Long-term deglacial permafrost carbon dynamics in MPI-ESM
We have developed a new module to calculate soil organic carbon (SOC) accumulation in perennially frozen ground in the land surface model JSBACH. Running this offline version of MPI-ESM we have modelled long-term permafrost carbon accumulation and release from the Last Glacial Maximum (LGM) to the p...
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fttriple:oai:gotriple.eu:oai:doaj.org/article:6694f101868742c0adb7eda85729cb64 2023-05-15T16:36:58+02:00 Long-term deglacial permafrost carbon dynamics in MPI-ESM T. Schneider von Deimling T. Kleinen G. Hugelius C. Knoblauch C. Beer V. Brovkin 2018-12-01 https://doi.org/10.5194/cp-14-2011-2018 https://www.clim-past.net/14/2011/2018/cp-14-2011-2018.pdf https://doaj.org/article/6694f101868742c0adb7eda85729cb64 en eng Copernicus Publications doi:10.5194/cp-14-2011-2018 1814-9324 1814-9332 https://www.clim-past.net/14/2011/2018/cp-14-2011-2018.pdf https://doaj.org/article/6694f101868742c0adb7eda85729cb64 undefined Climate of the Past, Vol 14, Pp 2011-2036 (2018) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.5194/cp-14-2011-2018 2023-01-22T19:11:46Z We have developed a new module to calculate soil organic carbon (SOC) accumulation in perennially frozen ground in the land surface model JSBACH. Running this offline version of MPI-ESM we have modelled long-term permafrost carbon accumulation and release from the Last Glacial Maximum (LGM) to the pre-industrial (PI) age. Our simulated near-surface PI permafrost extent of 16.9 × 106 km2 is close to observational estimates. Glacial boundary conditions, especially ice sheet coverage, result in profoundly different spatial patterns of glacial permafrost extent. Deglacial warming leads to large-scale changes in soil temperatures, manifested in permafrost disappearance in southerly regions, and permafrost aggregation in formerly glaciated grid cells. In contrast to the large spatial shift in simulated permafrost occurrence, we infer an only moderate increase in total LGM permafrost area (18.3 × 106 km2) – together with pronounced changes in the depth of seasonal thaw. Earlier empirical reconstructions suggest a larger spread of permafrost towards more southerly regions under glacial conditions, but with a highly uncertain extent of non-continuous permafrost.Compared to a control simulation without describing the transport of SOC into perennially frozen ground, the implementation of our newly developed module for simulating permafrost SOC accumulation leads to a doubling of simulated LGM permafrost SOC storage (amounting to a total of ∼ 150 PgC). Despite LGM temperatures favouring a larger permafrost extent, simulated cold glacial temperatures – together with low precipitation and low CO2 levels – limit vegetation productivity and therefore prevent a larger glacial SOC build-up in our model. Changes in physical and biogeochemical boundary conditions during deglacial warming lead to an increase in mineral SOC storage towards the Holocene (168 PgC at PI), which is below observational estimates (575 PgC in continuous and discontinuous permafrost). Additional model experiments clarified the sensitivity of simulated SOC ... Article in Journal/Newspaper Ice Ice Sheet permafrost Unknown Climate of the Past 14 12 2011 2036 |
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geo envir T. Schneider von Deimling T. Kleinen G. Hugelius C. Knoblauch C. Beer V. Brovkin Long-term deglacial permafrost carbon dynamics in MPI-ESM |
topic_facet |
geo envir |
description |
We have developed a new module to calculate soil organic carbon (SOC) accumulation in perennially frozen ground in the land surface model JSBACH. Running this offline version of MPI-ESM we have modelled long-term permafrost carbon accumulation and release from the Last Glacial Maximum (LGM) to the pre-industrial (PI) age. Our simulated near-surface PI permafrost extent of 16.9 × 106 km2 is close to observational estimates. Glacial boundary conditions, especially ice sheet coverage, result in profoundly different spatial patterns of glacial permafrost extent. Deglacial warming leads to large-scale changes in soil temperatures, manifested in permafrost disappearance in southerly regions, and permafrost aggregation in formerly glaciated grid cells. In contrast to the large spatial shift in simulated permafrost occurrence, we infer an only moderate increase in total LGM permafrost area (18.3 × 106 km2) – together with pronounced changes in the depth of seasonal thaw. Earlier empirical reconstructions suggest a larger spread of permafrost towards more southerly regions under glacial conditions, but with a highly uncertain extent of non-continuous permafrost.Compared to a control simulation without describing the transport of SOC into perennially frozen ground, the implementation of our newly developed module for simulating permafrost SOC accumulation leads to a doubling of simulated LGM permafrost SOC storage (amounting to a total of ∼ 150 PgC). Despite LGM temperatures favouring a larger permafrost extent, simulated cold glacial temperatures – together with low precipitation and low CO2 levels – limit vegetation productivity and therefore prevent a larger glacial SOC build-up in our model. Changes in physical and biogeochemical boundary conditions during deglacial warming lead to an increase in mineral SOC storage towards the Holocene (168 PgC at PI), which is below observational estimates (575 PgC in continuous and discontinuous permafrost). Additional model experiments clarified the sensitivity of simulated SOC ... |
format |
Article in Journal/Newspaper |
author |
T. Schneider von Deimling T. Kleinen G. Hugelius C. Knoblauch C. Beer V. Brovkin |
author_facet |
T. Schneider von Deimling T. Kleinen G. Hugelius C. Knoblauch C. Beer V. Brovkin |
author_sort |
T. Schneider von Deimling |
title |
Long-term deglacial permafrost carbon dynamics in MPI-ESM |
title_short |
Long-term deglacial permafrost carbon dynamics in MPI-ESM |
title_full |
Long-term deglacial permafrost carbon dynamics in MPI-ESM |
title_fullStr |
Long-term deglacial permafrost carbon dynamics in MPI-ESM |
title_full_unstemmed |
Long-term deglacial permafrost carbon dynamics in MPI-ESM |
title_sort |
long-term deglacial permafrost carbon dynamics in mpi-esm |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-14-2011-2018 https://www.clim-past.net/14/2011/2018/cp-14-2011-2018.pdf https://doaj.org/article/6694f101868742c0adb7eda85729cb64 |
genre |
Ice Ice Sheet permafrost |
genre_facet |
Ice Ice Sheet permafrost |
op_source |
Climate of the Past, Vol 14, Pp 2011-2036 (2018) |
op_relation |
doi:10.5194/cp-14-2011-2018 1814-9324 1814-9332 https://www.clim-past.net/14/2011/2018/cp-14-2011-2018.pdf https://doaj.org/article/6694f101868742c0adb7eda85729cb64 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-14-2011-2018 |
container_title |
Climate of the Past |
container_volume |
14 |
container_issue |
12 |
container_start_page |
2011 |
op_container_end_page |
2036 |
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1766027274991173632 |