Experimental biogeochemical approach to the monitoring of baseline levels of CO2 fluxes at the sediment-water interface for CCS purpose. (Abstract/Comunicazione in atti di convegno)

Type
Label
  • Experimental biogeochemical approach to the monitoring of baseline levels of CO2 fluxes at the sediment-water interface for CCS purpose. (Abstract/Comunicazione in atti di convegno) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Alternative label
  • Federico Spagnoli, Giovanni Ciceri, Patrizia Giordano, Valter Martinotti and Monia Politi. (2011)
    Experimental biogeochemical approach to the monitoring of baseline levels of CO2 fluxes at the sediment-water interface for CCS purpose.
    in Geoitalia 2011, VIII Forum Italiano di Scienze della Terra, Torino, 19-23 settembre 2011
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Federico Spagnoli, Giovanni Ciceri, Patrizia Giordano, Valter Martinotti and Monia Politi. (literal)
Pagina inizio
  • 96 (literal)
Pagina fine
  • 97 (literal)
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  • 4 (literal)
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  • 2 (literal)
Note
  • Comunicazione (literal)
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  • ISMAR CNR RSE SpA ENEL SpA (literal)
Titolo
  • Experimental biogeochemical approach to the monitoring of baseline levels of CO2 fluxes at the sediment-water interface for CCS purpose. (literal)
Abstract
  • One of the most promising technological solutions in the CO2 Capture and Storage (CCS) is the CO2 injection in the sub-seabed deep saline aquifers. In the sub-seabed CCS a reliable monitoring of possible CO2 seeps is required in order to assure safety, containment lifetime and biological impacts. A useful CCS monitoring approach (the experimental biogeochemical approach) is to determine, before the geological storage, natural baseline levels and benthic fluxes of dissolved inorganic carbon species (pCO2 and DIC) and of other connected parameters (alkalinity, pH and 13CDIC) in seawater in order to characterize the marine carbonate system from a chemically point of view and regarding its natural or anthropogenic origin. Furthermore, the study of the early diagenesis processes generating the observed benthic fluxes is a useful complementary aspect of the CCS biogeochemical monitoring approach. The knowledge of the natural baseline levels and benthic fluxes, before the CO2 injection, will allow the comparison with data obtained after the storage operations so that possible occurrences of unexpected leakages of the CO2 injected in the geological formations under the sea bottom can be verified. This approach could also be useful employed as an \"early warning\" system SESSIONE D6 96 Epitome 2011 - Geoitalia 2011 in case of possible failure of the CO2 storage. The best method to determine dissolved benthic fluxes is the \"in situ\" measurement by benthic chamber deployments. The biogeochemical approach is particularly sound in the northern and central Adriatic Sea where numerous previous DIC and other carbonate system connected chemical benthic flux data, various early diagenesis studies and also up to date and appropriate monitoring technologies (automated benthic chamber and on deck laboratory), able to measure \"in situ\" benthic fluxes, are available and where CO2 sub-seabed storages can be carried out. Previous researches allowed the definitions of nine different diagenetic environments in the northern and central Adriatic Sea; each environment is characterized by: 1) homogeneous particulate matter and dissolved nutrient continental inputs; 2) distances from main sediment sources; 3) bottom sediment composition; 4) organic matter; 5) depths; 6) oxygenation of water column. In each diagenetic environment a natural background value of DIC, alkalinity and pH sediment-water fluxes has been assigned. These background values can be used as natural baseline in the CCS to monitoring possible seeps after the injection of CO2 in depth. At present, various researches are in progress in the Adriatic Sea for the acquisition of new data of DIC and other dissolved chemical sediment-water fluxes and on early diagenesis studies, in order to increase the background knowledge in areas or seasons not covered by previous researches. In particular, in fall 2010 and winter 2011 two cruises have been performed to measure benthic fluxes of dissolved inorganic carbon species and to determine the early diagenesis processes that origin the fluxes in the two extreme seasons in the central-western Adriatic Sea. In these last cruises benthic fluxes have been measured \"in situ\" by deployments of the ISMAR-CNR and RSE \"self-made\" benthic chamber and using an on deck laboratory. Furthermore, a technological development research is now being carried out by ISMAR-CNR and RSE for the set up of a full ocean depth (6000 m depth) Lander equipped with three benthic chambers and one micro-profiler. (literal)
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