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  • 1
    Publication Date: 2023-02-08
    Description: The vast majority of freshly produced oceanic dissolved organic carbon (DOC) is derived from marine phytoplankton, then rapidly recycled by heterotrophic microbes. A small fraction of this DOC survives long enough to be routed to the interior ocean, which houses the largest and oldest DOC reservoir. DOC reactivity depends upon its intrinsic chemical composition and extrinsic environmental conditions. Therefore, recalcitrance is an emergent property of DOC that is analytically difficult to constrain. New isotopic techniques that track the flow of carbon through individual organic molecules show promise in unveiling specific biosynthetic or degradation pathways that control the metabolic turnover of DOC and its accumulation in the deep ocean. However, a multivariate approach is required to constrain current carbon fluxes so that we may better predict how the cycling of oceanic DOC will be altered with continued climate change. Ocean warming, acidification, and oxygen depletion may upset the balance between the primary production and heterotrophic reworking of DOC, thus modifying the amount and/or composition of recalcitrant DOC. Climate change and anthropogenic activities may enhance mobilization of terrestrial DOC and/or stimulate DOC production in coastal waters, but it is unclear how this would affect the flux of DOC to the open ocean. Here, we assess current knowledge on the oceanic DOC cycle and identify research gaps that must be addressed to successfully implement its use in global scale carbon models.
    Type: Article , PeerReviewed
    Format: text
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  • 2
    Publication Date: 2024-02-07
    Description: Rock-derived or petrogenic organic carbon has traditionally been regarded as being non-bioavailable and bypassing the active carbon cycle when eroded. However, it has become apparent that this organic carbon might not be so inert, especially in fjord systems where petrogenic organic carbon influxes can be high, making its degradation another potential source of greenhouse gas emissions. The extent to which subsurface micro-organisms use this organic carbon is not well constrained, despite its potential impacts on global carbon cycling. Here, we performed compound-specific radiocarbon analyses on intact polar lipid–fatty acids of live micro-organisms from marine sediments in Hornsund Fjord, Svalbard. By this means, we estimate that local bacterial communities utilize between 5 ± 2% and 55 ± 6% (average of 25 ± 16%) of petrogenic organic carbon for their biosynthesis, providing evidence for the important role of petrogenic organic carbon as a substrate after sediment redeposition. We hypothesize that the lack of sufficient recently synthesized organic carbon from primary production forces micro-organisms into utilization of petrogenic organic carbon as an alternative energy source. The input of petrogenic organic carbon to marine sediments and subsequent utilization by subsurface micro-organisms represents a natural source of fossil greenhouse gas emissions over geological timescales.
    Type: Article , PeerReviewed
    Format: text
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  • 3
    Publication Date: 2023-03-11
    Description: Distribution of intact polar membrane lipids (IPLs) in different soil profiles and in fluvial and marine sediments along the pathway of transport in a small catchment in the high Arctic at Ny-Ålesund, Svalbard (79N, 12E).
    Keywords: Arctic; Bayelva River; BDA_Bayelva_River; BDA_KH_trough; BDA_Kongsfjord; BDA_LDA; BDA_Middle_stream; BDA_UDA; BDA_UDA_a; BDA_UDA_b; BDA_Upper_stream; Betaine lipids, per unit mass total organic carbon; Comment; DEPTH, sediment/rock; Dietherglycerol phosphatidylethanolamine, per unit mass total organic carbon; Diglycosyldiacylglycerol, per unit mass total organic carbon; Diphosphatidylglycerol, per unit mass total organic carbon; Elevation of event; Event label; Fluvial sediment; FLUVS; Glucuronic acid diacylglycerol, per unit mass total organic carbon; Glycosidic ceramide, per unit mass total organic carbon; Heterocyst glycolipids, per unit mass total organic carbon; Intact polar lipids; Intact polar membrane lipids, per unit mass total organic carbon; Kohlhaugen Hill: trough; Kongsfjord; Latitude of event; Liquid chromatography-mass spectrometry (LC-MS); Location; Longitude of event; Lower drainage area; microbial community; Middle stream; Monoglycosyldiacylglycerol, per unit mass total organic carbon; Ornithine lipids, per unit mass total organic carbon; Ornithine lipids, unknown structure, per unit mass total organic carbon; Phosphatidic acid, per unit mass total organic carbon; Phosphatidylcholine, per unit mass total organic carbon; Phosphatidylethanolamine, per unit mass total organic carbon; Phosphatidylglycerol, per unit mass total organic carbon; Phosphatidylinositol, per unit mass total organic carbon; SOIL; Soil profile; Sulfoquinovosyldiacylglycerol, per unit mass total organic carbon; Svalbard; Upper drainage area; Upper stream
    Type: Dataset
    Format: text/tab-separated-values, 172 data points
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  • 4
    Publication Date: 2023-03-11
    Description: Distribution of bacteriohopanepolyols (BHPs) in different soil profiles and in fluvial and marine sediments along the pathway of transport in a small catchment in the high Arctic at Ny-Ålesund, Svalbard (79N, 12E).
    Keywords: 2-methyl adenosylhopane-type-1, per unit mass total organic carbon; 2-methyl adenosylhopane-type-2, per unit mass total organic carbon; 2-methylbacteriohopanehexol cyclitol ether, per unit mass total organic carbon; 2-methylbacteriohopanepentol, per unit mass total organic carbon; 2-methylbacteriohopanetetrol, per unit mass total organic carbon; 2-methylbacteriohopanetetrol pentose, per unit mass total organic carbon; Adenosylhopane, per unit mass total organic carbon; Adenosylhopane-type 1, per unit mass total organic carbon; Adenosylhopane-type 2, per unit mass total organic carbon; Aminobacteriohopanetriol, per unit mass total organic carbon; Aminopentol, per unit mass total organic carbon; Aminotetrol, per unit mass total organic carbon; Arctic; Bacteriohopanehexol cyclitol ether, per unit mass total organic carbon; Bacteriohopanepentol cyclitol ether, per unit mass total organic carbon; Bacteriohopanepolyols; Bacteriohopanepolyols, per unit mass total organic carbon; Bacteriohopanetetrol, per unit mass total organic carbon; Bacteriohopanetetrol cyclitol ether, per unit mass total organic carbon; Bacteriohopanetetrol pentose, per unit mass total organic carbon; Bayelva River; BDA_Bayelva_River; BDA_KH_trough; BDA_Kongsfjord; BDA_LDA; BDA_LH; BDA_Middle_stream; BDA_UDA; BDA_UDA_a; BDA_UDA_b; BDA_Upper_stream; Comment; DEPTH, sediment/rock; Elevation of event; Event label; Fluvial sediment; FLUVS; Kohlhaugen Hill: trough; Kongsfjord; Latitude of event; Leierhaugen Hill; Liquid chromatography-mass spectrometry (LC-MS); Location; Longitude of event; Lower drainage area; microbial community; Middle stream; SOIL; Soil profile; Svalbard; Upper drainage area; Upper stream
    Type: Dataset
    Format: text/tab-separated-values, 308 data points
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  • 5
    Publication Date: 2023-03-11
    Description: Distribution of elemental data (TOC, N, C/N) in different soil profiles and in fluvial and marine sediments along the pathway of transport in a small catchment in the high Arctic at Ny-Ålesund, Svalbard (79N, 12E).
    Keywords: Arctic; Bayelva River; BDA_Bayelva_River; BDA_KH_trough; BDA_Kongsfjord; BDA_LDA; BDA_LH; BDA_Middle_stream; BDA_UDA; BDA_UDA_a; BDA_UDA_b; BDA_Upper_stream; Carbon, organic, total; Carbon/Nitrogen ratio; Comment; DEPTH, sediment/rock; Element analyser CHN-O Rapid, Heraeus; Elevation of event; Event label; Fluvial sediment; FLUVS; Kohlhaugen Hill: trough; Kongsfjord; Latitude of event; Leierhaugen Hill; Location; Longitude of event; Lower drainage area; Middle stream; Nitrogen, total; SOIL; Soil profile; Svalbard; Upper drainage area; Upper stream
    Type: Dataset
    Format: text/tab-separated-values, 146 data points
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  • 6
    Publication Date: 2023-06-14
    Description: The dataset includes solid-phase geochemistry data of sediment cores from Site C0023 (Hole A) that was recovered during International Ocean Discovery Program (IODP) Expedition 370 in the Nankai Trough offshore Japan in the Pacific Ocean (Drilling vessel Chikyu). Site C0023 was established on 17 September 2016. Coring terminated on 3 November 2016. Stable carbon isotopes of total organic carbon measurement occurred on an EA-IRMS system after complete decalcification of homogenized sediment samples with 10% HCl. The δ13C-TOC values are expressed relative to VPDB (Vienna Pee Dee Belemnite).
    Keywords: 370-C0023A; Chikyu; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Element analyser isotope ratio mass spectrometer (EA-IRMS); Exp370; Hole A; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; IODP Expedition 370; J-CORES sample ID; Nankai Trough; Sample code/label; Sample ID; Site C0023; δ13C, total organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 1031 data points
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  • 7
    Publication Date: 2023-06-14
    Description: The dataset includes rock magnetic end-member unmixing data of sediment cores from Site C0023 (Hole A) that was recovered during International Ocean Discovery Program (IODP) Expedition 370 in the Nankai Trough offshore Japan in the Pacific Ocean (Drilling vessel Chikyu). Site C0023 was established on 17 September 2016. Coring terminated on 3 November 2016. End-member modelling of isothermal remanent magnetization (IRM) acquisition curves were performed to characterize the iron mineralogy. IRM acquisition curves were measured using a Princeton Measurements Corporation Vibrating Sample Magnetometer (VSM). IRM was imparted stepwise (non-linearly) up to a maximum field of 1 T with an averaging time of 200 ms. Unmixing of IRM acquisition curves were performed using the web application MAX UnMix by Maxbauer et al. (2016). Mean coervity (Bh) is given in log10 B mT and dispersion parameter (DP) in log. EC is the extrapolated contribution to the total IRM.
    Keywords: 370-C0023A; Calculated, see abstract; Chikyu; Comment; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; End member; Exp370; Hole A; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; IODP Expedition 370; J-CORES sample ID; Nankai Trough; Sample code/label; Sample ID; Site C0023
    Type: Dataset
    Format: text/tab-separated-values, 651 data points
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  • 8
    Publication Date: 2023-06-14
    Description: The dataset includes solid-phase geochemistry data of sediment cores from Site C0023 (Hole A) that was recovered during International Ocean Discovery Program (IODP) Expedition 370 in the Nankai Trough offshore Japan in the Pacific Ocean (Drilling vessel Chikyu). Site C0023 was established on 17 September 2016. Coring terminated on 3 November 2016. Algal lipid biomarker analysis was performed after Sturt et al. (2004) and HPLC-MS analyses after Becker et al. (2015). Biomarker concentrations are reported as the integrated peak area of the sum of all detected diols normalized to kg extracted sediment (PA/kg).
    Keywords: 370-C0023A; Alkenones (peak area); Chikyu; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Diols (peak area); DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Exp370; High Performance Liquid Chromatography - Mass spectrometry (HPLC-MS); Hole A; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; IODP Expedition 370; J-CORES sample ID; Nankai Trough; Sample code/label; Sample ID; Site C0023
    Type: Dataset
    Format: text/tab-separated-values, 180 data points
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  • 9
    Publication Date: 2023-07-03
    Keywords: 370-C0023A; Acetate; Chikyu; Depth, bottom/max; Depth, top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Exp370; Hole A; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; IODP Expedition 370; J-CORES sample ID; Nankai Trough; Sample code/label; Sample ID; Site C0023; δ13C, acetate
    Type: Dataset
    Format: text/tab-separated-values, 657 data points
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  • 10
    Publication Date: 2023-07-03
    Keywords: 370-C0023A; Chikyu; Depth, bottom/max; Depth, top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Exp370; Hole A; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; IODP Expedition 370; J-CORES sample ID; Nankai Trough; Sample code/label; Sample ID; Site C0023; δ13C, methane
    Type: Dataset
    Format: text/tab-separated-values, 876 data points
    Location Call Number Limitation Availability
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