TY - JOUR
T1 - Detrainment Dominates CCN Concentrations Around Non-Precipitating Convective Clouds Over the Amazon
AU - Braga, Ramon C.
AU - Rosenfeld, Daniel
AU - Andreae, Meinrat O.
AU - Pöhlker, Christopher
AU - Pöschl, Ulrich
AU - Voigt, Christiane
AU - Weinzierl, Bernadett
AU - Wendisch, Manfred
AU - Pöhlker, Mira L.
AU - Harrison, Daniel
N1 - Publisher Copyright:
© 2022. The Authors.
PY - 2022/10/28
Y1 - 2022/10/28
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85141702253&partnerID=8YFLogxK
U2 - 10.1029/2022GL100411
DO - 10.1029/2022GL100411
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AN - SCOPUS:85141702253
SN - 0094-8276
VL - 49
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 20
M1 - e2022GL100411
ER -