DOI: 10.1002/2013JD020431
论文题名: Quantifying the transport of subcloud layer reactants by shallow cumulus clouds over the Amazon
作者: Ouwersloot H.G. ; De Arellano J.V.-G. ; H. Van Stratum B.J. ; Krol M.C. ; Lelieveld J.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 23 起始页码: 13041
结束页码: 13059
语种: 英语
英文关键词: chemical reactants
; large-eddy simulations
; parametrizations
; shallow convection
; transport by clouds
Scopus关键词: Atmospheric chemistry
; Chemical analysis
; Clouds
; Computer simulation
; Large eddy simulation
; Nitrogen oxides
; Boundary layer dynamics
; Chemical reactants
; Global chemistry transport model
; Heterogeneous surface
; Parametrizations
; Shallow convection
; Shallow cumulus clouds
; Small scale variability
; Atmospheric movements
; atmospheric chemistry
; atmospheric convection
; atmospheric transport
; cloud cover
; cumulus
; isoprene
; large eddy simulation
; parameterization
; rainforest
; surface flux
; temporal evolution
; vertical movement
; Amazon River
英文摘要: 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 mass-flux-induced 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 O3 , NO, and NO2 . The latter is caused by the local partitioning of reactants, influenced by UV radiation extinction by clouds and small-scale variability of ambient atmospheric compounds. By considering the longer-lived 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. Key Points Transport by shallow convection can significantly affect atmospheric reactants This transport of atmospheric compounds by active clouds can be parametrized Heterogeneous surface conditions affect clouds and the needed parametrizations ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63116
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Meteorology and Air Quality, Wageningen University and Research Centre, Wageningen, Netherlands; Max Planck Institute for Chemistry, Mainz, Germany; Max Planck Institute for Meteorology, International Max Planck Research School on Earth System Modelling, Hamburg, Germany
Recommended Citation:
Ouwersloot H.G.,De Arellano J.V.-G.,H. Van Stratum B.J.,et al. Quantifying the transport of subcloud layer reactants by shallow cumulus clouds over the Amazon[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(23)