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. Soils in the northern high latitudes are a key component in the global carboncycle, with potential feedback on climate. This study aims to improve theprevious soil organic carbon (SOC) and total nitrogen (TN) storage estimatesfor the Zackenberg area (NE Greenland) that were based on a land coverclassification (LCC) approach, by using geomorphological upscaling. Inaddition, novel organic carbon (OC) estimates for deeper alluvial and deltaicdeposits (down to 300  cm depth) are presented. We hypothesise that landformswill better represent the long-term slope and depositional processes thatresult in deep SOC burial in this type of mountain permafrost environments.The updated mean SOC storage for the 0–100  cm soil depth is 4.8  kg C m−2 ,which is 42  % lower than the previous estimate of 8.3  kg C m−2 based on land cover upscaling. Similarly, the mean soil TN storagein the 0–100  cm depth decreased with 44  % from 0.50  kg ( ±  0.1 CI) to0.28 ( ± 0.1 CI) kg TN m−2 . We ascribe the differences to aprevious areal overestimate of SOC- and TN-rich vegetated land cover classes.The landform-based approach more correctly constrains the depositional areasin alluvial fans and deltas with high SOC and TN storage. These are alsoareas of deep carbon storage with an additional 2.4  kg C m−2 in the100–300  cm depth interval. This research emphasises the need to considergeomorphology when assessing SOC pools in mountain permafrost landscapes.

Landform partitioning and estimates of deep storage of soil organic matter in Zackenberg, Greenland