GLORIA

GEOMAR Library Ocean Research Information Access

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
Document type
Keywords
Publisher
Language
Years
  • 1
    Online Resource
    Online Resource
    Abrupt Climate Change : Mechanisms, Patterns, and Impacts. (2011)
    Newark :American Geophysical Union,
    Details
    Keywords: Climatic changes. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (251 pages)
    Edition: 1st ed.
    ISBN: 9781118671528
    Series Statement: Geophysical Monograph Series ; v.193
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=1184588
    DDC: 551.6
    Language: English
    Note: Intro -- Title Page -- Contents -- Preface -- Abrupt Climate Change Revisited -- A Review of Abrupt Climate Change Events in the Northeastern Atlantic Ocean (Iberian Margin): Latitudinal, Longitudinal, and Ver -- Laurentide Ice Sheet Meltwater and the Atlantic Meridional Overturning Circulation During the Last Glacial Cycle: A View From th -- Modeling Abrupt Climate Change as the Interaction Between Sea Ice Extent and Mean Ocean Temperature Under Orbital Insolation For -- Simulated Two-Stage Recovery of Atlantic Meridional Overturning Circulation During the Last Deglaciation -- The Role of Hudson Strait Outlet in Younger Dryas Sedimentation in the Labrador Sea -- Challenges in the Use of Cosmogenic Exposure Dating of Moraine Boulders to Trace the Geographic Extents of Abrupt Climate Change -- Hypothesized Link Between Glacial/Interglacial Atmospheric CO2 Cycles and Storage/Release of CO2-Rich Fluids From Deep-Sea Sedim -- The Impact of the Final Lake Agassiz Flood Recorded in Northeast Newfoundland and Northern Scotian Shelves Based on Century-Scal -- The 1500 Year Quasiperiodicity During the Holocene -- Abrupt Climate Changes During the Holocene Across North America From Pollen and Paleolimnological Records -- Abrupt Holocene Climatic Change in Northwestern India: Disappearance of the Sarasvati River and the End of Vedic Civilization -- Evidence for Climate Teleconnections Between Greenland and the Sierra Nevada of California During the Holocene, Including the 82 -- Abrupt Climate Change: A Paleoclimate Perspective From the World's Highest Mountains -- AGU Category Index -- Index.
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    GEOMAR EBL
  • 2
    facet.materialart.
    Unknown
    (Table 3) Estimated concentrations of aromatic biomarkers and selected aromatic hydrocarbons ratios
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: C28S triaromatic steroid; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Elevation of event; Event label; EW9303-1; HU90-013-029; HU90-013-029TWC; HUD90/13; Hudson; Isorenieratane, per unit sediment mass; JPC; Jumbo Piston Core; Labrador Sea; Latitude of event; Longitude of event; Palaerenieratane, per unit sediment mass; PC; Piston corer; Ratio; Secohopanoids, per unit sediment mass; Sediment type; Steroids, total per unit sediment mass; TC; Trigger corer; VM23-14; VM23-16; VM28-89
    Type: Dataset
    Format: text/tab-separated-values, 429 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 3
    facet.materialart.
    Unknown
    (Table 2) Estimated concentrations of total hopanes and total steranes and selected hopanes and steranes ratios
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: C27 sterane; C28 sterane; C29 sterane; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Elevation of event; Event label; EW9303-1; Hopane, total; HU90-013-029; HU90-013-029TWC; HUD90/13; Hudson; JPC; Jumbo Piston Core; Labrador Sea; Latitude of event; Longitude of event; PC; Piston corer; Ratio; Sediment type; Steranes, total; TC; Trigger corer; VM23-14; VM23-16; VM28-89
    Type: Dataset
    Format: text/tab-separated-values, 570 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 4
    facet.materialart.
    Unknown
    Biomarker in Heinrich event layers
    PANGAEA
    In:  Supplement to: Rashid, Harunur; Grosjean, Emmanuelle (2006): Detecting the source of Heinrich layers: An organic geochemical study. Paleoceanography, 21(3), PA3014, https://doi.org/10.1029/2005PA001240
    Details
    Publication Date: 2023-05-12
    Description: There are controversies regarding the origin of Heinrich layer 3 (H3), the massive ice-rafting and meltwater event in the North Atlantic during the last glacial cycle spanning a time window between 29 and 30 kyr B.P. Some argue in favor of a Laurentide Ice Sheet source similar to other Heinrich layers, while a contending view argues for the European ice sheet source. Existing geochemical proxies such as 40Ar/39Ar, 206Pb/204Pb, or epsilon-Nd, etc., could not be used to distinguish among various sources of ice-rafted debris in H3 because of their low abundances, suggesting a background glacial sediment signal. In order to circumvent this problem a biomarker-based approach is used to characterize the provenance of H layers 2, 3, and 4 and other non-Heinrich layers. The presence of hopanes and steranes and their aromatic counterparts in the H layers is incompatible with Recent sediments and is attributed to the transportation of organic matter because of the glacial erosion of source rocks. The most diagnostic and useful signatures of this ancient organic matter in the H layers are the dominance of C34 hopanoids over C33 and the occurrence of isorenieratane along with palaerenieratane. Biomarkers signatures in H layers 2 and 3 of the Labrador Sea suggest no difference in their source. Hydrocarbon distributions suggest that these sediments were derived from the Middle to Late Ordovician and Silurian source rocks of the Hudson Bay of eastern Canada. Biomarker data of the H layer 4 from the northwest Atlantic reveal that the sediments of this layer have a similar source to the H layers in the Labrador Sea.
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 5
    facet.materialart.
    Unknown
    (Table 2) Radiocarbon age determination from the polar planktonic foraminifera Neogloboquadrina pachyderma s for sediment core HU90-013-029 (2003)
    PANGAEA
    In:  Supplement to: Rashid, Harunur; Hesse, Reinhard; Piper, David J W (2003): Evidence for an additional Heinrich event between H5 and H6 in the Labrador Sea. Paleoceanography, 18(4), 1077, https://doi.org/10.1029/2003PA000913
    Details
    Publication Date: 2023-12-02
    Description: An additional Heinrich ice-rafting event is identified between Heinrich events 5 and 6 in eight cores from the Labrador Sea and the northwest Atlantic Ocean. It is characterized by sediment rich in detrital carbonate (40% CaCO3) with high concentration of floating dropstones, high coarse-fraction (% 〉 150 µm) content, and has a sharp contact with the underlying but grades into the overlying hemipelagic sediment. It also shows lighter d18ONpl values, indicating freshening due to iceberg rafting and/or meltwater discharge. This event is correlated with Dansgaard-Oeschger event 14 and interpreted as an additional Heinrich event, H5a. The thickness of H5a in the Labrador Sea reaches up to 220 cm. This additional Heinrich event has also been reported in cores PS2644 and SO82-5 from the northern North Atlantic. With the recognition of H5a the temporal spacing between Heinrich events 1 to 6 becomes more uniform (~7 ka).
    Keywords: Age, 14C AMS; Age, 14C calibrated; Age, dated; Age, dated material; Age, dated standard error; Calendar age; DEPTH, sediment/rock; HU90-013-029; HUD90/13; Hudson; Laboratory code/label; Labrador Sea; PC; Piston corer; Sample mass
    Type: Dataset
    Format: text/tab-separated-values, 78 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 6
    facet.materialart.
    Unknown
    Deconvolving the saturation state and temperature controls on benthic foraminiferal Li/Ca, based on downcore paired B/Ca measurements and coretop compilation (2018)
    Elsevier
    In:  Geochimica et Cosmochimica Acta, 236 . pp. 297-314.
    Details
    Publication Date: 2021-02-08
    Description: Li/Ca in calcitic benthic foraminiferal tests has been suggested to co-vary with both temperature and carbonate chemistry, but these two influences have been difficult to disentangle. We use several new downcore records of Li/Ca in Cibicidoides wuellerstorfi and Uvigerina, paired with the carbonate proxy B/Ca, to further elucidate this behavior. We also combine the downcore measurements with a compilation of coretop Li/Ca data. Uvigerina B/Ca presumably records pore water saturation with respect to calcite (ΔCO32−), though downcore data show that it partially reflects bottom water ΔCO32− (inferred from C. wuellerstorfi B/Ca), with a relationship that is consistent with a previous global coretop calibration. Downcore Li/Ca is significantly correlated to B/Ca in both taxa, implying a positive relationship between Li/Ca and carbonate chemistry. This connection breaks down in the coretop compilation however, likely due to the confounding influence of temperature on Li/Ca. We attempt to isolate the temperature influence using a negative exponential equation previously derived from abiotic calcite precipitation experiments, and introduce a new quantity ΔLi/Ca, which is the observed departure from the temperature-based prediction. This transformation brings the downcore and coretop Li/Ca measurements into alignment, with up to 90% of the ΔLi/Ca variance explained by ΔCO32−. Finally, we perform preliminary tests of Li/Ca as a paleo-proxy for both ΔCO32− and temperature.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.gca.2018.02.029
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
    facet.materialart.
    Unknown
    Changes in Indian Summer Monsoon Using Neodymium (Nd) Isotopes in the Andaman Sea During the Last 24,000 years (2019)
    Springer
    In:  Earth Systems and Environment, 3 (2). pp. 241-253.
    Details
    Publication Date: 2022-01-31
    Description: Dramatic changes from a cold and dry last glacial to a warm and wet Holocene period intensified the Indian summer monsoon (ISM), resulting in vigorous hydrology and increased terrestrial erosion. Here we present seawater neodymium (Nd) data (expressed in εNd) from Andaman Sea sediments to assess past changes in the ISM and the related impact of Irrawaddy–Salween and Sittoung (ISS) river discharge into the Andaman Sea in the northeastern Indian Ocean. Four major isotopic changes were identified: (1) a gradual increase in εNd toward a more radiogenic signature during the Last Glacial Maximum (22–18 ka), suggesting a gradual decrease in the ISS discharge; (2) a relatively stable radiogenic seawater εNd between 17.2 and 8.8 ka, perhaps related to a stable reduced outflow; (3) a rapid transition to less radiogenic εNd signature after 8.8 ka, reflecting a very wet early–mid-Holocene with the highest discharge; and (4) a decrease in εNd signal stability in the mid–late Holocene. Taking into account the contribution of the ISS rivers to the Andaman Sea εNd signature that changes proportionally with the strengthening (less radiogenic εNd) or weakening (more radiogenic εNd) of the ISM, we propose a binary model mixing between the Salween and Irrawaddy rivers to explain the εNd variability in Andaman Sea sediments. We hypothesize that the Irrawaddy river mainly contributed detrital sediment to the northeastern Andaman Sea for the past 24 ka. Our εNd data shed new light on the regional changes in Indo-Asian monsoon systems when compared with the existing Indian and Chinese paleo-proxy records.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.1007/s41748-019-00105-0
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 8
    facet.materialart.
    Unknown
    Reconstructing organic matter sources and rain rates in the southern West Pacific Warm Pool during the transition from the deglaciation period to early Holocene (2019)
    Elsevier
    In:  Chemical Geology, 529 (Article number 119291).
    Details
    Publication Date: 2022-01-31
    Description: Highlights • δ13C, δ15N, and TOC/TN of POM suggest that the POM is characterized by a mixture of marine and terrestrial origins. • Hindcast model results revealed a major decrease in POC rain rate during the deglaciation–early Holocene transition. • The decrease in POC rain rate was induced by the decline in the terrestrial OM input associated with rapid sea level rise. Abstract Transient features in the organic carbon content of deep-sea sediment cores resulting from changes in the flux and/or quality of organic matter input are not uncommon. We examined the geochemical characteristics of sediments retrieved with a gravity core from the northwestern Solomon Sea (3908 m water depth), southern West Pacific Warm Pool (WPWP). δ13C and δ15N of sedimentary organic matter, together with TOC/TN data suggest that the organic material is characterized by a mixture of marine and terrestrial origins with a higher contribution from marine algae. The data were analyzed with an inverse non-steady-state reaction-transport model to examine the magnitude and variability of particulate organic carbon (POC) flux to the seafloor during the transition between the deglaciation period and early Holocene. Measured POC content and porewater NO3−, NH4+, DIC and SO42− concentrations were used to constrain the model. Hindcast results revealed that POC flux decreased from 75 to 37.5 μg cm−2 yr−1 during the deglaciation–early Holocene transition. The rate of POC degradation in the present setting is slightly lower compared to that in the pre-Holocene setting. The synchronous decline in the relative contribution of terrestrial organic matter input and rapid sea level rise during this transition suggest that sea level, rather than surface productivity, is the dominant factor controlling the POC deposition flux in the Solomon Sea. This is conceivable because the sampling site is proximal to high-relief islands with high rainfall, a well-developed submarine canyon system and narrow and steep continental margins. Consequently, we suggest that deep-water basins in proximity to similar high-relief mountainous islands in the tropical Pacific may represent important sinks for terrestrial organic material, especially during sea level lowstands.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.1016/j.chemgeo.2019.119291
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
    facet.materialart.
    Unknown
    Distribution, source and burial of sedimentary organic carbon in Kermadec and Atacama trenches (2021)
    American Geophysical Union.
    In:  EPIC3Journal of Geophysical Research: Biogeosciences, American Geophysical Union., 126, pp. e2020JG006189.
    Details
    Publication Date: 2021-11-10
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 10
    facet.materialart.
    Unknown
    Vibrio and Bacterial Communities Across a Pollution Gradient in the Bay of Bengal: Unraveling Their Biogeochemical Drivers (2020)
    Frontiers
    In:  EPIC3Frontiers in Microbiology, Frontiers, 11, pp. 1-16, ISSN: 1664-302X
    Details
    Publication Date: 2023-06-21
    Description: The highly populated coasts of the Bay of Bengal are particularly vulnerable to water-borne diseases, pollution and climatic extremes. The environmental factors behind bacterial community composition and Vibrio distribution were investigated in an estuarine system of a cholera-endemic region in the coastline of Bangladesh. Higher temperatures and sewage pollution were important drivers of the abundance of toxigenic Vibrio cholerae. A closer relation between non-culturable Vibrio and particulate organic matter (POM) was inferred during the post-monsoon. The distribution of operational taxonomic units (OTUs) of Vibrio genus was likely driven by salinity and temperature. The resuspension of sediments increased Vibrio abundance and organic nutrient concentrations. The d13C dynamic in POM followed an increasing gradient from freshwater to marine stations; nevertheless, it was not a marker of sewage pollution. Bacteroidales and culturable coliforms were reliable indicators of untreated wastewater during pre and post-monsoon seasons. The presumptive incorporation of depletedammonium derived from ammonification processes under the hypoxic conditions, by some microorganisms such as Cloacibacterium and particularly by Arcobacter nearby the sewage discharge, contributed to the drastic 15N depletion in the POM. The likely capacity of extracellular polymeric substances production of these taxa may facilitate the colonization of POM from anthropogenic origin and may signify important properties for wastewater bioremediation. Genera of potential pathogens other than Vibrio associated with sewage pollution were Acinetobacter, Aeromonas, Arcobacter, and Bergeyella. The changing environmental conditions of the estuary favored the abundance of early colonizers and the island biogeography theory explained the distribution of some bacterial groups. This multidisciplinary study evidenced clearly the eutrophic conditions of the Karnaphuli estuary and assessed comprehensively its current bacterial baseline and potential risks. The prevailing conditions together with human overpopulation and frequent natural disasters, transform the region in one of the most vulnerable to climate change. Adaptive management strategies are urgently needed to enhance ecosystem health.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER (OA)
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...