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  • 1
    Monograph available for loan
    Monograph available for loan
    Paleoclimates : understanding climate change past and present (2010)
    New York, NY : Columbia Univ. Press
    Details Availability
    Call number: 12/M 10.0313
    Description / Table of Contents: The field of paleoclimatology relies on physical, chemical, and biological proxies of past climate changes that have been preserved in natural archives such as glacial ice, tree rings, sediments, corals, and speleothems. Paleoclimate archives obtained through field investigations, ocean sediment coring expeditions, ice sheet coring programs, and other projects allow scientists to reconstruct climate change over much of earth's history. When combined with computer model simulations, paleoclimatic reconstructions are used to test hypotheses about the causes of climatic change, such as greenhouse gases, solar variability, earth's orbital variations, and hydrological, oceanic, and tectonic processes. This book is a comprehensive, state-of-the art synthesis of paleoclimate research covering all geological timescales, emphasizing topics that shed light on modern trends in the earth's climate. Thomas M.Cronin discusses recent discoveries about past periods of global warmth, changes in atmospheric greenhouse gas concentrations, abrupt climate and sea-level change, natural temperature variability, and other topics directly relevant to controversies over the causes and impacts of climate change.
    Type of Medium: Monograph available for loan
    Pages: XVIII, 441 S. , Ill., graph. Darst., Kt.
    ISBN: 9780231144940
    Classification:
    Meteorology and Climatology
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Episodic fresh surface waters in the Eocene Arctic Ocean (2006)
    [s.l.] : Nature Publishing Group
    Nature 441 (2006), S. 606-609 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It has been suggested, on the basis of modern hydrology and fully coupled palaeoclimate simulations, that the warm greenhouse conditions that characterized the early Palaeogene period (55–45 Myr ago) probably induced an intensified hydrological cycle with precipitation exceeding ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature04692
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    Paper (German National Licenses)
    Fulltext
  • 3
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    (Table 1) Age markers and errors for the last 1215 ka in IODP Exp302 (2010)
    PANGAEA
    Details
    Publication Date: 2023-03-02
    Description: Despite its importance in the global climate system, age-calibrated marine geologic records reflecting the evolution of glacial cycles through the Pleistocene are largely absent from the central Arctic Ocean. This is especially true for sediments older than 200 ka. Three sites cored during the Integrated Ocean Drilling Program's Expedition 302, the Arctic Coring Expedition (ACEX), provide a 27 m continuous sedimentary section from the Lomonosov Ridge in the central Arctic Ocean. Two key biostratigraphic datums and constraints from the magnetic inclination data are used to anchor the chronology of these sediments back to the base of the Cobb Mountain subchron (1215 ka). Beyond 1215 ka, two best fitting geomagnetic models are used to investigate the nature of cyclostratigraphic change. Within this chronology we show that bulk and mineral magnetic properties of the sediments vary on predicted Milankovitch frequencies. These cyclic variations record ''glacial'' and ''interglacial'' modes of sediment deposition on the Lomonosov Ridge as evident in studies of ice-rafted debris and stable isotopic and faunal assemblages for the last two glacial cycles and were used to tune the age model. Potential errors, which largely arise from uncertainties in the nature of downhole paleomagnetic variability, and the choice of a tuning target are handled by defining an error envelope that is based on the best fitting cyclostratigraphic and geomagnetic solutions.
    Keywords: 302-CompSite; Age, comment; Age, maximum/old; Age, minimum/young; Age model; Arctic Coring Expedition, ACEX; Calculated, see reference(s); CCGS Captain Molly Kool (Vidar Viking); COMPCORE; Composite Core; Datum level; DEPTH, sediment/rock; Exp302; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; see comment; see reference(s)
    Type: Dataset
    Format: text/tab-separated-values, 124 data points
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  • 4
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    Ostracoda communities from DSDP Holes 95-612 and 95-613
    PANGAEA
    In:  Supplement to: Cronin, Thomas M; Compton-Gooding, Ellen E (1987): Cenozoic ostracoda from Deep Sea Drilling Project Leg 95 off New Jersey (Sites 612 and 613). In: Poag, CW; Watts, AB; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 95, 439-451, https://doi.org/10.2973/dsdp.proc.95.116.1987
    Details
    Publication Date: 2023-05-12
    Description: Ninety-three samples from DSDP Leg 95, Sites 612 and 613, were examined for ostracodes to aid in the study of paleoceanography and paleodepth. In total, more than 25 genera were recovered. The most abundant and diverse ostracode assemblages were from the middle Eocene at both sites; lower and upper Eocene and Pliocene-Pleistocene assemblages were less abundant and were dominated by only three or four species. The middle Eocene assemblages were the most diagnostic of paleoenvironment and suggest water depths of 1000 to 2000 m. These assemblages are similar to other middle Eocene assemblages known from the Caribbean and North Atlantic, and signify a relatively cosmopolitan fauna that inhabited moderately deep but relatively warm bottom waters.
    Keywords: Deep Sea Drilling Project; DSDP
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 5
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    (Table S2) Stratigraphic correlation tie points between IODP Exp302 composite core, PS-2185-6 and 96/1-PC
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: 302-CompSite; Arctic Coring Expedition, ACEX; CCGS Captain Molly Kool (Vidar Viking); COMPCORE; Composite Core; Depth, reference; DEPTH, sediment/rock; Exp302; Integrated Ocean Drilling Program / International Ocean Discovery Program; Intercore correlation; IODP
    Type: Dataset
    Format: text/tab-separated-values, 39 data points
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  • 6
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    (Table S3) Possible ties beyond 1215 ka in the slower sedimentation rate age model of IODP Exp302 composite core
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: 302-CompSite; Age model; Arctic Coring Expedition, ACEX; CCGS Captain Molly Kool (Vidar Viking); COMPCORE; Composite Core; Datum level; DEPTH, sediment/rock; Exp302; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP
    Type: Dataset
    Format: text/tab-separated-values, 28 data points
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  • 7
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    (Table S3) Possible ties beyond 1215 ka in the faster sedimentation rate age model of IODP Exp302 composite core
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: 302-CompSite; Age model; Arctic Coring Expedition, ACEX; CCGS Captain Molly Kool (Vidar Viking); COMPCORE; Composite Core; Datum level; DEPTH, sediment/rock; Exp302; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP
    Type: Dataset
    Format: text/tab-separated-values, 12 data points
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  • 8
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    (Table 4) Absolute abundance of ostracoda in shallow Arctic coretop samples
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: 80PB50; 81-APB-13; AC-71-36; AC-71-38; AC-71-48; Area/locality; AW-2375; AW-2839; AW-2904; AW-2905; AW-3101A; AW-3143; AW-3154; AW-3161; AW-57-328-46; AW-62-160-10; AW-62-160-7; AW-62-160-8; AW-62-160-9; AW-IH25; AW-NN; AW-V6-33-78-21; Barnes26-80; Barnes27-80; Barnes56-80; Bart.30; Bart.46; Bart.49; Bart.55; Bart.LT23Hazel3; Bart.LT26Hazel2; Bart.LT30; Bart.LT35Hazel5; Bart.N.Omenolu; Beaufort Sea; Canadian Beaufort; Cape Martineau; Chest.Inlet1; Chest.Inlet2; Chest.Inlet5; Chest.Inlet8; Chest.Inlet9; Chikchi Sea; Counting 〉150 µm fraction; DC1-79-EG-1; DC2-80-EG-186; DC2-80-EG-73; DEPTH, sediment/rock; EGAL-75-KC-53; E Greenland; Elevation of event; Event label; Gulf of Alaska; GV8202745; GV82027-67; GV83033#44; GV83033#45; HU69-050.830; HU69-050.836; HU85-027-76; Hudson Bay; Hudson Strait; Hurd Channel; Ikerssauk15; Ikerssauk2; Ikerssauk4; Ikerssauk5; Kara Sea; Labrador; Latitude of event; Longitude of event; Melville Penin.; Northwind5; Northwind65#106; Northwind65#112; Northwind65#115; Northwind65#41; Norton Sound; N Star Bay, Greenl.; Ostracoda; Penney274101; PenneyIkerss.#1; PRZO70-22-130; PRZO72-44; Quaternary Environment of the Eurasian North; QUEEN; S5-77-BS-17; SEA5-125A; SEA-5-76-174; SW Greenland; Ungava Bay; W Greenland; WhiteBearHazel18
    Type: Dataset
    Format: text/tab-separated-values, 134 data points
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  • 9
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    Distribution of ostracoda in three long sediment cores from the deep eastern Arctic Ocean
    PANGAEA
    In:  Supplement to: Jones, Richard LI; Whatley, Robin C; Cronin, Thomas M; Dowsett, Harry J (1999): Reconstructing late Quaternary deep-water masses in the eastern Arctic Ocean using benthonic ostracoda. Marine Micropaleontology, 37(3-4), 251-272, https://doi.org/10.1016/S0377-8398(99)00022-5
    Details
    Publication Date: 2023-06-27
    Description: The distribution of Ostracoda in three long cores from the deep eastern Arctic Ocean was studied to determine the palaeoceanographical history of the Eurasian Basin during the late Quaternary. The samples for this study were obtained from the Lomonosov Ridge, Morris Jesup Rise and Yermak Plateau during the Arctic 91 expedition. Ostracoda previously studied in coretops at the same sites as the present study have shown that individual species have a strong association with different water masses and bathymetry. Throughout the late Quaternary, cores exhibit ostracod-rich layers separated by barren intervals. On the basis of biostratigraphical, isotopic and palaeomagnetic data the fossiliferous levels are interpreted as representing interglacial stages. The twenty most significant species were selected for subsequent quantitative investigation using Cluster and Factor analyses, in order to determine similarity and variance between the assemblages. An additional statistical method employing Modern Analogues and the Squared Chord Distance dissimilarity coefficient was utilised to compare the present late Quaternary fossil samples with a modern Arctic database. The results reveal a major faunal division within the Arctic Ocean Deep Water (AODW). Highly abundant and diverse assemblages within the cores were found to group and have good analogues with the Recent bathyal depth (1000-2500 m) upper AODW assemblages. Conversely, assemblages with low abundance and diversity correlate well with abyssal depth (〉3000 m) lower AODW assemblages. The palaeoceanographical history is complicated by the influence of adjacent water masses such as Canada Basin Deep Water (CBDW), Greenland Sea Deep Water (GSDW) and most importantly, Arctic Intermediate Water (AIW), which all had an influence on the ostracod assemblages during the late Quaternary. An enhanced flow of warm saline AIW into the Eurasian Basin results in species-rich upper AODW assemblages having good analogues down to 2750 m in the water column. In contrast, lower AODW assemblages influenced by cold well-oxygenated GSDW give analogues at depths as shallow as 1000 m. The faunal changes are the consequence of rapid climatic fluctuations in the eastern Arctic Ocean during the late Quaternary that are intrinsically linked to palaeoceanographical alternations in warm and cold current inflow from adjacent basins.
    Keywords: ARK-VIII/3; KAL; Kasten corer; Lomonosov Ridge, Arctic Ocean; Morris Jesup Rise; Polarstern; PS19/186; PS19/218; PS19/245; PS19 ARCTIC91; PS2185-6; PS2200-5; PS2212-3; Yermak Plateau
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 10
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    Age determination and stable carbon isotope ratios of Neogloboquadrina pachyderma of IODP Hole 302-M0004C (2008)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Description: The Integrated Ocean Drilling Program (IODP) Arctic Coring Expedition (ACEX) Hole 4C from the Lomonosov Ridge in the central Arctic Ocean recovered a continuous 18 m record of Quaternary foraminifera yielding evidence for seasonally ice-free interglacials during the Matuyama, progressive development of large glacials during the mid-Pleistocene transition (MPT) ~1.2-0.9 Ma, and the onset of high-amplitude 100-ka orbital cycles ~500 ka. Foraminiferal preservation in sediments from the Arctic is influenced by primary (sea ice, organic input, and other environmental conditions) and secondary factors (syndepositional, long-term pore water dissolution). Taking these into account, the ACEX 4C record shows distinct maxima in agglutinated foraminiferal abundance corresponding to several interglacials and deglacials between marine isotope stages (MIS) 13-37, and although less precise dating is available for older sediments, these trends appear to continue through the Matuyama. The MPT is characterized by nearly barren intervals during major glacials (MIS 12, 16, and 22-24) and faunal turnover (MIS 12-24). Abundant calcareous planktonic (mainly Neogloboquadrina pachyderma sin.) and benthic foraminifers occur mainly in interglacial intervals during the Brunhes and very rarely in the Matuyama. A distinct faunal transition from calcareous to agglutinated foraminifers 200-300 ka in ACEX 4C is comparable to that found in Arctic sediments from the Lomonosov, Alpha, and Northwind ridges and the Morris Jesup Rise. Down-core disappearance of calcareous taxa is probably related to either reduced sea ice cover prior to the last few 100-ka cycles, pore water dissolution, or both.
    Keywords: 302-M0004C; ACEX-M4C; Age, 14C AMS; Age, 14C calibrated, CALIB (Stuiver & Reimer, 1993); Age, dated; Age, dated material; Age, error; Age, maximum/old; Age, minimum/young; Arctic Coring Expedition, ACEX; Arctic Ocean; Calendar age; CCGS Captain Molly Kool (Vidar Viking); DEPTH, sediment/rock; Exp302; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Isotope ratio mass spectrometry; Neogloboquadrina pachyderma dextral and/or sinistral, δ13C; Sample, optional label/labor no; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 30 data points
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