Carbon exchange in Western Siberian watershed mires and implication for the greenhouse effect : A spatial temporal modeling approach
The vast watershed mires of Western Siberia formed a significant sink of carbon during the Holocene. Because of their large area these mires might play an important role in the carbon exchange between terrestrial ecosystems and the atmosphere. However, estimation of the Holocene and future carbon ba...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/19580 2023-07-23T04:22:00+02:00 Carbon exchange in Western Siberian watershed mires and implication for the greenhouse effect : A spatial temporal modeling approach Borren, W. 2007-01-19 image/pdf https://dspace.library.uu.nl/handle/1874/19580 en eng 0169-4839 https://dspace.library.uu.nl/handle/1874/19580 info:eu-repo/semantics/OpenAccess Aardwetenschappen Milieukunde peat carbon greenhouse effect Western Siberia spatial modeling hydrology Dissertation 2007 ftunivutrecht 2023-07-01T23:15:29Z The vast watershed mires of Western Siberia formed a significant sink of carbon during the Holocene. Because of their large area these mires might play an important role in the carbon exchange between terrestrial ecosystems and the atmosphere. However, estimation of the Holocene and future carbon balance of whole Western Siberian mires is hampered by the lack of spatially resolved models. The main objective was to assess the carbon exchange fluxes of the mires using a 3-D dynamic approach. These exchange fluxes comprise the sequestration of carbon dioxide (CO2) by peat growth, the emission of methane (CH4) by anaerobic peat decay and the emission of CO2 by aerobic peat decay. From the detailed analysis of peat cores from different sites in the southern taiga of Western Siberia, it emerged that Holocene peat growth and carbon accumulation had different trends, caused by variations in vegetation succession. These differences were strongly influenced by the position in the landscape. Therefore, the effect of climatic change on mire development varied spatially. The indirect effects of climate change through local hydrology appeared to be more important than direct influences of changes in precipitation and temperature. Mire development is closely connected to hydrological dynamics. In the thesis a 3-D dynamic modeling approach is described that makes use of groundwater modeling. In successive timesteps peat growth and decay as well as mire type distribution were calculated, depending on hydrological conditions. The model was forced with a paleo-precipitation record to include variable climatic input. The model results show the Holocene development of a watershed mire from a few small spots to a contiguous mire landscape. As hydrology is the major limiting factor, the mire development is most sensitive to precipitation and evapotranspiration. Under unchanged conditions the mire will grow further, eventually reaching its maximum peat thickness around 11400 yr A.D. Under wetter climatic conditions the mire growth ... Doctoral or Postdoctoral Thesis taiga Siberia Utrecht University Repository |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Aardwetenschappen Milieukunde peat carbon greenhouse effect Western Siberia spatial modeling hydrology |
spellingShingle |
Aardwetenschappen Milieukunde peat carbon greenhouse effect Western Siberia spatial modeling hydrology Borren, W. Carbon exchange in Western Siberian watershed mires and implication for the greenhouse effect : A spatial temporal modeling approach |
topic_facet |
Aardwetenschappen Milieukunde peat carbon greenhouse effect Western Siberia spatial modeling hydrology |
description |
The vast watershed mires of Western Siberia formed a significant sink of carbon during the Holocene. Because of their large area these mires might play an important role in the carbon exchange between terrestrial ecosystems and the atmosphere. However, estimation of the Holocene and future carbon balance of whole Western Siberian mires is hampered by the lack of spatially resolved models. The main objective was to assess the carbon exchange fluxes of the mires using a 3-D dynamic approach. These exchange fluxes comprise the sequestration of carbon dioxide (CO2) by peat growth, the emission of methane (CH4) by anaerobic peat decay and the emission of CO2 by aerobic peat decay. From the detailed analysis of peat cores from different sites in the southern taiga of Western Siberia, it emerged that Holocene peat growth and carbon accumulation had different trends, caused by variations in vegetation succession. These differences were strongly influenced by the position in the landscape. Therefore, the effect of climatic change on mire development varied spatially. The indirect effects of climate change through local hydrology appeared to be more important than direct influences of changes in precipitation and temperature. Mire development is closely connected to hydrological dynamics. In the thesis a 3-D dynamic modeling approach is described that makes use of groundwater modeling. In successive timesteps peat growth and decay as well as mire type distribution were calculated, depending on hydrological conditions. The model was forced with a paleo-precipitation record to include variable climatic input. The model results show the Holocene development of a watershed mire from a few small spots to a contiguous mire landscape. As hydrology is the major limiting factor, the mire development is most sensitive to precipitation and evapotranspiration. Under unchanged conditions the mire will grow further, eventually reaching its maximum peat thickness around 11400 yr A.D. Under wetter climatic conditions the mire growth ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Borren, W. |
author_facet |
Borren, W. |
author_sort |
Borren, W. |
title |
Carbon exchange in Western Siberian watershed mires and implication for the greenhouse effect : A spatial temporal modeling approach |
title_short |
Carbon exchange in Western Siberian watershed mires and implication for the greenhouse effect : A spatial temporal modeling approach |
title_full |
Carbon exchange in Western Siberian watershed mires and implication for the greenhouse effect : A spatial temporal modeling approach |
title_fullStr |
Carbon exchange in Western Siberian watershed mires and implication for the greenhouse effect : A spatial temporal modeling approach |
title_full_unstemmed |
Carbon exchange in Western Siberian watershed mires and implication for the greenhouse effect : A spatial temporal modeling approach |
title_sort |
carbon exchange in western siberian watershed mires and implication for the greenhouse effect : a spatial temporal modeling approach |
publishDate |
2007 |
url |
https://dspace.library.uu.nl/handle/1874/19580 |
genre |
taiga Siberia |
genre_facet |
taiga Siberia |
op_relation |
0169-4839 https://dspace.library.uu.nl/handle/1874/19580 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1772188452910006272 |