AUTHOR=Masina Simona , Counillon François , Gregoire Marilaure , Storto Andrea , Tsujino Hiroyuki TITLE=Editorial: Past Reconstruction of the Physical and Biogeochemical Ocean State JOURNAL=Frontiers in Earth Science VOLUME=10 YEAR=2022 URL=https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2022.890370 DOI=10.3389/feart.2022.890370 ISSN=2296-6463