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  • Data  (138)
  • 2015-2019  (138)
  • 1990-1994
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  • 1
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    X-ray fluorescence scannings and AMS radicarbon dates of sediment core GeoB12605-3 (2017)
    PANGAEA
    In:  Supplement to: Liu, Xi-Ting; Rendle-Bühring, Rebecca; Kuhlmann, Holger; Li, Anchun (2017): Two phases of the Holocene East African Humid Period: Inferred from a high-resolution geochemical record off Tanzania. Earth and Planetary Science Letters, 460, 123-134, https://doi.org/10.1016/j.epsl.2016.12.016
    Details
    Publication Date: 2023-03-03
    Description: During the Holocene, the most notably climatic change across the African continent is the African Humid Period (AHP), however the pace and primary forcing for this pluvial condition is still ambiguous, particularly in East Africa. We present a high-resolution marine sediment record off Tanzania to provide insights into the climatic conditions of inland East Africa during the Holocene. Major element ratios (i.e., log-ratios of Fe/Ca and Ti/Ca), derived from X-Ray Fluorescence scanning, have been employed to document variations in humidity in East Africa. Our results show that the AHP is represented by two humid phases: an intense humid period from the beginning of the Holocene to 8 ka (AHP I); and a moderate humid period spanning from 8 to 5.5 ka (AHP II). On the basis of our geochemical record and regime detection, the termination of the AHP initiated at 5.5 ka and ceased around 3.5 ka. Combined with other paleoclimatic records around East Africa, we suggest that the humid conditions in this region responded to Northern Hemisphere (NH) summer insolation. The AHP I and II might have been related to an eastward shift of the Congo Air Boundary and warmer conditions in the western Indian Ocean, which resulted in additional moisture being delivered from the Atlantic and Indian Oceans during the NH summer and autumn, respectively. We further note a drought event throughout East Africa north of 10°S around 8.2 ka, which may have been related to the southward migration of the Intertropical Convergence Zone in response to the NH cooling event.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 2
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    Grain-size distribution of terrigenous fraction and elemental concentration of bulk sediments of sediment core GeoB12605-3 (2017)
    PANGAEA
    In:  Supplement to: Liu, Xi-Ting; Rendle-Bühring, Rebecca; Henrich, Rüdiger (2017): Geochemical composition of Tanzanian shelf sediments indicates Holocene climatic and sea-level changes. Quaternary Research, 87 (3), 442-454, https://doi.org/10.1017/qua.2017.12
    Details
    Publication Date: 2023-03-03
    Description: We present a high-resolution geochemical and grain-size record from a Holocene sediment core off the Pangani River mouth, Tanzania. Elemental ratios between biogenic elements and Al (i.e., Ca/Al, Mg/Al, and Sr/Al) are mainly influenced by terrigenous dilution on carbonate concentration and/or limitation of carbonate production as a result of variations in the supply of fine-grained terrigenous sediments of the Pangani River. Such elemental ratios increased significantly at the end of the mid-Holocene between 5 and 3.5 ka, demonstrating a gradual transition from the humid early and mid-Holocene to the arid late Holocene in East Africa. Among the elemental ratios between terrigenous elements and Al, Si/Al and K/Al ratios correlate to grain-size variation, indicating a change in sedimentation regime. Fe/Al and Ti/Al ratios show that the sediment source area has shifted from the terrestrial volcanic region of Tanzania (Fe, Ti rich) to the coastal and inner-shelf regions (Fe, Ti poor) around 7.5 ka, in response to arid climate and high sea level. Our geochemical results correspond with a sea-surface temperature record derived from the same sediment core, indicating that the end of the East African Humid Period could have been gradual and related to the cooling water in the western Indian Ocean.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 3
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    Age-depth relationship, XRF/physical properties, and XRD anlaysis of sediment cores MSM09/2_467-3 (GeoTü SL 174) and MSM09/2_455-13 (GeoTü SL 170) (2017)
    PANGAEA
    In:  Supplement to: Jackson, Rebecca; Carlson, Anders Eskil; Hillaire-Marcel, Claude; Wacker, Lukas; Vogt, Christoph; Kucera, Michal (2017): Asynchronous instability of the North American-Arctic and Greenland ice sheets during the last deglaciation. Quaternary Science Reviews, 164, 140-153, https://doi.org/10.1016/j.quascirev.2017.03.020
    Details
    Publication Date: 2023-03-03
    Description: The chronology of deglacial meltwater pulses from the Laurentide Ice Sheet is well documented. However, the deglacial history of the North American-Arctic (north-eastern Laurentide and Innuitian) and western Greenland ice sheets draining into the Labrador Sea via Baffin Bay is less well constrained. Here we present new high-resolution, radiocarbon-dated records from the central Baffin Bay spanning ~17 to 10 kyr BP and documenting the full deglacial history of Baffin Bay. Sedimentological and geochemical data confirm the presence of two periods of enhanced detrital carbonate delivery, termed Baffin Bay Detrital Carbonate Events (BBDCs). These events are dated to ~14.2-13.7 kyr BP and ~12.7-11 kyr BP. They are synchronous across Baffin Bay and their mineralogical signature indicates a common source of detrital carbonate from northern Baffin Bay. The first event, BBDC 1, postdates Heinrich Event 1 and the second event, BBDC 0, predates the recently revised timing of Heinrich Event 0. The onset of the BBDC events appears not to be systematically linked to Greenland temperature change as they occur during both interstadial and stadial periods. This indicates that deglaciation of North American-Arctic and western Greenland ice sheets with the associated iceberg and meltwater discharge were decoupled from the dominant North Atlantic climate mode, where iceberg discharge events from the Laurentide Ice Sheet occurred during stadial periods.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 7 datasets
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  • 4
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    Measurements of Urban, Marine and Biogenic Air (MUMBA): characterisation of trace gases and aerosol at the urban, marine and biogenic interface in summer in Wollongong, Australia (2017)
    PANGAEA
    In:  Supplement to: Paton-Walsh, Clare; Guérette, Elise-Andrée; Kubistin, Dagmar; Humphries, Ruhi S; Wilson, Stephen R; Dominick, Doreena; Galbally, Ian; Buchholz, Rebecca R; Bhujel, Mahendra; Chambers, Scott D; Cheng, Min; Cope, Martin; Davy, Perry; Emmerson, Kathryn M; Griffith, David W T; Griffiths, Alan D; Keywood, Melita D; Lawson, Sarah; Molloy, Suzie; Rea, Geraldine; Selleck, Paul; Shi, Xue; Simmons, Jack B; Velazco, Voltaire (2017): The MUMBA Campaign: Measurements of Urban, Marine and Biogenic Air. Earth System Science Data, 9(1), 349-362, https://doi.org/10.5194/essd-9-349-2017
    Details
    Publication Date: 2023-01-13
    Description: The Measurements of Urban, Marine and Biogenic Air (MUMBA) campaign took place in Wollongong, New South Wales (a small coastal city approximately 80 km south of Sydney, Australia), from 21st December 2012 to 15th February 2013. Instruments were deployed during MUMBA to measure the gaseous and aerosol composition of the atmosphere with the aim of providing a detailed characterisation of the complex environment of the ocean/forest/urban interface that could be used to test the skill of atmospheric models. Gases measured included ozone, oxides of nitrogen, carbon monoxide, carbon dioxide, methane and many of the most abundant volatile organic compounds. Aerosol characterisation included total particle counts above 3 nm, total cloud condensation nuclei counts; mass concentration of PM2.5, number concentration size distribution, aerosol chemical analyses and elemental analysis. Meteorological measurements and LIDAR measurements were also performed. The campaign captured varied meteorological conditions, including two extreme heat events, providing a potentially valuable test for models of future air quality in a warmer climate. There was also an episode when the site sampled clean marine air for many hours, providing a useful additional measure of background concentrations of these trace gases within this poorly sampled region of the globe. Here we present the observations recorded at the MUMBA site during the campaign, as well as radon and air quality data from nearby sites. These records can be used for testing chemical transport models.
    Type: Dataset
    Format: application/zip, 17 datasets
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  • 5
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    FT-ICR-MS characterization of organic matter and further sample details of Bangladeshi aquifer sediment incubated with aquifer recharge waters (2017)
    PANGAEA
    In:  Supplement to: Pracht, Lara E; Tfaily, Malak M; Ardissono, Robert J; Neumann, Rebecca B (2018): Molecular characterization of organic matter mobilized from Bangladeshi aquifer sediment: tracking carbon compositional change during microbial utilization. Biogeosciences, 15(6), 1733-1747, https://doi.org/10.5194/bg-15-1733-2018
    Details
    Publication Date: 2023-01-13
    Description: Bioavailable organic carbon in aquifer-recharge waters and sediments can fuel microbial reactions with implications for groundwater quality. A previous incubation experiment showed that sedimentary organic carbon (SOC) mobilized off sandy sediment collected from an arsenic-contaminated and methanogenic aquifer in Bangladesh was bioavailable; it was fermented into methane. We used high-resolution mass spectrometry to molecularly characterize this mobilized SOC, reference its composition against dissolved organic carbon (DOC) in aquifer recharge water, track compositional changes during incubation, and advance understanding of how composition relates to bioavailability in anaerobic conditions.
    Keywords: Bangladesh; MULT; Multiple investigations
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 6
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    Physical oceanography from mooring KPO_0884 (2018)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: Current velocity, east-west; Current velocity, north-south; DATE/TIME; DEPTH, water; kpo_0884; KPO_0884; MOOR; Mooring; Pressure, water; Ronald H. Brown; Sample code/label; Temperature, water; TROPINT02
    Type: Dataset
    Format: text/tab-separated-values, 113142 data points
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  • 7
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    Physical oceanography from mooring KPO_0885 (2018)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: CLIVAR; Current velocity, east-west; Current velocity, north-south; DATE/TIME; DEPTH, water; kpo_0885; KPO_0885; MOOR; Mooring; Pressure, water; Salinity; Sample code/label; SO151; Sonne; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 193596 data points
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  • 8
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    Physical oceanography from mooring KPO_0886 (2018)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: Current velocity, east-west; Current velocity, north-south; DATE/TIME; DEPTH, water; kpo_0886; KPO_0886; MOOR; Mooring; Pressure, water; Ronald H. Brown; Salinity; Sample code/label; Temperature, water; TROPINT02
    Type: Dataset
    Format: text/tab-separated-values, 831942 data points
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  • 9
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    Physical oceanography from mooring KPO_0887 (2018)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: CLIVAR; Current velocity, east-west; Current velocity, north-south; DATE/TIME; DEPTH, water; kpo_0887; KPO_0887; MOOR; Mooring; Pressure, water; Salinity; Sample code/label; SO151; Sonne; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 317947 data points
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  • 10
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    Physical oceanography from mooring KPO_0888 (2018)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: Current velocity, east-west; Current velocity, north-south; DATE/TIME; DEPTH, water; kpo_0888; KPO_0888; MOOR; Mooring; Pressure, water; Ronald H. Brown; Sample code/label; Temperature, water; TROPINT02
    Type: Dataset
    Format: text/tab-separated-values, 263008 data points
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