A5090242188- Climate change and permafrost
- Cryospheric studies and observations
- Arctic and Antarctic ice dynamics
- Geology and Paleoclimatology Research
- Geological Studies and Exploration
- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Atmospheric aerosols and clouds
- Methane Hydrates and Related Phenomena
- Peatlands and Wetlands Ecology
- Geological Modeling and Analysis
- Hydrology and Watershed Management Studies
- Smart Materials for Construction
- Indigenous Studies and Ecology
- Hydrology and Sediment Transport Processes
- Soil erosion and sediment transport
University of Oslo
2023
University of Alaska Fairbanks
2019-2023
NORCE Norwegian Research Centre
2023
Melnikov Permafrost Institute of the Siberian Branch of the Russian Academy of Science
2013
Abstract High-latitude and altitude cold regions are affected by climate warming permafrost degradation. One of the major concerns associated with degrading is thaw subsidence due to melting excess ground ice consolidation. Field observations, remote sensing, numerical modeling used measure estimate extent rates across broad spatial temporal scales. Our new data synthesis effort from diverse North America Eurasia, confirms widespread panarctic domain up 2 cm/yr in areas low content more than...
Abstract. Aerosol–cloud interactions (ACIs) are a leading source of uncertainty in estimates the historical effective radiative forcing (ERF). One reason for this is difficulty estimating ERF from aerosol–cloud (ERFaci) climate models, which typically requires multiple calls to radiation code. Most commonly used methods also cannot disentangle contributions different processes ERFaci. Here, we develop new, computationally efficient method shortwave (SW) ERFaci liquid clouds using histograms...
Changes in cloud scattering properties and emissivity that arise from atmospheric warming cause substantial radiative feedbacks model projections of anthropogenic climate change, the relative importance underlying mechanisms is poorly understood. One leading hypothesis ice-to-liquid conversions clouds to optically thicken, producing a major negative feedback. We test this by developing method decompose cloud-top phase. The applied an ensemble six state-of-the-art global models run with...
Understanding and accurately representing ecological processes between land reservoirs the atmosphere is crucial for predicting climate responses. However, terrestrial carbon cycle in Earth system models remains a source of uncertainty. Particularly boreal soils, which store large amounts organic matter, are an important player global cycle, therefore key component models. Recent advancements, such as microbial-explicit models, have improved modeling cycling soil decomposition...
Permafrost hydrology is an emerging discipline, attracting increasing attention as the Arctic region undergoing rapid change. However, research domain of this discipline had never been explicitly formulated. Both ‘permafrost’ and ‘hydrology’ yield differing meanings across languages scientific domains; hence, ‘permafrost hydrology’ serves example cognitive linguistic relativity. From point view, English Russian usages term are explained. The views permafrost either ecosystem class or a...
Abstract Permafrost, a key component of Arctic ecosystems, is currently affected by climate warming and anticipated to undergo further significant changes in this century. The most pronounced are expected occur the transition zone between discontinuous continuous types permafrost. We apply transient temperature dynamic model investigate spatiotemporal evolution permafrost conditions on Seward Peninsula, Alaska—a region characterized its northern part south. calibrate parameters using...
Abstract Global permafrost regions are undergoing significant changes due to global warming, whose assessments often rely on extent estimates derived from climate model simulations. These employ a range of definitions for the presence permafrost, leading inconsistencies in calculation area. Here, we present area calculations using 10 different detecting based either ground thermodynamics, soil hydrology, or air–ground coupling an ensemble 32 Earth system models. We find that variations...
Abstract Observations show increases in river discharge to the Arctic Ocean especially winter over last decades but physical mechanisms driving these changes are not yet fully understood. We hypothesize that even absence of a precipitation increase, permafrost degradation alone can lead increased annual runoff. To test this hypothesis we perform 12 millennium-long simulations an idealized hypothetical watershed (1 km 2 ) using distributed, physically based water balance model (Water flow and...
Abstract. Aerosol-cloud interactions (ACI) are a leading source of uncertainty in estimates the historical effective radiative forcing (ERF). One reason for this is difficulty estimating ERF from aerosol-cloud (ERFaci) climate models, which typically requires multiple calls to radiation code and cannot disentangle contributions different process ERFaci. Here, we develop new, computationally efficient method shortwave (SW) ERFaci liquid clouds using histograms monthly-averaged cloud fraction...
Glacier melt water is a critical fresh contribution of stream discharge for many regions and in high latitudes glacier extent decreasing with climate warming. However, characteristics glacierized contributions to subarctic watershed-scale geochemistry runoff have attracted limited attention. Tracer studies dominated watersheds are also commonly few days. We conducted six-year geochemical hydrograph separation study season daily streamflow watershed Interior Alaska estimate glacier, rain,...
Observed increases in runoff permafrost regions have not only been associated with changes air temperature and precipitation but also hydrological pathways caused by thaw, however, the causes detailed processes are still a matter of debate. In this study, we apply physically-based model WaSIM to idealized small watersheds assess response total its components surface runoff, interflow, baseflow atmospheric warming. We use an warming scenario defined steady (only winter) over 100 years...
Permafrost hydrology is an emerging discipline, attracting increasing attention as the Arctic region undergoing rapid change. However, research domain of this discipline had never been explicitly formulated. Both 'permafrost' and 'hydrology' yield differing meanings across languages scientific domains, hence 'permafrost hydrology' serves example linguistic relativity. The views permafrost either ecosystem class or a geographical region, concerned with landscapes generic water bodies,...