Retrievals of Ozone Profiles over Greenland and Their Relationship to Sudden Stratospheric Warmings

Recent work has shown that the profile of ozone over Greenland is sensitive to the phase of the quasi-biennial oscillation (QBO). This is likely because of a significant dynamical teleconnection between the tropics and the Arctic that occurs over Greenland. We use eight years of downwelling infrared radiance measurements from Summit Station, Greenland obtained during the Integrated Characterization of Energy, Clouds, Atmospheric state, and Precipitation over Summit (ICECAPS) field campaign to retrieve ozone profiles from 2010 to 2018. The radiance spectra (3 - 20 micrometers) were measured by the Polar Atmospheric Emitted Radiance Interferometer (P-AERI) at moderate spectral resolution (0.5 cm^-1). The SFIT4 spectral data analysis model is used to retrieve ozone profiles during periods of clear-sky conditions. Profiles from ozonesondes launched by NOAA at Summit are used as a priori information. Remotely sensed data measured by OMI and MLS and the reanalysis model MERRA-2 are used for comparison. The ozone profiles during sudden stratospheric warming (SSW) events are investigated. The retrievals provide higher-time resolution than the ozonesondes and, therefore, provide valuable insight into the short-term variations of ozone over Greenland that are associated with SSW events. Major SSW events in the Arctic in January 2013 and February 2018, as well as minor SSW and final warming events, are examined. We also present a new product that fuses P-AERI retrievals of the lower atmosphere with retrievals from satellite data of the upper stratosphere.