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          Institute: MPI für Chemie     Collection: Publikationen MPI für Chemie     Display Documents

ID: 675684.0, MPI für Chemie / Publikationen MPI für Chemie
Quantifying the transport of subcloud layer reactants by shallow cumulus clouds over the Amazon
Authors:Ouwersloot, H. G.; Vilà-Guerau de Arellano, J.; van Stratum, B. J. H.; Krol, M. C.; Lelieveld, J.
Date of Publication (YYYY-MM-DD):2013-12-16
Title of Journal:Journal of Geophysical Research-Atmospheres
Issue / Number:23
Start Page:13041
End Page:13059
Review Status:Internal review
Audience:Experts Only
Abstract / Description:We investigate the vertical transport of atmospheric chemical reactants from the subcloud layer to the cumulus cloud layer driven by shallow convection over the Amazon during the dry season. The dynamical and chemical assumptions needed for mesoscale and global chemistry transport model parametrizations are systematically analyzed using a Large Eddy Simulation model. We quantify the mass flux transport contribution to the temporal evolution of reactants. Isoprene, a key atmospheric compound over the tropical rain forest, decreases by 8.5% h(-1) on average and 15% h(-1) at maximum due to massfluxinduced removal. We apply mass flux parametrizations for the transport of chemical reactants and obtain satisfactory agreement with numerically resolved transport, except for some reactants like O-3, NO, and NO2. The latter is caused by the local partitioning of reactants, influenced by UV radiation extinction by clouds and smallscale variability of ambient atmospheric compounds. By considering the longerlived NOx (NO + NO2), the transport is well represented by the parametrization. Finally, by considering heterogeneous surface exchange conditions, it is demonstrated that the parametrizations are sensitive to boundary conditions due to changes in the boundary layer dynamics.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Chemie
Identifiers:ISI:000330266500022 [ID No:1]
ISSN:2169-897X [ID No:2]
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