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Full-Text Articles in Social and Behavioral Sciences
Mid-Late Holocene El Nino Variability In The Equatorial Pacific From Coral Microatolls, Colin Woodroffe, Matthew R. Beech, Michael K. Gagan
Mid-Late Holocene El Nino Variability In The Equatorial Pacific From Coral Microatolls, Colin Woodroffe, Matthew R. Beech, Michael K. Gagan
Faculty of Science, Medicine and Health - Papers: part A
Oxygen isotope ratios in Porites microatolls from Christmas Island in the central Pacific provide high-resolution proxy records of El Niño-Southern Oscillation (ENSO) variability since 3.8 thousand years ago (ka). Compared with modern microatolls, reconstructions from fossil microatolls imply that interannual variations in ENSO sea-surface temperature and precipitation were less intense 3.8–2.8 ka, but more pronounced at 1.7 ka. Amplification of ENSO at ∼2 ka is consistent with precessional changes in insolation seasonality, but exceeds model predictions and may reflect stronger rainfall teleconnections through enhanced interaction between the Southern Oscillation and the Pacific Intertropical Convergence Zone.
The Chronostratigraphy Of A Holocene Barrier Estuary: Lake Illawarra Nsw, Craig R. Sloss, Brian G. Jones, Colin V. Murray-Wallace, Charles Mcclennan
The Chronostratigraphy Of A Holocene Barrier Estuary: Lake Illawarra Nsw, Craig R. Sloss, Brian G. Jones, Colin V. Murray-Wallace, Charles Mcclennan
Faculty of Science, Medicine and Health - Papers: part A
Valley-fill sequences, preserved in topographic lows associated with incised valley systems, potentially preserve a record of Holocene sea level fluctuations. A detailed litho- and biostratigraphy of the Holocene barrier estuary, Lake Illawarra, New South Wales has been constructed. Forty kilometres of seismic surveys, forty-one vibracores, supplemented by auger drill holes and trenches, and faunal analysis provides the data for this investigation. A detailed chronology of the infilling of the barrier estuary has been established using 115 aspartic acid derived ages and six radiocarbon ages. The results provide a detailed chronology for the deposition of marine transgressive deposits, barrier growth, and …