A5023856249- Geology and Paleoclimatology Research
- Cryospheric studies and observations
- Methane Hydrates and Related Phenomena
- Landslides and related hazards
- Geophysics and Gravity Measurements
- Winter Sports Injuries and Performance
- Climate change and permafrost
- Arctic and Antarctic ice dynamics
- Paleontology and Stratigraphy of Fossils
- Geological formations and processes
- Climate variability and models
- Pleistocene-Era Hominins and Archaeology
- Atmospheric and Environmental Gas Dynamics
- Geological Studies and Exploration
- Geological and Geophysical Studies
- Polar Research and Ecology
- Maritime and Coastal Archaeology
- Evolution and Paleontology Studies
- Archaeological and Geological Studies
- Marine and environmental studies
- Marine and coastal ecosystems
- Oceanographic and Atmospheric Processes
- Geological and Geochemical Analysis
- Aeolian processes and effects
- Isotope Analysis in Ecology
Vrije Universiteit Amsterdam
2019-2023
Association for Project Management
2022
Utrecht University
2009-2018
University of Leeds
2015-2018
Abstract This study investigates likely changes in mean and extreme precipitation over southern Africa response to radiative forcing using an ensemble of global climate models prepared for the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4). Extreme seasonal is defined terms 10-yr return levels obtained by inverting a generalized Pareto distribution fitted excesses above predefined high threshold. Both present (control) future extremes are estimated. The...
Abstract Variations in global ice volume and temperature over the Cenozoic era have been investigated with a set of one-dimensional (1-D) ice-sheet models. Simulations include three sheets representing glaciation Northern Hemisphere, i.e. Eurasia, North America Greenland, two separate for Antarctic glaciation. The continental mean Hemisphere surface-air has derived through an inverse procedure from observed benthic δ 18 O records. These data yielded mutually consistent continuous record...
Abstract. Relative sea-level variations during the late Pleistocene can only be reconstructed with knowledge of ice-sheet history. On other hand, regional and global relative is necessary to learn about changes in ice volume. Overcoming this problem circularity demands a fully coupled system where sheets sea level vary consistently space time dynamically affect each other. Here we present results for past 410 000 years (410 kyr) from coupling set 3-D ice-sheet-shelf models model, which based...
Abstract. The gradual cooling of the climate during Cenozoic has generally been attributed to a decrease in CO2 concentration atmosphere. lack transient models and, particular, high-resolution proxy records CO2, beyond ice-core record prohibit, however, full understanding of, for example, inception Northern Hemisphere glaciation and mid-Pleistocene transition. Here we elaborate on an inverse modelling technique reconstruct continuous series over past 20 million year (Myr), by decomposing...
Abstract The Milankovitch theory of climate change is widely accepted, but the registration changes in stratigraphic record and their use building high-resolution astronomically tuned timescales has been disputed due to complex fragmentary nature record. However, results time series analysis consistency with independent magnetobiostratigraphic and/or radio-isotopic age models show that cycles are recorded not only deep marine lacustrine successions, also ice cores speleothems, eolian fluvial...
Abstract. Stable isotope records of benthic foraminifera from ODP Site 1264 in the southeastern Atlantic Ocean are presented which resolve latest Oligocene to early Miocene (~24–19 Ma) climate changes at high temporal resolution (<3 kyr). Using an inverse modelling technique, we decomposed oxygen record into temperature and ice volume found that Antarctic sheet expanded episodically during declining phase long-term (~400 kyr) eccentricity cycle subsequent low short-term (~100 cycle. The...
Abstract. Understanding the evolution of, and interactions between, ice sheets global climate over geological timescales is important for being able to project their future evolution. However, direct observational evidence of past CO2 concentrations, implied radiative forcing, only exists 800 000 years. Records benthic δ18O date back millions years but contain signals from both land volume ocean temperature. In recent years, inverse forward modelling has been developed as a method...
Abstract. In the context of future climate change, understanding nature and behaviour ice sheets during warm intervals in Earth history is fundamental importance. The late Pliocene period (also known as PRISM interval: 3.264 to 3.025 million years before present) can serve a potential analogue for projected climates. Although locations extents are still poorly constrained, significant contribution sea-level rise should be expected from both Greenland sheet West East Antarctic based on palaeo...
The interaction between ice-sheet growth and retreat sea-level change has been an established field of research for many years. However, recent advances in numerical modelling have shed new light on the precise marine ice sheets with near-field sea level, related stability grounding line position. Studies using fully coupled – models shown that accounting gravitationally self-consistent will act to slow down advance lines. Moreover, by simultaneously solving 'sea-level equation' flow,...
Abstract. The understanding of the nature and behavior ice sheets in past warm periods is important for constraining potential impacts future climate change. Pliocene period (between 3.264 3.025 Ma) saw global temperatures similar to those projected climates; nevertheless, locations extents are still poorly constrained. We present results from efforts simulate mid-Pliocene Greenland Ice Sheets by means international Sheet Modeling Intercomparison Project (PLISMIP). compare performance...
Abstract. Fully coupled ice-sheet–climate modelling over 10 000–100 000-year timescales at high spatial and temporal resolution remains beyond the capability of current computational systems. Forcing an ice-sheet model with precalculated output from a general circulation (GCM) offers middle ground, balancing need to accurately capture both long-term processes, in particular circulation-driven changes precipitation, processes requiring like ablation. Here, we present evaluate set-up that...
Abstract. Estimating the contribution of marine ice sheets to sea-level rise is complicated by grounded below sea level that replaced ocean water when melted. The common approach only consider volume above floatation, defined as be removed from an column become afloat. With isostatic adjustment bedrock and external forcing not a result mass changes sheet under consideration, this breaks down, because floatation can modified without actual in contribution. We discuss consistent generalised...
Abstract. It is still an open question how equilibrium warming in response to increasing radiative forcing – the specific climate sensitivity S depends on background climate. We here present palaeodata-based evidence state dependency of S, by using CO2 proxy data together with a 3-D ice-sheet-model-based reconstruction land ice albedo over last 5 million years (Myr). find that non-linearly climate, while any non-linearity set used. This has not, so far, been accounted for similar approaches...
Abstract. Since the inception of Antarctic ice sheet at Eocene–Oligocene transition (∼ 34 Myr ago), land has played a crucial role in Earth's climate. Through feedbacks climate system, variability modifies atmospheric temperature changes induced by orbital, topographical, and greenhouse gas variations. Quantification these on long timescales hitherto scarcely been undertaken. In this study, we use zonally averaged energy balance model bidirectionally coupled to one-dimensional model,...
Abstract. In order to investigate the relation between ice sheets and climate in a warmer-than-present world, recent research has focussed on Late Pliocene, 3.6 2.58 million years ago. It is most period Earth's history when such warm state existed for significant duration of time. Marine Isotope Stage (MIS) M2 (∼3.3 Myr ago) strong positive excursion benthic oxygen records middle otherwise relatively stable Pliocene. However, relative contributions δ18O signal from deep ocean cooling growing...
Abstract The mid-Pliocene warm period provides a natural laboratory to investigate the long-term response of Earth’s ice-sheets and sea level in warmer-than-present-day world. Proxy data suggest that during Pliocene, portions Antarctic ice-sheets, including West Antarctica could have been lost. Ice-sheet modelling forced by Pliocene climate model outputs is an essential way improve our understanding Pliocene. However, uncertainty exists regarding degree which results are model-dependent....
Abstract. We present the effects of changing two sliding parameters, a deformational velocity parameter and bedrock deflection parameters on evolution Antarctic ice sheet over period from last interglacial until present. These sensitivity experiments have been conducted by running dynamic model ANICE forward in time. The temporal climatological forcing is established interpolating between climate states created with regional model. interpolation done such way that both temperature surface...
Abstract The Gulf of Cadiz constitutes a prime area to study teleconnections between the North Atlantic Ocean and climate change in Mediterranean realm. In particular, highly saline Outflow Water (MOW) is an important modulator salt budget on intermediate water levels. However, our understanding its paleoceanographic evolution poorly constrained due lack high‐resolution proxy records that predate last glacial cycle. Here we present first continuous (~ 1 kyr) benthic δ 18 O 13 C as well grain...