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  • PANGAEA  (244,381)
  • Institute of Physics  (212,939)
  • 2005-2009  (315,542)
  • 2000-2004  (141,778)
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  • 1
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    Mapping of the Eltanin impact area in the South-East Pacific (2006)
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Details
    Publication Date: 2024-06-26
    Description: Two Polarstern expeditions were conducted in 1995 (ANT-XII/4) and 2001 (ANT-XVIII/5a) to the Bellingshausen Sea and Amundsen Sea and the suspected Eltanin meteorite impact in the SE-Pacific. A survey of the sediment distribution and its acoustic structure along the cruise track was performed. The seafloor topography was sampled using the multibeam sonar system Hydrosweep DS2 which operates on a frequency of 15.5 kHz. The resulting AWI Bathymetric Chart of the Eltanin Meteorite Impact Area is based on a Digital Terrain Model of this area. The mapping was performed using ArcGIS. The Eltanin impact area which covers the 4.100 m high Freden Seamount is visualized by one overview sheet of the scale 1:200,000 and four 1:100,000 subsheets.
    Keywords: ANT-XII/4; AWI_Paleo; Eltanin-impact-area; Eltanin Meteorite Impact Area, Freeden Seamount, SE-Pacific; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS35 06AQANTXII_4
    Type: Dataset
    Format: application/zip, 6 datasets
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    DATA PANGAEA
  • 2
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    Unknown
    Standard meteorological measurements on board of POLARSTERN during expedition ANT-IV (PS08, 4 cruises, south summer 1985/86) in the Atlantic and Weddell Sea, Antarctica (2006)
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Details
    Publication Date: 2024-06-26
    Description: During the fourth Antarctic voyage ANT-IV of the research icebreaker POLARSTERN standard meteorological measurements have been performed. The measurements include 3-hourly synoptic observations as well as daily upper air soundings. The measurements started on September 6 1985 at Bremerhaven and were terminated at April 28 1986 in Punta Arenas. The 3-hourly synoptic observations are performed following the instructions of the FM 13 ships code defined by the World Meteorological Organization (WMO). The datasets include automatic measurements such as mean ship's speed, wind velocity, wind direction, air temperature, water temperature as well as visual observations such as total cloud amount, present weather, clouds, height and period of swell waves, ice classification. The visual observation are not performed during night time. For the upper air soundings VAISALA RS80 radiosondes, carried by helium-filled balloons (TOTEX 350 - 1500) were used. Data reception and evaluation were carried out by a MicroCora System (VAISALA). The upper air soundings include profile measurements of pressure, temperature, relative humidity and wind vector. Usually the soundings started at the heliport (10 m above sea level) and terminated between 15 and 37 km. The height of the measurements was calculated by applying the barometric formula. The wind vector was determined with the aid of the OMEGA navigation system.
    Keywords: ANT-IV/1a; ANT-IV/1b; ANT-IV/1c; ANT-IV/2; ANT-IV/3; ANT-IV/4; AWI_Meteo; Canarias Sea; CT; Meteorological Long-Term Observations @ AWI; North Atlantic Ocean; North Sea; Polarstern; PS08; PS08/01331; PS08/01332; PS08/01333; PS08/01334; PS08/01335; PS08/01336; PS08/01337; PS08/01338; PS08/01339; PS08/01340; PS08/01341; PS08/01342; PS08/01343; PS08/01344; PS08/01345; PS08/01346; PS08/01347; PS08/01348; PS08/01349; PS08/01350; PS08/01351; PS08/01352; PS08/01353; PS08/01354; PS08/01355; PS08/01356; PS08/01357; PS08/01358; PS08/01359; PS08/01360; PS08/01361; PS08/01362; PS08/01363; PS08/01364; PS08/01365; PS08/01366; PS08/01367; PS08/01368; PS08/01369; PS08/01370; PS08/01371; PS08/01372; PS08/01373; PS08/01374; PS08/01375; PS08/01376; PS08/01377; PS08/01378; PS08/01379; PS08/01380; PS08/01381; PS08/01382; PS08/01383; PS08/01384; PS08/01385; PS08/01386; PS08/01387; PS08/01388; PS08/01389; PS08/01390; PS08/01391; PS08/01392; PS08/01393; PS08/01394; PS08/01395; PS08/01396; PS08/01397; PS08/01398; PS08/01399; PS08/01400; PS08/01401; PS08/01402; PS08/01403; PS08/01404; PS08/01405; PS08/01414; PS08/01415; PS08/01416; PS08/01417; PS08/01418; PS08/01419; PS08/01420; PS08/01421; PS08/01422; PS08/01423; PS08/01424; PS08/01425; PS08/01426; PS08/01427; PS08/01428; PS08/01429; PS08/01430; PS08/01431; PS08/01432; PS08/01433; PS08/01434; PS08/01435; PS08/01436; PS08/01437; PS08/01438; PS08/01439; PS08/01440; PS08/01441; PS08/01442; PS08/01443; PS08/01444; PS08/01445; PS08/01446; PS08/01447; PS08/01448; PS08/01449; PS08/01450; PS08/01451; PS08/01452; PS08/01453; PS08/01454; PS08/01455; PS08/01456; PS08/01457; PS08/01458; PS08/01459; PS08/01460; PS08/01461; PS08/01462; PS08/01463; PS08/01464; PS08/01465; PS08/01466; PS08/01467; PS08/01468; PS08/01469; PS08/01470; PS08/01471; PS08/01472; PS08/01473; PS08/01474; PS08/01475; PS08/01476; PS08/01477; PS08/01478; PS08/01479; PS08/01480; PS08/01481; PS08/01482; PS08/01483; PS08/01484; PS08/01485; PS08/01486; PS08/01487; PS08/01488; PS08/01489; PS08/01490; PS08/01491; PS08/01492; PS08/01493; PS08/01494; PS08/01495; PS08/01496; PS08/01497; PS08/01498; PS08/01499; PS08/01500; PS08/01501; PS08/01502; PS08/01503; PS08/01504; PS08/01505; PS08/01506; PS08/01507; PS08/01508; PS08/01509; PS08/01510; PS08/01511; PS08/01512; PS08/01513; PS08/01514; PS08/01515; PS08/01516; PS08/01517; PS08/01518; PS08/01519; PS08/01520; PS08/01521; PS08/01522; PS08/01523; PS08/1a-track; PS08/1b-track; PS08/1c-track; PS08/2-track; PS08/3-track; PS08/4-track; PS08 NOAMP; RADIO; Radiosonde; South Atlantic Ocean; Underway cruise track measurements
    Type: Dataset
    Format: application/zip, 191 datasets
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    DATA PANGAEA
  • 3
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    Geochemistry and age models of sediments from the Celtic margin (2002)
    PANGAEA
    In:  Supplement to: Auffret, Gérard A; Zaragosi, Sebastien; Dennielou, Bernard; Cortijo, Elsa; Van Rooij, David; Grousset, Francis E; Pujol, Claude; Eynaud, Frédérique; Siegert, Martin J (2002): Terrigenous fluxes at the Celtic Margin during the last glacial cycle. Marine Geology, 188(1-2), 79-108, https://doi.org/10.1016/S0025-3227(02)00276-1
    Details
    Publication Date: 2024-06-26
    Description: The sedimentary sections of three cores from the Celtic margin provide high-resolution records of the terrigenous fluxes during the last glacial cycle. A total of 21 14C AMS dates allow us to define age models with a resolution better than 100 yr during critical periods such as Heinrich events 1 and 2. Maximum sedimentary fluxes occurred at the Meriadzek Terrace site during the Last Glacial Maximum (LGM). Detailed X-ray imagery of core MD95-2002 from the Meriadzek Terrace shows no sedimentary structures suggestive of either deposition from high-density turbidity currents or significant erosion. Two paroxysmal terrigenous flux episodes have been identified. The first occurred after the deposition of Heinrich event 2 Canadian ice-rafted debris (IRD) and includes IRD from European sources. We suggest that the second represents an episode of deposition from turbid plumes, which precedes IRD deposition associated with Heinrich event 1. At the end of marine isotopic stage 2 (MIS 2) and the beginning of MIS 1 the highest fluxes are recorded on the Whittard Ridge where they correspond to deposition from turbidity current overflows. Canadian icebergs have rafted debris at the Celtic margin during Heinrich events 1, 2, 4 and 5. The high-resolution records of Heinrich events 1 and 2 show that in both cases the arrival of the Canadian icebergs was preceded by a European ice rafting precursor event, which took place about 1–1.5 kyr before. Two rafting episodes of European IRD also occurred immediately after Heinrich event 2 and just before Heinrich event 1. The terrigenous fluxes recorded in core MD95-2002 during the LGM are the highest reported at hemipelagic sites from the northwestern European margin. The magnitude of the Canadian IRD fluxes at Meriadzek Terrace is similar to those from oceanic sites.
    Keywords: CALYPSO; Calypso Corer; Celtic Shelf; CH-NKS12; IMAGES; IMAGES I; International Marine Global Change Study; Marion Dufresne (1995); MD101; MD952002; MD95-2002; Meriadzec; NO-MKS03; PC; Piston corer
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 4
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    Unknown
    Grain size composition of sediment cores from the Weddell Sea, Antarctica (2002)
    PANGAEA
    In:  Supplement to: Michels, Klaus; Kuhn, Gerhard; Hillenbrand, Claus-Dieter; Diekmann, Bernhard; Fütterer, Dieter K; Grobe, Hannes; Uenzelmann-Neben, Gabriele (2002): The southern Weddell Sea: combined contourite-turbidite sedimentation at the southeastern margin of the Weddell Gyre. In: Stow, D A V; Pudsey, C; Howe, J C; Faugères, J-C & Viana, A R (eds.), Deep-water contourite systems: modern drifts and ancient series, seismic and sedimentary characteristics. Geological Society of London, Memoirs, London, 22, 305-323, hdl:10013/epic.14690.d001
    Details
    Publication Date: 2024-06-26
    Description: Sedimentary processes in the southeastern Weddell Sea are influenced by glacial-interglacial ice-shelf dynamics and the cyclonic circulation of the Weddell Gyre, which affects all water masses down to the sea floor. Significantly increased sedimentation rates occur during glacial stages, when ice sheets advance to the shelf edge and trigger gravitational sediment transport to the deep sea. Downslope transport on the Crary Fan and off Dronning Maud and Coats Land is channelized into three huge channel systems, which originate on the eastern-, the central and the western Crary Fan. They gradually turn from a northerly direction eastward until they follow a course parallel to the continental slope. All channels show strongly asymmetric cross sections with well-developed levees on their northwestern sides, forming wedge-shaped sediment bodies. They level off very gently. Levees on the southeastern sides are small, if present at all. This characteristic morphology likely results from the process of combined turbidite-contourite deposition. Strong thermohaline currents of the Weddell Gyre entrain particles from turbidity-current suspensions, which flow down the channels, and carry them westward out of the channel where they settle on a surface gently dipping away from the channel. These sediments are intercalated with overbank deposits of high-energy and high-volume turbidity currents, which preferentially flood the left of the channels (looking downchannel) as a result of Coriolis force. In the distal setting of the easternmost channel-levee complex, where thermohaline currents are directed northeastward as a result of a recirculation of water masses from the Enderby Basin, the setting and the internal structures of a wedge-shaped sediment body indicate a contourite drift rather than a channel levee. Dating of the sediments reveals that the levees in their present form started to develop with a late Miocene cooling event, which caused an expansion of the East Antarctic Ice Sheet and an invigoration of thermohaline current activity.
    Keywords: ANT-IV/3; ANT-VI/3; ANT-VIII/5; AWI_Paleo; Camp Norway; gcmd1; Giant box corer; GKG; Gravity corer (Kiel type); Halley Bay; KL; Lyddan Island; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Piston corer (BGR type); Polarstern; PS08; PS08/333; PS12; PS12/319; PS12/340; PS12/458; PS1367-2; PS1599-1; PS1599-3; PS16; PS16/409; PS16/410; PS16/419; PS1607-3; PS1635-1; PS1789-1; PS1790-1; PS1794-2; SL; Weddell Sea
    Type: Dataset
    Format: application/zip, 13 datasets
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    DATA PANGAEA
  • 5
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    Clay minerals in the Norwegian Sea and Fram Strait, investigation from sediment traps and cores (2006)
    PANGAEA
    In:  Supplement to: Berner, Heinrich (1991): Mechanismen der Sedimentbildung in der Framstrasse, im Arktischen Ozean und in der Norwegischen See. Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen, 20, 167 pp, urn:nbn:de:gbv:46-ep000106655
    Details
    Publication Date: 2024-06-26
    Description: The grain size distribution and clay mineral composition of lithogenic particles of ice-rafted material, sinking matter, surface sediments, as well as from deep-sea cores are analysed. The samples were collected in the Fram Strait, the Arctic Ocean, and the Norwegian Sea during several expeditions with the research vessels "Polarstern", "Meteor" and "Poseidon", and Norwegian rearch vessels. Sinking matter was caught with sediment traps, fitted with timer-controlled sample changers, which had been deployde in the sea for usually one year.
    Keywords: 104-1; 109-1; 111-2; 114-1; 117-1; 120-1; 121-1; 122-2; 57-04; 57-06; 57-07; 57-08; 57-09; 57-11; 57-12; 57-13; 57-14; 57-20; 58-08; Arctic Ocean; ARK-I/3; ARK-II/4; ARK-II/5; ARK-III/3; ARK-IV/3; BC; BI-1_trap; Box corer; Fram Strait; FS-1_trap; FS-2_trap; FS-3_trap; GC; GeoB; Geosciences, University of Bremen; Giant box corer; GIK16103-1; GIK16104-1; GIK16105-1; GIK16109-1; GIK16122-1; GIK16129-1; GIK16131-1; GIK16132-1; GIK16133-1; GIK16135-1; GIK16136-1; GIK16138-1; GIK16139-1; GIK16143-1; GIK16144-1; GIK16145-1; GIK16146-1; GIK16147-1; GIK16149-1; GIK16150-1; GIK16152-1; GIK16156-1; GIK16157-1; GIK16158-1; GIK16161-1; GIK16162-1; GIK16163-1; GIK16167-1; GIK16168-1; GIK16169-1; GIK16170-1; GIK16172-1; GIK16175-1; GIK16176-1; GIK16180-1; GIK21289-1 PS07/578; GIK21290-3 PS07/579; GIK21291-3 PS07/581; GIK21292-3 PS07/582; GIK21293-3 PS07/583; GIK21294-3 PS07/584; GIK21295-3 PS07/586; GIK21295-5 PS07/586; GIK21296-3 PS07/587; GIK21297-3 PS07/588; GIK21298-3 PS07/590; GIK21300-3 PS07/592; GIK21301-2 PS07/593; GIK21302-2 PS07/594; GIK21303-2 PS07/595; GIK21305-1 PS07/597; GIK21306-2 PS07/598; GIK21307-2 PS07/599; GIK21308-3 PS07/601; GIK21309-3 PS07/602; GIK21310-4 PS07/603; GIK21311-3 PS07/605; GIK21312-3 PS07/606; GIK21314-3 PS07/608; GIK21316-5 PS07/612; GIK21318-4 PS07/615; GIK21319-2 PS07/617; GIK21322-3 PS07/626; GIK21323-3 PS07/627; GIK21513-8 PS11/276-8; GIK21514-5 PS11/278-5; GIK21515-10 PS11/280-10; GIK21516-5 PS11/282-5; GIK21518-13 PS11/287-13; GIK21519-10 PS11/296-10; GIK21520-10 PS11/310-10; GIK21521-13 PS11/340-13; GIK21522-18 PS11/358-18; GIK21523-14 PS11/362-14; GIK21524-1 PS11/364-1; GIK21525-2 PS11/365-2; GIK21528-7 PS11/372-7; GIK21529-7 PS11/376-7; GIK21530-3 PS11/382-3; GIK21532-1 PS11/396-1; GIK23055-1; GIK23056-2; GIK23057-1; GIK23058-1; GIK23059-1; GIK23060-1; GIK23061-3; GIK23062-2; GIK23063-1; GIK23064-2; GIK23065-1; GIK23066-1; GIK23067-2; GIK23068-1; GIK23069-1; GIK23070-2; GIK23071-1; GIK23072-1; GIK23073-2; GIK23074-2; GIK23126-1 PS03/126; GIK23138-1 PS03/138; GIK23150-1 PS03/150; GIK23189-1 PS03/189; GIK23206-1 PS03/206; GIK23207-1 PS03/207; GIK23210-1 PS03/210; GIK23211-1 PS03/211; GIK23216-1 PS03/216; GIK23217-1 PS03/217; GIK23220-1 PS03/220; GIK23221-1 PS03/221; GIK23222-1 PS03/222; GIK23229-1 PS05/414; GIK23230-1 PS05/416; GIK23231-2 PS05/417; GIK23232-1 PS05/418; GIK23233-1 PS05/420; GIK23235-1 PS05/422; GIK23240-1 PS05/428; GIK23241-1 PS05/429; GIK23243-2 PS05/431; GIK23244-1 PS05/449; GIK23247-2 PS05/452; GIK23248-1 PS05/453; GKG; Gravity corer; Gravity corer (Kiel type); Håkon Mosby; HM52; HM52-02; HM57; HM57-04; HM57-05; HM57-06; HM57-07; HM57-08; HM57-09; HM57-11; HM57-12; HM57-13; HM57-14; HM57-20; HM58; HM58-02; HM58-08; HM82/83; ICE; Iceland Sea; Ice station; LB-1_trap; Lofoten Basin; M107-1; M118-1; M2/2; Meteor (1986); Mooring (long time); MOORY; Na-1_trap; Nansen Basin; NB-1_trap; Norway Slope; Norwegian Sea; Polarstern; PS03; PS05; PS07; PS1050-1; PS1060-1; PS1071-1; PS11; PS11/269-1; PS1105-1; PS1120-2; PS1121-1; PS1124-1; PS1125-1; PS1127-1; PS1128-1; PS1130-1; PS1131-1; PS1132-1; PS1229-1; PS1230-1; PS1231-2; PS1232-1; PS1233-1; PS1235-1; PS1240-1; PS1241-1; PS1243-2; PS1244-1; PS1247-2; PS1248-1; PS1289-1; PS1290-3; PS1291-3; PS1292-3; PS1293-3; PS1294-3; PS1295-3; PS1295-5; PS1296-3; PS1297-3; PS1298-3; PS1300-3; PS1301-2; PS1302-2; PS1303-2; PS1305-1; PS1306-2; PS1307-2; PS1308-3; PS1309-3; PS1310-4; PS1311-3; PS1312-3; PS1314-3; PS1316-5; PS1318-4; PS1319-2; PS1322-3; PS1323-3; PS1511-1; PS1513-8; PS1514-5; PS1515-10; PS1516-5; PS1518-13; PS1519-10; PS1520-10; PS1521-13; PS1522-18; PS1523-14; PS1524-1; PS1525-2; PS1528-7; PS1529-7; PS1530-3; PS1532-1; Quaternary Environment of the Eurasian North; QUEEN; Sea_Ice_A; Sea_Ice_B; Sea_Ice_C; Sea_Ice_D; SL; SP-1; SP-1_trap; Svalbard; Trap, sediment; TRAPS; Voering Plateau; Voring Plateau; VP-2_trap; Western Djupet
    Type: Dataset
    Format: application/zip, 18 datasets
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  • 6
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    Benthic foraminiferal biodiversity response to changing Arctic palaeoclimate (2007)
    PANGAEA
    In:  Supplement to: Wollenburg, Jutta Erika; Mackensen, Andreas; Kuhnt, Wolfgang (2007): Benthic foraminiferal biodiversity response to a changing Arctic palaeoclimate in the last 24.000 years. Palaeogeography, Palaeoclimatology, Palaeoecology, 255(3-4), 195-222, https://doi.org/10.1016/j.palaeo.2007.05.007
    Details
    Publication Date: 2024-06-26
    Description: Four sediment cores recovered from 1000 to 2500 m water depth in the Arctic Ocean, tracing the inflowing Atlantic water from Fram Strait, Yermak Plateau, northern Barents Sea continental slope as far as the Laptev Sea, have been analyzed for species richness and diversity. Samples were wet sieved after freeze-drying using a 63-µm sieve. Where possible at least 300 specimens were counted from the size fraction 〉63 µm, however, samples from deglacial periods are often affected by carbonate dissolution. In such samples foraminiferal numbers are low. Samples containing less than 40 specimens were excluded from statistical analyses. Because we are aware that specimen numbers 〈100 specimen are still critical for H analyses, core sections containing less than 100 specimens are highlighted in the figures. Here, we will characterize biodiversity trends by the two most widely used biodiversity measurements, the information function H (Buzas and Gibson, 1969) with its decomposition equation ln(S) and ln(E) (Buzas and Hayek, 1996), and the Fisher Alpha Index (Fisher, Corbett, and Williams, 1943). For spectral analysis the Fisher alpha record of core PS2837-5 was resampled at equally spaced 100-year intervals. For the spectral analysis, two methodes were used within the ANALYSERIES software package (Paillard et al., 1996): 1. The Blackman-Tuckey (1958) for its high confidence of the results; 2. The maximum entropy method (e.g. Haykin, 1983) for its high resolution. The cores reveal well-correlated biodiversity maxima and minima. Distinct periodicities of species richness variability of 1.57 kyr and 0.76 kyr characterize the Late Weichselian, and of 1.16 kyr and 0.54 kyr even more pronounced the Holocene. The biodiversity maxima/minima coincide with terrestrial and marine warm and cool events at high northern latitude. We suggest that either the physiology of most rare species is temperature sensitive, or sustained food supply increased the taxonomic richness during warmer intervals.
    Keywords: ARK-III/3; ARK-IX/4; ARK-VIII/3; ARK-XIII/2; AWI_Paleo; Fram Strait; GIK21290-4 PS07/579; Gravity corer (Kiel type); KAL; Kasten corer; Laptev Sea; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS07; PS1290-4; PS19/245; PS19 ARCTIC91; PS2212-3; PS2458-4; PS27; PS27/038; PS2837-5; PS44; PS44/065; SL; Yermak Plateau
    Type: Dataset
    Format: application/zip, 8 datasets
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  • 7
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    Organic carbon and nitrogen concentrations on vertical profiles in waters of the Baltic Sea in February-March 1995 (2008)
    PANGAEA
    Details
    Publication Date: 2024-06-26
    Description: Not filtered water samples were taken in 10 ml ampoules (sealed immediately after being acidified with phosphoric acid to pH〈2, sampling), or 40 ml screw-lid vials, and measured onboard at sampling or next days, or frozen (-20°C) until being acidified and measured in home labs. Carbon measurement was by high-temperature catalytic oxydation in a 10 cm column packed with 5% Pt on aluminum oxide beads at 900°C in a stream of oxygen, and CO2 detection by infrared extinction after the removal of moisture and SO2 by appropriate traps (cold trap, Mg-percarbonate, Na-pyrophosphate, tin, bronze or Sulfix). The apparatus was the dual channel Dimatek 2000 equipped with a Binos 200 detector. Nitrogen was measured by chemoluminescence detection of NO2 in the combustion gases after leaving the Binos detector in one of the two channels of the setup. Most measurements of samples containing high nitrate were discarded, when data were inconsistent. The nature of nitrate interference is not clear.
    Keywords: AL79A; AL79A_BY38; AL79A_F1; AL79A_F10; AL79A_F11; AL79A_F14; AL79A_F19; AL79A_F2; AL79A_F20; AL79A_F22; AL79A_F23; AL79A_F3; AL79A_F4; AL79A_F5; AL79A_F7; AL79A_F8; AL79A_F9; AL79A_S21; Alkor (1990); Baltic Sea; Bottle, Niskin 10-L; NIS_10L
    Type: Dataset
    Format: application/zip, 17 datasets
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  • 8
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    Radiolarian-based paleotemperatures of ODP Site 177-1089 in the Atlantic Sector of the Southern Ocean (2002)
    PANGAEA
    In:  Supplement to: Cortese, Giuseppe; Abelmann, Andrea (2002): Radiolarian-based paleotemperatures during the last 160 kyrs at ODP Site 1089 (Southern Ocean, Atlantic Sector). Palaeogeography, Palaeoclimatology, Palaeoecology, 182(3-4), 259-286, https://doi.org/10.1016/S0031-0182(01)00499-0
    Details
    Publication Date: 2024-06-26
    Description: Two cores, Site 1089 (ODP Leg 177) and PS2821-1, recovered from the same location (40°56'S; 9°54'E) at the Subtropical Front (STF) in the Atlantic Sector of the Southern Ocean, provide a high-resolution climatic record, with an average temporal resolution of less than 600 yr. A multi-proxy approach was used to produce an age model for Core PS2821-1, and to correlate the two cores. Both cores document the last climatic cycle, from Marine Isotopic Stage 6 (MIS 6, ca. 160 kyr BP, ka) to present. Summer sea-surface temperatures (SSSTs) have been estimated, with a standard error of ca. +/-1.16°C, for the down core record by using Q-mode factor analysis (Imbrie and Kipp method). The paleotemperatures show a 7°C warming at Termination II (last interglacial, transition from MIS 6 to MIS 5). This transition from glacial to interglacial paleotemperatures (with maximum temperatures ca. 3°C warmer than present at the core location) occurs earlier than the corresponding shift in delta18O values for benthic foraminifera from the same core; this suggests a lead of Southern Ocean paleotemperature changes compared to the global ice-volume changes, as indicated by the benthic isotopic record. The climatic evolution of the record continues with a progressive temperature deterioration towards MIS 2. High-frequency, millennial-scale climatic instability has been documented for MIS 3 and part of MIS 4, with sudden temperature variations of almost the same magnitude as those observed at the transitions between glacial and interglacial times. These changes occur during the same time interval as the Dansgaard-Oeschger cycles recognized in the delta18Oice record of the GRIP and GISP ice cores from Greenland, and seem to be connected to rapid changes in the STF position in relation to the core location. Sudden cooling episodes ('Younger Dryas (YD)-type' and 'Antarctic Cold Reversal (ACR)-type' of events) have been recognized for both Termination I (ACR-I and YD-I events) and II (ACR-II and YD-II events), and imply that our core is located in an optimal position in order to record events triggered by phenomena occurring in both hemispheres. Spectral analysis of our SSST record displays strong analogies, particularly for high, sub-orbital frequencies, to equivalent records from Vostok (Antarctica) and from the Subtropical North Atlantic ocean. This implies that the climatic variability of widely separated areas (the Antarctic continent, the Subtropical North Atlantic, and the Subantarctic South Atlantic) can be strongly coupled and co-varying at millennial time scales (a few to 10-ka periods), and eventually induced by the same triggering mechanisms. Climatic variability has also been documented for supposedly warm and stable interglacial intervals (MIS 1 and 5), with several cold events which can be correlated to other Southern Ocean and North Atlantic sediment records.
    Keywords: 177-1089; Agulhas Basin; Agulhas Ridge; ANT-IV/3; ANT-IV/4; ANT-IX/2; ANT-IX/4; ANT-VIII/3; ANT-VIII/6; ANT-X/5; ANT-XI/2; ANT-XI/4; Astrid Ridge; Atka Bay; Atlantic Ridge; AWI_Paleo; Brazil Basin; Cape Basin; COMPCORE; Composite Core; Filchner Shelf; Fram Strait; GeoB2004-1; GeoB2007-1; GeoB2008-1; GeoB2016-3; GeoB2018-1; GeoB2019-2; GeoB2021-4; GeoB2022-3; Giant box corer; GKG; Gravity corer (Kiel type); Indian-Antarctic Ridge; Joides Resolution; Lazarev Sea; Leg177; M23/1; Maud Rise; Meteor (1986); Meteor Rise; MIC; MiniCorer; MSN; MUC; MultiCorer; Multiple opening/closing net; Ocean Drilling Program; ODP; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; PLA; Plankton net; Polarstern; PS08; PS08/356; PS08/364; PS08/365; PS08/374; PS08/610; PS1380-1; PS1386-1; PS1387-1; PS1394-1; PS1455-4; PS16; PS16/267; PS16/271; PS16/281; PS16/294; PS16/306; PS16/311; PS16/316; PS16/321; PS16/323; PS16/329; PS16/334; PS16/337; PS16/342; PS16/345; PS16/351; PS16/354; PS16/362; PS16/366; PS16/372; PS16/507; PS16/518; PS16/534; PS16/540; PS16/547; PS16/557; PS1751-2; PS1752-5; PS1755-1; PS1759-1; PS1765-1; PS1768-1; PS1771-4; PS1772-2; PS1773-2; PS1774-1; PS1775-5; PS1776-6; PS1777-7; PS1778-1; PS1779-3; PS1780-1; PS1782-6; PS1783-2; PS1786-2; PS18; PS18/055; PS18/075; PS18/084; PS18/088; PS18/092; PS18/096; PS18/229; PS18/232; PS18/236; PS18/237; PS18/238; PS18/239; PS18/241; PS18/244; PS18/261; PS18/262; PS18/263; PS18/267; PS1805-5; PS18 06AQANTIX_2; PS1813-3; PS1821-5; PS1823-1; PS1825-5; PS1831-5; PS1957-1; PS1967-1; PS1973-1; PS1975-1; PS1977-1; PS1979-1; PS2073-1; PS2076-1; PS2080-1; PS2081-1; PS2082-3; PS2083-2; PS2084-2; PS2087-1; PS2103-2; PS2104-2; PS2105-2; PS2109-3; PS22/690; PS22 06AQANTX_5; PS2254-1; PS2256-4; PS2487-2; PS2488-1; PS2489-4; PS2491-4; PS2492-1; PS2493-3; PS2494-1; PS2495-1; PS2496-2; PS2498-2; PS2557-2; PS2560-3; PS2561-1; PS2562-1; PS2563-3; PS2564-2; PS28; PS28/236; PS28/243; PS28/256; PS28/264; PS28/277; PS28/280; PS28/289; PS28/293; PS28/298; PS28/304; PS30; PS30/004; PS30/023; PS30/030; PS30/038; PS30/043; PS30/048; Shona Ridge; SL; South African margin; South Atlantic; South Atlantic Ocean; South Sandwich Basin; South Sandwich Islands; South Sandwich Trough; Water sample; Weddell Sea; WS
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 9
    facet.materialart.
    Unknown
    Geochemistry of sediments cores in the Mediterranean Sea (2003)
    PANGAEA
    In:  Supplement to: Weldeab, Syee; Emeis, Kay-Christian; Hemleben, Christoph; Schmiedl, Gerhard; Schulz, Hartmut (2003): Spatial productivity variations during formation of sapropels S5 and S6 in the Mediterranean Sea: Evidence from Ba contents. Palaeogeography, Palaeoclimatology, Palaeoecology, 191(2), 169-190, https://doi.org/10.1016/S0031-0182(02)00711-3
    Details
    Publication Date: 2024-06-26
    Description: We investigated five time-equivalent core sections (180-110 kyr BP) from the Balearic Sea (Menorca Rise), the easternmost Levantine Basin and southwest, south, and southeast of Crete to reconstruct spatial patterns of productivity during deposition of sapropels S5 and S6 in the Mediterranean Sea. Our indicators are Ba, total organic carbon and carbonate contents. We found no indications of Ba remobilization within the investigated core intervals, and used the accumulation rate of biogenic Ba to compute paleoproductivity. Maximum surface water productivity (up to 350 g C/m2/yr) was found during deposition of S5 (isotope stage 5e) but pronounced spatial variability is evident. Coeval sediment intervals in the Balearic Sea show very little productivity change, suggesting that chemical and biological environments in the eastern and western Mediterranean basins were decoupled in this interval. We interpret the spatial variability as the result of two different modes of nutrient delivery to the photic zone: riverderived nutrient input and shoaling of the pycnocline/nutricline to the photic zone. The productivity increase during the formation of S6 was moderate compared to S5 and had a less marked spatial variability within the study area of the eastern Mediterranean Sea. Given that S6 formed during a glacial interval, glacial boundary conditions such as high wind stress and/or cooler surface water temperatures apparently favored lateral and vertical mixing and prevented the development of the spatial gradients within the Eastern Mediterranean Sea (EMS) observed for S5. A non-sapropel sediment interval with elevated Ba content and depleted 18O/16O ratios in planktonic foraminifer calcite was detected between S6 and S5 that corresponds to the weak northern hemisphere insolation maximum at 150 kyr. At this time, productivity apparently increased up to five times over surrounding intervals, but abundant benthic fauna show that the deep water remained oxic. Following our interpretation, the interval denotes a failed sapropel, when a weaker monsoon did not force the EMS into permanent stratification. The comparison of interglacial and glacial sapropels illustrates the relevance of climatic boundary conditions in the northern catchment in determining the facies and spatial variability of sapropels within the EMS.
    Keywords: 160-964A; 160-966A; 160-969E; 160-970A; 160-971A; 160-973A; 67; DRILL; Drilling/drill rig; Eastern Basin; Eastern Mediterranean Sea; E of Crete; GeoB; GeoB5846-2; Geosciences, University of Bremen; GeoTü; GeoTü SL71; Gravity corer (Kiel type); Joides Resolution; KL_Mg; Leg160; M40/4; M40/4_87-6SL; M40/4_KL51; M40/4_MUC65; M40/4_MUC66; M40/4_MUC67; M40/4_MUC68; M40/4_MUC69; M40/4_MUC70; M40/4_MUC71; M40/4_MUC72; M40/4_MUC75; M40/4_MUC76-3; M40/4_MUC77A; M40/4_SL67; M40/4_SL71; M40/4_SL87; M44_1 GeoTü KL-83; M44/3; M44/3_KL83; Meteor (1986); MUC; MultiCorer; Ocean Drilling Program; ODP; Paleoceanography at Tübingen University; Piston corer Meischner large; SESAME; SL; Southern European Seas: Assessing and Modelling Ecosystem Changes
    Type: Dataset
    Format: application/zip, 19 datasets
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  • 10
    facet.materialart.
    Unknown
    Sedimentology of ODP Site 177-1090 and core PS2489-2 in the southeastern South Atlantic (2002)
    PANGAEA
    In:  Supplement to: Diekmann, Bernhard; Kuhn, Gerhard (2002): Sedimentary record of the mid-Pleistocene climate transition in the southeastern South Atlantic (ODP Site 1090). Palaeogeography, Palaeoclimatology, Palaeoecology, 182(3-4), 241-258, https://doi.org/10.1016/S0031-0182(01)00498-9
    Details
    Publication Date: 2024-06-26
    Description: One important goal of Leg 177 of the Ocean Drilling Program (ODP) was to explore the nature of the mid-Pleistocene climate transition (MPT) on the southern hemisphere. A suitable MPT record was encountered at Site 1090 in the southeastern South Atlantic, where a 44-m-thick sequence of Quaternary diatom-bearing foraminiferal muds and oozes was recovered on the Agulhas Ridge. Environmental responses to the MPT comprised changes in terrestrial climate, biological productivity, and regional ocean circulation, as inferred from compositional sediment data and clay mineralogy. A shift towards more arid conditions occurred between 900 and 800 ka in southern Africa. Changes in palaeoceanography already started earlier. Since 1150 ka, northward displacements of the Polar Front appeared during glacial periods and shifted the area of dominant diatom deposition towards Site 1090. Likewise, glacial-interglacial contrasts in regional conveyor circulation strengthened after 1200 ka and became most severe after 650 ka. However, while changes in regional conveyor circulation likely responded in tune with global ice-volume changes and show the onset of 100-kyr cycles after 1200 ka, an unusual 130-kyr pattern characterises the pattern of frontal movements between 1200 ka and 650 ka, probably in response to imperfect adaptation of regional climate to the global 100-kyr climate cycles.
    Keywords: 177-1090B; 177-1090D; 177-1090E; Agulhas Ridge; ANT-XI/2; AWI_Paleo; DRILL; Drilling/drill rig; Joides Resolution; KL; Leg177; Ocean Drilling Program; ODP; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Piston corer (BGR type); Polarstern; PS2489-2; PS28; PS28/256; South Atlantic Ocean
    Type: Dataset
    Format: application/zip, 4 datasets
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