EGU General Assembly 2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Overview and first analysis of the in situ microphysical measurement dataset collected during the CADDIWA mission

Pierre Coutris1, Guy Febvre1, Louis Jaffeux1, Clément Bazantay1, Clémantyne Aubry2,3, Christophe Caudoux2, Julien Delanoë2, Alfons Schwarzenboeck1, and Cyrille Flamant1
Pierre Coutris et al.
  • 1Laboratoire de Météorologie Physique, UCA/CNRS, Aubière, France (
  • 2Laboratoire Atmosphères, Observations Spatiales, CNRS/UVSQ/Sorbonne Université/Université Paris Saclay, Paris, France
  • 3Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany

In the frame of the Joint Aeolus Tropical Atlantic Campaigns, an airborne field campaign took place in Sal island of Cape-Verde from the 8th to 21st of September 2021, as part of the French CADDIWA mission. During this campaign, the SAFIRE F20 research aircraft equipped with in situ and remote sensing instruments performed nine 3 to 4 hour long flights sampling tropical environment underneath AEOLUS satellite tracks and performing exploration flights within the convective cloud systems of tropical disturbances. In this study, an overview of the available aerosol and cloud in situ dataset is given first, presenting the instrumental and methodological approaches relevant to the collection of data from a set of four instruments: the UHSAS (aerosol size range : 40 – 1000 nm,  Cai et al. 2008), the SPP-300 (aerosol 0.3 – 20 µm, Baumgardner 1992) and the CDP-2 (droplets 2-50 µm, Lance et al. 2010) scattering probes, and the 2D-S imager (10-1280 µm, Lawson et al. 2006). Then a detailed microphysical analysis is conducted on two case studies: a tropical perturbation referred to as Pierre-Henri in this study (unnamed/numbered by NOAA National Hurricane Center (NHC)), sampled during F20 flight #7/8, and the Tropical Storm Rose (# AL172021 according to NOAA NHC) sampled during flights #12/13. The analysis includes a discussion on the main microphysical properties such as Particle Size Distribution (PSD), Ice Water Content (IWC) retrieved at different locations in the cloud convective systems, complemented by 95GHz reflectivity and Doppler vertical velocity measured by the airborne cloud radar RASTA (Delanoe et al. 2013). The data supporting this study is illustrated in the figure below: the vertical velocity (derived from 3 Doppler non colinear measurements of the radar) and PSD time series are given on top of two samples ice crystal images taken by the 2DS imager at different location in the TS Rose. A newly developed image classification algorithm (Jaffeux et al. 2022) is applied to the 2D-S data to derive statistics on the ice particles morphological properties, yielding to a discussion on the microphysical ice growth processes occurring in these systems.

How to cite: Coutris, P., Febvre, G., Jaffeux, L., Bazantay, C., Aubry, C., Caudoux, C., Delanoë, J., Schwarzenboeck, A., and Flamant, C.: Overview and first analysis of the in situ microphysical measurement dataset collected during the CADDIWA mission, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-13084,, 2023.