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  • 1
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    PANGAEA
    In:  Supplement to: Toomey, Michael R; Woodruff, Jonathan D; Donnelly, Jeffrey P; Ashton, Andrew D; Perron, J Taylor (2016): Seismic evidence of glacial-age river incision into the Tahaa barrier reef, French Polynesia. Marine Geology, 380, 284-289, https://doi.org/10.1016/j.margeo.2016.04.008
    Publication Date: 2023-02-08
    Description: Rivers have long been recognized for their ability to shape reef-bound volcanic islands. On the time-scale of glacial?interglacial sea-level cycles, fluvial incision of exposed barrier reef lagoons may compete with constructional coral growth to shape the coastal geomorphology of ocean islands. However, overprinting of Pleistocene landscapes by Holocene erosion or sedimentation has largely obscured the role lowstand river incision may have played in developing the deep lagoons typical of modern barrier reefs. Here we use high-resolution seismic imagery and core stratigraphy to examine how erosion and/or deposition by upland drainage networks has shaped coastal morphology on Tahaa, a barrier reef-bound island located along the Society Islands hotspot chain in French Polynesia. At Tahaa, we find that many channels, incised into the lagoon floor during Pleistocene sea-level lowstands, are located near the mouths of upstream terrestrial drainages. Steeper antecedent topography appears to have enhanced lowstand fluvial erosion along Tahaa's southwestern coast and maintained a deep pass. During highstands, upland drainages appear to contribute little sediment to refilling accommodation space in the lagoon. Rather, the flushing of fine carbonate sediment out of incised fluvial channels by storms and currents appears to have limited lagoonal infilling and further reinforced development of deep barrier reef lagoons during periods of highstand submersion.
    Keywords: Age, 14C AMS; Age, dated; Age, dated material; Age, dated standard error; CDRILL; Core drilling; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Event label; French Polynesia; Latitude of event; Longitude of event; TAH_VC8; TAH_VC9; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 28 data points
    Location Call Number Expected Availability
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  • 2
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    Unknown
    PANGAEA
    In:  Supplement to: Toomey, Michael R; Curry, William B; Donnelly, Jeffrey P; vam Hengstum, Peter J (2013): Reconstructing 7000 years of North Atlantic hurricane variability using deep-sea sediment cores from the western Great Bahama Bank. Paleoceanography, 28(1), 31-41, https://doi.org/10.1002/palo.20012
    Publication Date: 2023-06-27
    Description: Available overwash records from coastal barrier systems document significant variability in North Atlantic hurricane activity during the late Holocene. The same climate forcings that may have controlled cyclone activity over this interval (e.g., the West African Monsoon, El Niño-Southern Oscillation (ENSO)) show abrupt changes around 6000 yrs B.P., but most coastal sedimentary records do not span this time period. Establishing longer records is essential for understanding mid-Holocene patterns of storminess and their climatic drivers, which will lead to better forecasting of how climate change over the next century may affect tropical cyclone frequency and intensity. Storms are thought to be an important mechanism for transporting coarse sediment from shallow carbonate platforms to the deep-sea, and bank-edge sediments may offer an unexplored archive of long-term hurricane activity. Here, we develop this new approach, reconstructing more than 7000 years of North Atlantic hurricane variability using coarse-grained deposits in sediment cores from the leeward margin of the Great Bahama Bank. High energy event layers within the resulting archive are (1) broadly correlated throughout an offbank transect of multi-cores, (2) closely matched with historic hurricane events, and (3) synchronous with previous intervals of heightened North Atlantic hurricane activity in overwash reconstructions from Puerto Rico and elsewhere in the Bahamas. Lower storm frequency prior to 4400 yrs B.P. in our records suggests that precession and increased NH summer insolation may have greatly limited hurricane potential intensity, outweighing weakened ENSO and a stronger West African Monsoon-factors thought to be favorable for hurricane development.
    Keywords: Age, 14C AMS; Age, 14C calibrated; Age, comment; Age, dated; Age, dated material; Age, dated standard deviation; Calendar age; DEPTH, sediment/rock; Elevation of event; Event label; Florida Strait; GC; Gravity corer; KN166-2; Knorr; KNR166-2; KNR166-2-117; KNR166-2-118; KNR166-2-119; KNR166-2-133; KNR166-2-135; Latitude of event; Longitude of event; MUC; MultiCorer; PC; Piston corer
    Type: Dataset
    Format: text/tab-separated-values, 112 data points
    Location Call Number Expected Availability
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