A5026078520- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Geological formations and processes
- Cryospheric studies and observations
- Isotope Analysis in Ecology
- Paleontology and Stratigraphy of Fossils
- Geological and Geochemical Analysis
- Polar Research and Ecology
- Oceanographic and Atmospheric Processes
- Arctic and Antarctic ice dynamics
- Geological Studies and Exploration
- Coastal and Marine Management
- Marine Biology and Ecology Research
- earthquake and tectonic studies
- Climate variability and models
- International Maritime Law Issues
- Geological and Geophysical Studies
- Drilling and Well Engineering
- Reservoir Engineering and Simulation Methods
- Seismic Waves and Analysis
- Pleistocene-Era Hominins and Archaeology
- Hydrocarbon exploration and reservoir analysis
- Marine animal studies overview
- Nonlinear Optical Materials Research
- Marine and coastal ecosystems
Victoria University of Wellington
2011-2023
University of Papua New Guinea
2017
National Institute of Water and Atmospheric Research
2000-2014
University of New Mexico
2011
Morehouse School of Medicine
2011
University of Toronto
2004-2011
Northern Illinois University
2009
Indiana State University
2001
University of Cambridge
1995
Medical Research Institute of New Zealand
1975-1992
Abstract It is widely recognised that the acquisition of high‐resolution palaeoclimate records from southern mid‐latitude sites essential for establishing a coherent picture inter‐hemispheric climate change and better understanding role Antarctic dynamics in global system. New Zealand considered to be sensitive monitor because it one few sizeable landmasses Southern Hemisphere westerly circulation zone, critical transition zone between subtropical influences. has mountainous axial ranges...
The influence of Antarctica and the Southern Ocean on Late Pliocene global climate reconstructions has remained ambiguous due to a lack well-dated Antarctic-proximal, paleoenvironmental records. Here we present ice sheet, sea-surface temperature, sea from ANDRILL AND-1B sediment core recovered beneath Ross Ice Shelf. We provide evidence for major expansion an sheet in Sea that began at ∼3.3 Ma, followed by coastal surface temperature cooling ∼2.5 °C, stepwise ice, polynya-style deep mixing...
Research Article| November 01, 2009 The stratigraphic signature of the late Cenozoic Antarctic Ice Sheets in Ross Embayment Robert McKay; McKay † 1Antarctic Centre, Victoria University Wellington, P.O. Box 600, New Zealand †E-mail: robert.mckay@vuw.ac.nz. Search for other works by this author on: GSW Google Scholar Greg Browne; Browne 2GNS Science, 30368, Lower Hutt, Lionel Carter; Carter Ellen Cowan; Cowan 3Department Geology, Appalachian State University, Boone, North Carolina 28608-2067,...
It has been proposed that the ventilation of deep Pacific carbon pool was not significantly reduced during last glacial period, posing a problem for canonical theories glacial–interglacial CO2 change. However, using radiocarbon dates marine tephra deposited off New Zealand, we show deep- (>2000m) and shallow sub-surface ocean–atmosphere 14C age offsets (i.e. 'reservoir-' or 'ventilation' ages) in southwest increased by ∼1089 337 yrs respectively, reaching ∼2689 ∼1037 late glacial. A...
A series of cores from east New Zealand have been examined to determine the paleoceanographic history late Quaternary in SW Pacific using planktonic foraminiferal data. Distinct shifts species can be seen between glacial and interglacial times especially south Chatham Rise South Island. Foraminiferal fragmentation ratios benthic/planktonic both show increased dissolution during glacials, isotope stage 2 Rise. The present‐day Subtropical Convergence appears tied at 44°S, but this rise...
Campbell Plateau occupies a key position in the southwest Pacific sector of Southern Ocean. The plateau confines and steers Antarctic Circumpolar Current (ACC) along its flanks, isolating Subantarctic from cold polar waters. Oxygen carbon isotope records cores provide new water mass stratification for past 130 kyr. During glacial climes, strengthening Front (SAF) caused waters over flanks to be deeply mixed ∼3°C cooler. Waters interior remained stratified isolated southern In west, cooled...
Abstract Voluminous rhyolitic eruptions and prevailing westerly winds have dispersed late Quaternary ash from the Taupo Volcanic Zone (TVZ) of North Island, New Zealand, across Southwest Pacific Ocean. We identify (1850 14C years), Waimihia (3280 yr), Rerewhakaaitu (14 700 Kawakawa (22 590 yr) Tephra layers in deep ocean cores, mainly on basis their stratigraphic position, radiometric age, glass shard chemistry. Approximately 25 km3 were ENfE at least 650 km TVZ whereas c. 22 14 travelled...
Laser ablation inductively coupled plasma mass spectrometry was used to analyze the individual chambers from tests of foraminiferal fossil and plankton tow Globigerinoides ruber southwest Pacific Ocean, latitudes 3°S 42°S. The variability Mg/Ca between an (intraindividual) individuals same population (interindividual), is such that when converted temperature, extent intra‐individual interindividual appears exceed attributable either calcification or seasonal temperature variability. pooled...
Multibeam swath bathymetry data from the southwest margin of Chatham Rise, New Zealand, show gas release features over a region at least 20,000 km 2 . Gas escape features, interpreted to be caused by hydrate dissociation, include an estimated a) 10 8–11 in diameter and b) 1,000 1–5 diameter, both 800–1,100 m water depth. An 10,000 ∼150 are observed 500–700 In latter depth range sub‐bottom profiles similar (pockmarks) disconformities mark past sea‐level low stands. The amount methane...
ABSTRACT The stability of Antarctic ice sheets and their potential contribution to sea level under projected future warming remains highly uncertain. Last Interglacial (135 000–116 000 years ago) provides a analogue, with global temperatures 2 °C higher rates sea‐level rise >5.6 m ka −1 , leading levels 6.6–9.4 than present. source(s) this remain fiercely debated. Here we report series independent model simulations exploring the effects migrating Southern Hemisphere Westerlies (SHWs) on...
Abstract. High-resolution, well-dated climate archives provide an opportunity to investigate the dynamic interactions of patterns relevant for future projections. Here, we present data from a new, annually dated ice core record eastern Ross Sea, named Roosevelt Island Climate Evolution (RICE) core. Comparison this with reanalysis 1979–2012 interval shows that RICE reliably captures temperature and snow precipitation variability in region. Trends over past 2700 years are shown be distinct...