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  • 2020-2024  (25)
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  • 1
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    Evidence for a regional warm bias in the Early Cretaceous TEX86 record (2020)
    Elsevier
    Details
    Publication Date: 2023-02-08
    Description: Highlights • New Early Cretaceous South Atlantic TEX86 samples and climate modelling. • Systematic differences in Cretaceous isoGDGT abundances. • Regional similarities to modern Mediterranean and Red Sea sediments. Regional TEX86-temperature calibration enables model-data congruence for OAE 1a. Abstract The Cretaceous Period (145-66 Ma) provides an opportunity to obtain insights into the adaptation of the climate system to increased atmospheric greenhouse gas concentrations. The organic paleothermometer TEX86 is one of the few proxies available for reconstructing quantitative estimates of upper ocean temperatures of this time period. Here we show that the sedimentary TEX86 signal in the Early Cretaceous North and South Atlantic shows systematic differences to other Cretaceous samples. In particular, the relative increase in the fractional abundances of the crenarchaeol isomer compared to crenarchaeol exhibits similarities with surface sediments from the modern Mediterranean and Red Sea. Dedicated climate model simulations suggest that the formation of warm and saline deep waters in the restricted North and South Atlantic may have influenced TEX86 export dynamics leading to a warm bias in reconstructed upper ocean temperatures. Applying a regional calibration from the modern Mediterranean and Red Sea to corresponding TEX86 data significantly improves the model-data fit for the Aptian Oceanic Anoxic Event 1a and the overall comparison with other temperature proxies for the Early Cretaceous. Our results demonstrate the need to consider regional and temporal changes of the TEX86-temperature relation for the reconstruction of deep-time ocean temperatures.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Format: other
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Driving mechanisms of organic carbon burial in the Early Cretaceous South Atlantic Cape Basin (DSDP Site 361) (2021)
    Copernicus Publications (EGU)
    Details
    Publication Date: 2024-02-07
    Description: Extensive black shale deposits formed in the Early Cretaceous South Atlantic, supporting the notion that this emerging ocean basin was a globally important site of organic carbon burial. The magnitude of organic carbon burial in marine basins is known to be controlled by various tectonic, oceanographic, hydrological, and climatic processes acting on different temporal and spatial scales, the nature and relative importance of which are poorly understood for the young South Atlantic. Here we present new bulk and molecular geochemical data from an Aptian–Albian sediment record recovered from the deep Cape Basin at Deep Sea Drilling Project (DSDP) Site 361, which we combine with general circulation model results to identify driving mechanisms of organic carbon burial. A multimillion-year decrease (i.e., Early Aptian–Albian) in organic carbon burial, reflected in a lithological succession of black shale, gray shale, and red beds, was caused by increasing bottom water oxygenation due to abating hydrographic restriction via South Atlantic–Southern Ocean gateways. These results emphasize basin evolution and ocean gateway development as a decisive primary control on enhanced organic carbon preservation in the Cape Basin at geological timescales (〉 1 Myr). The Early Aptian black shale sequence comprises alternations of shales with high (〉 6 %) and relatively low (∼ 3.5 %) organic carbon content of marine sources, the former being deposited during the global Oceanic Anoxic Event (OAE) 1a, as well as during repetitive intervals before and after OAE 1a. In all cases, these short-term intervals of enhanced organic carbon burial coincided with strong influxes of sediments derived from the proximal African continent, indicating closely coupled climate–land–ocean interactions. Supported by our model results, we show that fluctuations in weathering-derived nutrient input from the southern African continent, linked to changes in orbitally driven humidity and aridity, were the underlying drivers of repetitive episodes of enhanced organic carbon burial in the deep Cape Basin. These results suggest that deep marine environments of emerging ocean basins responded sensitively and directly to short-term fluctuations in riverine nutrient fluxes. We explain this relationship using the lack of wide and mature continental shelf seas that could have acted as a barrier or filter for nutrient transfer from the continent into the deep ocean.
    Type: Article , PeerReviewed
    Format: text
    Format: archive
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Organic geochemistry, carbon isotopic composition of alkanoic acids and sediment core dating from permafrost soils and river and fjord sediments the Bayelva catchment and Kongsfjord, Svalbard (2020)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Description: The dataset contains compound-specific δ13C and Δ14C isotopic composition of alkanoic acids from permafrost soils and river and fjord sediments the Bayelva catchment and Kongsfjord. These were analyzed in order to determine permafrost OC turnover timescales in the Bayelva catchment, assess export mechanisms along the flow path, and characterize the spatial dispersal and reburial of permafrost OC in Kongsfjord sediments. The sampling strategy was designed to obtain an export transect sample set covering the permafrost soil-river-ocean system. Samples were taken during several land- and ship-based campaigns. In 2007, soil samples from the Bayelva River catchment were collected from the thawed active layer in the northern foreland of the East Brøgger glacier. Leirhaugen (LH) is adjacent to the main stem of the Bayelva River (Boike et al., 2008) and permafrost ground temperatures have been monitored at this site since 1998 (Boike et al., 2018; Roth and Boike, 2001). Additional soil profiles in the catchment were sampled from Kolhaugen (KH), Upper Drainage Area (UDA), and Lower Drainage Area (LDA) as described by Rethemeyer et al. (2010). A sample of coal was also obtained from the catchment. Sediment samples from the Bayelva River (BY-R), its river mouth (WP280), and the central Kongsfjord (Station T) were obtained in 2008 using a shovel (BY-R), push cores operated by divers (WP280) or a hand-operated HAPS corer (Station T). All sediment samples were sliced into 0-1 or 0-2cm segments.
    Type: Dataset
    Format: application/zip, 4 datasets
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    DATA PANGAEA
  • 4
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    Adenosyl-BHP abundances in Vancouver Island and Black Sea total suspended POM (2021)
    PANGAEA
    Details
    Publication Date: 2023-01-30
    Description: Adenosyl-BHP abundances in Vancouver Island and Black Sea total suspended particulate matter and Cariaco sinking particulate organic matter samples were analyzed to study in situ production in oxygen minimum zones. Water column suspended particulate matter samples were obtained using McLane WTS-LV (standard configuration) in situ filtration systems from Vancouver Island fjords aboard R/V Barnes in 2007 and the Black Sea aboard R/V Knorr (cruise 172/8) in 2003. Sinking particulate organic matter was sampled in sediment traps as part of the CARIACO Ocean Time-Series Program in Cariaco Basin. Adenosyl-BHPs were analyzed in trap A (275 m water depth) and trap B (455 m water depth) for 14-day opening intervals from November 1999 through April 2000 and July 2002 through October 2002.
    Keywords: 2-methyladenosylhopane; 2-methyl adenosylhopane per unit mass particulate organic carbon; 2-methyladenosylhopane-type 2; 2-methyl adenosylhopane-type 2 per unit mass particulate organic carbon; 2-methyladenosylhopane-type 3; 2-methyl adenosylhopane-type 3 per unit mass particulate organic carbon; Adenosylhopane; Adenosylhopane per unit mass particulate organic carbon; Adenosylhopane-type 2; Adenosylhopane-type 3; Bacteriohopanepolyols; Bacteriohopanetetrol; Bacteriohopanetetrol per unit mass particulate organic carbon; British Columbia, Canada; Carbon, organic, particulate; Deer_Bay_Tofino_Inlet; DEPTH, water; Effingham_Inlet; Elevation of event; Event label; in situ production; In situ pump; ISP; KN172/8; KN172/8_2; KN172/8_7; Knorr; Latitude of event; Longitude of event; oxygen minimum zone; Ratio; Sample code/label; Station 2; Station 7
    Type: Dataset
    Format: text/tab-separated-values, 436 data points
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    DATA PANGAEA
  • 5
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    Compound-specific δ13C and Δ14C isotopic composition of alkanoic acids from permafrost soils and river and fjord sediments of the Bayelva catchment and Kongsfjord (2020)
    PANGAEA
    Details
    Publication Date: 2023-02-07
    Keywords: Accelerator mass spectrometry (AMS); Age, dated; Age, dated standard deviation; Bayelva River; Bayelva river mouth; central Kongsfjord; Comment; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Event label; HAPS; HAPS corer; Identification; Kongsfjord_BY-R; Kongsfjord_LH; Kongsfjord_Station_T; Kongsfjord_WP280; Kongsfjorden, Svalbard; Leirhaugen soil; Location; Material; PUC; Push corer; Sample code/label; Shovel; SHOVEL; SOIL; Soil profile; Type; Δ14C; Δ14C, standard deviation; δ13C; δ13C, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 251 data points
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    DATA PANGAEA
  • 6
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    Decay-corrected excess lead 210 and caesium 137 activity concentrations for sediment core WP280 (2020)
    PANGAEA
    Details
    Publication Date: 2023-02-07
    Description: Bulk sediment samples of core WP280 were dried and homogenized. Samples were measured using a HPGe planar gamma detector in air-tight containers after the radioactive equilibrium between 226Ra (used as supported 210Pb proxy) and its daughter products had been reached. The efficiency calibration was performed by a direct transfer using reference materials with mineral matrix (IAEA-385 Irish Sea sediment and CANMET DL-1a Uranium-Thorium Ore with an addition of 137Cs certified solution) measured in comparable geometries. Downcore activities of 210Pbxs data were determined for the age model of core WP280. 137Cs activity depth profiles were used for validating the age model.
    Keywords: Bayelva river mouth; Caesium-137; Caesium-137, standard deviation; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; High-purity Germanium (HPGe) detector; Kongsfjord_WP280; Kongsfjorden, Svalbard; Lead-210 excess; Lead-210 excess, standard deviation; PUC; Push corer
    Type: Dataset
    Format: text/tab-separated-values, 60 data points
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    DATA PANGAEA
  • 7
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    Organic carbon content, C/N ratio, and alkanoic acid concentrations of the Kolhaugen, Upper Drainage Area, and Lower Drainage Area soil profiles (2020)
    PANGAEA
    Details
    Publication Date: 2023-08-23
    Keywords: Average chain length; Calculated; Carbon, organic, total; Carbon/Nitrogen ratio; Carbon Preference Index; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Docosanoic acid, per unit mass total organic carbon; Dotriacontanoic acid, per unit mass total organic carbon; Event label; Gas chromatography - Flame Ionization Detection (GC-FID); Heneicosanoic acid, per unit mass total organic carbon; Hentriacontanoic acid, per unit mass total organic carbon; Heptacosanoic acid, per unit mass total organic carbon; Heptadecanoic acid, per unit mass total organic carbon; Hexacosanoic acid, per unit mass total organic carbon; Hexadecanoic acid, per unit mass total organic carbon; Hexadecenoic acid, per unit mass total organic carbon; Icosanoic acid, per unit mass total organic carbon; Identification; Kolhaugen soil; Kongsfjord_KH; Kongsfjord_LDA; Kongsfjord_UDA; Kongsfjorden, Svalbard; Location; Lower Drainage Area soil; Nonacosanoic acid, per unit mass total organic carbon; Nonadecanoic acid, per unit mass total organic carbon; Octacosanoic acid, per unit mass total organic carbon; Octadecanoic acid, per unit mass total organic carbon; Octadecenoic acid , per unit mass total organic carbon; Pentacosanoic acid, per unit mass total organic carbon; SOIL; Soil profile; Tetracosanoic acid, per unit mass total organic carbon; Triacontanoic acid, per unit mass total organic carbon; Tricosanoic acid, per unit mass total organic carbon; Type; Upper Drainage Area soil
    Type: Dataset
    Format: text/tab-separated-values, 416 data points
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    DATA PANGAEA
  • 8
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    Organic carbon content, C/N ratio, and alkanoic acid concentrations of soil (Leirhaugen), river (Bayelva), and fjord (Kongsfjord) sediments (2020)
    PANGAEA
    Details
    Publication Date: 2023-08-23
    Keywords: Average chain length; Bayelva River; Bayelva river mouth; Calculated; Carbon, organic, total; Carbon/Nitrogen ratio; Carbon Preference Index; central Kongsfjord; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Docosanoic acid, per unit mass total organic carbon; Dotriacontanoic acid, per unit mass total organic carbon; Event label; Gas chromatography - Flame Ionization Detection (GC-FID); HAPS; HAPS corer; Heneicosanoic acid, per unit mass total organic carbon; Hentriacontanoic acid, per unit mass total organic carbon; Heptacosanoic acid, per unit mass total organic carbon; Heptadecanoic acid, per unit mass total organic carbon; Hexacosanoic acid, per unit mass total organic carbon; Hexadecanoic acid, per unit mass total organic carbon; Hexadecenoic acid, per unit mass total organic carbon; Icosanoic acid, per unit mass total organic carbon; Identification; Kongsfjord_BY-R; Kongsfjord_LH; Kongsfjord_Station_T; Kongsfjord_WP280; Kongsfjorden, Svalbard; Leirhaugen soil; Location; Nonacosanoic acid, per unit mass total organic carbon; Nonadecanoic acid, per unit mass total organic carbon; Octacosanoic acid, per unit mass total organic carbon; Octadecanoic acid, per unit mass total organic carbon; Octadecenoic acid , per unit mass total organic carbon; Pentacosanoic acid, per unit mass total organic carbon; PUC; Push corer; Shovel; SHOVEL; SOIL; Soil profile; Tetracosanoic acid, per unit mass total organic carbon; Triacontanoic acid, per unit mass total organic carbon; Tricosanoic acid, per unit mass total organic carbon; Type
    Type: Dataset
    Format: text/tab-separated-values, 332 data points
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    DATA PANGAEA
  • 9
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    BHP abundances and ratio in Effingham Inlet and Deer Bay (2021)
    PANGAEA
    Details
    Publication Date: 2023-11-30
    Description: Bacteriohopanepolyol abundances and ratios were studied in suspended particulate matter obtained along the redoxcline in Effingham Inlet (lat 49.07, long −125.15; 120m water depth) and Deer Bay (lat 49.22, long −125.60; 40m water depth), Vancouver Island, to infer chemo(auto)trophy in these fjords. Water column suspended particulate matter samples were obtained from Vancouver Island fjords using McLane WTS-LV (standard configuration) in situ filtration systems aboard R/V Barnes in July 2007.
    Keywords: 2methyl-adenosylhopane; 2-methyladenosylhopane-type 2; 2methyl-adenosylhopane-type 2 per unit mass particulate organic carbon; 2-methyladenosylhopane-type 3; 2methyl-adenosylhopane-type 3 per unit mass particulate organic carbon; 2methyl-aminobacteriohopanetriol; 2methyl-aminobacteriohopanetriol per unit mass particulate organic carbon; 2methyl-bacteriohopanetetrol; 2methyl-bacteriohopanetetrol pentose; 2methyl-bacteriohopanetetrol pentose per unit mass particulate organic carbon; 2methyl-bacteriohopanetetrol per unit mass particulate organic carbon; 3methyl-aminobacteriohopanetriol; 3methyl-aminobacteriohopanetriol per unit mass particulate organic carbon; 3methyl-bacteriohopanetetrol; 3methyl-bacteriohopanetetrol per unit mass particulate organic carbon; Adenosylhopane; Adenosylhopane per unit mass particulate organic carbon; Adenosylhopane-type 2; adenosylhopane-type 2 per unit mass particulate organic carbon; Adenosylhopane-type 3; Aminobacteriohopanepentol; Aminobacteriohopanetetrol; Aminobacteriohopanetetrol per unit mass particulate organic carbon; Aminobacteriohopanetriol; Aminobacteriohopanetriol isomer; Aminobacteriohopanetriol per unit mass particulate organic carbon; Aminopentol:aminotriol; Aminotetrol:aminotriol; Anhydrobacteriohopanetetrol; Anhydrobacteriohopanetetrol per unit mass particulate organic carbon; Bacteriohopanehexol; Bacteriohopanehexol per unit mass particulate organic carbon; Bacteriohopanepolyols; Bacteriohopanepolyols, total; Bacteriohopanetetrol; Bacteriohopanetetrol cyclitol ether; Bacteriohopanetetrol cyclitol ether per unit mass particulate organic carbon; Bacteriohopanetetrol glucosamine; Bacteriohopanetetrol glucosamine per unit mass particulate organic carbon; Bacteriohopanetetrol isomer; Bacteriohopanetetrol isomer per unit mass particulate organic carbon; Bacteriohopanetetrol isomer ratio; Bacteriohopanetetrol pentose; Bacteriohopanetetrol pentose per unit mass particulate organic carbon; Bacteriohopanetetrol per unit mass particulate organic carbon; British Columbia, Canada; C16-acyl-aminobacteriohopanetriol; C16-acyl-aminobacteriohopanetriol per unit mass particulate organic carbon; Carbon, organic, particulate; Deer_Bay_Tofino_Inlet; DEPTH, water; Effingham_Inlet; Event label; In situ pump; ISP; oxygen minimum zone; redoxcline; unsaturated anhydrobacteriohopanetetrol; Unsaturated bacteriohopanetetrol pentose; Unsaturated bacteriohopanetetrol pentose, per unit mass particulate organic carbon; Vancouver Island; Volume, filter
    Type: Dataset
    Format: text/tab-separated-values, 290 data points
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    DATA PANGAEA
  • 10
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    GDGT data in Siberian permafrost deposits (2021)
    PANGAEA
    Details
    Publication Date: 2023-11-16
    Description: Core lipid GDGT distributions were studied in different North Siberian permafrost deposits to study GDGT diversity and underlying environmental controls. Samples represent various deposit types such as active layer of polygonal tundra soils, fluvial terrace/floodplain sediments, Holocene and Pleistocene thermokarst sediments, and late Pleistocene Ice Complex (Yedoma) and were obtained on Samoylov Island, Kurungnakh Island, Arga Island, Bol'shoy Lyakhovsky Island, and Buor Khaya Peninsula during several field campaigns between 2009 and 2015. Active layer samples of polygonal tundra soils and fluvial terrace/floodplain sediments were sampled using shovels, Holocene and Pleistocene thermokarst sediments and late Pleistocene Ice Complex samples were obtained using drill rigs.
    Keywords: Acyclic glycerol dialkyl glycerol tetraether; Acyclic glycerol dialkyl glycerol tetraether, per unit mass total organic carbon; Acyclic glycerol dialkyl glycerol tetraether/Crenarchaeol ratio; AG-0101; AG-0102; AG-0103; AG-0104; AG-0105; AG-0106; Arga Island; AWI Arctic Land Expedition; BK-8; Bolshoy-Lyakhovsky_Island_2014; Bolshoy Lyakhovsky Island, East Siberia, Russia; Branched and isoprenoid tetraether index; Branched glycerol dialkyl glycerol tetraether, Ia; Branched glycerol dialkyl glycerol tetraether, Ia, per unit mass total organic carbon; Branched glycerol dialkyl glycerol tetraether, Ib; Branched glycerol dialkyl glycerol tetraether, Ib, per unit mass total organic carbon; Branched glycerol dialkyl glycerol tetraether, Ic; Branched glycerol dialkyl glycerol tetraether, Ic, per unit mass total organic carbon; Branched glycerol dialkyl glycerol tetraether, IIa; Branched glycerol dialkyl glycerol tetraether, IIa, per unit mass total organic carbon; Branched glycerol dialkyl glycerol tetraether, IIa'; Branched glycerol dialkyl glycerol tetraether, IIb; Branched glycerol dialkyl glycerol tetraether, IIb, per unit mass total organic carbon; Branched glycerol dialkyl glycerol tetraether, IIb'; Branched glycerol dialkyl glycerol tetraether, IIb', per unit mass total organic carbon; Branched glycerol dialkyl glycerol tetraether, IIc; Branched glycerol dialkyl glycerol tetraether, IIc, per unit mass total organic carbon; Branched glycerol dialkyl glycerol tetraether, IIc'; Branched glycerol dialkyl glycerol tetraether, IIc', per unit mass total organic carbon; Branched glycerol dialkyl glycerol tetraether, IIIa; Branched glycerol dialkyl glycerol tetraether, IIIa, per unit mass total organic carbon; Branched glycerol dialkyl glycerol tetraether, IIIa'; Branched glycerol dialkyl glycerol tetraether, IIIa', per unit mass total organic carbon; Branched glycerol dialkyl glycerol tetraether, IIIb; Branched glycerol dialkyl glycerol tetraether, IIIb, per unit mass total organic carbon; Branched glycerol dialkyl glycerol tetraether, IIIb'; Branched glycerol dialkyl glycerol tetraether, IIIb', per unit mass total organic carbon; Branched glycerol dialkyl glycerol tetraether, IIIc; Branched glycerol dialkyl glycerol tetraether, IIIc, per unit mass total organic carbon; Branched glycerol dialkyl glycerol tetraether, IIIc'; Branched glycerol dialkyl glycerol tetraether, IIIc', per unit mass total organic carbon; Branched glycerol dialkyl glycerol tetraether, Ila', per unit mass total organic carbon; Buor-Khaya Bay, Laptev Sea Coast, Russia; Carbon, organic, total; Crenarchaeol; Crenarchaeol, per unit mass total organic carbon; Crenarchaeol isomer; Crenarchaeol isomer, per unit mass total organic carbon; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Dicyclic glycerol dialkyl glycerol tetraether; Dicyclic glycerol dialkyl glycerol tetraether, per unit mass total organic carbon; Dicyclic glycerol dialkyl glycerol tetraether/Crenarchaeol ratio; Elevation of event; Event label; GDGTs; KUB-C; KUB-R; KUC-15; Kurungnakh Island; KUU-C; KUU-R; L14-02; L14-03; L14-04; L14-05; LAND; Latitude of event; Lena2011; Longitude of event; Monocyclic glycerol dialkyl glycerol tetraether; Monocyclic glycerol dialkyl glycerol tetraether, per unit mass total organic carbon; Nitrogen; Permafrost; pH; RCD; Reference/source; Rotary core drilling; RU-Land_2011_Lena; RU-Land_2014_BolshoyLyakhovsky; SA-C; SA-K; Samoylov Island; Sampling/measurement on land; Sampling date; SA-R; Siberian Arctic; Tricyclic glycerol dialkyl glycerol tetraether; Tricyclic glycerol dialkyl glycerol tetraether, per unit mass total organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 6551 data points
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