This is the annual report of the GHRSST community, covering the activities of year 2021. Copyright 2022© European Union This report has been edited by the GHRSST Project Office. Funded by the European Union's Copernicus programme. This copyright notice applies only to the overall collection of papers: authors retain their individual rights and should be contacted directly for permission to use their material separately. Editorial correspondence and requests for permission to publish, reproduce

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... r translate this publication in part or in whole should be addressed to the GHRSST Project Office. The papers included comprise the proceedings of the meeting and reflect the authors' opinions and are published as presented. Their inclusion in this publication does not necessarily constitute endorsement by GHRSST or the co–organisers. Cite as: GHRSST Annual Report 2021, DOI: 10.5281/zenodo.5824540