A5062093532- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- Climate change and permafrost
- Landslides and related hazards
- Polar Research and Ecology
- Winter Sports Injuries and Performance
- Pleistocene-Era Hominins and Archaeology
- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Geological Studies and Exploration
- High-pressure geophysics and materials
- Methane Hydrates and Related Phenomena
- Geological formations and processes
- Marine and environmental studies
- Geophysics and Gravity Measurements
- Hydrology and Watershed Management Studies
- Human Health and Disease
- Arctic and Antarctic ice dynamics
- Marine Biology and Ecology Research
- Climate variability and models
- Pregnancy and preeclampsia studies
- Geomagnetism and Paleomagnetism Studies
- Healthcare Systems and Public Health
- Hydrocarbon exploration and reservoir analysis
- Rangeland Management and Livestock Ecology
Norwegian University of Science and Technology
2019-2024
University of Concepción
2022-2024
Centro de Recursos Educativos Avanzados
2023-2024
University of Bremen
2015-2021
Saratov State Medical University
2015-2021
Schmidt Institute of Physics of the Earth
2008-2020
GFZ Helmholtz Centre for Geosciences
2006-2018
Ministry of Health of the Russian Federation
2018
University of Potsdam
2012-2016
Bolin Centre for Climate Research
2014
The timing of past glaciation across the Tian Shan provides a proxy for climate change in this critical area. Correlating glacial stages region is difficult but cosmogenic exposure ages have considerable potential. A drawback large observed scatter 10Be surface data. To quantify robustness dating, we compile, recalculate, and perform statistical analyses on sets from 25 moraines, consisting 114 new previously published ages. We assess boulder age by dividing groups into quality classes...
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...
Abstract. After more than a century of geological research, the Cordilleran ice sheet North America remains among least understood in terms its former extent, volume, and dynamics. Because mountainous topography on which formed, studies have often had only local or regional relevance shown such complexity that ice-sheet-wide spatial reconstructions advance retreat patterns are lacking. Here we use numerical model calibrated against field-based evidence to attempt quantitative reconstruction...
This study analyzes the uncertainties in models of Greenland Ice Sheet (GIS) that arise from ill‐constrained geothermal heat flux (GHF) distribution. Within context dynamic GIS modeling, we consider following questions: (i) What is significance differences between existing GHF for modeling studies? (ii) How well does modeled controlled by agree with observational data? (iii) are relative contributions and climate forcing to misfit observed present‐day GIS? The results paleoclimatic...
[1] In this study, the memory of Greenland Ice Sheet (GIS) with respect to its past states is analyzed. According ice core reconstructions, present-day GIS reflects former climatic conditions dating back at least 250 thousand years before present (kyr BP). This fact must be considered when initializing an sheet model. The common initialization techniques are paleoclimatic simulations driven by atmospheric forcing inferred from records and steady state or conditions. When used, information...
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Abstract. The shallow ice approximation (SIA) is commonly used in ice-sheet models to simplify the force balance equations within ice. However, SIA cannot adequately reproduce dynamics of fast flowing streams usually found at margins sheets. To overcome this limitation, recent studies have introduced heuristic hybrid combinations and shelfy stream approximation. Here, we implement four different schemes into a model Antarctic Ice Sheet order compare their performance under present-day...
Abstract. The orientation and tectonic regime of the observed crustal/lithospheric stress field contribute to our knowledge different deformation processes occurring within Earth's crust lithosphere. In this study, we analyze influence thermal density structure upper mantle on lithospheric topography. We use a 3-D lithosphere–asthenosphere numerical model with power-law rheology, coupled spectral flow code at 300 km depth. Our results are validated against World Stress Map 2016 (WSM2016)...
ABSTRACT Ice-shelf basal melting is the largest contributor to negative mass balance of Antarctic ice sheet. However, current implementations ice/ocean interactions in ice-sheet models disagree with distribution sub-shelf melt and freezing rates revealed by recent observational studies. Here we present a novel combination continental-scale flow model calibration technique derive spatial for whole ice-shelf system. The modelled equilibrium state evaluated against topographic velocity...
Abstract. We present an ensemble of numerical simulations the Cordilleran ice sheet during Last Glacial Maximum performed with Parallel Ice Sheet Model (PISM), applying temperature offsets to present-day climatologies from five different data sets. Monthly mean surface air and precipitation WorldClim, NCEP/NCAR reanalysis, ERA-Interim Climate Forecast System Reanalysis North American Regional are used compute mass balance in a positive degree-day model. Modelled outlines volumes appear...
Abstract Lithospheric plates move over the low‐viscosity asthenosphere balancing several forces, which generate plate motions. We use a global 3‐D lithosphere‐asthenosphere model (SLIM3D) with visco‐elasto‐plastic rheology coupled to spectral of mantle flow at 300 km depth quantify influence intra‐plate friction and asthenospheric viscosity on velocities. account for brittle‐ductile deformation boundaries (yield stress) using boundary coefficient predict present‐day motion net rotation...
Historical climate data indicate that the Earth has passed through multiple geological periods with much warmer-than-present climates, including epochs of Miocene (23-5.3 mya BP) temperatures 3-4°C above present, and more recent interglacial stages Quaternary, for example, Marine Isotope Stage 11c (approx. 425-395 ka Middle Holocene thermal maximum (7.5-4.2 BP), during which continental glaciers may have melted entirely. Such warm would severe consequences ice-obligate fauna in terms their...
Abstract. This study aims to demonstrate that the spatial and seasonal effects of daily temperature variability in positive degree-day (PDD) models play a decisive role shaping modeled surface mass balance (SMB) continental-scale ice masses. Here we derive monthly fields standard deviation (SD) across Greenland from ERA-40 (European Centre for Medium-Range Weather Forecasts 40 yr Reanalysis) reanalysis spanning 1958 2001 apply these model recent responses Ice Sheet (GIS). Neither climate...
Abstract. Numerical models predict that discharge from the polar ice sheets will become largest contributor to sea-level rise over coming centuries. However, predicted amount of and associated thinning depends on how well sheet reproduce glaciological processes, such as flow in regions large topographic relief, where flows around bedrock summits (i.e. nunataks) through outlet glaciers. The ability capture long-term loss is best tested by comparing model simulations against geological data. A...
Abstract The East Antarctic Ice Sheet stores a vast amount of freshwater, which makes it the single largest potential contributor to future sea-level rise. However, lack well-constrained geological records past ice sheet changes impedes model validation, hampers mass balance estimates, and inhibits examination loss mechanisms. Here we identify rapid ice-sheet thinning in coastal Dronning Maud Land from Early Middle Holocene (9000–5000 years ago) using deglacial chronology based on situ...
The observed geoid, dynamic topography, and surface plate velocities are controlled by various factors such as density viscosity variations in the Earth's mantle strength of lithosphere. Previous studies have shown that geoid signal cannot be resolved details within framework a simplified model flow considering only radial variations. Thus, modeling technique handling both lateral other parameters should used. spectral method provides high‐accuracy semianalytical solution Navier‐Stokes...
Abstract. Studying the response of Antarctic ice sheets during periods when climate conditions were similar to present can provide important insights into current observed changes and help identify natural drivers sheet retreat. In this context, marine isotope substage 11c (MIS11c) interglacial offers a suitable scenario, given that its later portion orbital parameters close our interglacial. Ice core data indicate warmer-than-present temperatures lasted for longer than other interglacials....
Abstract. Despite more than a century of geological observations, the Cordilleran ice sheet North America remains poorly understood in terms its former extent, volume and dynamics. Although geomorphological evidence is abundant, complexity such that whole ice-sheet reconstructions advance retreat patterns are lacking. Here we use numerical model calibrated against field-based to attempt quantitative reconstruction history through last glacial cycle. A series simulations driven by...
Abstract. Climate change in Siberia is currently receiving a lot of attention because large permafrost-covered areas could provide strong positive feedback to global warming through the release carbon that has been sequestered there on glacial–interglacial timescales. Geological evidence and climate model experiments show Siberian region also played an exceptional role during glacial periods. The known for its harsh cold did not experience major glaciations last ice age, including severest...