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| Main Authors: | , , , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2016
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| Online Access: | https://doi.org/10.1594/PANGAEA.857787 |
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| _version_ | 1867170989570260992 |
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| author | Sauvage, Justine Spivack, Arthur J Murray, Richard W d'Hondt, Steven L |
| author_facet | Sauvage, Justine Spivack, Arthur J Murray, Richard W d'Hondt, Steven L |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Dissolved inorganic carbon (DIC) concentration and total alkalinity in marine sediment vary with biological activity, mineral diagenesis and past bottom ocean water composition. Reliable interpretation of this data is often compromised due to precipitation of calcium carbonate (CaCO3) during sediment recovery, processing and sample storage. Here we present and test a method that corrects for this precipitation and consequently allows quantification of in situ carbonate system chemistry. Our method relies on the over-determination of the dissolved carbonate system by (i) measuring DIC, alkalinity and calcium, and (ii) explicitly assuming CaCO3 saturation in the sediment. We experimentally tested this method using data from Integrated Ocean Drilling Program (IODP) Site U1368 in the South Pacific Gyre. Our results show that we can accurately reproduce in situ aqueous carbonate system chemistry if DIC, alkalinity and calcium concentration are measured simultaneously. At Site U1368, the correction for sampling associated precipitation is equivalent to 4.5 and 8.9% of the measured DIC and alkalinity, respectively. The method is well suited for any sediment porewater that is saturated with respect to calcium carbonate; consequently, it is applicable for approximately 50% of the global oceanic seafloor. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_857787 |
| institution | PANGAEA |
| language | en |
| publishDate | 2016 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Amount of calcium carbonate precipitation researched in IODP Hole 329-U1368C Sauvage, Justine Spivack, Arthur J Murray, Richard W d'Hondt, Steven L 329-U1368C; Calcium carbonate excess; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Exp329; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Ocean Drilling Program; ODP; Sample comment; South Pacific Gyre Microbiology Dissolved inorganic carbon (DIC) concentration and total alkalinity in marine sediment vary with biological activity, mineral diagenesis and past bottom ocean water composition. Reliable interpretation of this data is often compromised due to precipitation of calcium carbonate (CaCO3) during sediment recovery, processing and sample storage. Here we present and test a method that corrects for this precipitation and consequently allows quantification of in situ carbonate system chemistry. Our method relies on the over-determination of the dissolved carbonate system by (i) measuring DIC, alkalinity and calcium, and (ii) explicitly assuming CaCO3 saturation in the sediment. We experimentally tested this method using data from Integrated Ocean Drilling Program (IODP) Site U1368 in the South Pacific Gyre. Our results show that we can accurately reproduce in situ aqueous carbonate system chemistry if DIC, alkalinity and calcium concentration are measured simultaneously. At Site U1368, the correction for sampling associated precipitation is equivalent to 4.5 and 8.9% of the measured DIC and alkalinity, respectively. The method is well suited for any sediment porewater that is saturated with respect to calcium carbonate; consequently, it is applicable for approximately 50% of the global oceanic seafloor. |
| title | (Table 1) Amount of calcium carbonate precipitation researched in IODP Hole 329-U1368C |
| topic | 329-U1368C; Calcium carbonate excess; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Exp329; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Ocean Drilling Program; ODP; Sample comment; South Pacific Gyre Microbiology |
| url | https://doi.org/10.1594/PANGAEA.857787 |