Benthic organic carbon fluxes in the Southern Ocean: Regional differences and links to surface primary production and carbon export
Without doubt, global climate change is directly linked to the anthropogenic release of greenhouse gases such as carbon dioxide (CO2) and methane (UN IPCC-Report 2007). Therefore, research efforts to comprehend the global carbon cycle have increased during the last years. In the context of the obser...
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ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/2515 2023-05-15T13:42:31+02:00 Benthic organic carbon fluxes in the Southern Ocean: Regional differences and links to surface primary production and carbon export Sachs, Oliver Schlüter, Michael Schulz, Horst, D. 2007-09-27 application/pdf https://media.suub.uni-bremen.de/handle/elib/2515 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000110604 eng eng Universität Bremen FB5 Geowissenschaften https://media.suub.uni-bremen.de/handle/elib/2515 urn:nbn:de:gbv:46-diss000110604 info:eu-repo/semantics/openAccess benthic organic carbon fluxes deep-sea sediments Southern Ocean microsensors oxygen penetration depth export ratio 550 550 Earth sciences and geology ddc:550 Dissertation doctoralThesis 2007 ftsubbremen 2022-11-09T07:09:49Z Without doubt, global climate change is directly linked to the anthropogenic release of greenhouse gases such as carbon dioxide (CO2) and methane (UN IPCC-Report 2007). Therefore, research efforts to comprehend the global carbon cycle have increased during the last years. In the context of the observed changes, it is of particular interest to decipher the role of the hydro-, bio- and atmospheres and how the different compartments of the earth system are affected by the increase of atmospheric CO2. Due to its huge carbon inventory, the marine carbon cycle represents the most important component in this respect. Numerous findings suggest that the Southern Ocean plays a key role in terms of oceanic CO2 uptake. However, an exact quantification of such fluxes of material is hard to achieve for large areas, not least on account of the inaccessibility of this remote region. In particular, there exist so far only few accurate data for benthic carbon fluxes. The latter can be derived from high resolution pore water oxygen profiles, as one possible method. However the ex situ flux determinations carried out on sediment cores, tend to suffer from temperature and pressure artefacts. Alternatively, oxygen microprofiles can be measured in situ, i.e. at the seafloor. Until now, no such data have been published for the Southern Ocean. During the Antarctic Expedition ANT XXI/4, within the framework of this thesis, in situ and ex situ oxygen profiles were measured and used to derive benthic organic carbon fluxes. Having both types of measurements from the same locations, it was possible to establish a depth-related correction function which was applied subsequently to revise published and additional unpublished carbon fluxes to the seafloor. This resulted in a consistent data base of benthic carbon inputs covering many important sub-regions of the Southern Ocean including the Amundsen and Bellingshausen Seas (southern Pacific), Scotia and Weddell Seas (southern South Atlantic) as well as the Crozet Basin (southern Indian Ocean). ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Southern Ocean Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) Antarctic Indian Pacific Southern Ocean The Antarctic Weddell |
institution |
Open Polar |
collection |
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
op_collection_id |
ftsubbremen |
language |
English |
topic |
benthic organic carbon fluxes deep-sea sediments Southern Ocean microsensors oxygen penetration depth export ratio 550 550 Earth sciences and geology ddc:550 |
spellingShingle |
benthic organic carbon fluxes deep-sea sediments Southern Ocean microsensors oxygen penetration depth export ratio 550 550 Earth sciences and geology ddc:550 Sachs, Oliver Benthic organic carbon fluxes in the Southern Ocean: Regional differences and links to surface primary production and carbon export |
topic_facet |
benthic organic carbon fluxes deep-sea sediments Southern Ocean microsensors oxygen penetration depth export ratio 550 550 Earth sciences and geology ddc:550 |
description |
Without doubt, global climate change is directly linked to the anthropogenic release of greenhouse gases such as carbon dioxide (CO2) and methane (UN IPCC-Report 2007). Therefore, research efforts to comprehend the global carbon cycle have increased during the last years. In the context of the observed changes, it is of particular interest to decipher the role of the hydro-, bio- and atmospheres and how the different compartments of the earth system are affected by the increase of atmospheric CO2. Due to its huge carbon inventory, the marine carbon cycle represents the most important component in this respect. Numerous findings suggest that the Southern Ocean plays a key role in terms of oceanic CO2 uptake. However, an exact quantification of such fluxes of material is hard to achieve for large areas, not least on account of the inaccessibility of this remote region. In particular, there exist so far only few accurate data for benthic carbon fluxes. The latter can be derived from high resolution pore water oxygen profiles, as one possible method. However the ex situ flux determinations carried out on sediment cores, tend to suffer from temperature and pressure artefacts. Alternatively, oxygen microprofiles can be measured in situ, i.e. at the seafloor. Until now, no such data have been published for the Southern Ocean. During the Antarctic Expedition ANT XXI/4, within the framework of this thesis, in situ and ex situ oxygen profiles were measured and used to derive benthic organic carbon fluxes. Having both types of measurements from the same locations, it was possible to establish a depth-related correction function which was applied subsequently to revise published and additional unpublished carbon fluxes to the seafloor. This resulted in a consistent data base of benthic carbon inputs covering many important sub-regions of the Southern Ocean including the Amundsen and Bellingshausen Seas (southern Pacific), Scotia and Weddell Seas (southern South Atlantic) as well as the Crozet Basin (southern Indian Ocean). ... |
author2 |
Schlüter, Michael Schulz, Horst, D. |
format |
Doctoral or Postdoctoral Thesis |
author |
Sachs, Oliver |
author_facet |
Sachs, Oliver |
author_sort |
Sachs, Oliver |
title |
Benthic organic carbon fluxes in the Southern Ocean: Regional differences and links to surface primary production and carbon export |
title_short |
Benthic organic carbon fluxes in the Southern Ocean: Regional differences and links to surface primary production and carbon export |
title_full |
Benthic organic carbon fluxes in the Southern Ocean: Regional differences and links to surface primary production and carbon export |
title_fullStr |
Benthic organic carbon fluxes in the Southern Ocean: Regional differences and links to surface primary production and carbon export |
title_full_unstemmed |
Benthic organic carbon fluxes in the Southern Ocean: Regional differences and links to surface primary production and carbon export |
title_sort |
benthic organic carbon fluxes in the southern ocean: regional differences and links to surface primary production and carbon export |
publisher |
Universität Bremen |
publishDate |
2007 |
url |
https://media.suub.uni-bremen.de/handle/elib/2515 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000110604 |
geographic |
Antarctic Indian Pacific Southern Ocean The Antarctic Weddell |
geographic_facet |
Antarctic Indian Pacific Southern Ocean The Antarctic Weddell |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
https://media.suub.uni-bremen.de/handle/elib/2515 urn:nbn:de:gbv:46-diss000110604 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766168728829952000 |