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Communication Dans Un Congrès Année : 2019

Using combined airborne high spectral resolution and differential absorption lidar and cloud radar measurements for cirrus cloud characterization

Résumé

Clouds still introduce large uncertainties in climate change predictions. Amongst them, high altitude ice clouds have an important contribution to the Earth's radiation budget. But their radiative properties strongly depend on the optical and microphysical properties, e.g. size and shape of the constituting particles, which are determined by environmental conditions like temperature and humidity. They can change during the cloud's life-cycle or be influenced by aerosols. It is thus important to study cirrus cloud microphysical properties, as well as their interrelation to the environmental conditions and the cloud evolution. Airborne high spectral resolution lidar (HSRL) and water vapor differential absorption lidar (DIAL) measurements provide 2-D information of cloud optical properties and the humidity distribution along the flight path. In synergy with airborne cloud-radar measurements they provide information on the cloud microphysical properties. Onboard the German research aircraft HALO the combined water vapor DIAL and HSRL system WALES was employed together with a 35 GHz cloud radar during a set of field experiments. The lidar system measures the water vapor concentration using four wavelengths in the water vapor absorption band around 935 nm and is additionally equipped with polarization sensitive detection channels at 532 nm and 1064 nm; the first one with HSRL capability. Co-located measurements with the cloud radar allow synergistic investigations of cloud properties. To do this we use an optimal estimation approach. This unique combination of lidar and radar measurements of the water vapor, optical and microphysical properties is used to study ice cloud properties, as well as their dependence on the environmental conditions and stage of evolution. In our presentation we will introduce the airborne lidar and radar systems, and the synergistic ice cloud retrieval. We will show first results of combined optical and microphysical properties to study their relation and dependence on the cirrus cloud state of evolution. We found that the relative humidity distribution inside the cirrus cloud, as well as the vertical distribution of the size of the ice particles and the ice water content differs for different ice clouds dependent on their expected stage of evolution and/or environmental conditions.
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Dates et versions

insu-04450759 , version 1 (10-02-2024)

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S. Gross, F. Ewald, M. Wirth, Julien Delanoë. Using combined airborne high spectral resolution and differential absorption lidar and cloud radar measurements for cirrus cloud characterization. American Geophysical Union, Fall Meeting 2019, Dec 2019, San Francisco, United States. pp.abstract #A43D-07. ⟨insu-04450759⟩
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