TY - JOUR

T1 - Development and application of a Lagrangian model to determine the origins of ozone episodes in the UK

AU - Strong, Jonathan

AU - Whyatt, Duncan

AU - Hewitt, C. N.

AU - Derwent, R. G.

PY - 2010/2

Y1 - 2010/2

N2 - This paper describes the further development and application of the Edinburgh-Lancaster Model for Ozone (ELMO). We replace straight-line back-trajectories with trajectories and associated meteorology supplied by the US National Oceanic and Atmospheric Administration Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) service to allow more realistic modelling of specific UK ozone episodes. We call this ELMO-2. Model performance is rigorously tested against observed ozone concentrations for two episodes recorded across 14 rural UK monitoring stations during the spring and summer of 1995. For both episodes, the afternoon concentrations (usually coinciding with the daily maxima) are captured well by the model and the diurnal ozone cycle is reproduced, although the amplitude in concentrations is generally smaller than the observed. The summer episode is investigated further through indicator species analysis and source attribution, and found to be mainly VOC-limited. European emissions account for the majority of ozone production. We demonstrate how improved modelling leads to better understanding of regional and local ozone production across the UK under episodic conditions. (C) 2009 Elsevier Ltd. All rights reserved.

AB - This paper describes the further development and application of the Edinburgh-Lancaster Model for Ozone (ELMO). We replace straight-line back-trajectories with trajectories and associated meteorology supplied by the US National Oceanic and Atmospheric Administration Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) service to allow more realistic modelling of specific UK ozone episodes. We call this ELMO-2. Model performance is rigorously tested against observed ozone concentrations for two episodes recorded across 14 rural UK monitoring stations during the spring and summer of 1995. For both episodes, the afternoon concentrations (usually coinciding with the daily maxima) are captured well by the model and the diurnal ozone cycle is reproduced, although the amplitude in concentrations is generally smaller than the observed. The summer episode is investigated further through indicator species analysis and source attribution, and found to be mainly VOC-limited. European emissions account for the majority of ozone production. We demonstrate how improved modelling leads to better understanding of regional and local ozone production across the UK under episodic conditions. (C) 2009 Elsevier Ltd. All rights reserved.

KW - ELMO

KW - HYSPLIT

KW - Source attribution

KW - Episode sensitivity

KW - ATMOSPHERIC CHEMISTRY

KW - DRY DEPOSITION

KW - SURFACE OZONE

KW - QUALITY

KW - EUROPE

KW - HYDROCARBONS

KW - SUMMER

KW - SCALE

KW - TRAJECTORIES

KW - STRATEGIES

U2 - 10.1016/j.atmosenv.2009.11.019

DO - 10.1016/j.atmosenv.2009.11.019

M3 - Journal article

VL - 44

SP - 631

EP - 641

JO - Atmospheric Environment

JF - Atmospheric Environment

SN - 1352-2310

IS - 5

ER -