Analysis of measurements from the last decade throughout Europe have demonstrated that ambient NOx and NO2 concentrations are not decreasing in line with the published emission factors (Carslaw et al. 2011). On-road vehicle testing in the UK has highlighted that the problem is primarily related to NOx emissions from diesel cars remaining relatively static (Carslaw & Rhys-Tyler, 2013). So are we really surprised by the recent admission by Volkswagen that their diesel cars emit much lower rates of NOx in standard laboratory conditions than in real-world scenarios?
When modelling air quality in urban areas it is critical that the most accurate emissions estimates are used. Currently for some pollutants the most accurate emissions appear to be those derived from on-road emissions testing and other techniques such as analysing roadside particulate measurements to estimate non-exhaust PM10 and PM2.5 (Harrison et al. 2012). CERC has developed the EMIT toolkit to allow users to edit the standard factors for exhaust and non-exhaust emissions in line with the most up-to-date emissions estimates. EMIT also enables the user to quantify the contributions from particular road vehicles, such as diesel cars, to emissions and concentrations, when used with ADMS-Urban. The apportionment is fully user-defined; for example emissions can be apportioned by EURO class or vehicle size.
At the upcoming ADMS-Urban & Roads User Group Meeting in Manchester, CERC will present validation results from an ADMS-Urban modelling scenario where EMIT has been used to calculate NOx and PM emissions consistent with real-world measurements; agreement between modelled and observed concentrations is very good. If you would like to know more about features of EMIT and ADMS-Urban that may improve your modelling results, please contact CERC.
CERC is pleased to announce that registration is now open for this year's ADMS User Group Meetings, which are being held at The Manchester Conference Centre on the 11th and 12th November. Please register before 31st October. Software users with valid support are entitled to one free place at the relevant User Group Meeting for a single user licence, two free places for a 2-5 user licence and two free places for research and teaching licences. For all other attendees the fee is £150 per person per event (excluding VAT).
CERC was recently commissioned to carry out an assessment of the impact of two proposed large wind turbines on the wind energy yield of an existing smaller wind turbine in the neighbourhood of the proposed site. The assessment used FLOWSTAR-Energy to model the impact of the proposed wind turbines on the local flow and turbulence including the effect of the local topography. The picture shows calculated mean wind speed and direction overlaid on an OS OpenData background map.
FLOWSTAR-Energy is an extension of the FLOWSTAR model of flow and turbulence in complex terrain and provides useful output for wind farm planning, such as free stream, gross and net energy yields. FLOWSTAR-Energy will be available to purchase from this autumn; for more information and prices, please contact CERC.
The 2015 User Group Meetings will be held in Manchester on the 11th and 12th November.
These meetings will include the usual mix of presentations by CERC staff and software users and are the ideal opportunity to hear the latest news and advice on new model features. Users with a valid support contract are entitled to one or two delegate places free of charge depending on the type of licence held. Please contact CERC if there is a topic you would like to be covered at one of the meetings or if you would be willing to give a 'user view' presentation. Registration will open online in the Autumn.