Cloud droplet formation at the base of tropical convective clouds: closure between modeling and measurement results of ACRIDICON-CHUVA

Ramon Campos Braga; Barbara Ervens; Daniel Rosenfeld; Meinrat O. Andreae; Jan-David Forster; Daniel Futterer; Lianet Hernandez Pardo; Bruna A. Holanda; Tina Jurkat-Witschas; Ovid O. Kruger; Oliver Lauer; Luiz A. T. Machado; Christopher Poehlker; Daniel Sauer; Christiane Voigt; Adrian Walser; Manfred Wendisch; Ulrich Poeschl; Mira L. Poehlker

doi:10.5194/acp-21-17513-2021

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Cloud droplet formation at the base of tropical convective clouds: closure between modeling and measurement results of ACRIDICON-CHUVA

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Cloud droplet formation at the base of tropical convective clouds: closure between modeling and measurement results of ACRIDICON-CHUVA

Ramon Campos Braga, Barbara Ervens, Daniel Rosenfeld, Meinrat O. Andreae, Jan-David Forster, Daniel Futterer, Lianet Hernandez Pardo, Bruna A. Holanda, Tina Jurkat-Witschas, Ovid O. Kruger, …

Atmospheric chemistry and physics, Vol.21(23), pp.17513-17528

02/12/2021

DOI: https://doi.org/10.5194/acp-21-17513-2021

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Aerosol-cloud interactions contribute to the large uncertainties in current estimates of climate forcing. We investigated the effect of aerosol particles on cloud droplet formation by model calculations and aircraft measurements over the Amazon and over the western tropical Atlantic during the ACRIDICON-CHUVA campaign in September 2014. On the HALO (High Altitude Long Range Research) research aircraft, cloud droplet number concentrations (N-d) were measured near the base of clean and polluted growing convective cumuli using a cloud combination probe (CCP) and a cloud and aerosol spectrometer (CAS-DPOL). An adiabatic parcel model was used to perform cloud droplet number closure studies for flights in differently polluted air masses. Model input parameters included aerosol size distributions measured with an ultra-high sensitive aerosol spectrometer (UHSAS), in combination with a condensation particle counter (CPC). Updraft velocities (w) were measured with a boom-mounted Rosemount probe. Over the continent, the aerosol size distributions were dominated by accumulation mode particles, and good agreement between measured and modeled N-d values was obtained (deviations less than or similar to 10 %) assuming an average hygroscopicity of kappa similar to 0.1, which is consistent with Amazonian biomass burning and secondary organic aerosol. Above the ocean, fair agreement was obtained assuming an average hygroscopicity of kappa similar to 0.2 (deviations less than or similar to 16 %) and further improvement was achieved assuming different hygroscopicities for Aitken and accumulation mode particles (kappa(Ait) = 0.8, kappa(acc) = 0.2; deviations less than or similar to 10 %), which may reflect secondary marine sulfate particles. Our results indicate that Aitken mode particles and their hygroscopicity can be important for droplet formation at low pollution levels and high updraft velocities in tropical convective clouds.

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Title: Cloud droplet formation at the base of tropical convective clouds: closure between modeling and measurement results of ACRIDICON-CHUVA
Creators: Ramon Campos Braga - Max Planck Institute for Chemistry
Barbara Ervens - Sigma Clermont
Daniel Rosenfeld - The Hebrew University of Jerusalem
Meinrat O. Andreae - Max Planck Institute for Biogeochemistry
Jan-David Forster - Max Planck Institute for Chemistry
Daniel Futterer - German Aerospace Center
Lianet Hernandez Pardo - Max Planck Institute for Chemistry
Bruna A. Holanda - Max Planck Institute for Chemistry
Tina Jurkat-Witschas - German Aerospace Center
Ovid O. Kruger - Max Planck Institute for Chemistry
Oliver Lauer - Max Planck Institute for Chemistry
Luiz A. T. Machado - Max Planck Institute for Chemistry
Christopher Poehlker - Max Planck Institute for Chemistry
Daniel Sauer - German Aerospace Center
Christiane Voigt - German Aerospace Center
Adrian Walser - German Aerospace Center
Manfred Wendisch - Meteor
Ulrich Poeschl - Max Planck Institute for Chemistry
Mira L. Poehlker - Max Planck Institute for Chemistry
Publication Details: Atmospheric chemistry and physics, Vol.21(23), pp.17513-17528
Publisher: Copernicus Gesellschaft Mbh
Number of pages: 16
Grant note: German Aerospace Center (DLR); Helmholtz Association; German Aerospace Centre (DLR) Max Planck Society (MPG); Max Planck Society ANR-17-MPGA-0013 / French National Research Agency (ANR) SPP 1294 / German Science Foundation (DFG Priority Program); German Research Foundation (DFG)
Identifiers: 991013093612602368
Academic Unit: Faculty of Science and Engineering
Language: English
Resource Type: Journal article

Cloud droplet formation at the base of tropical convective clouds: closure between modeling and measurement results of ACRIDICON-CHUVA

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