Variations in the vertical profile of ozone at four high-latitude Arctic sites from 2005 to 2017

• DOI: 10.5194/acp-19-9733-2019
• Publication Date: 2019-08-02T10:50:19Z
• Authors: Shima Bahramvash ...; Von P. Walden; Irina Petropavlov...; David Tarasick; Rigel Kivi; Samuel Oltmans; Bryan Johnson; Patrick Cullis; Chance W. Sterling; Laura Thölix; Quentin Errera
• Keywords: Microwave Limb Sounder

Abstract. Understanding variations in atmospheric ozone the Arctic is difficult because there are only a few long-term records of vertical profiles this region. We present 12 years from February 2005 to 2017 at four sites: Summit Station, Greenland; Ny-Ålesund, Svalbard, Norway; and Alert Eureka, Nunavut, Canada. These created by combining ozonesonde measurements with profile retrievals using data Microwave Limb Sounder (MLS). This combination creates high-quality dataset low uncertainty values relying on situ maximum altitude ozonesondes (∼30 km) satellite upper atmosphere (up 60 km). For each station, total column (TCO) partial (PCO) layers (troposphere stratosphere) analyzed. Overall, seasonal cycles similar these sites. However, TCO over Ny-Ålesund starts decline 2 months later than other In summer, PCO stratosphere Station slightly higher sites exhibits standard deviation. The decrease middle during fall also lower Station. value lower- middle-stratospheric reached earlier year Eureka. Trend analysis 12-year period shows significant trends most summer fall. To understand deseasonalized variations, we identify important dynamical drivers level. chosen based mutual selected proxies stepwise multiple regression (SMR) various parameters data. final model able explain more 80 % 70 almost all layers. provides greatest explanatory stratosphere. time series tropopause pressure (TP) equivalent latitude (EQL) 370 K troposphere, quasi-biennial oscillation (QBO) troposphere stratosphere, 550 eddy heat flux (EHF) volume polar stratospheric clouds throughout