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  • 2005-2009  (41)
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  • 11
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    A radiocarbon-based assessment of the preservation characteristics of crenarchaeol and alkenones from continental margin sediments (2008)
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © Elsevier B.V. , 2008. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Organic Geochemistry 39 (2008): 1039-1045, doi:10.1016/j.orggeochem.2008.02.006.
    Description: Crenarchaeotal glycerol dibiphytanyl glycerol tetraether (GDGT) lipids and alkenones are two types of biomarkers derived from planktonic marine micro-organisms which are used for reconstruction of sea-surface temperatures. We determined the radiocarbon contents of the archaeal GDGT crenarchaeol and of alkenones isolated from continental margin sediments. Systematic differences were found between the two biomarkers, with higher radiocarbon contents in crenarchaeol than in the phytoplankton-derived alkenones. These differences can be explained by variable contributions of pre-aged, laterally advected material to the core sites. Crenarchaeol appears to be more efficiently degraded during transport in oxygen-replete environments than alkenones. Whether this reflects the influence of chemical structure or mode of protection (e.g., particle association) is not yet known.
    Description: This work was funded by a Spinoza grant of NWO to J.S.S.D. and by NSF-grant OCE-0327405 to T.I.E..
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
    Format: application/pdf
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  • 12
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    An unusual 17α,21β(H)-bacteriohopanetetrol in Holocene sediments from Ace Lake (Antarctica) (2008)
    Details
    Publication Date: 2022-05-26
    Description: Author Posting. © Elsevier B.V., 2008. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Organic Geochemistry 39 (2008): 1029-1032, doi:10.1016/j.orggeochem.2008.01.008.
    Description: Whilst investigating the intact biohopanoid (bacteriohopanepolyol, BHP) distribution in Holocene sediments from Ace Lake (Antarctica), we have identified the presence of ab- bacteriohopanetetrol in sediments aged up to 9400 years BP. To our knowledge, this is the first time that an intact polyfunctionalised BHP with the “geological” 17α,21β(H) configuration has been identified in a sediment. Previously, this structure has only been observed in species of the nitrogen fixing bacterium Frankia. Its presence here in the sedimentary environment has implications for the interpretation of hopanoid ββ/αβ ratios in the geological record.
    Description: This work was supported by grants from the Australian Antarctic Science Advisory Committee (1166 to J.V.) and the Netherlands Organization for Scientific Research (NWO; 851.20.006 to J.S.S.D. and NWO-VENI grant 016.051.014 to M.J.L.C.) We gratefully acknowledge the NERC for funding (HMT) and The Science Research Infrastructure Fund (SRIF) from HEFCE for funding the purchase of the Thermo Electron Finnigan LCQ ion trap mass spectrometer.
    Keywords: Ace Lake ; Bacteriohopanepolyols ; αβ-bacteriohopanetetrol ; Holocene
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
    Format: application/pdf
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  • 13
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    Stable carbon isotopes ratios of n-alkanes of sediment core GeoB9528-3 (2009)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 313; AGE; DEPTH, sediment/rock; GeoB9528-3; Gravity corer (Kiel type); M65/1; Mass spectrometer ThermoFisher Delta V; Meteor (1986); n-Alkane C29, δ13C; n-Alkane C29, δ13C, standard deviation; n-Alkane C31, δ13C; n-Alkane C31, δ13C, standard deviation; SL
    Type: Dataset
    Format: text/tab-separated-values, 548 data points
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  • 14
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    Stable oxygen and carbon isotopes ratios of Cibicidoides wuellerstorfi of sediment core GeoB9528-3 (2009)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 313; AGE; Cibicidoides wuellerstorfi, δ13C; Cibicidoides wuellerstorfi, δ18O; DEPTH, sediment/rock; GeoB9528-3; Gravity corer (Kiel type); M65/1; Mass spectrometer ThermoFisher Delta V; Meteor (1986); SL
    Type: Dataset
    Format: text/tab-separated-values, 618 data points
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  • 15
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    Stable oxygen and carbon isotopes ratios of sediment core GeoB9528-3 (2009)
    PANGAEA
    In:  Supplement to: Castañeda, Isla S; Mulitza, Stefan; Schefuß, Enno; Lopes dos Santos, Raquel A; Sinninghe Damsté, Jaap S; Schouten, Stefan (2009): Wet phases in the Sahara/Sahel region and human migration patterns in North Africa. Proceedings of the National Academy of Sciences of the United States of America, 106(48), 20159-20163, https://doi.org/10.1073/pnas.0905771106
    Details
    Publication Date: 2023-06-27
    Description: The carbon isotopic composition of individual plant leaf waxes (a proxy for C3 vs. C4 vegetation) in a marine sediment core collected from beneath the plume of Sahara-derived dust in northwest Africa reveals three periods during the past 192,000 years when the central Sahara/Sahel contained C3 plants (likely trees), indicating substantially wetter conditions than at present. Our data suggest that variability in the strength of Atlantic meridional overturning circulation (AMOC) is a main control on vegetation distribution in central North Africa, and we note expansions of C3 vegetation during the African Humid Period (early Holocene) and within Marine Isotope Stage (MIS) 3 (approx. 50-45 ka) and MIS 5 (approx. 120-110 ka). The wet periods within MIS 3 and 5 coincide with major human migration events out of sub-Saharan Africa. Our results thus suggest that changes in AMOC influenced North African climate and, at times, contributed to amenable conditions in the central Sahara/Sahel, allowing humans to cross this otherwise inhospitable region.
    Keywords: 313; GeoB9528-3; Gravity corer (Kiel type); M65/1; Meteor (1986); SL
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 16
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    (Appendix B) Calcareous nannofossil range chart of DSDP Hole 75-530A (2008)
    PANGAEA
    Details
    Publication Date: 2023-07-10
    Keywords: 75-530A; Ahmuellerella cf. octoradiata; Ahmuellerella octoradiata; Axopodorhabdus albianus; Biscutum cf. ellipticum; Biscutum constans; Broinsonia cf. signata; Broinsonia enormis; Broinsonia matalosa; Broinsonia signata; Chiastozygus litterarius; Chiastozygus platyrhethus; Chiastozygus striatus; Corollithion cf. exiguum; Corollithion madagaskarensis; Corollithion signum; Cribrosphaerella ehrenbergii; Cyclagelosphaera rotaclypeata; Cylindralithus nudus; Cylindralithus sculptus; Cylindralithus sp.; Deep Sea Drilling Project; DEPTH, sediment/rock; Discorhabdus ignotus; DRILL; Drilling/drill rig; DSDP; Eiffellithus gorkae; Eiffellithus turriseiffelii; Eprolithus apertior; Eprolithus floralis; Eprolithus moratus; Etching index; Flabellites oblongus; Gartnerago obliquum; Gartnerago segmentatum; Gartnerago sp.; Glomar Challenger; Haqius circumradiatus; Helicolithus compactus; Helicolithus trabeculatus; Isocrystallithus compactus; Leg75; Lithraphidites carniolensis; Lithraphidites pseudoquadratus; Loxolithus armilla; Manivitella pemmatoidea; Nannofossil abundance; Percivalia fenestrata; Placozygus cf. fibuliformis; Prediscosphaera columnata; Prediscosphaera cretacea; Prediscosphaera grandis; Prediscosphaera incohatus; Prediscosphaera ponticula; Prediscosphaera spinosa; Quadrum gartneri; Quadrum intermedium; Radiolithus planus; Retecapsa angustiforata; Retecapsa crenulata; Retecapsa sp.; Retecapsa surirella; Rhabdolithina splendens; Rhagodiscus achylostaurion; Rhagodiscus angustus; Rhagodiscus asper; Rhagodiscus reniformis; Rotelapillus crenulatus; Sample ID; Sollasites horticus; Sollasites sp.; South Atlantic/RIDGE; Staurolithites angustus; Staurolithites flavus; Staurolithites laffittei; Stoverius achylosus; Tegumentum stradneri; Tranolithus gabalus; Tranolithus orionatus; Watznaueria barnesae; Watznaueria biporta; Watznaueria fossacincta; Watznaueria manivitae; Watznaueria ovata; Zeugrhabdotus bicrescenticus; Zeugrhabdotus embergeri; Zeugrhabdotus noeliae; Zeugrhabdotus scutula; Zeugrhabdotus trivectis; Zygolithus diplogrammus
    Type: Dataset
    Format: text/tab-separated-values, 496 data points
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  • 17
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    (Table 1) Stable carbon isotope record and calculated recycled DIC for sediment core ANDRA_HTM102 (2006)
    PANGAEA
    In:  Supplement to: van Breugel, Yvonne; Baas, Marianne; Schouten, Stefan; Mattioli, Emanuela; Sinninghe Damsté, Jaap S (2006): Isorenieratane record in black shales from the Paris Basin, France: Constraints on recycling of respired CO2 as a mechanism for negative carbon isotope shifts during the Toarcian oceanic anoxic even. Paleoceanography, 21(4), PA4220, https://doi.org/10.1029/2006PA001305
    Details
    Publication Date: 2023-08-04
    Description: The prominent negative stable carbon isotope excursion in both carbonate and organic carbon recorded in organic-rich sediments deposited during the Toarcian oceanic anoxic event (OAE) has commonly been explained by recycling of 13C-depleted CO2 (the so-called Küspert model). More recently, the massive release of 13C-depleted methane or other forms of 13C-depleted carbon was also proposed to account for the observed negative d13C excursions in organic carbon of terrigenous as well as of marine origin. The occurrence of diagenetic products of the carotenoid isorenieratene (isorenieratane and other aryl isoprenoids) in Toarcian black shales has been regarded as supporting evidence for the Küspert hypothesis as they point to strong stratification of the epicontinental seas. A section of a drill core straddling the Toarcian of the Paris Basin (Cirfontaine-en-Ornois) contained intact isorenieratane, providing evidence that photosynthetic green sulphur bacteria were present at the time of deposition, even prior to the OAE. However, the isorenieratane abundances are very low in the section where the negative d13C excursion in organic carbon and phytane, a chemical fossil derived from chlorophyll, occurs. The abundance of the isorenieratene derivatives increases, once the d13C records have shifted to more positive values. The d13C of isorenieratane (generally circa -13.1 ± 0.5 per mil) indicates that the respired CO2 contribution at the chemocline was low and is thus not likely to be the main cause of the prominent up to 7per mil negative d13C shift recorded in Toarcian organic carbon records.
    Keywords: -; ANDRA_HTM102; Calculated; DEPTH, sediment/rock; DRILL; Drilling/drill rig; France; Isorenieratane, δ13C; Isorenieratane, δ13C, standard deviation; Isotope ratio monitoring (IRM) mass spectrometry; Mass spectrometer Finnigan Delta Plus; δ13C, carbon dioxide, aquatic; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 65 data points
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  • 18
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    Reconstruction of continental mean air temperature across the PETM of IODP Hole 302-M0004A (Appendix A) (2007)
    PANGAEA
    In:  Supplement to: Weijers, Johan W H; Schouten, Stefan; Sluijs, Appy; Brinkhuis, Henk; Sinninghe Damsté, Jaap S (2007): Warm arctic continents during the Palaeocene-Eocene thermal maximum. Earth and Planetary Science Letters, 261(1-2), 230-238, https://doi.org/10.1016/j.epsl.2007.06.033
    Details
    Publication Date: 2023-11-01
    Description: The Palaeocene-Eocene Thermal Maximum (PETM; ~55.5 Ma) is a geologically relatively brief episode of extreme warmth. Both deep and surface ocean temperatures increased by up to 5 °C in equatorial waters and up to 8 °C in mid and high latitude waters. From the continents, the annual mean air temperature response during the PETM is still largely unknown, mainly due to a lack of quantitative temperature proxies and sufficient suitable, continuous high resolution records. Recently, a new proxy for continental temperature reconstructions has been proposed, based on the distribution of membrane lipids of bacteria in present-day soils [Weijers et al., 2007, doi:10.1016/j.gca.2006.10.003] and shown to reconstruct annual mean air temperature. In this study we applied this new proxy in an attempt to reconstruct the air temperature in high latitude continental areas during the PETM by analysis of a marine sedimentary sequence obtained from the Lomonosov Ridge in the central Arctic Ocean (Integrated Ocean Drilling Program Expedition 302, Site 004, Hole A). The results indicate a warming of ~8 °C above background values of ~17 °C. This warming is coincident with a similar rise in sea surface temperatures documented earlier. Our results thus further confirm the warm conditions in the Arctic, and point to a strongly reduced latitudinal temperature gradient during the PETM.
    Keywords: 302-M0004A; ACEX-M4A; Arctic Coring Expedition, ACEX; Arctic Ocean; Calculated; CCGS Captain Molly Kool (Vidar Viking); Counting 〉15 µm fraction; Cyclization ratio of branched tetraethers; DEPTH, sediment/rock; DSDP/ODP/IODP sample designation; Exp302; High Performance Liquid Chromatography - Mass spectrometry (HPLC-MS); Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Methylation index of branched tetraethers; Osmundaceae; Sample code/label; Temperature, annual mean
    Type: Dataset
    Format: text/tab-separated-values, 219 data points
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  • 19
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    (Table S1) Palynology of IODP Hole 302-M0004A (2006)
    PANGAEA
    In:  Supplement to: Sluijs, Appy; Schouten, Stefan; Pagani, Mark; Woltering, Martijn; Brinkhuis, Henk; Sinninghe Damsté, Jaap S; Dickens, Gerald Roy; Huber, Matthew; Reichart, Gert-Jan; Stein, Ruediger; Matthiessen, Jens; Lourens, Lucas Joost; Pedentchouk, Nikolai; Backman, Jan; Moran, Kathryn; Expedition 302 Scientists (2006): Subtropical Arctic Ocean temperatures during the Palaeocene/Eocene thermal maximum. Nature, 441, 610-613, https://doi.org/10.1038/nature04668
    Details
    Publication Date: 2023-07-10
    Description: The Palaeocene/Eocene thermal maximum, 55 million years ago, was a brief period of widespread, extreme climatic warming (Zachos et al., 2003; Kennett and Stott, 1991, doi:10.1038/353225a0; Tripati and Elderfield, 2005, doi:10.1126/science.1109202), that was associated with massive atmospheric greenhouse gas input (Dickens et al., 1995, doi:10.1029/95PA02087). Although aspects of the resulting environmental changes are well documented at low latitudes, no data were available to quantify simultaneous changes in the Arctic region. Here we identify the Palaeocene/Eocene thermal maximum in a marine sedimentary sequence obtained during the Arctic Coring Expedition (Backman et al., 2006, doi:10.2204/iodp.proc.302.2006). We show that sea surface temperatures near the North Pole increased from 18 °C to over 23 °C during this event. Such warm values imply the absence of ice and thus exclude the influence of ice-albedo feedbacks on this Arctic warming. At the same time, sea level rose while anoxic and euxinic conditions developed in the ocean's bottom waters and photic zone, respectively. Increasing temperature and sea level match expectations based on palaeoclimate model simulations (Shellito et al., 2003, doi:10.1016/S0031-0182(02)00718-6), but the absolute polar temperatures that we derive before, during and after the event are more than 10 °C warmer than those model-predicted. This suggests that higher-than-modern greenhouse gas concentrations must have operated in conjunction with other feedback mechanisms -perhaps polar stratospheric clouds (Sloan and Pollard, 1998, doi:10.1029/98GL02492) or hurricane-induced ocean mixing (Emanuel et al., 2004, doi:10.1175/1520-0469(2004)061〈0843:ECOTCI〉2.0.CO;2)- to amplify early Palaeogene polar temperatures.
    Keywords: 302-M0004A; ACEX-M4A; Angiosperms; Apectodinium spp.; Arctic Coring Expedition, ACEX; Arctic Ocean; Areoligera complex; Caligodinium aceras; CCGS Captain Molly Kool (Vidar Viking); Cerodinium complex; Cordosphaeridium complex; DEPTH, sediment/rock; Dinoflagellate cyst; Dinoflagellate cyst, low salinity tolerant; Dinoflagellate cyst indeterminata; DSDP/ODP/IODP sample designation; Exp302; Foraminifera, linings per unit mass; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Membranosphaera complex; Palynomorpha, marine; Palynomorpha, terrestrial; Pollen, angiosperms; Pollen, gymnosperms; Polysphaeridium complex; Sample code/label; Senegalinium spp.; Spiniferites complex; Spores
    Type: Dataset
    Format: text/tab-separated-values, 1185 data points
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  • 20
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    Cenomanian/Turonian sea surface temperatures of the equatorial Atlantic reconstructed from geochemical data (2007)
    PANGAEA
    In:  Supplement to: Forster, Astrid; Schouten, Stefan; Moriya, Kazuyoshi; Wilson, Paul A; Sinninghe Damsté, Jaap S (2007): Tropical warming and intermittent cooling during the Cenomanian/Turonian oceanic anoxic event 2: Sea surface temperature records from the equatorial Atlantic. Paleoceanography, 22(1), PA1219, https://doi.org/10.1029/2006PA001349
    Details
    Publication Date: 2024-01-09
    Description: Oceanic anoxic event 2 (OAE-2) occurring during the Cenomanian/Turonian (C/T) transition is evident from a globally recognized positive stable carbon isotopic excursion and is thought to represent one of the most extreme carbon cycle perturbations of the last 100 Myr. However, the impact of this major perturbation on and interaction with global climate remains unclear. Here we report new high-resolution records of sea surface temperature (SST) based on TEX86 and d 18O of excellently preserved planktic foraminifera and stable organic carbon isotopes across the C/T transition from black shales located offshore Suriname/French Guiana (Demerara Rise, Ocean Drilling Program Leg 207 Site 1260) and offshore Senegal (Cape Verde Basin, Deep Sea Drilling Project Leg 41 Site 367). At Site 1260, where both SST proxy records can be determined, a good match between conservative SST estimates from TEX86 and d 18O is observed. We find that late Cenomanian SSTs in the equatorial Atlantic Ocean (33°C) were substantially warmer than today (27°-29°C) and that the onset of OAE-2 coincided with a rapid shift to an even warmer (35°-36°C) regime. Within the early stages of the OAE a marked (4°C) cooling to temperatures lower than pre-OAE conditions is observed. However, well before the termination of OAE-2 the warm regime was reestablished and persisted into the Turonian. Our findings corroborate the view that the C/T transition represents the onset of the interval of peak Cretaceous warmth. More importantly, they are consistent with the hypotheses that mid-Cretaceous warmth can be attributed to high levels of atmospheric carbon dioxide (CO2) and that major OAEs were capable of triggering global cooling through the negative feedback effect of organic carbon-burial-led CO2 sequestration. Evidently, however, the factors that gave rise to the observed shift to a warmer climate regime at the onset of OAE-2 were sufficiently powerful that they were only briefly counterbalanced by the high rates of carbon burial attained during even the most extreme interval of organic carbon burial in the last 100 Myr.
    Keywords: 207-1260A; 207-1260B; 41-367; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Joides Resolution; Leg207; Leg41; North Atlantic/BASIN; Ocean Drilling Program; ODP; South Atlantic Ocean
    Type: Dataset
    Format: application/zip, 3 datasets
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