作者: James D Lee , Carole Helfter , Ruth M Purvis , Sean D Beevers , David C Carslaw
DOI: 10.1021/ES5049072
关键词: Tower 、 Airflow 、 Eddy covariance 、 Atmospheric emissions 、 Time resolution 、 Flux (metallurgy) 、 Meteorology 、 NOx 、 Emission inventory
摘要: Direct measurements of NOx concentration and flux were made from a tall tower in central London, UK as part the Clean Air for London (ClearfLo) project. Fast time resolution (10 Hz) NO NO2 concentrations measured combined with fast vertical wind to provide top-down estimates using eddy covariance technique. Measured fluxes usually positive ranged close zero at night 2000–8000 ng m–2 s–1 during day. Peak observed morning, coincident maximum traffic flow. Measurements have been scaled compared National Atmospheric Emissions Inventory (NAEI) estimate emission measurement footprint. The are on average 80% higher than NAEI inventory all London. Observations westerly airflow (from parts where is smaller fraction source) showed better agreement inventory. observations sug...