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Introduction
Tim van Peer is a Senior Petrophysicist / IODP Research Fellow at the University of Leicester. Tim investigates the interplay between the Antarctic ice sheet and ocean circulation, primarily using geophysical and geochemical techniques on sediments recovered during the International Ocean Discovery Program and its predecessors. Tim has been actively involved with IODP Expeditions 342 (Newfoundland drifts) and 374 (Ross Sea).
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Publications (27)
Earth’s obliquity and eccentricity cycles are strongly imprinted on Earth’s climate and widely used to measure geological time. However, the record of these imprints on the oxygen isotope record in deep-sea benthic foraminifera (δ¹⁸Ob) shows contradictory signals that violate isotopic principles and cause controversy over climate-ice sheet interact...
Through the Cenozoic (66–0 Ma), the dominant mode of ocean surface circulation in the Southern Ocean transitioned from two large subpolar gyres to circumpolar circulation with a strong Antarctic Circumpolar Current (ACC) and complex ocean frontal system. Recent investigations in the southern Indian and Pacific oceans show warm Oligocene surface wat...
Drill cores from the Antarctic continental shelf are essential for directly constraining changes in past Antarctic Ice Sheet extent. Here, we provide a sedimentary facies analysis of drill cores from International Ocean Discovery Program (IODP) Site U1521 in the Ross Sea, which reveals a unique, detailed snapshot of Antarctic Ice Sheet evolution be...
Variations in Earth’s orbit pace global ice-volume/sea-level changes, but the variability in the response for different sectors of the Antarctic Ice Sheet (AIS) to orbitally-forced climate change remains unclear. We present geological records of iceberg-rafted debris (IBRD) and other proxies from locations adjacent to the West Antarctic Ice Sheet (...
The role played by ocean circulation in major transitions in Earth's climate is debated. Here, we investigate the physical evolution of the Deep Western Boundary Current (DWBC) in the western North Atlantic Ocean through the late Eocene‐to‐mid Oligocene (35−26 Ma) using terrigenous grain size and geochemistry records of marine sediment cores. Our r...
International Ocean Discovery Program (IODP) Expedition 379 to the Amundsen Sea margin of West Antarctica recovered drill cores at two sites spanning the Latest Miocene–Holocene interval with the aim of reconstructing past West Antarctic Ice Sheet dynamics. The recovered Plio-/Pleistocene sediment sequences offer an opportunity to apply and test di...
The late Oligocene (~27.8–23 My ago) offers an opportunity to study past climate variability under high-CO2, warmer-than-present and the unipolar (Antarctic) glaciated state. Here, we present new high-resolution geochemical records from exquisitely well-preserved benthic foraminifera for the late Oligocene, an interval for which Antarctic ice-sheet...
The late Oligocene (~27.8–23 My ago) offers an opportunity to study past climate variability under high CO2 warmer-than-present conditions with Antarctic-only ice sheets (AIS) involved. Here, we present new high-resolution geochemical records from exquisitely well-preserved benthic foraminifera recovered from the northwestern Atlantic Ocean for the...
Early to Middle Miocene sea-level oscillations of approximately 40–60 m estimated from far-field records1,2,3 are interpreted to reflect the loss of virtually all East Antarctic ice during peak warmth². This contrasts with ice-sheet model experiments suggesting most terrestrial ice in East Antarctica was retained even during the warmest intervals o...
Hydrogenetic ferromanganese crusts are considered a faithful record of the isotopic composition of seawater influenced by weathering processes of continental masses. Given their ubiquitous presence in all oceans of the planet at depths of 400-7000 meters, they form one of the most well-distributed and accessible records of water-mass mixing and cli...
The marine-based West Antarctic Ice Sheet (WAIS) is currently retreating due to shifting wind-driven oceanic currents that transport warm waters toward the ice margin, resulting in ice shelf thinning and accelerated mass loss of the WAIS. Previous results from geologic drilling on Antarctica's continental margins show significant variability in mar...
The Antarctic ice sheet oscillated between nearly deglaciated and near-‐modern proportions, sometimes within ~110 kyr, during transient glacial phases of the Oligocene-‐Miocene icehouse world (5.33-‐33.9 Ma). Ice sheet hysteresis is closely coupled with carbon-‐cycle feedback mechanisms that are strongly affected by ocean circulation. However,...
Fine-grained magnetic particles in deep-sea sediments often statistically align with the ambient magnetic field during (and shortly after) deposition and can therefore record geomagnetic reversals. Correlation of these reversals to a geomagnetic polarity time scale is an important geochronological tool that facilitates precise stratigraphic correla...
Integrated Ocean Drilling Program (IODP) Expedition 342 recovered exceptional Paleogene to early Neogene sedimentary archives from clay-rich sediments in the northwest Atlantic Ocean. These archives present an opportunity to study Cenozoic climate in a highly sensitive region at often unprecedented resolution. Such studies require continuous record...
The Oligocene epoch represents a somewhat neglected chapter in paleoclimate and paleoceanographic history, which is at least partially due to the scarcity of complete Oligocene sedimentary archives and poor biostratigraphic age control. Many of the biotic events registered in Oligocene microfossils are strongly diachronous across latitudes as a res...
Submarine landslides represent one of the most hazardous geological events to impact North European margins. Whilst infrequent, ancient events have generated large tsunamis, a repeat of which today would cause significant damage. A sediment piston core suite collected in 2014 from the Aegir Ridge contains a record of two turbidites sourced from ver...
