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Dynamics of the terrestrial biosphere, climate and atmospheric CO2 concentration during interglacials: a comparison between Eemian and Holocene

Schurgers, Guy LU ; Mikolajewicz, Uwe; Gröger, Matthias; Maier-Reimer, Ernst; Vizcaíno, Miren and Winguth, Arne (2006) In Climate of the Past 2. p.205-220
Abstract
A complex earth system model (atmosphere and ocean general circulation models, ocean biogeochemistry and terrestrial biosphere) was used to perform transient simulations of two interglacial sections (Eemian, 128-113 ky B. P., and Holocene, 9 ky B.P.-present). The changes in terrestrial carbon storage during these interglacials were studied with respect to changes in the earth's orbit. The effects of different climate factors on changes in carbon storage were studied in offline experiments in which the vegetation model was forced only with temperature, hydrological parameters, radiation, or CO2 concentration from the transient runs. The largest anomalies in terrestrial carbon storage were caused by temperature changes. However, the increase... (More)
A complex earth system model (atmosphere and ocean general circulation models, ocean biogeochemistry and terrestrial biosphere) was used to perform transient simulations of two interglacial sections (Eemian, 128-113 ky B. P., and Holocene, 9 ky B.P.-present). The changes in terrestrial carbon storage during these interglacials were studied with respect to changes in the earth's orbit. The effects of different climate factors on changes in carbon storage were studied in offline experiments in which the vegetation model was forced only with temperature, hydrological parameters, radiation, or CO2 concentration from the transient runs. The largest anomalies in terrestrial carbon storage were caused by temperature changes. However, the increase in storage due to forest expansion and increased photosynthesis in the high latitudes was nearly balanced by the decrease due to increased respiration. Large positive effects on carbon storage were caused by an enhanced monsoon circulation in the subtropics between 128 and 121 ky B. P. and between 9 and 6 ky B. P., and by increases in incoming radiation during summer for 45 degrees to 70 degrees N compared to a control simulation with present-day insolation. Compared to this control simulation, the net effect of these changes was a positive carbon storage anomaly in the terrestrial biosphere of about 200 Pg C for 125 ky B. P. and 7 ky B. P., and a negative anomaly around 150 Pg C for 116 ky B. P. Although the net increases for Eemian and Holocene were rather similar, the magnitudes of the processes causing these effects were different. The decrease in terrestrial carbon storage during the experiments was the main driver of an increase in atmospheric CO2 concentration during both the Eemian and the Holocene. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Climate of the Past
volume
2
pages
205 - 220
publisher
Copernicus Gesellschaft mbH
external identifiers
  • wos:000244506500011
  • scopus:34347405648
ISSN
1814-9332
language
English
LU publication?
no
id
1c1257c4-2ea9-4e23-9013-92731f841b7a (old id 619470)
alternative location
http://direct.sref.org/1814-9332/cp/2006-2-205
date added to LUP
2007-12-17 12:24:41
date last changed
2019-04-07 04:21:00
@article{1c1257c4-2ea9-4e23-9013-92731f841b7a,
  abstract     = {A complex earth system model (atmosphere and ocean general circulation models, ocean biogeochemistry and terrestrial biosphere) was used to perform transient simulations of two interglacial sections (Eemian, 128-113 ky B. P., and Holocene, 9 ky B.P.-present). The changes in terrestrial carbon storage during these interglacials were studied with respect to changes in the earth's orbit. The effects of different climate factors on changes in carbon storage were studied in offline experiments in which the vegetation model was forced only with temperature, hydrological parameters, radiation, or CO2 concentration from the transient runs. The largest anomalies in terrestrial carbon storage were caused by temperature changes. However, the increase in storage due to forest expansion and increased photosynthesis in the high latitudes was nearly balanced by the decrease due to increased respiration. Large positive effects on carbon storage were caused by an enhanced monsoon circulation in the subtropics between 128 and 121 ky B. P. and between 9 and 6 ky B. P., and by increases in incoming radiation during summer for 45 degrees to 70 degrees N compared to a control simulation with present-day insolation. Compared to this control simulation, the net effect of these changes was a positive carbon storage anomaly in the terrestrial biosphere of about 200 Pg C for 125 ky B. P. and 7 ky B. P., and a negative anomaly around 150 Pg C for 116 ky B. P. Although the net increases for Eemian and Holocene were rather similar, the magnitudes of the processes causing these effects were different. The decrease in terrestrial carbon storage during the experiments was the main driver of an increase in atmospheric CO2 concentration during both the Eemian and the Holocene.},
  author       = {Schurgers, Guy and Mikolajewicz, Uwe and Gröger, Matthias and Maier-Reimer, Ernst and Vizcaíno, Miren and Winguth, Arne},
  issn         = {1814-9332},
  language     = {eng},
  pages        = {205--220},
  publisher    = {Copernicus Gesellschaft mbH},
  series       = {Climate of the Past},
  title        = {Dynamics of the terrestrial biosphere, climate and atmospheric CO2 concentration during interglacials: a comparison between Eemian and Holocene},
  volume       = {2},
  year         = {2006},
}