Holocene millennial/centennial‐scale multiproxy cyclicity in temperate eastern Australian estuary sediments

Skilbeck, C. Gregory; Rolph, Tim; Hill, N.A.; Woods, Jonathan; Wilkens, Roy H

doi:10.1002/jqs.920

Cited by 19 publications

(17 citation statements)

References 67 publications

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“…The 1700 years periodicity corresponds to the ∼1800 yr frequencies already identified in lake sediment records, and it has been attributed to variation in insolation (Skilbeck et al, 2005).…”

Section: High-frequency Cyclicitysupporting

confidence: 53%

Geochemical evidence for high-resolution variations during deposition of the Holocene S1 sapropel on the Cretan Ridge, Eastern Mediterranean

Gennari

Tamburini

Ariztegui

et al. 2009

Palaeogeography, Palaeoclimatology, Palaeoecology

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Major and minor element distributions and solid phase phosphorus contents were measured in a sediment core from the Cretan Ridge that contains the Holocene S1 sapropel. Micro-XRF ultra-high resolution analysis reveals multiple Mn peaks in the oxidized upper portion of the sapropel, which implies either a non-steadystate upward remobilization of Mn or not constant downward diffusion of bottom water oxygen. Sequential extraction allowed the identification of different phosphorus phases. Detrital phosphorus increases in the sapropel layer, suggesting enhanced delivery from land during sapropel deposition. Higher organic carbon to organic phosphorus ratios in the sapropel indicate enhanced regeneration of phosphorus relative to carbon under low-oxygen conditions. Fourier analysis on the ultra-high resolution XRF data reveals frequencies that are provisionally assigned to millennial to decennial solar cycles. Although these cycles have been reported from several continental and marine archives, they have never been documented from Sapropel S1 in the Eastern Mediterranean.

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Section: High-frequency Cyclicitysupporting

confidence: 53%

Geochemical evidence for high-resolution variations during deposition of the Holocene S1 sapropel on the Cretan Ridge, Eastern Mediterranean

Gennari

Tamburini

Ariztegui

et al. 2009

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…Figure 2 shows the Myall Lake coastline and the 1.5 m depth contour. A layer of gyttja (organic mud) covers the bottom of most of Myall Lake (Skilbeck et al, 2005). Gyttja is ubiquitous in the shallow bays on the northern and western shorelines of Myall Lake.…”

Section: Study Areamentioning

confidence: 99%

Mechanisms affecting biomass and distribution of charophytes and Najas marina in Myall Lake, New South Wales, Australia

Sanderson¹,

Asaeda

Rajapakse

et al. 2008

Hydrobiologia

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Two years of measurements are explored with a view to formulating an ecosystem model for Myall Lake. Stable physical characteristics, low catchment loads, low light attenuation, flat-bottomed hypsometry, and soft gyttja substrate allow stable charophyte biomass throughout the year in Myall Lake. Chara fibrosa dominates the total biomass and is abundant over the depth range 0.5-4 m. Nitella hyalina is found over the same depth range but has diminished biomass at depths greater than 2 m due to increased incidence of zero-biomass samples at depths greater than 1.5 m. Upper bounds for biomass densities were estimated for charophytes. Najas marina has great seasonal variability and meadows can have very high biomass in waters 1.5-2.7 m deep. High biomass of Najas marina is associated with low biomass of Nitella hyalina and may be a factor determining how the biomass of Nitella hyalina is distributed with respect to depth. Patchiness of Najas marina is particularly high. Temperature and light can support two growing seasons for Najas marina but mechanical disturbance is often high in spring and high biomass was only observed in late autumn during the present study. Less than 5% of the present-day production of submerged macrophytes would have been required to produce organic material of the gyttja over a 1,000-year period. The spatial distributions of gyttja and the dominant macrophytes are consistent with wind patterns. Downlake limits on the distributions of charophytes and Najas marina are related to a gradient in the coefficient of light attenuation that is, in turn, related to proximity to the bulk of the catchment load.

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“…The sedimentologic and depositional facies patterns resulting from climatic fluctuations are commonly recorded in clastic shoreline deposits, and can be quantified using a variety of analytical techniques based on, for example, beach dune ridge granulometry and topography (e.g., Tanner et al 1989;Tanner 1991Tanner , 1992 for the Gulf of Mexico), ground-penetrating radar (GPR; e.g., Buynevich et al 2004 for Maine; Aagaard et al 2007 for Denmark; Garrison et al 2010 for the Gulf of Mexico), coring (e.g., Buynevich et al 2004;Skilbeck et al 2005 for eastern Australia), and a variety of geochemical analyses of sediments (Skilbeck et al 2005;Aagaard et al 2007). …”

Section: Introductionmentioning

confidence: 99%

Can beach dune ridges of the Texas Gulf Coast preserve climate signals?

et al. 2011

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A study of the evolution of North Padre Island (southern Texas Gulf Coast) dunes was carried out using LIDAR topographic data, dune vibracores through the center of the dunes, and grab samples of shoreface sand at four locations along a cross-shore profile. Grain-size analyses of the vibracores show vertical variations in shoreface sand deposition over decimeter depth intervals. A dune ridge growth model is introduced that describes the dune vertical accretion rate as a function of island progradation and freshwater lens expansion. This model allows indirect dating of the dune core samples based on a known island progradation rate (1 m/year), and height and spacing of the dunes calculated from the topographic data. A sand provenance model is also proposed that links the sand deposition in the dunes with sand sourced from various depths along the shoreface profile, depending on storm activity. We present evidence linking the changes in storm-sand deposition in the dune cores with yearly climatic fluctuations in the Gulf of Mexico associated with landfalling tropical storm activity in the period from 1942-1965. This record of storm-induced sand variability is negatively correlated with El Niño-Southern Oscillation (Pacific) sea surface temperature variability, and positively correlated with North Atlantic decadal sea surface temperature variability.

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Holocene millennial/centennial‐scale multiproxy cyclicity in temperate eastern Australian estuary sediments

Cited by 19 publications

References 67 publications

Geochemical evidence for high-resolution variations during deposition of the Holocene S1 sapropel on the Cretan Ridge, Eastern Mediterranean

Geochemical evidence for high-resolution variations during deposition of the Holocene S1 sapropel on the Cretan Ridge, Eastern Mediterranean

Mechanisms affecting biomass and distribution of charophytes and Najas marina in Myall Lake, New South Wales, Australia

Can beach dune ridges of the Texas Gulf Coast preserve climate signals?

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