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Volume 17, issue 14 | Copyright

Special issue: The ACRIDICON-CHUVA campaign to study deep convective clouds...

Atmos. Chem. Phys., 17, 9049-9066, 2017
https://doi.org/10.5194/acp-17-9049-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 27 Jul 2017

Research article | 27 Jul 2017

Vertical distribution of the particle phase 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 Evelyn Jäkel et al.
  • 1Leipzig Institute for Meteorology (LIM), University of Leipzig, Leipzig, Germany
  • 2Meteorological Institute, Ludwig-Maximilians-University Munich, 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
  • 5Institute for Energy and Climate Research – Stratosphere (IEK-7), Forschungszentrum Jülich, Jülich, Germany
  • 6Biogeochemistry Department, Max 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 cloud particle phase in tropical deep convective clouds (DCCs) were investigated using airborne solar spectral radiation data collected by the German High Altitude and Long Range Research Aircraft (HALO) during the ACRIDICON-CHUVA campaign, which was conducted over the Brazilian rainforest in September 2014. A phase discrimination retrieval based on imaging spectroradiometer measurements of DCC side spectral reflectivity was applied to clouds formed in 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 900m for one single cloud scene. This variability is attributed to the different stages of cloud development in a 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±0.2km (269K; moderate) to 6.2±0.3km (267K; polluted), and of the upper boundary from 6.8±0.2km (263K; moderate) to 7.4±0.4km (259K; polluted), as would be expected from theory.

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Vertical profiles of the cloud particle phase state in tropical deep convective clouds (DCCs) were investigated using airborne imaging spectrometer measurements during the ACRIDICON-CHUVA campaign, which was conducted over the Brazilian rainforest in September 2014. A phase discrimination retrieval was applied to observations of clouds formed in different aerosol conditions. The profiles were compared to in situ and satellite measurements.
Vertical profiles of the cloud particle phase state in tropical deep convective clouds (DCCs)...
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