AUTHOR=Yu Lejiang , Moore Kent , Zhang Lujun TITLE=Editorial: Extreme events and their spatiotemporal variability over polar regions JOURNAL=Frontiers in Environmental Science VOLUME=10 YEAR=2022 URL=https://www.frontiersin.org/journals/environmental-science/articles/10.3389/fenvs.2022.1080575 DOI=10.3389/fenvs.2022.1080575 ISSN=2296-665X