[AAS07-P05] In-situ and continuous observation of atmospheric N2O and CO concentrations at Syowa Station, Antarctica.
Keywords:Global Warming, Atmosphere, Antarctica, Syowa, N2O, CO
In this study, we developed a new continuous observation system for atmospheric N2O and CO concentrations based on an OA-ICOS (Off-Axis Integrated Cavity Output Spectroscopy) laser spectrometer (Los Gatos Research, model N2O/CO r23) (Fig.1). Repeatability for the analysis of N2O and CO concentrations by the system is estimated to be 0.14 ppb and 0.09 ppb (one standard deviation), respectively. The system was installed at Syowa Station, Antarctica, and continuous observation started in January 2019.
Figure 2 shows the temporal variations of the N2O and CO concentrations observed by our system at Syowa Station since January, 2019. As shown in the figure, characteristic variations of N2O and CO are found in each season. In the austral summer, in-phase and out-of-phase fluctuations of N2O and CO were observed several times. These fluctuations could be caused by the transport of high N2O and CO air mass affected by outgassing from the Southern Ocean and downward transport of stratospheric air into Syowa Station. In austoral spring, high CO event was captured at Syowa Station. It had been affected by serious biomass burning in Amazon and Australia.
In this presentation, we will introduce the observation system, thus developed, and show the temporal variations in the N2O and CO concentration observed at Syowa Station in more detail.