Columns:
Study
	In which study the given horizon is measured
Latitude_DD
	Latitude coordinate in decimal degrees
Longitude_DD
	Longitude coordinate in decimal degrees
Name
	Name of the location as described in the study
Core_name
	Core name, either from article or own name
Permafrost_extent
	The permafrost zone in which the horizon has been taken
Study_description
	Description of the given horizon as described in the study
Soil_type
	Soil type as described in the study
Organic_C_content_percent
	Content of organic carbon for the given horizon
CN
	Carbon (N) to nitrogen (N) ratio for the given horizon
Ice_content_vol%
	Content of ice by vol% for the given horizon
Thaw_Depth_m
	Thawing depth for the given core. If the horizons lower depth is larger, then it is permafrost, if not, it is the active layer
Depth_lower_m
	The lower limit of the given horizon, in relation to the surface
Layer_Thickness_m
	The thickness of the given horizon
DIN_mg/l
	The contents of DIN as reported in the study (or calculated from study values), for the given horizon
DIN_mg/l_Normalized
	The sum of the normalised NH4 contents and the NO3 contents, for the given horizon
NH4_mg/l
	The contents of NH4 as reported in the study, for the given horizon
NH4_mg/l_Normalized
	The normalised contents of NH4, for the given horizon
NO3_mg/l
	The contents of NO3as reported in the study 
Extraction_method
	The extraction method as described in the study

Studies:
Beerman et al., 2017
	Beermann, F., Langer, M., Wetterich, S., Strauss, J., Boike, J., Fiencke, C., Schirrmeister, L., Pfeiffer, E. M., & Kutzbach, L. (2017). Permafrost Thaw and Liberation of Inorganic Nitrogen in Eastern Siberia. Permafrost and Periglacial Processes, 28(4), 605–618. https://doi.org/10.1002/ppp.1958

Elberling et al., 2010
	Elberling, B., Christiansen, H. H., & Hansen, B. U. (2010). High nitrous oxide production from thawing permafrost. Nature Geoscience, 3(5), 332–335. https://doi.org/10.1038/ngeo803

Elberling, 2021,a
	Unpublished dataset

Elberling, 2021,b
	Unpublished dataset

Elberling, 2021,c
	Unpublished dataset

Elberling, 2021, d
	Unpublished dataset

Fouche et al., 2020
	Fouché, J., Christiansen, C. T., Lafrenière, M. J., Grogan, P., & Lamoureux, S. F. (2020). Canadian permafrost stores large pools of ammonium and optically distinct dissolved organic matter. Nature Communications, 11(1). https://doi.org/10.1038/s41467-020-18331-w

Kashi et al., 2022
	Kashi, N. N., Hobbie, E. A., Varner, R. K., Wymore, A. S., Ernakovich, J. G., & Giesler, R. (2022). Nutrients Alter Methane Production and Oxidation in a Thawing Permafrost Mire Increased nutrient availability is localized in the thaw front Permafrost leachate decreased CH4 production and oxidation in incubations In incubations, phosphorus enhanced CH4 oxi-dation in fen peat. Ecosystems. https://doi.org/10.1007/s10021-022-0075

Keuper et al., 2012
	Keuper, F., van Bodegom, P. M., Dorrepaal, E., Weedon, J. T., van Hal, J., van Logtestijn, R. S. P., & Aerts, R. (2012). A frozen feast: Thawing permafrost increases plant-available nitrogen in subarctic peatlands. Global Change Biology, 18(6), 1998–2007. https://doi.org/10.1111/j.1365-2486.2012.02663.x

Voigt et al., 2017
	Voigt, C., Marushchak, M. E., Lamprecht, R. E., Jackowicz-Korczyński, M., Lindgren, A., Mastepanov, M., Granlund, L., Christensen, T. R., Tahvanainen, T., Martikainen, P. J., & Biasi, C. (2017). Increased nitrous oxide emissions from Arctic peatlands after permafrost thaw. Proceedings of the National Academy of Sciences of the United States of America, 114(24), 6238–6243. https://doi.org/10.1073/pnas.1702902114

Wickland et al., 2018
	Wickland, K. P., Waldrop, M. P., Aiken, G. R., Koch, J. C., Jorgenson, M. T., & Striegl, R. G. (2018). Dissolved organic carbon and nitrogen release from boreal Holocene permafrost and seasonally frozen soils of Alaska. Environmental Research Letters, 13(6), 065011. https://doi.org/10.1088/1748-9326/AAC4AD