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Uncertainties in atmospheric chemistry modelling due to convection parameterisations and subsequent scavenging

Tost, Holger and Lawrence, Mark G. and Brühl, Christoph and Jöckel, Patrick and GABRIEL, Team and SCOUT-O3-DARWIN/ACTIVE, Team (2010) Uncertainties in atmospheric chemistry modelling due to convection parameterisations and subsequent scavenging. Atmospheric Chemistry and Physics, 10, pp. 1931-1951. DOI: 10.5194/acp-10-1931-2010.

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Official URL: http://www.atmos-chem-phys.net/10/1931/2010/acp-10-1931-2010.pdf

Abstract

Moist convection in global modelling contributes significantly to the transport of energy, momentum, water and trace gases and aerosols within the troposphere. Since convective clouds are on a scale too small to be resolved in a global model their effects have to be parameterised. However, the whole process of moist convection and especially its parameterisations are associated with uncertainties. In contrast to previous studies on the impact of convection on trace gases, which had commonly neglected the convective transport for some or all compounds, we investigate this issue by examining simulations with five different convection schemes. This permits an uncertainty analysis due to the process formulation, without the inconsistencies inherent in entirely neglecting deep convection or convective tracer transport for one or more tracers. Both the simulated mass fluxes and tracer distributions are analysed. Investigating the distributions of compounds with different characteristics, e.g., lifetime, chemical reactivity, solubility and source distributions, some differences can be attributed directly to the transport of these compounds, whereas others are more related to indirect effects, such as the transport of precursors, chemical reactivity in certain regions, and sink processes. The model simulation data are compared with the average regional profiles of several measurement campaigns, and in detail with two campaigns in fall and winter 2005 in Suriname and Australia, respectively. The shorter-lived a compound is, the larger the differences and consequently the uncertainty due to the convection parameterisation are, as long as it is not completely controlled by local production that is independent of convection and its impacts (e.g. water vapour changes). Whereas for long-lived compounds like CO or O3 the mean differences between the simulations are less than 25%), differences for short-lived compounds reach up to ±100% with different convection schemes. A rating of an overall "best" performing scheme is difficult, since the optimal performance depends on the region and compound.

Document Type:Article
Title:Uncertainties in atmospheric chemistry modelling due to convection parameterisations and subsequent scavenging
Authors:
AuthorsInstitution or Email of Authors
Tost, HolgerMPI for Chemistry
Lawrence, Mark G.MPI for Chemistry
Brühl, ChristophMPI for Chemistry
Jöckel, PatrickPatrick.Joeckel@dlr.de
GABRIEL, TeamUNSPECIFIED
SCOUT-O3-DARWIN/ACTIVE, TeamUNSPECIFIED
Date:February 2010
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
In Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:10
DOI:10.5194/acp-10-1931-2010
Page Range:pp. 1931-1951
Status:Published
Keywords:Atmospheric Modelling, Convection, Atmospheric Chemistry
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Dynamics
Deposited By: Patrick Jöckel
Deposited On:15 Nov 2010 18:01
Last Modified:12 Dec 2013 21:04

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