Carbon storage in permafrost and soils of the mammoth tundra-steppe biome: Role in the global carbon budget

Details Carbon storage in permafrost and soils of the mammoth tundra-steppe biome: Role in the global carbon budget Carbon storage in permafrost and soils of the mammoth tundra-steppe biome: Role in the global carbon budget

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3602502z&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 2, CiteID L02502

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5

Biogeosciences: Biogeochemical Cycles, Processes, And Modeling (0412, 0793, 1615, 4805, 4912), Biogeosciences: Permafrost, Cryosphere, And High-Latitude Processes (0702, 0716), Biogeosciences: Carbon Cycling (4806), Biogeosciences: Modeling, Biogeosciences: Paleoclimatology And Paleoceanography (3344, 4900)

Scientific paper

During the Last Glacial Maximum (LGM), atmospheric CO2 concentration was 80-100 ppmv lower than in pre-industrial times. At that time steppe-tundra was the most extensive biome on Earth. Some authors assume that C storage in that biome was very small, similar to today's deserts, and that the terrestrial carbon (C) reservoir increased at the Pleistocene-Holocene transition (PHT) by 400-1300 Gt. To estimate C storage in the entire steppe-tundra biome we used data of C storage in soils of this biome that persisted in permafrost of Siberia and Alaska and developed a model that describes C accumulation in soils and in permafrost. The model shows a slow but consistent C increase in soil when permafrost appears. At the PHT, C-rich frozen loess of Europe and South of Siberia thawed and lost most of its carbon. Soil carbon decreases as tundra-steppe changes to forest, steppes and tundra. As a result, over 1000 Gt C was released to the atmosphere, oceans, and other terrestrial ecosystems. The model results also show that restoring the tundra-steppe ecosystem would enhance soil C storage, while providing other important ecosystem services.

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