A5062331469- Cryospheric studies and observations
- Climate change and permafrost
- Arctic and Antarctic ice dynamics
- Winter Sports Injuries and Performance
- Landslides and related hazards
- Climate variability and models
- Geology and Paleoclimatology Research
- Hydrology and Watershed Management Studies
- Meteorological Phenomena and Simulations
- Geophysics and Gravity Measurements
- Polar Research and Ecology
- Methane Hydrates and Related Phenomena
- Geological Studies and Exploration
- Environmental and Cultural Studies in Latin America and Beyond
- Tree-ring climate responses
- Science and Climate Studies
- Atmospheric and Environmental Gas Dynamics
- Plant Water Relations and Carbon Dynamics
- Urban Heat Island Mitigation
- Peatlands and Wetlands Ecology
- Soil Geostatistics and Mapping
- Geological Modeling and Analysis
- Coastal and Marine Management
- Geographic Information Systems Studies
- Chemical and Physical Studies
University of Alaska Fairbanks
2016-2025
University of Oslo
2020-2025
Carnegie Mellon University
2024
Northwest Institute of Eco-Environment and Resources
2024
Chinese Academy of Sciences
2024
Uppsala University
2011-2022
Miriam (Norway)
2022
University of Alaska System
2013
Geophysical Laboratory
2011
Stockholm University
2001-2006
Glaciers distinct from the Greenland and Antarctic Ice Sheets are losing large amounts of water to world's oceans. However, estimates their contribution sea level rise disagree. We provide a consensus estimate by standardizing existing, creating new, mass-budget satellite gravimetry altimetry local glaciological records. In many regions, measurements more negative than satellite-based estimates. All regions lost mass during 2003-2009, with largest losses Arctic Canada, Alaska, coastal...
Abstract The Randolph Glacier Inventory (RGI) is a globally complete collection of digital outlines glaciers, excluding the ice sheets, developed to meet needs Fifth Assessment Intergovernmental Panel on Climate Change for estimates past and future mass balance. RGI was created with limited resources in short period. Priority given completeness coverage, but limited, uniform set attributes attached each ~198 000 glaciers its latest version, 3.2. Satellite imagery from 1999–2010 provided most...
The anticipated retreat of glaciers around the globe will pose far-reaching challenges to management fresh water resources and significantly contribute sea-level rise within coming decades. Here, we present a new model for calculating 21st century mass changes all on Earth outside ice sheets. Global Glacier Evolution Model (GloGEM) includes loss due frontal ablation at marine-terminating glacier fronts accounts advance/retreat surface Elevation changes. Simulations are driven with monthly...
Abstract Hourly melt and discharge of Storglaciären, a small glacier in Sweden, were computed for two seasons, applying temperature-index methods to 30 m resolution grid the component. The classical degree-day method yielded good simulation seasonal patient discharge, but pronounced melt-induced daily cycles not captured. Modelled factors calculated every hour each gridcell from obtained distributed energy-balance model varied substantially, both diurnally spatially. A new is suggested,...
Abstract Hourly melt and discharge of Storglaciären, a small glacier in Sweden, were computed for two seasons, applying temperature-index methods to 30 m resolution grid the component. The classical degree-day method yielded good simulation seasonal patient discharge, but pronounced melt-induced daily cycles not captured. Modelled factors calculated every hour each gridcell from obtained distributed energy-balance model varied substantially, both diurnally spatially. A new is suggested,...
The Greenland Ice Sheet holds 7.2 m of sea level equivalent and in recent decades, rising temperatures have led to accelerated mass loss. Current ice margin recession is by the retreat outlet glaciers, large rivers ending narrow fjords that drain interior. We pair an glacier-resolving sheet model with a comprehensive uncertainty quantification estimate Greenland's contribution over next millennium. find could contribute 5 33 cm 2100, discharge from glaciers contributing 8 45% total Our...
Glacier mass loss affects sea level rise, water resources, and natural hazards. We present global glacier projections, excluding the ice sheets, for shared socioeconomic pathways calibrated with data each glacier. Glaciers are projected to lose 26 ± 6% (+1.5°C) 41 11% (+4°C) of their by 2100, relative 2015, temperature change scenarios. This corresponds 90 154 44 millimeters equivalent will cause 49 9 83 7% glaciers disappear. Mass is linearly related increase thus reductions in reduce loss....
Very few global‐scale ice volume estimates are available for mountain glaciers and caps, although such crucial any attempts to project their contribution sea level rise in the future. We present a statistical method deriving regional global volumes from glacier area distributions scaling using data ∼123,000 recently extended World Glacier Inventory. compute equivalent (SLE) 19 glacierized regions containing all caps on Earth. On basis of total 741 × 10 3 ± 68 km 2 , we estimate 241 29...
ABSTRACT Global-scale 21st-century glacier mass change projections from six published global models are systematically compared as part of the Glacier Model Intercomparison Project. In total 214 annual and area forced by 25 General Circulation Models (GCMs) four Representative Concentration Pathways (RCP) emission scenarios aggregated into 19 regions considered. Global loss all glaciers (outside Antarctic Greenland ice sheets) 2100 relative to 2015 averaged over model runs varies 18 ± 7%...
Abstract The hydrology of many important river systems in the world is influenced by presence glaciers their upper reaches. We assess global‐scale response glacier runoff to climate change, where defined as all melt and rain water that runs off glacierized area without refreezing. With an elevation‐dependent mass balance model, we project monthly for mountain ice caps outside Antarctica until 2100 using temperature precipitation scenarios from 14 global models. aggregate results 18 regions....
Glaciers in High Mountain Asia are an important freshwater resource for large populations living downstream who rely on runoff hydropower, irrigation, and municipal use. Projections of glacier mass change therefore have socio-economic impacts. In this study, we use a new dataset geodetic balance observations almost all glaciers the region to calibrate Python Glacier Evolution Model (PyGEM) using Bayesian inference. The enables model capture spatial variations inference uncertainty associated...
Abstract Glacier mass loss is recognized as a major contributor to current sea level rise. However, large uncertainties remain in projections of glacier on global and regional scales. We present an ensemble 288 area change for the 21st century based 11 models using up 10 general circulation four Representative Concentration Pathways (RCPs) boundary conditions. partition total uncertainty into individual contributions caused by models, RCPs, natural variability. find that emission scenario...
Supraglacial debris affects glacier mass balance as a thin layer enhances surface melting, while thick reduces it. While many glaciers are debris-covered, global models do not account for because its thickness is unknown. We provide the first globally distributed estimates using novel approach combining sub-debris melt and temperature inversion methods. Results evaluated against observations from 22 glaciers. find median ∼0.15 ± 0.06 m. In all regions, net effect of accounting reduction in...
Abstract A grid-based surface energy-balance mass-balance model has been developed to simulate snow- and ice melt in mountainous regions with an hourly resolution. The is applied Storglaciären, a valley glacier Sweden, using 30 m resolution digital elevation model. Emphasis directed towards computing the radiation components. These are modelled individually, considering effects of slope angle, aspect effective horizon. new parameterization for snow albedo suggested, modifying preceding hour...
Alpine glaciers have suffered major losses of ice in the last century. We compute spatially distributed seasonal mass balances four Swiss Alps (Grosser Aletschgletscher, Rhonegletscher, Griesgletscher and Silvrettagletscher) for period 1865 to 2006. The balance model is forced by daily air temperature precipitation data compiled from various long‐term series. calibrated using volume changes derived five nine high‐resolution digital elevation models, annual discharge a newly set more than...