AUTHOR=Murphy Melissa J. , Hendry Katharine , Opfergelt Sophie TITLE=Editorial: Novel Isotope Systems and Biogeochemical Cycling During Cryospheric Weathering in Polar Environments JOURNAL=Frontiers in Earth Science VOLUME=9 YEAR=2021 URL=https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2021.660333 DOI=10.3389/feart.2021.660333 ISSN=2296-6463