Increasing springtime surface ozone at the NOAA Barrow Atmospheric Observatory: influences of changing circulation patterns and changing sea ice extent. ...

• Main Authors: Effertz, Peter, Petropavlovskikh, Irina
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Arctic; Ice cap; Sea ice
• Online Access: https://dx.doi.org/10.57757/iugg23-2642; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019242

<!--!introduction!--> According to the NOAA Arctic Report Card 2021 (https://arctic.noaa.gov/Report-Card/Report-Card-2021) the ice cap over the Arctic is shrinking. Ozone depleting events (ODEs) are here defined as the fraction of hours in a given month that fall below 15ppb, a level that is highly suggestive of the halogen chemistry that occurs in the arctic springtime and deplete the ozone near the surface. ODEs have been measured during the springtime at NOAA’s NOAA GML’s Barrow Observatory since its founding in the early 1970s. Because the ODEs at the Barrow site are a major driver of the climatology of ozone in the springtime, changes in ODEs frequency or severity will affect the overall trend. The overall trend in the frequency of ODE has been increasing in the months of February and March and decreasing during April and May. However, recently (since 2014), the ODEs have been decreasing and therefore the monthly mean ozone has been increasing. In March, where the source region of the air masses ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...