Detrainment Dominates CCN Concentrations Around Non-Precipitating Convective Clouds Over the Amazon

Autor(en)

Ramon C. Braga, Daniel Rosenfeld, Meinrat O. Andreae, Christopher Pöhlker, Ulrich Pöschl, Christiane Voigt, Bernadett Weinzierl, Manfred Wendisch, Mira L. Pöhlker, Daniel Harrison

Abstrakt

We investigated the relationship between the number concentration of cloud droplets (Nd) in ice-free convective clouds and of particles large enough to act as cloud condensation nuclei (CCN) measured at the lateral boundaries of cloud elements. The data were collected during the ACRIDICON-CHUVA aircraft campaign over the Amazon Basin. The results indicate that the CCN particles at the lateral cloud boundaries are dominated by detrainment from the cloud. The CCN concentrations detrained from non-precipitating convective clouds are smaller compared to below cloud bases. The detrained CCN particles from precipitating cloud volumes have relatively larger sizes, but lower concentrations. Our findings indicate that CCN particles ingested from below cloud bases are activated into cloud droplets, which evaporate at the lateral boundaries and above cloud base and release the CCN again to ambient cloud-free air, after some cloud processing. These results support the hypothesis that the CCN around the cloud are cloud-processed.

Organisation(en)

Aerosolphysik und Umweltphysik

Externe Organisation(en)

Southern Cross University, Max-Planck-Institut für Chemie (Otto-Hahn-Institut), Hebrew University Jerusalem, University of California, San Diego, King Saud University, Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Universität Leipzig, Leibniz-Institut für Troposphärenforschung

Journal

Geophysical Research Letters

Band

49

Anzahl der Seiten

11

ISSN

0094-8276

DOI

https://doi.org/10.1029/2022GL100411

Publikationsdatum

10-2022

Peer-reviewed

Ja

ÖFOS 2012

103039 Aerosolphysik, 105208 Atmosphärenchemie, 105206 Meteorologie

ASJC Scopus Sachgebiete

Geophysics, Allgemeine Erdkunde und Planetologie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/659db065-c8f4-43e6-ac12-293e6eaf772e