Tropospheric ozone budget: nighttime observation during the RONOCO campaign on-board the BAe-146 aircraft

RONOCO (ROle of Nighttime chemistry in controlling the Oxidising Capacity of the atmosphere) was an airborne campaign aimed to study the role of nighttime chemistry on the oxidation capacity of the atmosphere. The campaign was ran from July to September 2011 and in January 2012 in the UK. During the 27 research flights the main constituents of the atmosphere were observed (O3, NO, NO2, CO, CO2, HNO3, nitrates, several VOCs) and also chemical and physical proprieties of aerosols, ranging from few meters above the ground and the sea to up to 4000 m. We describe the instrumental setup on the BAe-146 aircraft of a new Laser Induced Fluorescence system developed by CETEMPS (University of L’Aquila) to observe NO2, peroxy nitrates and alkyl nitrates. We will analyses the processes and parameters that control the ozone budget during the nighttime: in details we will show the role of alkyl nitrates and the role of NO3 and N2O5 on the understanding of the nighttime ozone loss in the lower troposphere.