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. 2019 Aug 15;10:3567. doi: 10.1038/s41467-019-11394-4

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — Carbon inventories for present day and former ice sheets. Data presented includes minimum, mid-range and maximum estimates. Antarctic Subglacial POC (AIS SG POC), minimum estimates are calculated assuming a sediment depth of 1 km, sedimentary basin areas of 1 × 10⁶ km² for WAIS and 2.5 × 10⁶ km² for EAIS, a rock density of 2650 kg m^-3, a porosity of 0.3 and a POC of 0.1%¹⁶⁹, maximum estimates are derived from ref. ¹⁶⁹. and mid-range values as the average between the two, Greenland Ice Sheet Subglacial POC (GrIS SG POC, minimum estimates calculated assuming a POC of c. 0.2%¹⁷⁰, sediment thicknesses of 0.1 m¹⁷¹ and a porosity of 0.4¹⁷², maximum estimates assuming a POC of 0.44%³⁶, sediment thicknesses of 2 m¹⁷¹ and a porosity of 0.3¹⁷² and mid-range values as the average between the two), Laurentide + Fennoscandian Ice Sheet Subglacial POC (LIS + FIS SG POC, minimum, maximum and mid-range estimates from ref. ¹⁸), Antarctic Ice Sheet englacial POC + DOC (AIS ice OC, mid-range, minimum and maximum values from ref. ⁹, where the min/max values only include DOC due to lack of data), Greenland Ice Sheet ice-bound POC + DOC (GrIS ice OC, mid-range, minimum and maximum values from ref. ⁹, where the min/max values only include DOC due to lack of data) and Northern hemisphere permafrost (N permafrost POC)⁹⁷