Monday, 26 June 2017: 11:30 AM
Salon G-I (Marriott Portland Downtown Waterfront)
In the stratosphere, reactive nitrogen species (NOy), including nitrogen oxides (NOx = NO + NO2) are produced through the oxidation of nitrous oxide (N2O) and are closely linked with stratospheric ozone (O3) through catalytic cycle. Interannual variability of NOy and O3 are influenced by large-scale circulation related to the stratospheric quasi-biennial oscillation (QBO) in the tropics. In this study, we examine variability of nitrogen species, and their links with O3, using 10 years (2005-2014) of satellite measurements from the Optical Spectrograph and InfraRed Imaging System (OSIRIS) instrument onboard the Odin spacecraft, together with the measurements of O3 and nitric acid (HNO3) from the Aura Microwave Limb Sounder (MLS). NOx proxy (= NOx*) is constructed based on OSIRIS measurements of NO2 and photochemical box model calculations. We furthermore compare observations with simulations from the Whole Atmosphere Community Climate Model (WACCM4) global community climate model. Simulations of nitrogen species from WACCM4 enable a comprehensive analysis of the NOy budget and their variations linked to the QBO. We find good agreement between the satellite observations and the model simulations.
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