edu.ucar.opensky::articles:42513 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-24T18:06:47.883119 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.net/ark:/85065/d7vm4hkf https://doi.org/10.17632/txf334p6nx.1 https Related Dataset #1 Seaice_Arctic_Halogens_Reduce_NHmidlat_Ozone https://doi.org/10.7289/V57P8WBF https Related Dataset #2 NOAA Global Monitoring Division Tropospheric Ozone Program https://doi.org/10.5065/D6RX99HX https Related Service #1 Cheyenne: SGI ICE XA Cluster Arctic halogens reduce ozone in the northern mid-latitudes 2024-09-01T00:00:00Z publication https://n2t.net/ark:/85065/d7vm4hkf https://doi.org/10.1073/pnas.2401975121 Fernandez, R. P. author Berná, L. author Tomazzeli, O. G. author Mahajan, A. S. author Li, Q. author Kinnison, Douglas E. author Wang, S. author J. F. Lamarque author Tilmes, Simone author Skov, H. author Cuevas, C. A. author Saiz-Lopez, A. author UCAR/NCAR - Library publisher While the dominant role of halogens in Arctic ozone loss during spring has been widely studied in the last decades, the impact of sea-ice halogens on surface ozone abundance over the northern hemisphere (NH) mid-latitudes remains unquantified. Here, we use a state-of-the-art global chemistry-climate model including polar halogens (Cl, Br, and I), which reproduces Arctic ozone seasonality, to show that Arctic sea-ice halogens reduce surface ozone in the NH mid-latitudes (47°N to 60°N) by ~11% during spring. This background ozone reduction follows the southward export of ozone-poor and halogen-rich air masses from the Arctic through polar front intrusions toward lower latitudes, reducing the springtime tropospheric ozone column within the NH mid-latitudes by ~4%. Our results also show that the present-day influence of Arctic halogens on surface ozone destruction is comparatively smaller than in preindustrial times driven by changes in the chemical interplay between anthropogenic pollution and natural halogens. We conclude that the impact of Arctic sea-ice halogens on NH mid-latitude ozone abundance should be incorporated into global models to improve the representation of ozone seasonality. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication <style type="text/css"></style><span style="font-family:Arial;font-size:10pt;font-style:normal;" data-sheets-root="1">Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.</span> None eng geoscientificInformation