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On the attribution of contributions of atmospheric trace gases to emissions in atmospheric model applications

Grewe, Volker and Eleni, Tsati and Hoor, Peter (2010) On the attribution of contributions of atmospheric trace gases to emissions in atmospheric model applications. Geoscientific Model Development, 3, pp. 487-499. Copernicus. DOI: 10.5194/gmd-3-487-2010.

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Official URL: http://www.geosci-model-dev.net/3/487/2010/

Abstract

We present an improved tagging method, which describes the combined effect of emissions of various species from individual emission categories, e.g. the impact of both, nitrogen oxides and non-methane hydrocarbon emissions on ozone. This method is applied to two simplified chemistry schemes, which represent the main characteristics of atmospheric ozone chemistry. Analytical solutions are presented for this tagging approach. In the past, besides tagging approaches, sensitivity methods were used, which estimate the contributions from individual sources based on differences in two simulations, a base case and a simulation with a perturbation in the respective emission category. We apply both methods to our simplified chemical systems and demonstrate that potentially large errors (factor of 2) occur with the sensitivity method, which depend on the degree of linearity of the chemical system. This error depends on two factors, the ability to linearise the chemical system around a base case, and second the completeness of the contributions, which means that all contributions should principally add up to 100%. For some chemical regimes the first error can be minimised by employing only small perturbations of the respective emission, e.g. 5%. The second factor depends on the chemical regime and cannot be minimized by a specific experimental set-up. It is inherent to the sensitivity method. Since a complete tagging algorithm for global chemistry models is difficult to achieve, we present two error metrics, which can be applied for sensitivity methods in order to estimate the potential error of this approach for a specific application.

Document Type:Article
Title:On the attribution of contributions of atmospheric trace gases to emissions in atmospheric model applications
Authors:
AuthorsInstitution or Email of Authors
Grewe, Volkervolker.grewe@dlr.de
Eleni, TsatiDLR
Hoor, PeterUniv. Mainz, Mainz
Date:12 October 2010
Journal or Publication Title:Geoscientific Model Development
Refereed publication:Yes
In Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:3
DOI:10.5194/gmd-3-487-2010
Page Range:pp. 487-499
Publisher:Copernicus
Status:Published
Keywords:Tagging, Chemistry, ozone, NMHC, VOC, NOy emissions
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Transport System
DLR - Research area:Transport
DLR - Program:V VS - Verkehrssystem
DLR - Research theme (Project):V - Umweltwirkungen des Verkehrs (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Dynamics
Deposited By: Dr.rer.nat. Volker Grewe
Deposited On:13 Oct 2010 16:21
Last Modified:07 Feb 2013 20:17

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