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  • 1
    Buch
    Buch
    Geologic and tectonic development of the Caribbean plate boundary in Northern Central America (2007)
    Boulder, Colo. : Geological Society of America
    Details Verfügbarkeit
    Schlagwort(e): Geology ; Geology ; Plate tectonics ; Plate tectonics ; Aufsatzsammlung ; Karibische Platte ; Geologie ; Platte ; Deformation ; Plattentektonik ; Karibische Platte ; Geologie ; Platte ; Deformation ; Plattentektonik
    Materialart: Buch
    Seiten: V,179 S. , Ill., graph. Darst., Kt.
    ISBN: 9780813724287
    Serie: Special paper 428
    DDC: 557.28
    RVK:
    TG 4000
    Sprache: Englisch
    Anmerkung: Literaturangaben
    Standort Signatur Einschränkungen Verfügbarkeit
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    GEOMAR KATALOG
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  • 2
    Buch
    Buch
    Geologic and tectonic development of the North America-Caribbean plate boundary in Hispaniola (1991)
    Boulder, Colo. : Geological Society of America
    Details Verfügbarkeit
    Schlagwort(e): island arcs ; plate tectonics ; geology ; Hispaniola ; Hispaniola ; Geologie ; Tektonik ; Karibik ; Plattentektonik ; Hispaniola ; Geologie ; Tektonik ; Karibik ; Plattentektonik
    Materialart: Buch
    Seiten: xx, 401 p , Ill., graph. Darst., Kt , 8 Kt.-Beil , 27 cm
    ISBN: 0813722624
    Serie: Special paper / Geological Society of America 262
    DDC: 557.293
    RVK:
    RV 50121
    Sprache: Englisch
    Anmerkung: Includes bibliographical references and index
    Standort Signatur Einschränkungen Verfügbarkeit
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    GEOMAR KATALOG
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  • 3
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    Specific microbial biomarker signatures from Congo fan sediments of ODP site 175-1075, Congo soils, wetland and estuary sediments (2014)
    PANGAEA
    In:  Supplement to: Talbot, Helen M; Handley, Luke; Spencer-Jones, Charlotte L; Dinga, Bienvenu Jean; Schefuß, Enno; Mann, Paul James; Poulsen, John R; Spencer, Robert GM; Wabakanghanzi, Jose N; Wagner, Thomas (2014): Variability in aerobic methane oxidation over the past 1.2Myrs recorded in microbial biomarker signatures from Congo fan sediments. Geochimica et Cosmochimica Acta, 133, 387-401, https://doi.org/10.1016/j.gca.2014.02.035
    Details
    Publikationsdatum: 2024-02-02
    Beschreibung: Methane (CH4) is a strong greenhouse gas known to have perturbed global climate in the past, especially when released in large quantities over short time periods from continental or marine sources. It is therefore crucial to understand and, if possible, quantify the individual and combined response of these variable methane sources to natural climate variability. However, past changes in the stability of greenhouse gas reservoirs remain uncertain and poorly constrained by geological evidence. Here, we present a record from the Congo fan of a highly specific bacteriohopanepolyol (BHP) biomarker for aerobic methane oxidation (AMO), 35-aminobacteriohopane-30,31,32,33,34-pentol (aminopentol), that identifies discrete periods of increased AMO as far back as 1.2 Ma. Fluctuations in the concentration of aminopentol, and other 35-aminoBHPs, follow a pattern that correlates with late Quaternary glacial-interglacial climate cycles, with highest concentrations during warm periods. We discuss possible sources of aminopentol, and the methane consumed by the precursor methanotrophs, within the context of the Congo River setting, including supply of methane oxidation markers from terrestrial watersheds and/or marine sources (gas hydrate and/or deep subsurface gas reservoir). Compound-specific carbon isotope values of -30 per mil to -40 per mil for BHPs in ODP 1075 and strong similarities between the BHP signature of the core and surface sediments from the Congo estuary and floodplain wetlands from the interior of the Congo River Basin, support a methanotrophic and likely terrigenous origin of the 35-aminoBHPs found in the fan sediments. This new evidence supports a causal connection between marine sediment BHP records of tropical deep sea fans and wetland settings in the feeding river catchments, and thus tropical continental hydrology. Further research is needed to better constrain the different sources and pathways of methane emission. However, this study identifies the large potential of aminoBHPs, in particular aminopentol, to trace and, once better calibrated and understood, quantify past methane sources and fluxes from terrestrial and potentially also marine sources.
    Schlagwort(e): Center for Marine Environmental Sciences; MARUM; Ocean Drilling Program; ODP
    Materialart: Dataset
    Format: application/zip, 3 datasets
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 4
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    (Table S1) Total organic carbon and concentration of C-35 aminoBHPs in ODP Site 175-1075 Congo Fan sediments (2014)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-02
    Schlagwort(e): 175-1075; Aminopentol, per unit mass total organic carbon; Aminopentol isomer, per unit mass total organic carbon; Aminotetrol, per unit mass total organic carbon; Aminotriol, per unit mass total organic carbon; Benguela Current, South Atlantic Ocean; Carbon, organic, total; COMPCORE; Composite Core; Depth, composite; DEPTH, sediment/rock; Joides Resolution; Leg175; Ocean Drilling Program; ODP
    Materialart: Dataset
    Format: text/tab-separated-values, 630 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 5
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    (Table 1) Selected samples from ODP Site 175-1075 subjected to compound specific stable carbon isotope analysis (2014)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-02
    Schlagwort(e): 175-1075; AGE; Benguela Current, South Atlantic Ocean; C30-Hopanol; C30-Hopanol, δ13C; C31-Hopanol; C31-Hopanol, δ13C; C32-Hopanol; C32-Hopanol, δ13C; COMPCORE; Composite Core; Gas chromatography-combustion-isotope ratio mass spectrometry (GC-C-IRMS); Joides Resolution; Leg175; Ocean Drilling Program; ODP; Sample code/label; Standard deviation
    Materialart: Dataset
    Format: text/tab-separated-values, 67 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 6
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    (Table S2) Total organic carbon and concentration of C-35 aminoBHPs in Congo soils, wetland and Estuary sediments (2014)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-02
    Schlagwort(e): Aminopentol, per unit mass total organic carbon; Aminopentol isomer, per unit mass total organic carbon; Aminotetrol, per unit mass total organic carbon; Aminotriol, per unit mass total organic carbon; Anker24; Area/locality; Carbon, organic, total; Center for Marine Environmental Sciences; DEPTH, sediment/rock; Elevation of event; Event label; Grab; GRAB; Latitude of event; Longitude of event; MARUM; Sample comment
    Materialart: Dataset
    Format: text/tab-separated-values, 174 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 7
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    Organic matter characteristics using lipid biomarker analysis of a rapidly eroding permafrost cliff (2021)
    PANGAEA
    Details
    Publikationsdatum: 2024-05-07
    Beschreibung: Organic carbon (OC) stored in Arctic permafrost represents one of Earth's largest and most vulnerable terrestrial carbon pools. Amplified climate warming across the Arctic results in widespread permafrost thaw. Permafrost deposits exposed at river cliffs and coasts are particularly susceptible to thawing processes. Accelerating erosion of terrestrial permafrost along shorelines leads to increased transfer of organic matter (OM) to nearshore waters. However, the amount of terrestrial permafrost carbon and nitrogen as well as the OM quality in these deposits are still poorly quantified. Here, we characterise the sources and the quality of OM supplied to the Lena River at a rapidly eroding permafrost river shoreline cliff in the eastern part of the delta (Sobo-Sise Island). Our multi-proxy approach captures bulk elemental, molecular geochemical and carbon isotopic analyses of late Pleistocene Yedoma permafrost and Holocene cover deposits, discontinuously spanning the last ~52 ka. We show that the ancient permafrost exposed in the Sobo-Sise cliff has a high organic carbon content (mean of about 5 wt%).We found that the OM quality, which we define as the intrinsic potential to further transformation, decomposition, and mineralization, is also high as inferred by the lipid biomarker inventory. The oldest sediments stem from Marine Isotope Stage (MIS) 3 interstadial deposits (dated to 52 to 28 cal kyr BP) and is overlaid by Last Glacial MIS 2 (dated to 28 to 15 cal ka BP) and Holocene MIS 1 (dated to 7–0 cal ka BP) deposits. The relatively high average chain length (ACL) index of n-alkanes along the cliff profile indicates a predominant contribution of vascular plants to the OM composition. The elevated ratio of iso and anteiso-branched FAs relative to long chain (C ≥ 20) n-FAs in the interstadial MIS 3 and the interglacial MIS 1 deposits, suggests stronger microbial activity and consequently higher input of bacterial biomass during these climatically warmer periods. The overall high carbon preference index (CPI) and higher plant fatty acid (HPFA) values as well as high C / N ratios point to a good quality of the preserved OM and thus to a high potential of the OM for decomposition upon thaw. A decrease of HPFA values downwards along the profile probably indicates a relatively stronger OM decomposition in the oldest (MIS 3) deposits of the cliff.
    Schlagwort(e): Biomarker; CACOON; Carbon; Changing Arctic Carbon cycle in the cOastal Ocean Near-shore; erosion; n-alkane; n-fatty acids; Siberia; Yedoma
    Materialart: Dataset
    Format: application/zip, 4 datasets
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 8
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    Total suspended matter, particulate organic carbon and its isotopic composition in the Lena River and its Delta (2022)
    PANGAEA
    Details
    Publikationsdatum: 2024-05-07
    Beschreibung: Total Suspended Matter (TSM), Particulate Organic Carbon (POC) and its isotopic composition were measured in water samples from the Lena River and its Delta (Sardakhskaya branch). Samples were taken in summer 2019 during the CACOON expedition (Fuchs et al., 2021a, b and 2022) along ~ 1600 km transect from Yakutsk downstream to the Lena Delta disembogue into the Laptev Sea. Water was filtered through pre-combusted (4.5 hours, 450 °C) and pre-weighed glass fiber filters (GF/F Whatman, 0.75 µm membrane, Ø 2.5 cm) for TSM content (difference in weights between dried filters with TSM and pre-weighed empty filters), POC concentration and δ13C-POC (Sercon 20-20 isotope ratio mass spectrometer coupled to an Automated Nitrogen Carbon Analyzer), ∆14C-POC analysis (accelerator mass spectrometer achieved on a Mini Carbon Dating System) and relative OC content in TSM (calculated by dividing the sample POC content by the TSM content). Our aim was to characterize POC along the Lena River over a transect from upper reaches of the Lena River north to the Lena delta in order to decipher the distribution, main sources, and transformation of POC on its way from the permafrost catchment to the Arctic Ocean.
    Schlagwort(e): 13C-POC; 14C-POC; Accelerator mass spectrometry, Ionplus, Mini Carbon Dating System (MiCaDaS AWI); AWI Arctic Land Expedition; CACOON; Carbon, organic, fraction; Carbon, organic, particulate; Changing Arctic Carbon cycle in the cOastal Ocean Near-shore; Continuous flow isotope ratio mass spectrometer, Sercon, 20-20; coupled with Automated nitrogen carbon analyzer; DATE/TIME; DEPTH, water; Event label; LATITUDE; LEN19-S-01; LEN19-S-02; LEN19-S-03; LEN19-S-04; LEN19-S-05; LEN19-S-06; LEN19-S-07; LEN19-S-08; LEN19-S-09; LEN19-S-78; LEN19-S-89; Lena 2019; Lena Delta; Lena Delta, Siberia; Lena River; LONGITUDE; MULT; Multiple investigations; POC; RU-Land_2019_Lena; Sardakhskaya; Suspended matter, total; TSM; Water sample; WL19-1; WL19-2; WL19-3; WL19-4; WL19-5; WL19-6; WL19-7; WL19-8; WL19-9; WS; Δ14C, particulate organic carbon; δ13C, particulate organic carbon
    Materialart: Dataset
    Format: text/tab-separated-values, 155 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 9
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    Dissolved and Particulate Organic Carbon and its isotopic composition in the Lena Delta in winter 2019 and in summer 2019, 2017 and 2016 (2023)
    PANGAEA
    Details
    Publikationsdatum: 2024-05-07
    Beschreibung: Dissolved and particulate Organic Carbon (DOC and POC) and their isotopic composition were measured in water samples from the Lena Delta (Sardakhskaya branch). Samples were taken in winter (April) and summer (August) 2019 during the CACOON expedition (Fuchs et al., 2021a, b and 2022) and in the summer 2017 and 2016 during previous Lena Delta sampling campaigns. Water was filtered through pre-combusted (4.5 hours, 450 °C) and pre-weighed glass fiber filters (GF/F Whatman, 0.75 µm membrane, Ø 2.5 cm) for DOC analyses, filters with rest suspended matter on it were used to analyse POC. δ13C of DOC and POC was measured by Sercon 20-20 isotope ratio mass spectrometer coupled to an Automated Nitrogen Carbon Analyzer, ∆14C of DOC and POC by accelerator mass spectrometer achieved on a Mini Carbon Dating System. Our aim was to highlight the variability in quantity and composition between seasons and suggest that permafrost deposits are degrading year around, impacting the release of organic matter through the Lena Delta.
    Schlagwort(e): 13C-DOC; 13C-POC; 14C-DOC; 14C-POC; Accelerator mass spectrometry, Ionplus, Mini Carbon Dating System (MiCaDaS AWI); AWI Arctic Land Expedition; CAC19-01; CAC19-02; CAC19-03; CAC19-04; CAC19-23; CAC19-A; CAC19-B; CAC19-C; CAC19-D; CAC19-E; CAC19-F; CAC19-G; CAC19-H; CACOON; Carbon, organic, dissolved; Carbon, organic, particulate; Changing Arctic Carbon cycle in the cOastal Ocean Near-shore; Continuous flow isotope ratio mass spectrometer, Sercon, 20-20; coupled with Automated nitrogen carbon analyzer; DATE/TIME; DEPTH, water; DOC; Event label; L16-06; L16-07; L16-08; L16-14; L16-15; L16-16; L17-07; L17-08; L17-09; L17-18; L17-19; L17-20; Laptev Sea, Siberia; LATITUDE; LEN19-S-01; LEN19-S-02; LEN19-S-03; LEN19-S-04; LEN19-S-05; LEN19-S-06; LEN19-S-07; LEN19-S-08; LEN19-S-09; LEN19-S-78; LEN19-S-89; Lena2016_spring, Lena2016_summer; Lena2017; Lena 2019; Lena Delta; Lena Delta, Siberia; LONGITUDE; MULT; Multiple investigations; POC; RU-Land_2016_Lena; RU-Land_2017_Lena; RU-Land_2019_Lena; Sample ID; Water sample; WS; Δ14C, dissolved organic carbon; Δ14C, particulate organic carbon; δ13C, dissolved organic carbon; δ13C, particulate organic carbon
    Materialart: Dataset
    Format: text/tab-separated-values, 494 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 10
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    High-resolution bathymetry model for the Lena Delta region (2021)
    PANGAEA
    Details
    Publikationsdatum: 2024-05-07
    Beschreibung: This data set includes the 50 m and 200 m bathymetry model for the Lena Delta region covering 232,700 km2 stretching from Cape Mamontov Klyk in the western Laptev Sea to Kotelny Island in the New Siberian Islands. The models were calculated with the topo to raster tool in ArcGIS TM version 10.6 based on depth points and isobaths lines derived from large-scale current and historical nautical maps. The final bathymetry models are available in GeoTiff format in 50 m (TTR_50m_LenaDelta.tif) and 200 m (TTR_200m_LenaDelta.tif) spatial resolution. In addition, the data set includes the complete input data for the bathymetry models. The input data consists of a point shapefile (Depth_points_LenaDelta.shp) including 50,828 manually digitized depth point measurements, a polyline shapefile (Isobaths_LenaDelta.shp) including 720 manually digitized isobath lines and a polygon shapefile (Water_area_LenaDelta.shp) for the water extent. The Lena Delta region bathymetry was validated with depth data derived from ship cruises in 2019 (Fuchs et al. submitted, Palmtag et al., 2021) as well as water depth data available on PANGAEA (e.g. Hölemann et al., 2020).
    Schlagwort(e): Arctic; AWI_Perma; CACOON; Changing Arctic Carbon cycle in the cOastal Ocean Near-shore; East Siberian Sea; Laptev Sea; Lena_Delta; near shore; Permafrost Research
    Materialart: Dataset
    Format: application/x-7z-compressed, 307.2 MBytes
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
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