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  • 2020-2024  (11)
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  • 1
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    Deglacial upslope shift of NE Atlantic intermediate waters controlled slope erosion and cold-water coral mound formation (Porcupine Seabight, Irish margin) (2020)
    Elsevier
    Details
    Publication Date: 2023-02-08
    Description: Highlights • Holocene cold-water coral mound formation started non-synchronous in Belgica province. • Coral mounds and slope sediments record changes in intermediate water mass dynamics. • Increased turbulent bottom currents steered slope erosion and mound formation. • Internal waves at the ENAW-MOW boundary enhance energy supply and particle flux. • Transition zone between the ENAW-MOW shifted 250 m upslope during the last deglacial. Abstract Turbulent bottom currents significantly influence the formation of cold-water coral mounds and sedimentation processes on continental slopes. Combining records from coral mounds and adjacent slope sediments therefore provide an unprecedented palaeo-archive to understand past variations of intermediate water-mass dynamics. Here, we present coral ages from coral mounds of the Belgica province (Porcupine Seabight, NE Atlantic), which indicate a non-synchronous Holocene re-activation in mound formation suggested by a temporal offset of ∼2.7 kyr between the deep (start: ∼11.3 ka BP at 950 m depth) and shallow (start: ∼8.6 ka BP at 700 m depth) mounds. A similar depth-dependent pattern is revealed in the slope sediments close to these mounds that become progressively younger from 22.1 ka BP at 990 m to 12.2 ka BP at 740 m depth (based on core-top ages). We suggest that the observed changes are the consequence of enhanced bottom-water hydrodynamics, caused by internal waves associated to the re-invigoration of the Mediterranean Outflow Water (MOW) and the development of a transition zone (TZ) between the MOW and the overlying Eastern North Atlantic Water (ENAW), which established during the last deglacial. These highly energetic conditions induced erosion adjacent to the Belgica mounds and supported the re-initiation of mound formation by increasing food and sediment fluxes. The striking depth-dependent patterns are likely linked to a shift of the ENAW-MOW-TZ, moving the level of maximum energy ∼250 m upslope since the onset of the last deglaciation.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Isotopic characterization of water masses in the Southeast Pacific region: Paleoceanographic implications (2022)
    AGU (American Geophysical Union) | Wiley
    Details
    Publication Date: 2024-02-07
    Description: In this study, we used stable isotopes of oxygen (δ18O), deuterium (δD), and dissolved inorganic carbon (δ13CDIC) in combination with temperature, salinity, oxygen and nutrient concentrations to characterize the coastal (71-78 °W) and an oceanic (82-98 °W) water masses (SAAW-Subantarctic Surface Water; STW-Subtropical Water; ESSW-Equatorial Subsurface water; AAIW-Antarctic Intermediate Water; PDW-Pacific Deep Water) of the Southeast Pacific (SEP). The results show that δ18O and δD can be used to differentiate between SAAW-STW, SAAW-ESSW and ESSW-AAIW. δ13CDIC signatures can be used to differentiate between STW-ESSW (oceanic section), SAAW-ESSW, ESSW-AAIW and AAIW-PDW. Compared with the oceanic section, our new coastal section highlights differences in both the chemistry and geometry of water masses above 1000 m. Previous paleoceanographic studies using marine sediments from the SEP continental margin used the present-day hydrological oceanic transect to compare against, as the coastal section was not sufficiently characterized. We suggest that our new results of the coastal section should be used for past characterizations of the SEP water masses that are usually based on continental margin sediment samples.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Isotopic Characterization of Water Masses in the Southeast Pacific Region: Paleoceanographic Implications (2022)
    American Geophysical Union (AGU)
    In:  EPIC3Journal of Geophysical Research - Oceans, American Geophysical Union (AGU), 127(1), ISSN: 2169-9275
    Details
    Publication Date: 2024-01-31
    Description: In this study, we used stable isotopes of oxygen (δ18O), deuterium (δD), and dissolved inorganic carbon (δ13CDIC) in combination with temperature, salinity, oxygen, and nutrient concentrations to characterize the coastal (71°–78°W) and an oceanic (82°–98°W) water masses (SAAW—Subantarctic Surface Water; STW—Subtropical Water; ESSW—Equatorial Subsurface water; AAIW—Antarctic Intermediate Water; PDW—Pacific Deep Water) of the Southeast Pacific (SEP). The results show that δ18O and δD can be used to differentiate between SAAW-STW, SAAW-ESSW, and ESSW-AAIW. δ13CDIC signatures can be used to differentiate between STW-ESSW (oceanic section), SAAW-ESSW, ESSW-AAIW, and AAIW-PDW. Compared with the oceanic section, our new coastal section highlights differences in both the chemistry and geometry of water masses above 1,000 m. Previous paleoceanographic studies using marine sediments from the SEP continental margin used the present-day hydrological oceanic transect to compare against, as the coastal section was not sufficiently characterized. We suggest that our new results of the coastal section should be used for past characterizations of the SEP water masses that are usually based on continental margin sediment samples.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
    Format: application/pdf
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    PAPER (OA)
  • 4
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    Geochemical, sedimentological and micropaleontological analysis of the 9.2 m long, radiocarbon-dated (last 16.8 kyr) LAR sediment core from Larenas Bay (48°S; Chile) (2021)
    PANGAEA
    Details
    Publication Date: 2023-10-14
    Description: We performed geochemical, sedimentological and micropaleontological analyses on a 9.2 m long radiocarbon-dated sediment core collected from Larenas Bay (48°S; Chile) to reconstruct basin isolation and marine ingression over the last 16.8 kyr. The LAR sediment core was collected with a 5 m long Uwitec piston corer (63 mm diameter) onboard the R/V Gran Campo II on September 12th 2008. Two overlapping ~4.6 m long piston cores (LAR I and LAR II) and a 65 cm long gravity core that preserved the sediment-water interface were retrieved. To investigate modern sediments, the top centimeter of an additional Rumohr gravity core (LAR R2) taken at the same location on January 19th 2020 was used. The piston cores were sampled in 2 cm thick slices which were subsequently freeze-dried. Discrete analyses were performed at a 10 to 20 cm interval. A separate set of 1 cm thick samples was used for density measurements.
    Keywords: Alkenones; Baker-Martínez fjord system; biogenic silica; Bulk organic geochemistry; Calcium Carbonate; Chilean Patagonia; density; Diatoms; Grain Size; Holocene; Late Glacial; magnetic susceptibility; stable carbon isotopes
    Type: Dataset
    Format: application/zip, 5 datasets
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    DATA PANGAEA
  • 5
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    Geochemical, sedimentological and micropaleontological data of the LAR sediment core (2021)
    PANGAEA
    Details
    Publication Date: 2023-10-14
    Description: Bulk organic geochemistry, stable carbon isotopes, biogenic opal, calcium carbonate, geometric mean grain size, C37 alkenones, and freshwater vs. marine diatoms analyzed at a 10 to 20 cm interval.
    Keywords: AGE; Alkenone, C37; Alkenones; Baker-Martínez fjord system; biogenic silica; Bulk organic geochemistry; Calcium carbonate; Calcium Carbonate; Calculated; Calendar age; Carbon, organic, total; Chilean Patagonia; COMPCORE; Composite Core; density; Depth, composite; Diatoms; Diatoms, freshwater; Diatoms, marine; Grain Size; Grain size, mean; Holocene; LAR; LAR_GC_PC; Larenas Bay, Baker-Martínez fjord system, Chile; Late Glacial; Lithogenic material; magnetic susceptibility; Opal, biogenic silica; Sample ID; stable carbon isotopes; δ13C
    Type: Dataset
    Format: text/tab-separated-values, 1023 data points
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    DATA PANGAEA
  • 6
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    Magnetic susceptibility of the LAR sediment core (2021)
    PANGAEA
    Details
    Publication Date: 2023-10-14
    Description: Continuous high-resolution logging of magnetic susceptibility was accomplished using a Bartington MS2E spot sensor integrated into an automatic logging system. Measurements were performed on the split cores in steps of 1 mm with drift correction every 10 mm using readings in air. The gravity and piston cores were correlated using the magnetic susceptibility data, resulting in a composite core length of 9.20 m.
    Keywords: Alkenones; Baker-Martínez fjord system; Bartington MS2E point sensor; biogenic silica; Bulk organic geochemistry; Calcium Carbonate; Chilean Patagonia; COMPCORE; Composite Core; density; Depth, composite; Diatoms; Grain Size; Holocene; LAR; LAR_GC_PC; Larenas Bay, Baker-Martínez fjord system, Chile; Late Glacial; magnetic susceptibility; Magnetic susceptibility, volume; stable carbon isotopes
    Type: Dataset
    Format: text/tab-separated-values, 17862 data points
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    DATA PANGAEA
  • 7
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    Density data of the LAR sediment core (2021)
    PANGAEA
    Details
    Publication Date: 2023-10-14
    Description: Wet and dry bulk density were measured on 1 cm thick slices (2.9 ± 0.7 cm3) every 20 cm.
    Keywords: Alkenones; Baker-Martínez fjord system; biogenic silica; Bulk organic geochemistry; Calcium Carbonate; Chilean Patagonia; COMPCORE; Composite Core; density; Density, dry bulk; Density, wet bulk; Depth, composite; Diatoms; Grain Size; Holocene; LAR; LAR_GC_PC; Larenas Bay, Baker-Martínez fjord system, Chile; Late Glacial; magnetic susceptibility; Measured; Sample ID; stable carbon isotopes
    Type: Dataset
    Format: text/tab-separated-values, 187 data points
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    DATA PANGAEA
  • 8
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    Mean ages calculated by the bayesian age-depth model (2021)
    PANGAEA
    Details
    Publication Date: 2023-10-14
    Description: The age model of the LAR sediment core was produced with the BACON 2.4.3 software, using 11 radiocarbon ages. The table contains the mean age of the sediment at a 1mm resolution.
    Keywords: Age model; Alkenones; BACON age modeling; Baker-Martínez fjord system; biogenic silica; Bulk organic geochemistry; Calcium Carbonate; Chilean Patagonia; COMPCORE; Composite Core; density; Depth, composite; Diatoms; Grain Size; Holocene; LAR; LAR_GC_PC; Larenas Bay, Baker-Martínez fjord system, Chile; Late Glacial; magnetic susceptibility; stable carbon isotopes
    Type: Dataset
    Format: text/tab-separated-values, 18402 data points
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    DATA PANGAEA
  • 9
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    Fractions of lithogenic particles 〉63 µm and 〉150 µm of the LAR sediment core (2021)
    PANGAEA
    Details
    Publication Date: 2023-10-14
    Description: The lithogenic fractions 〉63 µm and 〉150 µm were separated through wet-sieving. Five (30.5 – 680.5 cm) or 10 g (680.5 – 910.5 cm) of freeze-dried sediment was used for analysis. Organic matter was removed through loss-on-ignition by heating the samples in a muffle furnace at 750 °C for four hours. Inorganic carbon and biogenic silica were removed with acetic acid (5 mL, 100%) and boiling NaOH (5 mL, 2N), respectively. Results are presented in dry weight percentages.
    Keywords: Alkenones; Baker-Martínez fjord system; biogenic silica; Bulk organic geochemistry; Calcium Carbonate; Chilean Patagonia; COMPCORE; Composite Core; density; Depth, composite; Diatoms; Grain Size; Holocene; LAR; LAR_GC_PC; Larenas Bay, Baker-Martínez fjord system, Chile; Late Glacial; magnetic susceptibility; Sample ID; see description in data abstract; Size fraction 〉 0.063 mm, sand; Size fraction 〉 0.150 mm; stable carbon isotopes
    Type: Dataset
    Format: text/tab-separated-values, 356 data points
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    DATA PANGAEA
  • 10
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    Marine fossil radiocarbon (14C) compilation up to 2021 (2022)
    PANGAEA
    Details
    Publication Date: 2024-05-28
    Description: This dataset includes a global compilation of new and published 14C measurements of benthic foraminifera and deep-sea corals (from 0-to 49872 years BP). We synthesized this new dataset into basin-average 14C ventilation age values over the 25,000 years, along density surfaces associated with the upper and lower cells of global ocean overturning circulation (27.5 and 28 kg m^-3, respectively). The published datasets are from all ocean basins, even those not utilized in our synthesis. We also provide the basin-average estimates for the Atlantic, Southern, and Pacific Oceans as produced by the Rafter et al. 2022 study.
    Keywords: 0050PG; 0066PG; 145-883; 145-887; 146-893A; 167-1019A; 202-1240; 202-1242A; 341-U1419; 35MF20120125, OISO_21, INDIEN SUD 2; 47396B; 50-37KL; 64-480; 90b; AII125-8-55; AII125-8-56; Akademik M.A. Lavrentiev; ALV-3887-1549-004-007; ALV-3887-1549-004-009; ALV-3887-1549-004-012; ALV-3890-1407-003-001; ALV-3891-1459-003-002; ALV-3891-1758-006-003; AMOCINT, IMAGES XVII; ANT-XI/4; ANT-XXIII/9; ANT-XXVI/2; Argentine Basin; ARK-II/5; ARK-X/2; Azores; B34-91; BC; Bering Sea; Binary Object; BO04-PC11; Box corer; Brazil Basin; Burdwood_Bank; CALYPSO; CALYPSO2; Calypso Corer; Calypso Corer II; Calypso square corer; Calypso Square Core System; Canarias Sea; Cape_Horn; Caribbean Sea; CASQ; CASQS; CD159; CD159-10; CD159-15; CD159-17; CD38-17P; Celtic Sea; Cenderawasih Bay; Central Pacific; CH84-14; Charles Darwin; CHAT_10k; CHAT_16k; CHAT-3K; CHAT-5K; Chatham Rise; COMPCORE; Composite Core; Conrad Rise; Core; CORE; Core1471; Core2088; Core21210009; Core2307; Core2631; Core2657; Core2706; Core2774; Core47396; Core654; Core660; Core936; Corner Rise; Denmark Strait; Drake Passage; DRILL; Drilling/drill rig; Eastern Equatorial Pacific; Eastern slope of Kurile Basin; East Pacific; Emperor Seamounts; EN06601; EN066-39GGC; Endeavor; Equatorial East Pacific; ESTASE1; EW0408; EW0408-26JC; EW0408-85JC; EW0408-87JC; Exp341; F2-92-P3; F8-90-G21; File content; Galapagos; Galápagos Islands; GC; GC_POI; GeoB1503-1; GeoB2104-3; GeoB7149-2; GeoB7162-6; GeoB7163-7; GeoB7167-6; GGC; GGC5; gh02-1030; Giant box corer; Giant gravity corer; Giant piston corer; GIK17940-1; GIK23243-2 PS05/431; GKG; Glomar Challenger; GPC; Gravity corer; Gravity corer (Kiel type); Gravity corer (POI); GS07-150-17/1GC-A; GS07-150-20/2A; Gulf of Alaska; Gulf of California; H209; H213; HH12-946MC; HU72-021-7; HU89038-8PC; IMAGES III - IPHIS; IMAGES IV-IPHIS III; IMAGES V; IMAGES VIII - MONA; IMAGES VII - WEPAMA; IMAGES XII - MARCO POLO; IMAGES XV - Pachiderme; Indian Ocean; INOPEX; Interim_Seamount; Japan Trench; Jean Charcot; JM-FI-19PC; Joides Resolution; JPC; JPC30; JT96-09; JT96-09PC; Jumbo Piston Core; KAL; KALMAR II; Kasten corer; KL; KN_USA; KN11002; KN159-5; Knorr; KNR073-04-003; KNR110-50; KNR110-66; KNR110-82a; KNR110-82GGC; KNR140; KNR140-01JPC; KNR140-02JPC; KNR140-12JPC; KNR140-2-12JPC; KNR140-2-22JPC; KNR140-22JPC; KNR140-2-30GGC; KNR140-2-51GGC; KNR140-26GGC; KNR140-30GGC; KNR140-37JPC; KNR140-39GGC; KNR140-43GGC; KNR140-50GGC; KNR140-51GGC; KNR140-56GGC; KNR140-66GGC; KNR159-5; KNR159-5-36GGC; KNR159-5-78GGC; KNR176-17GC; KNR178; KNR178-2GGC; KNR178-32JPC; KNR195-5-CDH23; KNR195-5-CDH26; KNR195-5-CDH41; KNR195-5-GGC43; KNR197-10; KNR197-10CDH42; KNR197-10-CDH42; KNR197-10-CDH46; KNR197-10-GGC17; KNR197-10-GGC36; KNR197-10-GGC5; KNR198-CDH36; KNR198-GGC15; KNR31GPC5; KNR733P; KNR734P; KNR736P; KOL; KOMEX; KOMEX II; KR02-15-PC06; Kronotsky Peninsula; KT89-18-P4; Lakshadweep Sea; Laurentian fan; Leg145; Leg146; Leg167; Leg202; Leg64; Le Suroît; LPAZ21P; LV27/GREGORY; LV27-2-4; LV29-114-3; LV29-2; M16/2; M23/2; Marion Dufresne (1972); Marion Dufresne (1995); Maurice Ewing; Mazatlan; MCSEIS; MD012378; MD01-2378; MD012386; MD01-2386; MD012416; MD01-2416; MD012420; MD01-2420; MD022489; MD02-2489; MD022519; MD02-2519; MD03-2697; MD03-2707; MD052896; MD05-2896; MD052904; MD05-2904; MD07-3076; MD07-3076Q; MD07-3088; MD08-3169; MD08-3180; MD09-3256; MD09-3256Q; MD09-3257; MD106; MD111; MD114; MD122; MD12-3396Cq; MD126; MD13; MD134; MD147; MD159; MD168; MD173; MD189; MD77-176; MD972106; MD97-2106; MD972120; MD97-2120; MD972121; MD97-2121; MD972138; MD97-2138; MD982165; MD98-2165; MD982181; MD98-2181; MD99-2334; ME0005A; ME0005A-24JC; ME0005A-43JC; Melville; Meteor (1986); ML1208-01PC; MONITOR MONSUN; MR01-K03; MR06-04_PC04A; MUC; Multichannel seismics; MultiCorer; MV99-GC38; MV99-MC17/GC32/PC10; MV99-MC19/GC31/PC08; NEMO; Nesmeyanov25-1-GGC15; Nesmeyanov25-1-GGC18; Nesmeyanov25-1-GGC20; Nesmeyanov25-1-GGC27; New_England_Seamounts; North Atlantic; North Greenland Sea; North Pacific/Gulf of California/BASIN; North Pacific Ocean; Northwest Atlantic; Norwegian Sea; OCE326-GGC14; OCE326-GGC26; OCE326-GGC5; off Chile; off Nova Scotia; OSIRIS III; Pacific Ocean; PALEOCINAT; PC; Philippine Sea; PICABIA; Piston corer; Piston corer (BGR type); Piston corer (Kiel type); PLDS-007G; PLDS-1; Pleiades; Polarstern; PS05; PS1243-2; PS2606-6; PS2644-2; PS30; PS30/144; PS31; PS31/160; PS69; PS69/907-2; PS69/912-3; PS69/912-4; PS75/059-2; PS75/100-4; PS75/104-1; PS75 BIPOMAC; PUCK; RAPiD-10-1P; RAPiD-15-4P; RAPiD-17-5P; RBDASS05; RC24; RC24-8GC; RC27; RC27-14; RC27-23; Remote operated vehicle; RETRO-2; RNDB-GGC15; RNDB-GGC5; RNDB-PC11; RNDB-PC13; Robert Conrad; ROV; RR0503-36JPC; RR0503-41JPC; RR0503-64JPC; RR0503-79JPC; RR0503-831C; RR0503-83GC; S67-FFC15; S794; S931; Sakhalin shelf and slope; Sars_Seamount; Scotia Sea; Sea of Okhotsk; SEDCO; Sediment corer; Shackleton_Fracture_Zone; SHAK03-6K; SHAK05-3K; SHAK06-4K; SHAK06-5K; SHAK10-10K; SHAK14-4G; Shirshov Ridge; SK129-CR2; SL; Smithsonian_48735.1; SO156/2; SO156/3; SO161/3; SO161/3_22; SO178; SO178-13-6; SO201/2; SO201-2-101; SO201-2-12KL; SO201-2-77; SO201-2-85; SO202/1; SO202/1_18-6; SO213/2; SO213/2_76-2; SO213/2_79-2; SO213/2_82-1; SO213/2_84-1; SO95; Sonne; SOPATRA; South Atlantic; South Atlantic Ocean; South China Sea; Southern Alaska Margin: Tectonics, Climate and Sedimentation; South of Iceland; South Pacific Ocean; South Tasman Rise; Southwest Pacific Ocean; SPOC; Station 6, MD189-3396; SU90-08; Thomas G. Thompson (1964); Thomas Washington; Timor Sea; TNO57-21; TR163-22; TR163-23; TR163-31; TT154-10; TTN13-18; TTXXX; U938; V34; V34-98; V35; V35-5; V35-6; Vema; Vigo; VINO19-4-GGC17; VINO19-4-GGC37; VM21-29; VM21-30; VM23-81; VM28-122; VM28-238; VNTR01; VNTR01-10GC; W8709A; W8709A-13; Wecoma
    Type: Dataset
    Format: text/tab-separated-values, 8 data points
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