Dissolved inorganic carbon dynamics during coccolithophorid blooms in the northeast European continental margin (northern Bay of Biscay), University of Liège
Since, the onset of the Industrial Revolution, anthropogenic emissions have increased the atmospheric CO2 concentration at a rate three times faster than observed during glacial interglacial cycles. The oceans play a critical role in the global carbon cycle as they are by far the largest reservoir o...
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ULiège - Université de Liège
2010
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ftorbi:oai:orbi.ulg.ac.be:2268/252020 2024-10-20T14:10:42+00:00 Dissolved inorganic carbon dynamics during coccolithophorid blooms in the northeast European continental margin (northern Bay of Biscay), University of Liège Suykens, Kim Borges, Alberto FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège 2010 160 https://orbi.uliege.be/handle/2268/252020 en eng ULiège - Université de Liège https://orbi.uliege.be/handle/2268/252020 info:hdl:2268/252020 restricted access http://purl.org/coar/access_right/c_16ec info:eu-repo/semantics/restrictedAccess Life sciences Aquatic sciences & oceanology Sciences du vivant Sciences aquatiques & océanologie doctoral thesis http://purl.org/coar/resource_type/c_db06 info:eu-repo/semantics/doctoralThesis 2010 ftorbi 2024-09-27T07:01:46Z Since, the onset of the Industrial Revolution, anthropogenic emissions have increased the atmospheric CO2 concentration at a rate three times faster than observed during glacial interglacial cycles. The oceans play a critical role in the global carbon cycle as they are by far the largest reservoir of carbon on Earth that regulates atmospheric CO2 concentrations, and has already absorbed 48 % of the anthropogenic CO2 emitted, mainly by fossil fuel burning and cement manufacturing (Sabine et al., 2004). The CO2 that dissolves in the surface waters and exchanges with the atmosphere is regulated by three pumps (physical, chemical and biological) which maintain the vertical gradient in CO2 between the surface ocean and the deep ocean layers. Global simulations predict important changes in the carbon budget due to alterations of the marine organic and inorganic carbon pumps as a result of ocean acidification. Coccolithophores are one of the most important contributors to the inorganic carbon pump. Nevertheless, little is known about the potential changes of these communities in response to increasing CO2 concentration and the feedbacks on climate change. The aims of this thesis are to evaluate the effect of net community calcification (NCC) and net community production (NCP) during coccolithophorid bloom development in the northern Bay of Biscay on seawater carbonate chemistry and in particular on the flux of CO2 across the air-sea interface; to evaluate the diagenetic organic carbon degradation and the potential CaCO3 dissolution in sediments. These results will contribute to a better understanding of the response of marine calcifying ecosystems to ocean acidification and climate change, as well as the associated feedback mechanisms. It was observed that the effect of NCC in decreasing the CO2 sink during the cruises was low (on average ~12 % of the total air-sea CO2 flux). If this is a general feature in naturally occurring phytoplankton blooms in the northern North Atlantic and in the global ocean, then the ... Doctoral or Postdoctoral Thesis North Atlantic Ocean acidification University of Liège: ORBi (Open Repository and Bibliography) Liège ENVELOPE(-61.917,-61.917,-64.033,-64.033) |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
Life sciences Aquatic sciences & oceanology Sciences du vivant Sciences aquatiques & océanologie |
spellingShingle |
Life sciences Aquatic sciences & oceanology Sciences du vivant Sciences aquatiques & océanologie Suykens, Kim Dissolved inorganic carbon dynamics during coccolithophorid blooms in the northeast European continental margin (northern Bay of Biscay), University of Liège |
topic_facet |
Life sciences Aquatic sciences & oceanology Sciences du vivant Sciences aquatiques & océanologie |
description |
Since, the onset of the Industrial Revolution, anthropogenic emissions have increased the atmospheric CO2 concentration at a rate three times faster than observed during glacial interglacial cycles. The oceans play a critical role in the global carbon cycle as they are by far the largest reservoir of carbon on Earth that regulates atmospheric CO2 concentrations, and has already absorbed 48 % of the anthropogenic CO2 emitted, mainly by fossil fuel burning and cement manufacturing (Sabine et al., 2004). The CO2 that dissolves in the surface waters and exchanges with the atmosphere is regulated by three pumps (physical, chemical and biological) which maintain the vertical gradient in CO2 between the surface ocean and the deep ocean layers. Global simulations predict important changes in the carbon budget due to alterations of the marine organic and inorganic carbon pumps as a result of ocean acidification. Coccolithophores are one of the most important contributors to the inorganic carbon pump. Nevertheless, little is known about the potential changes of these communities in response to increasing CO2 concentration and the feedbacks on climate change. The aims of this thesis are to evaluate the effect of net community calcification (NCC) and net community production (NCP) during coccolithophorid bloom development in the northern Bay of Biscay on seawater carbonate chemistry and in particular on the flux of CO2 across the air-sea interface; to evaluate the diagenetic organic carbon degradation and the potential CaCO3 dissolution in sediments. These results will contribute to a better understanding of the response of marine calcifying ecosystems to ocean acidification and climate change, as well as the associated feedback mechanisms. It was observed that the effect of NCC in decreasing the CO2 sink during the cruises was low (on average ~12 % of the total air-sea CO2 flux). If this is a general feature in naturally occurring phytoplankton blooms in the northern North Atlantic and in the global ocean, then the ... |
author2 |
Borges, Alberto FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège |
format |
Doctoral or Postdoctoral Thesis |
author |
Suykens, Kim |
author_facet |
Suykens, Kim |
author_sort |
Suykens, Kim |
title |
Dissolved inorganic carbon dynamics during coccolithophorid blooms in the northeast European continental margin (northern Bay of Biscay), University of Liège |
title_short |
Dissolved inorganic carbon dynamics during coccolithophorid blooms in the northeast European continental margin (northern Bay of Biscay), University of Liège |
title_full |
Dissolved inorganic carbon dynamics during coccolithophorid blooms in the northeast European continental margin (northern Bay of Biscay), University of Liège |
title_fullStr |
Dissolved inorganic carbon dynamics during coccolithophorid blooms in the northeast European continental margin (northern Bay of Biscay), University of Liège |
title_full_unstemmed |
Dissolved inorganic carbon dynamics during coccolithophorid blooms in the northeast European continental margin (northern Bay of Biscay), University of Liège |
title_sort |
dissolved inorganic carbon dynamics during coccolithophorid blooms in the northeast european continental margin (northern bay of biscay), university of liège |
publisher |
ULiège - Université de Liège |
publishDate |
2010 |
url |
https://orbi.uliege.be/handle/2268/252020 |
long_lat |
ENVELOPE(-61.917,-61.917,-64.033,-64.033) |
geographic |
Liège |
geographic_facet |
Liège |
genre |
North Atlantic Ocean acidification |
genre_facet |
North Atlantic Ocean acidification |
op_relation |
https://orbi.uliege.be/handle/2268/252020 info:hdl:2268/252020 |
op_rights |
restricted access http://purl.org/coar/access_right/c_16ec info:eu-repo/semantics/restrictedAccess |
_version_ |
1813450702695956480 |