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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
01 Feb 2017
Review status
A revision of this discussion paper was accepted for the journal Atmospheric Chemistry and Physics (ACP) and is expected to appear here in due course.
Vertical distribution of the phase state of particles in tropical deep-convective clouds as derived from cloud-side reflected solar radiation measurements
Evelyn Jäkel1, Manfred Wendisch1, Trismono C. Krisna1, Florian Ewald2,3, Tobias Kölling2, Tina Jurkat3, Christiane Voigt3, Micael A. Cecchini4, Luiz A. T. Machado4, Armin Afchine5, Anja Costa5, Martina Krämer5, Meinrat O. Andreae6,7, Ulrich Pöschl6, Daniel Rosenfeld8, and Tianle Yuan9 1Leipzig Institute for Meteorology (LIM), University of Leipzig, Germany
2Meteorological Institute, Ludwig-Maximilians-University Munich, Germany
3Institut für Physik der Atmosphäre, Deutsches Zentrum für Luft und Raumfahrt (DLR), Oberpfaffenhofen, Germany
4Center of Weather Forecast and Climates Studies (CPTEC), National Institute for Space Research (INPE), Sao Jose Dos Campos, Brazil
5Forschungszentrum Jülich, Jülich, Germany
6Max Planck Institute for Chemistry (MPIC), Mainz, Germany
7Scripps institution of Oceanography, University of California San Diego, La Jolla, California, USA
8Institute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
9NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
Abstract. Vertical profiles of the cloud particle phase state in tropical deep-convective clouds (DCCs) were investigated using airborne solar radiation data collected by the German research aircraft HALO during the ACRIDICON-CHUVA campaign, which was conducted over the Brazilian Amazon in September 2014. A phase discrimination retrieval based on imaging spec-troradiometer measurements of cloud side spectral reflectivity was applied to DCCs under different aerosol conditions. From the retrieval results the height of the mixed phase layer of the DCCs was determined. The retrieved profiles were compared with in situ measurements and satellite observations. It was found that the depth and vertical position of the mixed phase layer can vary up to 900 m for one single cloud scene. In particular, this variation is attributed to the different stages of cloud development in one scene. Clouds of mature or decaying stage are affected by falling ice particles resulting in lower levels of fully glaciated cloud layers compared to growing clouds. Comparing polluted and moderate aerosol conditions revealed a shift of the lower boundary of the mixed phase layer from 5.6 ± 0.2 km (269 K) [moderate] to 6.2 ± 0.3 km (267 K) [polluted], and of the upper boundary from 6.8 ± 0.2 km (263 K) [moderate] to 7.4 ± 0.4 km (259 K) [polluted], as would be expected from theory.

Citation: Jäkel, E., Wendisch, M., Krisna, T. C., Ewald, F., Kölling, T., Jurkat, T., Voigt, C., Cecchini, M. A., Machado, L. A. T., Afchine, A., Costa, A., Krämer, M., Andreae, M. O., Pöschl, U., Rosenfeld, D., and Yuan, T.: Vertical distribution of the phase state of particles in tropical deep-convective clouds as derived from cloud-side reflected solar radiation measurements, Atmos. Chem. Phys. Discuss.,, in review, 2017.
Evelyn Jäkel et al.
Evelyn Jäkel et al.


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