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Review of tools for modelling tropospheric ozone formation for assessing impacts on human health and ecosystems. - AQ0706

Description
Ozone can effect human health, lead to reduction in crop yields and can damage natural ecosystems and is the subject of a number of national and international policy controls. Ozone is not emitted directly from any man made source. Tropospheric ozone originates mainly from production within the troposphere by photochemical oxidation of CO and hydrocarbons catalysed by HOx and the oxides of nitrogen (NOx). There is an additional source from transfer from the stratosphere. These sources are balanced by in-situ photochemical destruction of ozone and by dry deposition at the Earth’s surface. The hydrocarbon’s that act as the fuel for the production of ozone have both man-made and natural biogenic sources.

It is recognised for some time that photochemical formation of O3 can take place over several hours or days from emissions of precursers that have arisen many hundreds or even thousands of kilometers away. So while local or regional emissions and environmental conditions are responsible for most of the O3 generation, there is well-documented evidence for the intercontinental transport of O3 and its precursors.

Owing to the relatively complex chemical and meteorological interactions that lead to the formation of ozone i.e. the influence of local, regional and global transport, a multiple metric system is required to assess different impacts on human health and on ecosystems in the UK. In order to deliver the requisite metrics there are a number of different technical inputs based on measurements and models required by Defra to fully meet and support development of policies related to ozone in the context of air quality.

The aim of this work is to collate, evaluate and summarise information on tools for modelling ozone (O3) formation and assessing impacts on human health and ecosystems within the DEFRA policy context. The project will review and evaluate current tropospheric O3 models utilised or potentially suitable to supporting Defra’s policy needs, make recommendations on future R & D in the area of tropospheric ozone modelling and deliver workshop to engage users on outcome of project.

To meet the aims of the project a number of specific task will be undertaken

TASK 1 - The first task is to identify the candidate models followed by an information gathering phase that will collate and summarise the information such as the description of model and its uses to date.

TASK 2 - The second task will be to gather quantitative measures of the policy metrics to evaluate the candidate models against

TASK 3 - The third phase (task) of the work will take the candidate models and evaluate them against a series of criteria developed within the work program.

The outputs of these tasks will be used to review the "fitness for purpose" of the current delivery of evidence-based policy using tropospheric ozone models and make recommendations for future R&D in the context of the models currently available or likely to be available.
Objective
The overall objective of this work is to collate, evaluate and summarise information on tools for modelling ozone (O3) formation and assessing impacts on human health and ecosystems within the DEFRA policy context. In order to achieve this overall objective there are a series of sub-objectives
1. Review and evaluate current tropospheric O3 models utilised or potentially suitable to supporting Defra’s policy needs
2. Deliver workshop to engage users on outcome of project
3. Make recommendations on future R & D in the area of tropospheric ozone modelling for evidence-based policy delivery
4. Deliver final report by 1st September 2007

Project Documents
• Final Report : Review of tools for modelling tropospheric ozone   (3201k)
Time-Scale and Cost
From: 2007

To: 2007

Cost: £32,805
Contractor / Funded Organisations
University - Leicester
Keywords
Air Pollution              
Environmental Protection              
Modelling              
Pollution              
Fields of Study
Air Quality