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| Titel |
Vegetation and land carbon feedbacks in the high-resolution transient Holocene simulations using the MPI Earth system model |
| VerfasserIn |
Victor Brovkin, Stephan Lorenz, Thomas Raddatz |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250146359
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| Publikation (Nr.) |
 EGU/EGU2017-10383.pdf |
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| Zusammenfassung |
| Plants influence climate through changes in the land surface biophysics (albedo,
transpiration) and concentrations of the atmospheric greenhouse gases. One of the interesting
periods to investigate a climatic role of terrestrial biosphere is the Holocene, when, despite of
the relatively steady global climate, the atmospheric CO2 grew by about 20 ppm from 7 kyr
BP to pre-industrial. We use a new setup of the Max Planck Institute Earth System Model
MPI-ESM1 consisting of the latest version of the atmospheric model ECHAM6, including
the land surface model JSBACH3 with carbon cycle and vegetation dynamics, coupled to
the ocean circulation model MPI-OM, which includes the HAMOCC model of
ocean biogeochemistry. The model has been run for several simulations over the
Holocene period of the last 8000 years under the forcing data sets of orbital insolation,
atmospheric greenhouse gases, volcanic aerosols, solar irradiance and stratospheric ozone,
as well as land-use changes. In response to this forcing, the land carbon storage
increased by about 60 PgC between 8 and 4 kyr BP, stayed relatively constant until
2 kyr BP, and decreased by about 90 PgC by 1850 AD due to land use changes.
Vegetation and soil carbon changes significantly affected atmospheric CO2 during the
periods of strong volcanic eruptions. In response to the eruption-caused cooling, the
land initially stores more carbon as respiration decreases, but then it releases even
more carbon due to productivity decrease. This decadal- scale variability helps to
quantify the vegetation and land carbon feedbacks during the past periods when
the temporal resolution of the ice-core CO2 record is not sufficient to capture fast
CO2 variations. From a set of Holocene simulations with prescribed or interactive
atmospheric CO2, we get estimates of climate-carbon feedback useful for future climate
studies.
Members of the Hamburg Holocene Team:
Jürgen Bader1, Sebastian Bathiany2, Victor Brovkin1, Martin Claussen1,3, Traute Crüger1,
Roberta D’agostino1, Anne Dallmeyer1, Sabine Egerer1, Vivienne Groner1, Matthias
Heinze1, Tatiana Ilyina1, Johann Jungclaus1, Thomas Kleinen1, Alexander Lemburg1,
Stephan Lorenz1, Thomas Raddatz1, Hauke Schmidt1, Gerhard Schmiedl3, Bjorn Stevens1,
Claudia Timmreck1, Matthew Toohey4
1Max-Planck-Institut für Meteorologie, D
2Wageningen University, NL
3CEN, Universität Hamburg, D
4GEOMAR Helmholtz Zentrum für Ozeanforschung Kiel, D |
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