A5019549213- Geology and Paleoclimatology Research
- Cryospheric studies and observations
- Climate variability and models
- Meteorological Phenomena and Simulations
- Methane Hydrates and Related Phenomena
- Oceanographic and Atmospheric Processes
- Climate change and permafrost
- Geophysics and Gravity Measurements
- Scientific Computing and Data Management
- Distributed and Parallel Computing Systems
- Winter Sports Injuries and Performance
- Landslides and related hazards
- Atmospheric and Environmental Gas Dynamics
- Tropical and Extratropical Cyclones Research
- Geological Studies and Exploration
- Arctic and Antarctic ice dynamics
- Radiomics and Machine Learning in Medical Imaging
- Earthquake Detection and Analysis
- Marine and coastal ecosystems
- Simulation Techniques and Applications
- Ionosphere and magnetosphere dynamics
- Atmospheric aerosols and clouds
- Seismic Waves and Analysis
- Astro and Planetary Science
- Atmospheric chemistry and aerosols
German Climate Computing Centre
2020-2025
Max Planck Institute for Meteorology
2012-2024
German Meteorological Service
2022
Helmholtz-Zentrum Hereon
2022
Max Planck Society
2010-2021
Universität Hamburg
2018
University of Alaska Fairbanks
2014-2016
Danish Meteorological Institute
2014
Max Planck Institute for Comparative and International Private Law
2014
Abstract. Observations and models agree that the Greenland Ice Sheet (GrIS) surface mass balance (SMB) has decreased since end of 1990s due to an increase in meltwater runoff this trend will accelerate future. However, large uncertainties remain, partly different approaches for modelling GrIS SMB, which have weigh physical complexity or low computing time, spatial temporal resolutions, forcing fields, ice sheet topographies extents, collectively make inter-comparison difficult. Our SMB model...
Abstract This work documents the ICON‐Earth System Model (ICON‐ESM V1.0), first coupled model based on ICON (ICOsahedral Non‐hydrostatic) framework with its unstructured, icosahedral grid concept. The ICON‐A atmosphere uses a nonhydrostatic dynamical core and ocean ICON‐O builds same infrastructure, but applies Boussinesq hydrostatic approximation includes sea‐ice model. ICON‐Land module provides new for modeling of land processes terrestrial carbon cycle. oceanic cycle biogeochemistry are...
Abstract. State-of-the-art Earth system models typically employ grid spacings of O(100 km), which is too coarse to explicitly resolve main drivers the flow energy and matter across system. In this paper, we present new ICON-Sapphire model configuration, targets a representation components their interactions with spacing 10 km finer. Through use selected simulation examples, demonstrate that can (i) be run coupled globally on seasonal timescales 5 km, monthly 2.5 daily 1.25 km; (ii) large...
Abstract The last deglaciation was characterized by drastic climate changes, most prominently melting ice sheets. Melting sheets have a significant impact on the atmospheric and oceanic circulation, due to changes in topography meltwater release into ocean. In set of transient simulations with Max Planck Institute for Meteorology Earth System Model we explore differences response that arise from different boundary conditions implementations suggested within Paleoclimate Modeling...
Abstract. We report on the first multi-year kilometre-scale global coupled simulations using ECMWF's Integrated Forecasting System (IFS) to both NEMO and FESOM ocean–sea ice models, as part of H2020 Next Generation Earth Modelling Systems (nextGEMS) project. focus mainly an unprecedented IFS-FESOM setup, with atmospheric resolution 4.4 km a spatially varying ocean that reaches locally below 5 grid spacing. A shorter simulation 2.8 has also been performed. number shortcomings in original...
Abstract. Earlier large-scale Greenland ice sheet sea-level projections (e.g. those run during the ice2sea and SeaRISE initiatives) have shown that initial conditions a large effect on give rise to important uncertainties. The goal of this initMIP-Greenland intercomparison exercise is compare, evaluate, improve initialisation techniques used in modelling community estimate associated uncertainties modelled mass changes. first series model activities within ISMIP6 (the Ice Sheet Model...
Recent progress in computing and model development has initiated the era of global storm-resolving modeling, with it potential to transform weather climate prediction. Within general theme vetting this new class models, present study evaluates nine global-storm resolving models their ability simulate tropical cyclones (TCs). Results indicate that, broadly speaking, produce realistic TCs remove longstanding issues known from such as deficiency accurately simulating TC intensity. However, are...
Abstract. We report on the first multi-year km-scale global coupled simulations using ECMWF’s Integrated Forecasting System (IFS) to both NEMO and FESOM ocean-sea ice models, as part of Horizon 2020 Next Generation Earth Modelling Systems (nextGEMS) project. focus mainly two unprecedented IFS-FESOM setups, with an atmospheric resolution 2.8 km 4.4 km, respectively, same spatially varying ocean that reaches locally below 5 grid-spacing. This is enabled by a refactored model code allows for...
Abstract Recent observations indicate a high sensitivity of the Greenland Ice Sheet (GrIS) to climate change. We examine coupling between GrIS surface mass balance, elevation, and dynamical flow with one few coupled atmosphere‐ocean general circulation models. Bidirectional from early Holocene reveals growing present‐day in absence anthropogenic forcing. identify atmospheric sources biases simulated assess future greenhouse gas forcing through three Representative Concentration Pathways...
Abstract. Heinrich events are among the dominant modes of glacial climate variability. During these events, massive iceberg armadas were released by Laurentide Ice Sheet and sailed across Atlantic where they melted freshwater, as well detritus, that formed characteristic layers on seafloor. known for cold climates in North region global changes. We study a fully coupled complex ice sheet–climate model with synchronous coupling between sheets oceans. The discharges occur an internal...
Abstract. The Greenland Ice Sheet (GrIS) mass loss has been accelerating at a rate of about 20 ± 10 Gt/yr2 since the end 1990's, with around 60 % this directly attributed to enhanced surface meltwater runoff. However, in climate and glaciology communities, different approaches exist on how model balance (SMB) components using: (1) complex physically-based models which are computationally expensive; (2) intermediate complexity energy models; (3) simple fast positive degree day base their...
ABSTRACT We study the evolution of Juneau Icefield, one largest icefields in North America (>3700 km 2 ), using Parallel Ice Sheet Model (PISM). test two climate datasets: 20 Weather Research and Forecasting (WRF) output, data from Scenarios Network for Alaska Planning (SNAP), derived spatial interpolation observations. Good agreement between simulated observed surface mass balance was achieved only after substantially adjusting WRF precipitation to account unresolved orographic effects,...
Abstract. State-of-the-art Earth System models typically employ grid spacings of O(100 km), too coarse to explicitly resolve main drivers the flow energy and matter across System. In this paper, we present new ICON-Sapphire model configuration, which targets a representation components their interactions with spacing 10 km finer. Through use selected simulation examples, demonstrate that can already now (i) be run coupled globally on seasonal time scales 5 monthly 2.5 km, (ii) large eddies...
Abstract. The Next Generation of Earth Modeling Systems (nextGEMS) project aimed to produce multi-decadal climate simulations, for the first time, with resolved kilometer-scale (km-scale) processes in ocean, land, and atmosphere. In only three years, nextGEMS achieved this milestone two km-scale system models, ICOsahedral Non-hydrostatic model (ICON) Integrated Forecasting System coupled Finite-volumE Sea ice-Ocean Model (IFS-FESOM). was based on cornerstones: 1) developing models small...
Currently certain earth system models, due to their advanced modeling capabilities and improved computational power, can perform simulations at extremely high resolutions as close a km. The data from these act drivers for many downstream scientific research applications well decision making tools that aid in policy making. These turn depend on shared or standalone resources HPC infrastructures. As result the federated access design is required revolve around triad comprising of: Data...
During the last 20,000 years, climate of Earth evolved from a state much colder than today with large ice sheets covering North America and Northwest Eurasia to its present state. The fully-interactive simulation this transition represented hitherto unsolved challenge for state-of-the-art models. We use novel coupled comprehensive atmosphere-ocean-vegetation-ice sheet-solid earth model simulate transient evolution, referred as deglaciation. considers dynamical changes (shape extent) well in...
Abstract. In the standard Paleoclimate Modelling Intercomparison Project (PMIP) experiments, Last Glacial Maximum (LGM) is modeled in quasi-equilibrium with atmosphere–ocean–vegetation general circulation models (AOVGCMs) prescribed ice sheets. This can lead to inconsistencies between climate and One way avoid this problem would be model sheets explicitly. Here, we present first results from coupled sheet–climate simulations for pre-industrial times LGM. Our setup consists of AOVGCM...
Abstract. A realistic simulation of the surface mass balance (SMB) is essential for simulating past and future ice-sheet changes. As most state-of-the-art Earth system models (ESMs) are not capable realistically representing processes determining SMB, studies SMB limited to observations regional climate cover last century near only. Using transient simulations with Max Planck Institute ESM in combination an energy model (EBM), we extend previous research study changes equilibrium line...
Abstract. Heinrich-type ice-sheet surges are one of the prominent signals glacial climate variability. They characterised as abrupt, quasi-periodic episodes instabilities during which large numbers icebergs released from Laurentide ice sheet. The mechanisms controlling timing and occurrence remain poorly constrained to this day. Here, we use a coupled sheet–solid Earth model identify quantify importance boundary forcing for surge cycle length two streams sheet – land-terminating Mackenzie...
Eleven 40-day long integrations of five different global models with horizontal resolutions less than 9 km are compared in terms their energy spectra. The method normal-mode function decomposition is used to distinguish between balanced (Rossby wave; RW) and unbalanced (inertia-gravity IGW) circulation. simulations produce the expected canonical shape spectra, but spectral slopes at mesoscales, zonal scale which RW IGW spectra intersect differ significantly. partitioning total wave energies...
Abstract. To enhance understanding of Earth's climate, numerical experiments are performed contrasting a retrograde and prograde rotating Earth using the Max Planck Institute system model. The show that sense rotation has relatively little impact on globally zonally averaged energy budgets but leads to large shifts in continental climates, patterns precipitation, regions deep water formation. Changes zonal asymmetries climates expected given ideas developed more than hundred years ago....
Participants of the Berlin Summit on Earth Virtualization Engines (EVEs) discussed ideas and concepts to improve our ability cope with climate change. EVEs aim provide interactive accessible simulations data for a wide range users. They combine high-resolution physics-based models machine learning techniques fidelity, efficiency, interpretability projections. At its core, offer federated layer that enables simple fast access exabyte-sized through interfaces. In this article, we summarize...
Abstract The evolution of the northern hemispheric climate during last glacial period was beset by quasi-episodic iceberg discharge events from Laurentide ice sheet, known as Heinrich (HEs). paleo record places most HEs into cold stadial Dansgaard-Oeschger cycle. However, not every cycle is associated with a HE, revealing complex interplay between two modes variability. Here, using coupled sheet-solid earth model, we introduce mechanism that explains synchronicity and cycles. Unlike earlier...
Abstract. During the last 20,000 years climate of earth has changed from a state much colder than today with large ice sheets in North America and Northwest Eurasia to its present state. The fully-interactive simulation this transition represents hitherto unsolved challenge for state-of-the-art models. We use novel coupled comprehensive atmosphere–ocean–vegetation– sheet–solid model simulate transient evolution glacial maximum preindustrial times. considers dynamical changes glacier mask,...
Using Doppler radar technology we are able to show that eruptions at Santiaguito volcano, Guatemala, comprised of multiple explosive degassing pulses occurring a frequency 0.2 0.3 Hz. The system was installed about 2.7 km away from the active dome on top Santa Maria volcano. During four days continuous measurement 157 eruptive events were recorded. data reveals vertical uplift surface 50 cm immediately prior first pulse. Particle velocities range 10 15 m/s (in line sight radar). In 80%...