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Articles 61 - 90 of 305
Full-Text Articles in Social and Behavioral Sciences
Reconstructing Recent Sedimentation In Two Urbanised Coastal Lagoons (Nsw, Australia) Using Radioisotopes And Geochemistry, Brian Jones, H Heijnis, J. Harrison, Suzanne Hollins, S Hankin, Atun Zawadzki
Reconstructing Recent Sedimentation In Two Urbanised Coastal Lagoons (Nsw, Australia) Using Radioisotopes And Geochemistry, Brian Jones, H Heijnis, J. Harrison, Suzanne Hollins, S Hankin, Atun Zawadzki
B. G. Jones
In this study, we combined grain size and geochemical analyses with radioisotope analysis of lead-210 (210Pb), caesium-137 (137Cs) and radiocarbon (14C) ages to reconstruct the sedimentation history of two urbanised coastal lagoons in south-east Australia. Towradgi and Fairy Lagoons were both found to exhibit slow initial sedimentation of less than 1 mm year-1 prior to anthropogenic influences. Land clearing in the catchments increased runoff and erosion in the creeks feeding into the estuaries, and has resulted in progradation of fluvial material into the estuarine systems with a marked increase in sedimentation to between 2 and 7 mm year-1. The upper …
Assessing Soil Remobilisation In Catchments Using A 137 Cs-Sediment Hillslope Model, Ava D. Simms, Colin D. Woodroffe, Brian G. Jones, Henk Heijnis, Jennifer Harrison, Rob Mann
Assessing Soil Remobilisation In Catchments Using A 137 Cs-Sediment Hillslope Model, Ava D. Simms, Colin D. Woodroffe, Brian G. Jones, Henk Heijnis, Jennifer Harrison, Rob Mann
B. G. Jones
Soil redistribution studies are important, especially in water supply catchments, because the rate at which denudation is occurring has implications for offsite water quality. However, the extent to which soil is redistributed within the landscape can be difficult to determine. This challenge can be overcome using fallout caesium-137 (137Cs). This paper describes the rates of soil loss and remobilisation in two sub-catchments within the Sydney Basin region, namely Kembla and Kentish Creeks, which drain to the Cordeaux reservoir. The total inventories of 137Cs in catchment soils were determined, a 137Cs-regression equation and a theoretical diffusion and migration model were used …
The Geomorphology Of The Flanks Of The Lord Howe Island Volcano, Tasman Sea, Australia, D. Kennedy, B. Brooke, Colin Woodroffe, Brian Jones, C. Waikari, S. Nichol
The Geomorphology Of The Flanks Of The Lord Howe Island Volcano, Tasman Sea, Australia, D. Kennedy, B. Brooke, Colin Woodroffe, Brian Jones, C. Waikari, S. Nichol
B. G. Jones
No abstract provided.
Assessing The Recent (1834-2002) Morphological Evolution Of A Rapidly Prograding Delta Within A Gis Framework: Macquarie Rivulet Delta, Lake Illawarra, New South Wales, Marjetta Puotinen, Brian Jones, Carl Hopley
Assessing The Recent (1834-2002) Morphological Evolution Of A Rapidly Prograding Delta Within A Gis Framework: Macquarie Rivulet Delta, Lake Illawarra, New South Wales, Marjetta Puotinen, Brian Jones, Carl Hopley
B. G. Jones
No abstract provided.
Geomorphic Evidence For Mid-Late Holocene Higher Sea Level From Southeastern Australia, Adam Switzer, Craig Sloss, Brian Jones, C. Bristow
Geomorphic Evidence For Mid-Late Holocene Higher Sea Level From Southeastern Australia, Adam Switzer, Craig Sloss, Brian Jones, C. Bristow
B. G. Jones
No abstract provided.
Investigation Of Large-Scale Washover Of A Small Barrier System On The Southeast Australian Coast Using Ground Penetrating Radar, Brian G. Jones, C Bristow, Adam D. Switzer
Investigation Of Large-Scale Washover Of A Small Barrier System On The Southeast Australian Coast Using Ground Penetrating Radar, Brian G. Jones, C Bristow, Adam D. Switzer
B. G. Jones
Prehistoric depositional signatures for large-scale washover involving marine inundation events such as storm and tsunami have been the subject of considerable research over the last 15 years. Much of this research has focused on the identification of sand sheets in back-barrier environments as depositional records for extreme washover events. All these deposits must have a sediment source, and by their nature, the most likely source of sediment for washover into back-barrier environments is the barrier itself. This study identifies an erosional signature for large-scale washover from a small coastal barrier on the southeast Australian coast. A distinct lense of marine …
The Holocene Infill Of Lake Conjola, A Narrow Incised Valley System On The Southeast Coast Of Australia, Craig Sloss, Brian Jones, Adam Switzer, Scott Nichol, Alastair Clement, William Nicholas
The Holocene Infill Of Lake Conjola, A Narrow Incised Valley System On The Southeast Coast Of Australia, Craig Sloss, Brian Jones, Adam Switzer, Scott Nichol, Alastair Clement, William Nicholas
B. G. Jones
No abstract provided.
Sea Level, Storm, Or Tsunami: Engimatic Sand Sheet Deposits In A Sheltered Coastal Embayment From Southeastern New South Wales, Australia, Edward Bryant, Brian Jones, Kevin Pucillo, Rabea Haredy, Adam Switzer
Sea Level, Storm, Or Tsunami: Engimatic Sand Sheet Deposits In A Sheltered Coastal Embayment From Southeastern New South Wales, Australia, Edward Bryant, Brian Jones, Kevin Pucillo, Rabea Haredy, Adam Switzer
B. G. Jones
No abstract provided.
The Sedimentary Record Of Palaeoenvironments And Sea-Level Change In The Gulf Of Carpentaria, Australia, Through The Last Glacial Cycle, Jessica Reeves, Allan Chivas, Adriana Garcia, Sabine Holt, Martine Couapel, Brian Jones, Dionisio Cendon, David Fink
The Sedimentary Record Of Palaeoenvironments And Sea-Level Change In The Gulf Of Carpentaria, Australia, Through The Last Glacial Cycle, Jessica Reeves, Allan Chivas, Adriana Garcia, Sabine Holt, Martine Couapel, Brian Jones, Dionisio Cendon, David Fink
B. G. Jones
Environmental evolution of the Gulf of Carpentaria region, the world's largest tropical epicontinental seaway, through the last glacial cycle has been determined from a series of six sediment cores. These cores form the focus of a multi-disciplinary study to elucidate sea level, climate and environmental change in the region. The sedimentary record reveals a series of facies including open shallow marine, marginal marine, estuarine, lacustrine and subaerial exposure, throughout the extent of the basin during this period. The partial or complete closure of the central basin from marine waters results from sea level falling below the height of one or …
Climate Change In The Dead Heart Of Australia, Joshua Larsen, Gerald C. Nanson, Timothy J. Cohen, Brian G. Jones, John D. Jansen, Jan-Hendrik May
Climate Change In The Dead Heart Of Australia, Joshua Larsen, Gerald C. Nanson, Timothy J. Cohen, Brian G. Jones, John D. Jansen, Jan-Hendrik May
B. G. Jones
Despite the absence of large-scale glaciation, the Australian continent has experienced substantial environmental change throughout the Quaternary period. This is especially pronounced in central Australia, where one seventh of the continent is drained internally to the depocentre, and lowest point in Australia, Lake Eyre (Figure 1). Research has shown that at one time, large sandy braided and meandering rivers carried water through dunefields to a large freshwater lake system. Today, the rivers are hostage to the dunefield, and floodwaters might only reach Lake Eyre once every ten years or so. In order to understand the development of this arid desert …
Holocene Sea Level Fluctuations And The Sedimentary Evolution Of A Barrier Estuary: Lake Illawarra, New South Wales, Australia, Colin Murray-Wallace, Brian Jones, Craig Sloss, C.E. Mcclennen
Holocene Sea Level Fluctuations And The Sedimentary Evolution Of A Barrier Estuary: Lake Illawarra, New South Wales, Australia, Colin Murray-Wallace, Brian Jones, Craig Sloss, C.E. Mcclennen
B. G. Jones
No abstract provided.
Holocene Evolution Of The Minnamurra River Estuary, Southeast Australia: Foraminiferal Evidence, S. Haslett, R. Davies-Burrows, K. Panayotou, Brian Jones, Colin Woodroffe
Holocene Evolution Of The Minnamurra River Estuary, Southeast Australia: Foraminiferal Evidence, S. Haslett, R. Davies-Burrows, K. Panayotou, Brian Jones, Colin Woodroffe
B. G. Jones
No abstract provided.
Morphological Changes, Assessed Within A Gis Framework, In The Prograding Macquarie Rivulet Delta, New South Wales, Carl Hopley, Brian Jones, Marjetta Puotinen
Morphological Changes, Assessed Within A Gis Framework, In The Prograding Macquarie Rivulet Delta, New South Wales, Carl Hopley, Brian Jones, Marjetta Puotinen
B. G. Jones
No abstract provided.
Identification Of The Permian-Triassic Boundary In The Southern Sydney Basin, Megan Williams, Paul Carr, Brian Jones
Identification Of The Permian-Triassic Boundary In The Southern Sydney Basin, Megan Williams, Paul Carr, Brian Jones
B. G. Jones
No abstract provided.
Response Of Coral Reefs To Climate Change: Expansion And Demise Of The Southernmost Pacific Coral Reef, Colin D. Woodroffe, Brendan P. Brooke, Michelle Linklater, David M. Kennedy, Brian G. Jones, Cameron Buchanan, Richard Mleczko, Quan Hua, Jian-Xin Zhao
Response Of Coral Reefs To Climate Change: Expansion And Demise Of The Southernmost Pacific Coral Reef, Colin D. Woodroffe, Brendan P. Brooke, Michelle Linklater, David M. Kennedy, Brian G. Jones, Cameron Buchanan, Richard Mleczko, Quan Hua, Jian-Xin Zhao
B. G. Jones
Coral reefs track sea level and are particularly sensitive to changes in climate. Reefs are threatened by global warming, with many experiencing increased coral bleaching. Warmer sea surface temperatures might enable reef expansion into mid latitudes. Here we report multibeam sonar and coring that reveal an extensive relict coral reef around Lord Howe Island, which is fringed by the southernmost reef in the Pacific Ocean. The relict reef, in water depths of 25-50 m, flourished in early Holocene and covered an area more than 20 times larger than the modern reef. Radiocarbon and uranium-series dating indicates that corals grew between …
Setup, Deposition And Sedimentary Characteristics Of Two Storm Overwash Deposits, Abrahams Bosom Beach, Southeastern Australia, Brian Jones, Adam Switzer
Setup, Deposition And Sedimentary Characteristics Of Two Storm Overwash Deposits, Abrahams Bosom Beach, Southeastern Australia, Brian Jones, Adam Switzer
B. G. Jones
No abstract provided.
Ichnological And Sedimentologic Signatures Of Mixed Wave- And Storm-Dominated Deltaic Deposits: Examples From The Early Permian Sydney Basin, Australia, Brian Jones, Stuart Tye, James Maceachern, Kerrie Bann, Christopher Fielding
Ichnological And Sedimentologic Signatures Of Mixed Wave- And Storm-Dominated Deltaic Deposits: Examples From The Early Permian Sydney Basin, Australia, Brian Jones, Stuart Tye, James Maceachern, Kerrie Bann, Christopher Fielding
B. G. Jones
No abstract provided.
Large-Scale Washover Sedimentation In A Freshwater Lagoon From The Southeast Australian Coast: Sea-Level Change, Tsunami Or Exceptionally Large Storm?, Brian Jones, Adam Switzer
Large-Scale Washover Sedimentation In A Freshwater Lagoon From The Southeast Australian Coast: Sea-Level Change, Tsunami Or Exceptionally Large Storm?, Brian Jones, Adam Switzer
B. G. Jones
No abstract provided.
Aminostratigraphy Of Two Holocene Wave-Dominated Barrier Estuaries In Southeastern Australia, Colin Murray-Wallace, Brian Jones, Craig Sloss
Aminostratigraphy Of Two Holocene Wave-Dominated Barrier Estuaries In Southeastern Australia, Colin Murray-Wallace, Brian Jones, Craig Sloss
B. G. Jones
No abstract provided.
Freshwater Recharge Into A Shallow Saline Groundwater System, Cooper Creek Floodplain, Queensland, Australia, Dionisio Cendon, Joshua Larsen, Brian Jones, Gerald Nanson, David Rickleman, S. Hankin, J. Pueyo, Jerry Maroulis
Freshwater Recharge Into A Shallow Saline Groundwater System, Cooper Creek Floodplain, Queensland, Australia, Dionisio Cendon, Joshua Larsen, Brian Jones, Gerald Nanson, David Rickleman, S. Hankin, J. Pueyo, Jerry Maroulis
B. G. Jones
No abstract provided.
Continental Aridification And The Vanishing Of Australia's Megalakes, Timothy J. Cohen, Gerald C. Nanson, John D. Jansen, B. G. Jones, Zenobia Jacobs, P Treble, David M. Price, Jan-Hendrik May, A Smith, Linda K. Ayliffe, John C. Hellstrom
Continental Aridification And The Vanishing Of Australia's Megalakes, Timothy J. Cohen, Gerald C. Nanson, John D. Jansen, B. G. Jones, Zenobia Jacobs, P Treble, David M. Price, Jan-Hendrik May, A Smith, Linda K. Ayliffe, John C. Hellstrom
B. G. Jones
The nature of the Australian climate at about the time of rapid megafaunal extinctions and humans arriving in Australia is poorly understood and is an important element in the contentious debate as to whether humans or climate caused the extinctions. Here we present a new paleoshoreline chronology that extends over the past 100 k.y. for Lake Mega-Frome, the coalescence of Lakes Frome, Blanche, Callabonna and Gregory, in the southern latitudes of central Australia. We show that Lake Mega-Frome was connected for the last time to adjacent Lake Eyre at 50-47 ka, forming the largest remaining interconnected system of paleolakes on …
Alluvial Evidence For Major Climate And Flow Regime Changes During The Middle And Late Quaternary For Eastern Central Australia, Gerald C. Nanson, David M. Price, B. G. Jones, Jerry C. Maroulis, Maria Coleman, Hugo Bowman, Timothy J. Cohen, Tim Pietsch, Joshua R. Larsen
Alluvial Evidence For Major Climate And Flow Regime Changes During The Middle And Late Quaternary For Eastern Central Australia, Gerald C. Nanson, David M. Price, B. G. Jones, Jerry C. Maroulis, Maria Coleman, Hugo Bowman, Timothy J. Cohen, Tim Pietsch, Joshua R. Larsen
B. G. Jones
As a low-gradient arid region spanning the tropics to the temperate zone, the Lake Eyre basin has undergone gentle late Cenozoic crustal warping leading to substantial alluvial deposition, thereby forming repositories of evidence for palaeoclimatic and palaeohydrological changes from the Late Tertiary to the Holocene. Auger holes and bank exposures at five locations along the lower 500 km of Cooper Creek, a major contributor to Lake Eyre in the eastern part of the basin, yielded 85 luminescence dates (TL and OSL) that, combined wit a further 142 luminescence dates from northeastern Australia, have established a chronology of multiple episodes of …
Late Quaternary Aeolian And Fluvial Interactions On The Cooper Creek Fan And The Association Between Linear And Source-Bordering Dunes, Strzelecki Desert, Australia, Timothy Cohen, Gerald Nanson, Joshua Larsen, B. Jones, David Price, Maria Coleman, Tim Pietsch
Late Quaternary Aeolian And Fluvial Interactions On The Cooper Creek Fan And The Association Between Linear And Source-Bordering Dunes, Strzelecki Desert, Australia, Timothy Cohen, Gerald Nanson, Joshua Larsen, B. Jones, David Price, Maria Coleman, Tim Pietsch
B. G. Jones
The Innamincka Dome and associated low-gradient fan in the Strzelecki Desert is the product of Cenozoic crustal warping that has aided formation of an extensive array of palaeochannels, source-bordering transverse dunes and superimposed linear dunes. These dunes have impeded the course of Cooper Creek and provided a repository of evidence for Quaternary climate change as well as the interactive processes between transverse and linear dune formation. At Turra, Gidgealpa and sites nearby are extensive fluvial and aeolian sand bodies that date from marine isotope stages (MIS) 8-3 and the Last Glacial Maximum (LGM) and are now surrounded or buried by …
Photoelectron-Photofragment Coincidence Studies Of No-_X Clusters (X = H2o, Cd4), Berwyck Poad, Christopher Johnson, Robert Continetti
Photoelectron-Photofragment Coincidence Studies Of No-_X Clusters (X = H2o, Cd4), Berwyck Poad, Christopher Johnson, Robert Continetti
Berwyck L. J. Poad
The dissociative photodetachment of NO -(H2O)and NO -(CD4) anion clusters was studied at 775 nm (1.60 eV) using photoelectron-photofragment coincidence spectroscopy. The correlation between the photoelectron and photodetached neutral spectra indicates vibrational excitation in the recoiling NO neutral fragments from NO-(H2O), with a progression consistent with vibrational excitation up to v(NO) = 3 in the products. The correlation remains when D2O is substituted for H2O, implying the NO vibrational mode plays a role in the dissociation coordinate of the complex. In contrast, no correlation was observed between photoelectron kinetic …
Ozone-Induced Dissociation On A Modified Tandem Linear Ion-Trap: Observations Of Different Reactivity For Isomeric Lipids, Berwyck Poad, Huong Pham, Michael Thomas, Jessica Hughes, J Campbell, Todd Mitchell, Stephen Blanksby
Ozone-Induced Dissociation On A Modified Tandem Linear Ion-Trap: Observations Of Different Reactivity For Isomeric Lipids, Berwyck Poad, Huong Pham, Michael Thomas, Jessica Hughes, J Campbell, Todd Mitchell, Stephen Blanksby
Berwyck L. J. Poad
Ozone-induced dissociation (OzID) exploits the gas-phase reaction between mass-selected lipid ions and ozone vapor to determine the position(s) of unsaturation. In this contribution, we describe the modification of a tandem linear ion-trap mass spectrometer specifically for OzID analyses wherein ozone vapor is supplied to the collision cell. This instrumental configuration provides spatial separation between mass-selection, the ozonolysis reaction, and mass-analysis steps in the OzID process and thus delivers significant enhancements in speed and sensitivity (ca. 30-fold). These improvements allow spectra revealing the double-bond position(s) within unsaturated lipids to be acquired within 1 s: significantly enhancing the utility of OzID in …
Communication: New Insight Into The Barrier Governing Co2 Formation From Oh + Co, Christopher Johnson, Berwyck Poad, Ben Shen, Robert Continetti
Communication: New Insight Into The Barrier Governing Co2 Formation From Oh + Co, Christopher Johnson, Berwyck Poad, Ben Shen, Robert Continetti
Berwyck L. J. Poad
Despite its relative simplicity, the role of tunneling in the reaction OH + CO → H + CO(2) has eluded the quantitative predictive powers of theoretical reaction dynamics. In this study a one-dimensional effective barrier to the formation of H + CO(2) from the HOCO intermediate is directly extracted from dissociative photodetachment experiments on HOCO and DOCO. Comparison of this barrier to a computed minimum-energy barrier shows that tunneling deviates significantly from the calculated minimum-energy pathway, predicting product internal energy distributions that match those found in the experiment and tunneling lifetimes short enough to contribute significantly to the overall reaction. …
Attachment Of Molecular Hydrogen To An Isolated Boron Cation: An Infrared And Ab Initio Study, Viktoras Dryza, Berwyck L. J Poad, Evan J. Bieske
Attachment Of Molecular Hydrogen To An Isolated Boron Cation: An Infrared And Ab Initio Study, Viktoras Dryza, Berwyck L. J Poad, Evan J. Bieske
Berwyck L. J. Poad
Structural properties of the B+−H2 electrostatic complex are investigated through its rotationally resolved infrared spectrum in the H−H stretch region (3905−3975 cm−1). The spectrum, which was obtained by monitoring B+ photofragments while the IR wavelength was scanned, is consistent with the complex having a T-shaped structure and a vibrationally averaged intermolecular separation of 2.26 Å, which decreases by 0.04 Å when the H2 subunit is vibrationally excited. The H−H stretch transition of B+−H2 is red-shifted by 220.6 ± 1.5 cm−1 from that of the free H2 molecule, much more than for other dihydrogen complexes with comparable binding energies. Properties of …
Interactions Between The Chloride Anion And Aromatic Molecules: Infrared Spectra Of The Cl-_C6h5ch3, Cl-_C6h5nh2 And Cl-_C6h5oh Complexes, Corinna Emmeluth, Berwyck L. J Poad, Christopher D. Thompson, Evan J. Bieske
Interactions Between The Chloride Anion And Aromatic Molecules: Infrared Spectra Of The Cl-_C6h5ch3, Cl-_C6h5nh2 And Cl-_C6h5oh Complexes, Corinna Emmeluth, Berwyck L. J Poad, Christopher D. Thompson, Evan J. Bieske
Berwyck L. J. Poad
The Cl-−C6H5CH3·Ar, Cl-−C6H5NH2·Ar, and Cl-−C6H5OH·Ar anion complexes are investigated using infrared photodissociation spectroscopy and ab initio calculations at the MP2/aug-cc-pVDZ level. The results indicate that for Cl-−C6H5NH2 and Cl-−C6H5OH, the Cl- anion is attached to the substituent group by a single near-linear hydrogen bond. For Cl-−C6H5CH3, the Cl- is attached to an ortho-hydrogen atom on the aromatic ring and to a hydrogen atom on the methyl group by a weaker hydrogen bond. The principal spectroscopic consequence of the hydrogen-bonding interaction in the three complexes is a red-shift and intensity increase for the CH, NH, and OH stretching modes. Complexities in …
Mixing Laser Spectroscopy And Mass Spectrometry- Infrared Spectra Of Metal Cation- Hydrogen Complexes, Vikoras Dryza, Berwyck Poad, Evan Bieske
Mixing Laser Spectroscopy And Mass Spectrometry- Infrared Spectra Of Metal Cation- Hydrogen Complexes, Vikoras Dryza, Berwyck Poad, Evan Bieske
Berwyck L. J. Poad
We describe recent experiments in which mass spectrometry and laser spectroscopy are combined to characterize Li(+)-H(2), Na(+)-H(2), B(+)-H(2), and Al(+)-H(2) complexes in the gas-phase. The infrared spectra, which feature full resolution of rotational sub-structure, are recorded by monitoring M(+) photo fragments as the infrared wavelength is scanned. The spectra deliver detailed information on the way in which a hydrogen molecule is attached to a metal cation including the intermolecular separation, the force constant for the intermolecular bond and the H-H stretching frequency. The complexes all possess T-shaped equilibrium geometries and display a clear correlation between the length and force constant …
Attaching Molecular Hydrogen To Metal Cations: Perspectives From Gas-Phase Infrared Spectroscopy, Viktoras Dryza, Berwyck Poad, Evan Bieske
Attaching Molecular Hydrogen To Metal Cations: Perspectives From Gas-Phase Infrared Spectroscopy, Viktoras Dryza, Berwyck Poad, Evan Bieske
Berwyck L. J. Poad
In this perspective article we describe recent infrared spectroscopic investigations of mass-selected M+–H2 and M+–D2 complexes in the gas-phase, with targets that include Li+–H2, B+–H2, Na+–H2, Mg+–H2, Al+–H2, Cr+–D2, Mn+–H2, Zn+–D2 and Ag+–H2. Interactions between molecular hydrogen and metal cations play a key role in several contexts, including in the storage of molecular hydrogen in zeolites, metal–organic frameworks, and …