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Arctic soils contain large amounts of organic matter which, globally, exceedthe amount of carbon stored in vegetation biomass and in the atmosphere.Recent studies emphasise the potential sensitivity for this soil organicmatter (SOM) to be mineralised when faced with increasing ambienttemperatures. In order to better refine the predictions about the responseof SOM to climate warming, there is a need to increase the spatial coverageof empirical data on SOM quantity and quality in the Arctic area. This studyprovides, for the first time, a characterisation of SOM from the GydanPeninsula in the Yamal Region, Western Siberia, Russia. On the one hand,soil humic acids and their humification state were characterised bymeasuring the elemental composition and diversity of functional groups usingsolid-state <sup>13</sup>C-nuclear magnetic resonance (NMR) spectroscopy. Also,the total mineralisable carbon was measured. Our results indicate that thereis a predominance of aliphatic carbon structures, with a minimal variationof their functional-group composition both regionally and within soildepth. This vertical homogeneity and low level of aromaticity reflects theaccumulation in soil of lowly decomposed organic matter due to coldtemperatures. Mineralisation rates were found to be independent of SOMquality, and to be mainly explained solely by the total carbon content.Overall, our results provide further evidence on the sensitivity that thesoils of Western Siberia may have to increasing ambient temperatures andhighlight the important role that this region can play in the global carbonbalance under the effects of climate warming

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Stability and biodegradability of organic matter from Arctic soils of Western Siberia: insights from &amp;lt;sup&amp;gt;13&amp;lt;/sup&amp;gt;C-NMR spectroscopy and elemental analysis