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Quantifying the contributions of individual NOx sources to the trend in ozone radiative forcing

Dahlmann, Katrin and Grewe , Volker and Ponater, Michael and Matthes, Sigrun (2011) Quantifying the contributions of individual NOx sources to the trend in ozone radiative forcing. Atmospheric Environment, 45 (17), pp. 2860-2868. Elsevier. doi: 10.1016/j.atmosenv.2011.02.071.

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Official URL: http://www.sciencedirect.com/science/journal/13522310


Source attribution of ozone radiative forcing (RF) is a prerequisite for developing adequate emission mitigation strategies with regards to climate impact. Decadal means of ozone fields from transient climate-chemistry simulations (1960-2019) are analysed and the temporal development of ozone RF resulting from individual NOx sources, e.g. road traffic, industry and air traffic, is investigated. We calculated an ozone production efficiency which is mainly dependent on the altitude of NOx emission and on the amount of background NOx with values varying over one order of magnitude. Air traffic and lightning are identified as NOx sources with a two and five times higher ozone production efficiency, respectively, than ground based sources. Second, radiative efficiency of source attributed ozone (i.e. total induced radiative flux change per column ozone) shows clear dependence on latitudinal structure of the ozone anomaly and, to a lesser extent, to its altitude. Lightning induced ozone shows the highest radiative efficiency because lightning primarily enhances ozone in low latitudes in the mid-troposphere (higher altitudes). Superimposed on these effects, a saturation effect causes a decreasing radiative efficiency with increasing background ozone concentrations. Changes in RF attributed to NOx induced ozone from 1960 to 2019 are controlled by three factors: changes in emissions, changes in ozone production efficiency and changes in the radiative efficiency. Leading effect is emission increase, but changes in ozone production efficiency increase ozone RF by a factor of three for air traffic, or reduce ozone RF by around 30% for ships. Additionally, changes in the radiative efficiency due to saturation effects change ozone RF by 2-5%.

Item URL in elib:https://elib.dlr.de/69690/
Document Type:Article
Title:Quantifying the contributions of individual NOx sources to the trend in ozone radiative forcing
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:June 2011
Journal or Publication Title:Atmospheric Environment
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 2860-2868
Keywords:Emission sectors Road transport Radiative efficiency Ozone production efficiency Air traffic Climate impact
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics, Transport
HGF - Program Themes:ATM and Operation (old), Transport System
DLR - Research area:Aeronautics, Transport
DLR - Program:L AO - Air Traffic Management and Operation, V VS - Verkehrssystem
DLR - Research theme (Project):L - Climate, Weather and Environment (old), V - Verkehrsentwicklung und Umwelt (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Dynamics
Deposited By: Dahlmann, Katrin
Deposited On:09 May 2011 10:41
Last Modified:31 Jul 2019 19:31

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