in the upper troposphere. These PV anomalies generated or enhanced by microphysical processes may change large-scale and mesoscale flows, and may also be important to the evolution of cyclones.
Another research interest is on cirrus clouds. These are clouds that consist purely of ice crystals and have the potential to strongly modify the Earth radiative budget. Depending on their microphysical properties like the ice water content or the ice crystal number concentration, they can lead to a cooling or warming. The microphysical properties are in turn determined by the dynamical forcing and the thermodynamical environment. The vertical velocity under which the cloud forms, strongly determines the ice crystal number concentration. The relative humidity with respect to ice has also an influence on the ice crystal number concentration but also on the ice water content of the cloud. This complicated interaction of dynamical and thermodynamical processes on different scales is not fully understood. Therefore it is important to investigate the formation mechanisms of cirrus clouds as well as their representation in climate models.
A warm conveyor belt (WCB) is a strong ascending air flow within an extratropical cyclone. They originate in the warm part of the cyclone and then rise to the upper troposphere. During the ascent, clouds are forming. Therefore, the WCB can be seen in the satellite image as a slender cloud band in front of the cold front (see Figure 1). During cloud formation, many microphysical processes occur, such as condensation, freezing, or deposition growth (direct transfer from gas to solid). These processes lead to the release of latent heat, which further enhances the rise of WCB.
The release of latent heat in the updraft can change the potential vorticity (PV). In the first sequence, PV is generated below the maximum heating and destroyed above. Therefore, WCB produces positive PV anomalies in the middle troposphere and negative anomalies in the upper troposphere. These PV anomalies generated or enhanced by microphysical processes may change large-scale and mesoscale flows, and may also be important to the evolution of cyclones.
Another research interest is on cirrus clouds. These are clouds that consist purely of ice crystals and have the potential to strongly modify the Earth radiative budget. Depending on their microphysical properties like the ice water content or the ice crystal number concentration, they can lead to a cooling or warming. The microphysical properties are in turn determined by the dynamical forcing and the thermodynamical environment. The vertical velocity under which the cloud forms, strongly determines the ice crystal number concentration. The relative humidity with respect to ice has also an influence on the ice crystal number concentration but also on the ice water content of the cloud. This complicated interaction of dynamical and thermodynamical processes on different scales is not fully understood. Therefore it is important to investigate the formation mechanisms of cirrus clouds as well as their representation in climate models.
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crossref(2024)
Jonathan Wille, Simon P. Alexander,Charles Amory,Rebecca Baiman, Léonard Barthelemy,Dana M. Bergstrom,Alexis Berne,Hanin Binder, Juliette Blanchet,Deniz Bozkurt,Thomas J. Bracegirdle,Mathieu Casado,
Journal of Climate (2023)
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Weather and Climate Dynamicsno. 1 (2023): 19-37
Weather and Climate Dynamicsno. 1 (2023): 133-155
Jonathan Wille, Simon P. Alexander,Charles Amory,Rebecca Baiman, Léonard Barthelemy,Dana M. Bergstrom,Alexis Berne,Hanin Binder, Juliette Blanchet,Deniz Bozkurt,Thomas J. Bracegirdle, Mathieu Casado,
Journal of Climate (2023)
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