Arctic halogens reduce ozone in the northern mid-latitudes

• 成果类型: Article
• 署名作者: Fernandez, Rafael P.; Berna, Lucas; Tomazzeli, Orlando G.; Mahajan, Anoop S.; Li, Qinyi; Kinnison, Douglas E.; Wang, Siyuan; Lamarque, Jean-Francois; Tilmes, Simone; Skov, Henrik; Cuevas, Carlos A.; Saiz-Lopez, Alfonso
• 署名单位: Consejo Superior de Investigaciones Cientificas (CSIC); CSIC - Instituto de Quimica Fisica Blas Cabrera (IQF-CSIC); Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET); University Nacional Cuyo Mendoza; Ministry of Earth Sciences (MoES) - India; Indian Institute of Tropical Meteorology (IITM); Centre for Climate Change Research - India; Shandong University; National Center Atmospheric Research (NCAR) - USA; University of Colorado System; University of Colorado Boulder; National Oceanic Atmospheric Admin (NOAA) - USA; Aarhus University
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-15352
• DOI: 10.1073/pnas.2401975121
• 发表日期: 2024-09-24
• 关键词: sea-salt aerosol; tropospheric ozone; surface ozone; depletion events; atmospheric chemistry; iodine chemistry; air-pollution; bromine; MODEL; snow

摘要

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 degrees N to 60 degrees N) by similar to 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 similar to 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.