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<p>Arctic deltas are highly dynamic environments at the land-ocean interface that have acted as long-term sinks of sediment, carbon (C), and nitrogen (N). Climate impacts Arctic deltas and their upstream catchments through sea-level rise, altered river discharge, increased sediment fluxes, intensified biogeochemical cycling, and permafrost thaw. As a result, soil C and N in Arctic delta deposits are becoming more bioavailable. Here, we present a C and N inventory for Arctic delta compiled from over 1600 soil samples spanning 17 river deltas. We estimate that Arctic delta deposits store 57.5 ( + 9.2/−8.2) Pg C and 3.8 ( + 0.8/−0.7) Pg N across a combined area of nearly 100,000 km², representing large and potentially vulnerable biogeochemical pools. Our findings underscore the potentially pivotal role of Arctic deltas in the pan-Arctic carbon cycle and highlight their importance as dynamic zones of both C and N storage and release in a rapidly changing Arctic.</p>

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Large stocks of permafrost soil organic carbon and nitrogen in Arctic river deltas

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月29日

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  • Matthias Fuchs,
  • Torsten Sachs,
  • Loeka L. Jongejans,
  • Jens Strauss,
  • Gustaf Hugelius,
  • Gerald V. Frost,
  • Benjamin M. Jones,
  • Steven V. Kokelj,
  • Lars Kutzbach,
  • Ingmar Nitze,
  • Pier Paul Overduin,
  • Juri Palmtag,
  • Chien-Lu Ping,
  • Oleg S. Pokrovsky,
  • Elizaveta Rivkina,
  • Alexandra Runge,
  • Lutz Schirrmeister,
  • Georg Schwamborn,
  • Matthias B. Siewert,
  • Claire Treat,
  • Alexandra Veremeeva,
  • Sebastian Zubrzycki,
  • Guido Grosse

摘要

Arctic deltas are highly dynamic environments at the land-ocean interface that have acted as long-term sinks of sediment, carbon (C), and nitrogen (N). Climate impacts Arctic deltas and their upstream catchments through sea-level rise, altered river discharge, increased sediment fluxes, intensified biogeochemical cycling, and permafrost thaw. As a result, soil C and N in Arctic delta deposits are becoming more bioavailable. Here, we present a C and N inventory for Arctic delta compiled from over 1600 soil samples spanning 17 river deltas. We estimate that Arctic delta deposits store 57.5 ( + 9.2/−8.2) Pg C and 3.8 ( + 0.8/−0.7) Pg N across a combined area of nearly 100,000 km², representing large and potentially vulnerable biogeochemical pools. Our findings underscore the potentially pivotal role of Arctic deltas in the pan-Arctic carbon cycle and highlight their importance as dynamic zones of both C and N storage and release in a rapidly changing Arctic.